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  • Articles  (10,810)
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  • Amino Acid Sequence
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  • Articles  (10,810)
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  • 2020-2022
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  • 1
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    An antigen produced by splicing of noncontiguous peptides in the reverse order (2006)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2006-09-09
    Description: CD8-positive T lymphocytes recognize peptides that are usually derived from the degradation of cellular proteins and are presented by class I molecules of the major histocompatibility complex. Here we describe a human minor histocompatibility antigen created by a polymorphism in the SP110 nuclear phosphoprotein gene. The antigenic peptide comprises two noncontiguous SP110 peptide segments spliced together in reverse order to that in which they occur in the predicted SP110 protein. The antigenic peptide could be produced in vitro by incubation of precursor peptides with highly purified 20S proteasomes. Cutting and splicing probably occur within the proteasome by transpeptidation.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Warren, Edus H -- Vigneron, Nathalie J -- Gavin, Marc A -- Coulie, Pierre G -- Stroobant, Vincent -- Dalet, Alexandre -- Tykodi, Scott S -- Xuereb, Suzanne M -- Mito, Jeffrey K -- Riddell, Stanley R -- Van den Eynde, Benoit J -- CA106512/CA/NCI NIH HHS/ -- CA18029/CA/NCI NIH HHS/ -- P01 CA018029/CA/NCI NIH HHS/ -- New York, N.Y. -- Science. 2006 Sep 8;313(5792):1444-7.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Program in Immunology, Clinical Research Division, Fred Hutchinson Cancer Research Center, Seattle, WA 98109, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/16960008" target="_blank"〉PubMed〈/a〉
    Keywords: Alleles ; Amino Acid Motifs ; Amino Acid Sequence ; Amino Acid Substitution ; *Antigen Presentation ; B-Lymphocytes/immunology ; Cell Line, Transformed ; Cytotoxicity, Immunologic ; Electroporation ; HLA-A Antigens/immunology ; Humans ; Interferon-gamma/metabolism ; Male ; Middle Aged ; Minor Histocompatibility Antigens/genetics/*immunology/*metabolism ; Molecular Sequence Data ; Nuclear Proteins/chemistry/genetics/*immunology/*metabolism ; Peptide Fragments/metabolism ; Polymorphism, Single Nucleotide ; Proteasome Endopeptidase Complex/metabolism ; *Protein Splicing ; T-Lymphocytes, Cytotoxic/*immunology
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 2
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    Two Dobzhansky-Muller genes interact to cause hybrid lethality in Drosophila (2006)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2006-11-25
    Description: The Dobzhansky-Muller model proposes that hybrid incompatibilities are caused by the interaction between genes that have functionally diverged in the respective hybridizing species. Here, we show that Lethal hybrid rescue (Lhr) has functionally diverged in Drosophila simulans and interacts with Hybrid male rescue (Hmr), which has functionally diverged in D. melanogaster, to cause lethality in F1 hybrid males. LHR localizes to heterochromatic regions of the genome and has diverged extensively in sequence between these species in a manner consistent with positive selection. Rapidly evolving heterochromatic DNA sequences may be driving the evolution of this incompatibility gene.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Brideau, Nicholas J -- Flores, Heather A -- Wang, Jun -- Maheshwari, Shamoni -- Wang, Xu -- Barbash, Daniel A -- R01 GM074737-01/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 2006 Nov 24;314(5803):1292-5.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Molecular Biology and Genetics, Cornell University, Ithaca, NY 14853, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17124320" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Animals ; Chromosomal Proteins, Non-Histone/metabolism ; Chromosome Mapping ; Crosses, Genetic ; Drosophila/*genetics/physiology ; Drosophila Proteins/chemistry/*genetics/metabolism ; Drosophila melanogaster/*genetics/physiology ; *Evolution, Molecular ; Female ; *Genes, Insect ; Genetic Speciation ; *Hybridization, Genetic ; Male ; Molecular Sequence Data ; Selection, Genetic ; Transformation, Genetic ; Transgenes
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 3
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    Structure and mechanism of the lantibiotic cyclase involved in nisin biosynthesis (2006)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2006-03-11
    Description: Nisin is a posttranslationally modified antimicrobial peptide that is widely used as a food preservative. It contains five cyclic thioethers of varying sizes that are installed by a single enzyme, NisC. Reported here are the in vitro reconstitution of the cyclization process and the x-ray crystal structure of the NisC enzyme. The structure reveals similarities in fold and substrate activation with mammalian farnesyl transferases, suggesting that human homologs of NisC posttranslationally modify a cysteine of a protein substrate.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Li, Bo -- Yu, John Paul J -- Brunzelle, Joseph S -- Moll, Gert N -- van der Donk, Wilfred A -- Nair, Satish K -- GM58822/GM/NIGMS NIH HHS/ -- R01 GM079038/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 2006 Mar 10;311(5766):1464-7.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Biochemistry, University of Illinois at Urbana-Champaign, 600 South Mathews Avenue, Urbana, IL 61801, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/16527981" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Anti-Bacterial Agents/*biosynthesis/chemistry ; Carbon-Sulfur Lyases/chemistry/genetics/*metabolism ; Crystallography, X-Ray ; Farnesyltranstransferase/chemistry ; Humans ; Lactococcus lactis/*enzymology ; Models, Molecular ; Molecular Sequence Data ; Nisin/*biosynthesis/chemistry ; Protein Conformation ; Protein Processing, Post-Translational ; Sequence Homology, Amino Acid ; Structure-Activity Relationship
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 4
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    Rice domestication by reducing shattering (2006)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2006-03-11
    Description: Crop domestication frequently began with the selection of plants that did not naturally shed ripe fruits or seeds. The reduction in grain shattering that led to cereal domestication involved genetic loci of large effect. The molecular basis of this key domestication transition, however, remains unknown. Here we show that human selection of an amino acid substitution in the predicted DNA binding domain encoded by a gene of previously unknown function was primarily responsible for the reduction of grain shattering in rice domestication. The substitution undermined the gene function necessary for the normal development of an abscission layer that controls the separation of a grain from the pedicel.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Li, Changbao -- Zhou, Ailing -- Sang, Tao -- New York, N.Y. -- Science. 2006 Mar 31;311(5769):1936-9. Epub 2006 Mar 9.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Plant Biology, Michigan State University, East Lansing, MI 48824, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/16527928" target="_blank"〉PubMed〈/a〉
    Keywords: Alleles ; Amino Acid Sequence ; Amino Acid Substitution ; Biological Evolution ; Chromosome Mapping ; Computational Biology ; Crops, Agricultural/*genetics/growth & development ; Flowers/growth & development ; Gene Expression ; Genes, Plant ; Genotype ; Molecular Sequence Data ; Mutation ; Oryza/cytology/*genetics/growth & development ; Phenotype ; Plant Proteins/chemistry/*genetics ; Plants, Genetically Modified ; Quantitative Trait Loci ; Reverse Transcriptase Polymerase Chain Reaction ; Sequence Analysis, DNA ; Transcription Factors/chemistry/*genetics ; Transformation, Genetic
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 5
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    Structure of the vesicular stomatitis virus nucleoprotein-RNA complex (2006)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2006-06-17
    Description: Vesicular stomatitis virus is a negative-stranded RNA virus. Its nucleoprotein (N) binds the viral genomic RNA and is involved in multiple functions including transcription, replication, and assembly. We have determined a 2.9 angstrom structure of a complex containing 10 molecules of the N protein and 90 bases of RNA. The RNA is tightly sequestered in a cavity at the interface between two lobes of the N protein. This serves to protect the RNA in the absence of polynucleotide synthesis. For the RNA to be accessed, some conformational change in the N protein should be necessary.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Green, Todd J -- Zhang, Xin -- Wertz, Gail W -- Luo, Ming -- AI050066/AI/NIAID NIH HHS/ -- R37 AI012464/AI/NIAID NIH HHS/ -- R37 AI012464-28/AI/NIAID NIH HHS/ -- R37 AI012464-29/AI/NIAID NIH HHS/ -- R37 AI012464-30/AI/NIAID NIH HHS/ -- R37 AI012464-31/AI/NIAID NIH HHS/ -- R37AI012464/AI/NIAID NIH HHS/ -- New York, N.Y. -- Science. 2006 Jul 21;313(5785):357-60. Epub 2006 Jun 15.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Microbiology, School of Medicine, University of Alabama at Birmingham, 1025 18th Street South, Birmingham, AL 35294, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/16778022" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Crystallography, X-Ray ; Hydrophobic and Hydrophilic Interactions ; Models, Molecular ; Molecular Sequence Data ; Nucleic Acid Conformation ; Nucleocapsid Proteins/*chemistry/metabolism ; Protein Conformation ; Protein Structure, Secondary ; Protein Structure, Tertiary ; RNA, Viral/*chemistry/metabolism ; Ribonucleoproteins/*chemistry ; Sequence Alignment ; Vesicular stomatitis Indiana virus/*chemistry
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 6
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    Ammonia channel couples glutaminase with transamidase reactions in GatCAB (2006)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2006-07-01
    Description: The formation of glutaminyl transfer RNA (Gln-tRNA(Gln)) differs among the three domains of life. Most bacteria employ an indirect pathway to produce Gln-tRNA(Gln) by a heterotrimeric glutamine amidotransferase CAB (GatCAB) that acts on the misacylated Glu-tRNA(Gln). Here, we describe a series of crystal structures of intact GatCAB from Staphylococcus aureus in the apo form and in the complexes with glutamine, asparagine, Mn2+, and adenosine triphosphate analog. Two identified catalytic centers for the glutaminase and transamidase reactions are markedly distant but connected by a hydrophilic ammonia channel 30 A in length. Further, we show that the first U-A base pair in the acceptor stem and the D loop of tRNA(Gln) serve as identity elements essential for discrimination by GatCAB and propose a complete model for the overall concerted reactions to synthesize Gln-tRNA(Gln).〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Nakamura, Akiyoshi -- Yao, Min -- Chimnaronk, Sarin -- Sakai, Naoki -- Tanaka, Isao -- New York, N.Y. -- Science. 2006 Jun 30;312(5782):1954-8.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Faculty of Advanced Life Sciences, Hokkaido University, Sapporo 060-0810, Japan.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/16809541" target="_blank"〉PubMed〈/a〉
    Keywords: Adenosine Diphosphate/metabolism ; Amino Acid Sequence ; Aminoacyltransferases/metabolism ; Ammonia/*metabolism ; Apoenzymes/chemistry/metabolism ; Asparagine/metabolism ; Base Pairing ; Catalytic Domain ; Crystallography, X-Ray ; Glutaminase/metabolism ; Glutamine/*chemistry/metabolism ; Hydrogen Bonding ; Hydrophobic and Hydrophilic Interactions ; Magnesium/metabolism ; Manganese/metabolism ; Models, Molecular ; Molecular Sequence Data ; Mutation ; Nucleic Acid Conformation ; Protein Structure, Quaternary ; Protein Structure, Secondary ; Protein Structure, Tertiary ; Protein Subunits ; RNA, Bacterial/chemistry/metabolism ; RNA, Transfer, Amino Acyl/chemistry/*metabolism ; RNA, Transfer, Gln/*chemistry/metabolism ; Staphylococcus aureus/*enzymology/genetics/metabolism
    Print ISSN: 0036-8075
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    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 7
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    Human hair growth deficiency is linked to a genetic defect in the phospholipase gene LIPH (2006)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2006-11-11
    Description: The molecular mechanisms controlling human hair growth and scalp hair loss are poorly understood. By screening about 350,000 individuals in two populations from the Volga-Ural region of Russia, we identified a gene mutation in families who show an inherited form of hair loss and a hair growth defect. Affected individuals were homozygous for a deletion in the LIPH gene on chromosome 3q27, caused by short interspersed nuclear element-retrotransposon-mediated recombination. The LIPH gene is expressed in hair follicles and encodes a phospholipase called lipase H (alternatively known as membrane-associated phosphatidic acid-selective phospholipase A1alpha), an enzyme that regulates the production of bioactive lipids. These results suggest that lipase H participates in hair growth and development.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Kazantseva, Anastasiya -- Goltsov, Andrey -- Zinchenko, Rena -- Grigorenko, Anastasia P -- Abrukova, Anna V -- Moliaka, Yuri K -- Kirillov, Alexander G -- Guo, Zhiru -- Lyle, Stephen -- Ginter, Evgeny K -- Rogaev, Evgeny I -- K08-AR02179/AR/NIAMS NIH HHS/ -- New York, N.Y. -- Science. 2006 Nov 10;314(5801):982-5.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Brudnick Neuropsychiatric Research Institute, Department of Psychiatry, University of Massachusetts Medical School, 303 Belmont Street, Worcester, MA 01604, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17095700" target="_blank"〉PubMed〈/a〉
    Keywords: Alu Elements ; Amino Acid Sequence ; Base Sequence ; Chromosomes, Human, Pair 3/genetics ; Exons ; Female ; Gene Deletion ; Gene Expression ; Genetic Markers ; Hair/*growth & development ; Hair Follicle/enzymology ; Heterozygote ; Homozygote ; Humans ; Hypotrichosis/*genetics ; Lipase/chemistry/*genetics/metabolism ; Lipid Metabolism ; Lod Score ; Male ; Molecular Sequence Data ; Pedigree ; Protein Structure, Tertiary ; Recombination, Genetic ; Retroelements ; Russia ; Tandem Repeat Sequences
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 8
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    Tequila, a neurotrypsin ortholog, regulates long-term memory formation in Drosophila (2006)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2006-08-12
    Description: Mutations in the human neurotrypsin gene are associated with autosomal recessive mental retardation. To further understand the pathophysiological consequences of the lack of this serine protease, we studied Tequila (Teq), the Drosophila neurotrypsin ortholog, using associative memory as a behavioral readout. We found that teq inactivation resulted in a long-term memory (LTM)-specific defect. After LTM conditioning of wild-type flies, teq expression transiently increased in the mushroom bodies. Moreover, specific inhibition of teq expression in adult mushroom bodies resulted in a reversible LTM defect. Hence, the Teq pathway is essential for information processing in Drosophila.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Didelot, Gerard -- Molinari, Florence -- Tchenio, Paul -- Comas, Daniel -- Milhiet, Elodie -- Munnich, Arnold -- Colleaux, Laurence -- Preat, Thomas -- New York, N.Y. -- Science. 2006 Aug 11;313(5788):851-3.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Genes et Dynamique des Systemes de Memoire, UMR CNRS 7637, Ecole Superieure de Physique et de Chimie Industrielles, 10 Rue Vauquelin 75005 Paris, France.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/16902143" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Animals ; Animals, Genetically Modified ; Conditioning, Classical ; Drosophila Proteins/chemistry/genetics/*physiology ; Drosophila melanogaster/genetics/*physiology ; Gene Expression ; Gene Expression Regulation ; Humans ; Learning ; *Memory ; Mifepristone/pharmacology ; Models, Animal ; Molecular Sequence Data ; Mushroom Bodies/anatomy & histology/physiology ; Mutation ; Odors ; RNA Interference ; RNA, Messenger/genetics/metabolism ; Serine Endopeptidases/chemistry/genetics/*physiology
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 9
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    Engineering cooperativity in biomotor-protein assemblies (2006)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2006-03-11
    Description: A biosynthetic approach was developed to control and probe cooperativity in multiunit biomotor assemblies by linking molecular motors to artificial protein scaffolds. This approach provides precise control over spatial and elastic coupling between motors. Cooperative interactions between monomeric kinesin-1 motors attached to protein scaffolds enhance hydrolysis activity and microtubule gliding velocity. However, these interactions are not influenced by changes in the elastic properties of the scaffold, distinguishing multimotor transport from that powered by unorganized monomeric motors. These results highlight the role of supramolecular architecture in determining mechanisms of collective transport.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Diehl, Michael R -- Zhang, Kechun -- Lee, Heun Jin -- Tirrell, David A -- New York, N.Y. -- Science. 2006 Mar 10;311(5766):1468-71.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, CA 91125, USA. diehl@rice.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/16527982" target="_blank"〉PubMed〈/a〉
    Keywords: Adenosine Triphosphatases/chemistry ; Amino Acid Sequence ; Elasticity ; Elastin/chemistry ; Hydrolysis ; Kinesin/chemistry ; Microtubules/physiology ; Models, Biological ; Molecular Motor Proteins/*physiology ; Molecular Sequence Data ; Protein Engineering ; Protein Structure, Tertiary ; Proteins/chemistry/*physiology ; Recombinant Proteins/chemistry ; Structure-Activity Relationship
    Print ISSN: 0036-8075
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    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 10
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    Extending top-down mass spectrometry to proteins with masses greater than 200 kilodaltons (2006)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2006-10-07
    Description: For characterization of sequence and posttranslational modifications, molecular and fragment ion mass data from ionizing and dissociating a protein in the mass spectrometer are far more specific than are masses of peptides from the protein's digestion. We extend the approximately 500-residue, approximately 50-kilodalton (kD) dissociation limitation of this top-down methodology by using electrospray additives, heated vaporization, and separate noncovalent and covalent bond dissociation. This process can cleave 287 interresidue bonds in the termini of a 1314-residue (144-kD) protein, specify previously unidentified disulfide bonds between 8 of 27 cysteines in a 1714-residue (200-kD) protein, and correct sequence predictions in two proteins, one with 2153 residues (229 kD).〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Han, Xuemei -- Jin, Mi -- Breuker, Kathrin -- McLafferty, Fred W -- GM16609/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 2006 Oct 6;314(5796):109-12.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Chemistry and Chemical Biology, Baker Laboratory, Cornell University, Ithaca, NY 14853, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17023655" target="_blank"〉PubMed〈/a〉
    Keywords: Acyltransferases/chemistry ; Amino Acid Sequence ; Carbon-Nitrogen Ligases with Glutamine as Amide-N-Donor/chemistry ; Chemistry, Physical ; Complement C4/chemistry ; Cysteine/chemistry ; Humans ; Mass Spectrometry/*methods ; Molecular Weight ; Peptide Fragments/chemistry ; Physicochemical Phenomena ; Protein Conformation ; Protein Folding ; Protein Processing, Post-Translational ; Proteins/*chemistry ; Proteomics ; Spectrometry, Mass, Electrospray Ionization/*methods
    Print ISSN: 0036-8075
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    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 11
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    A bacterial protein enhances the release and efficacy of liposomal cancer drugs (2006)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2006-11-25
    Description: Clostridium novyi-NT is an anaerobic bacterium that can infect hypoxic regions within experimental tumors. Because C. novyi-NT lyses red blood cells, we hypothesized that its membrane-disrupting properties could be exploited to enhance the release of liposome-encapsulated drugs within tumors. Here, we show that treatment of mice bearing large, established tumors with C. novyi-NT plus a single dose of liposomal doxorubicin often led to eradication of the tumors. The bacterial factor responsible for the enhanced drug release was identified as a previously unrecognized protein termed liposomase. This protein could potentially be incorporated into diverse experimental approaches for the specific delivery of chemotherapeutic agents to tumors.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Cheong, Ian -- Huang, Xin -- Bettegowda, Chetan -- Diaz, Luis A Jr -- Kinzler, Kenneth W -- Zhou, Shibin -- Vogelstein, Bert -- CA062924/CA/NCI NIH HHS/ -- New York, N.Y. -- Science. 2006 Nov 24;314(5803):1308-11.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Howard Hughes Medical Institute and the Ludwig Center for Cancer Genetics and Therapeutics, Johns Hopkins Kimmel Comprehensive Cancer Center, Baltimore, MD 21231, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17124324" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Animals ; Antineoplastic Agents/*administration & dosage/pharmacokinetics/therapeutic use ; Bacterial Proteins/chemistry/genetics/*metabolism ; Base Sequence ; Camptothecin/administration & dosage/analogs & ; derivatives/pharmacokinetics/therapeutic use ; Cell Line, Tumor ; Cloning, Molecular ; Clostridium/*chemistry/genetics ; Colorectal Neoplasms/*drug therapy ; Doxorubicin/*administration & dosage/pharmacokinetics/therapeutic use ; Drug Carriers ; Humans ; Lipase/chemistry/genetics/*metabolism ; Lipid Bilayers/chemistry ; Liposomes/chemistry/*metabolism ; Mice ; Molecular Sequence Data ; Mutation ; Neoplasm Transplantation ; Protein Structure, Tertiary
    Print ISSN: 0036-8075
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    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 12
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    Structural basis for double-stranded RNA processing by Dicer (2006)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2006-01-18
    Description: The specialized ribonuclease Dicer initiates RNA interference by cleaving double-stranded RNA (dsRNA) substrates into small fragments about 25 nucleotides in length. In the crystal structure of an intact Dicer enzyme, the PAZ domain, a module that binds the end of dsRNA, is separated from the two catalytic ribonuclease III (RNase III) domains by a flat, positively charged surface. The 65 angstrom distance between the PAZ and RNase III domains matches the length spanned by 25 base pairs of RNA. Thus, Dicer itself is a molecular ruler that recognizes dsRNA and cleaves a specified distance from the helical end.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Macrae, Ian J -- Zhou, Kaihong -- Li, Fei -- Repic, Adrian -- Brooks, Angela N -- Cande, W Zacheus -- Adams, Paul D -- Doudna, Jennifer A -- New York, N.Y. -- Science. 2006 Jan 13;311(5758):195-8.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Molecular and Cell Biology, University of California, Berkeley, CA 94720, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/16410517" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Animals ; Conserved Sequence ; Crystallography, X-Ray ; Giardia lamblia/enzymology ; Humans ; Lanthanoid Series Elements/metabolism ; Models, Molecular ; Molecular Sequence Data ; Protein Structure, Tertiary ; RNA Interference ; RNA, Double-Stranded/*metabolism ; RNA, Protozoan/metabolism ; Recombinant Fusion Proteins/genetics/metabolism ; Ribonuclease III/*chemistry/metabolism ; Schizosaccharomyces/genetics ; Structure-Activity Relationship
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  • 13
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    Structure of tracheal cytotoxin in complex with a heterodimeric pattern-recognition receptor (2006)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2006-03-25
    Description: Tracheal cytotoxin (TCT), a naturally occurring fragment of Gram-negative peptidoglycan, is a potent elicitor of innate immune responses in Drosophila. It induces the heterodimerization of its recognition receptors, the peptidoglycan recognition proteins (PGRPs) LCa and LCx, which activates the immune deficiency pathway. The crystal structure at 2.1 angstrom resolution of TCT in complex with the ectodomains of PGRP-LCa and PGRP-LCx shows that TCT is bound to and presented by the LCx ectodomain for recognition by the LCa ectodomain; the latter lacks a canonical peptidoglycan-docking groove conserved in other PGRPs. The interface, revealed in atomic detail, between TCT and the receptor complex highlights the importance of the anhydro-containing disaccharide in bridging the two ectodomains together and the critical role of diaminopimelic acid as the specificity determinant for PGRP interaction.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Chang, Chung-I -- Chelliah, Yogarany -- Borek, Dominika -- Mengin-Lecreulx, Dominique -- Deisenhofer, Johann -- New York, N.Y. -- Science. 2006 Mar 24;311(5768):1761-4.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Howard Hughes Medical Institute, University of Texas Southwestern Medical Center at Dallas, 6001 Forest Park Road, Dallas, TX 75390-9050, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/16556841" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Animals ; Carrier Proteins/*chemistry/metabolism ; Crystallization ; Crystallography, X-Ray ; Cytotoxins/*chemistry/metabolism ; Drosophila melanogaster ; Hydrogen Bonding ; Hydrophobic and Hydrophilic Interactions ; Models, Molecular ; Molecular Sequence Data ; Peptidoglycan/*chemistry/metabolism ; Protein Conformation ; Protein Structure, Secondary ; Protein Structure, Tertiary
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    Virology. Genomic analysis hints at H5N1 pathogenicity (2006)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2006-01-28
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Normile, Dennis -- New York, N.Y. -- Science. 2006 Jan 27;311(5760):457.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/16439636" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Animals ; Base Sequence ; Birds ; Databases, Nucleic Acid ; Genetic Variation ; *Genome, Viral ; Humans ; Influenza A Virus, H5N1 Subtype/*genetics/*pathogenicity ; Influenza in Birds/*virology ; Influenza, Human/*virology ; Ligands ; Poultry ; RNA, Viral/genetics ; Viral Nonstructural Proteins/chemistry/*genetics/metabolism ; Virulence/genetics
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    Evolution. Darwin for all seasons (2006)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 2006-07-22
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Szathmary, Eors -- New York, N.Y. -- Science. 2006 Jul 21;313(5785):306-7.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Institute of Biology, Eotvos University Budapest, and Collegium Budapest (Institute for Advanced Study), 2 Szentharomsag utca, H-1014 Budapest, Hungary. szathmary@colbud.hu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/16857926" target="_blank"〉PubMed〈/a〉
    Keywords: *Biological Evolution ; Chemical Phenomena ; Chemistry ; Computational Biology ; Cooperative Behavior ; Cultural Evolution ; Exobiology ; Humans ; Language ; Models, Biological ; Models, Theoretical ; Molecular Biology ; Origin of Life ; *Research ; Selection, Genetic
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    Herve This profile. The joy of evidence-based cooking (2006)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 2006-11-25
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Enserink, Martin -- New York, N.Y. -- Science. 2006 Nov 24;314(5803):1235-6.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17124302" target="_blank"〉PubMed〈/a〉
    Keywords: Chemistry ; *Cooking ; *Food ; France ; History, 20th Century ; History, 21st Century
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    Biochemistry. Loop grafting and the origins of enzyme species (2006)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 2006-01-28
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Tawfik, Dan S -- New York, N.Y. -- Science. 2006 Jan 27;311(5760):475-6.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Biological Chemistry, Weizmann Institute of Science, Rehovot 76100, Israel. tawfik@weizmann.ac.il〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/16439649" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Binding Sites ; Catalytic Domain ; *Directed Molecular Evolution ; Evolution, Molecular ; *Protein Engineering ; Substrate Specificity ; Thiolester Hydrolases/*chemistry/*metabolism ; beta-Lactamases/chemistry/*metabolism ; beta-Lactams/metabolism
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    Genome of Rice Cluster I archaea--the key methane producers in the rice rhizosphere (2006)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2006-07-22
    Description: Rice fields are a global source of the greenhouse gas methane, which is produced by methanogenic archaea, and by methanogens of Rice Cluster I (RC-I) in particular. RC-I methanogens are not yet available in pure culture, and the mechanistic reasons for their prevalence in rice fields are unknown. We reconstructed a complete RC-I genome (3.18 megabases) using a metagenomic approach. Sequence analysis demonstrated an aerotolerant, H2/CO2-dependent lifestyle and enzymatic capacities for carbohydrate metabolism and assimilatory sulfate reduction, hitherto unknown among methanogens. These capacities and a unique set of antioxidant enzymes and DNA repair mechanisms as well as oxygen-insensitive enzymes provide RC-I with a selective advantage over other methanogens in its habitats, thereby explaining the prevalence of RC-I methanogens in the rice rhizosphere.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Erkel, Christoph -- Kube, Michael -- Reinhardt, Richard -- Liesack, Werner -- New York, N.Y. -- Science. 2006 Jul 21;313(5785):370-2.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Max-Planck-Institute for Terrestrial Microbiology, Karl-von-Frisch-Strasse, 35043 Marburg, Germany.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/16857943" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Amino Acids/biosynthesis/metabolism ; Carbohydrate Metabolism ; DNA Repair ; Euryarchaeota/classification/*genetics/metabolism/physiology ; *Genome, Archaeal ; Genomics ; Glycolysis ; Methane/*biosynthesis ; Methanomicrobiales/classification/genetics/metabolism/physiology ; Methanosarcinales/classification/genetics/metabolism/physiology ; Molecular Sequence Data ; Oryza/*microbiology ; Oxidative Stress ; Pyruvic Acid/metabolism ; Sequence Alignment ; Sequence Analysis, DNA ; *Soil Microbiology ; Sulfates/metabolism ; Sulfur/metabolism
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    Crystal structure of a divalent metal ion transporter CorA at 2.9 angstrom resolution (2006)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 2006-07-22
    Description: CorA family members are ubiquitously distributed transporters of divalent metal cations and are considered to be the primary Mg2+ transporter of Bacteria and Archaea. We have determined a 2.9 angstrom resolution structure of CorA from Thermotoga maritima that reveals a pentameric cone-shaped protein. Two potential regulatory metal binding sites are found in the N-terminal domain that bind both Mg2+ and Co2+. The structure of CorA supports an efflux system involving dehydration and rehydration of divalent metal ions potentially mediated by a ring of conserved aspartate residues at the cytoplasmic entrance and a carbonyl funnel at the periplasmic side of the pore.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Eshaghi, Said -- Niegowski, Damian -- Kohl, Andreas -- Martinez Molina, Daniel -- Lesley, Scott A -- Nordlund, Par -- New York, N.Y. -- Science. 2006 Jul 21;313(5785):354-7.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Division of Biophysics, Department of Medical Biochemistry and Biophysics, Karolinska Institute, SE-171 77 Stockholm, Sweden. Said.Eshaghi@ki.se〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/16857941" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Bacterial Proteins/*chemistry/metabolism ; Binding Sites ; Cation Transport Proteins/*chemistry/metabolism ; Chlorides/analysis/metabolism ; Cobalt/chemistry/*metabolism ; Crystallography, X-Ray ; Hydrophobic and Hydrophilic Interactions ; Magnesium/chemistry/*metabolism ; Models, Molecular ; Molecular Sequence Data ; Protein Conformation ; Protein Folding ; Protein Structure, Quaternary ; Protein Structure, Secondary ; Protein Structure, Tertiary ; Sequence Alignment ; Thermotoga maritima/*chemistry ; Water/chemistry
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  • 20
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    Anaphase inactivation of the spindle checkpoint (2006)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 2006-07-11
    Description: The spindle checkpoint delays cell cycle progression until microtubules attach each pair of sister chromosomes to opposite poles of the mitotic spindle. Following sister chromatid separation, however, the checkpoint ignores chromosomes whose kinetochores are attached to only one spindle pole, a state that activates the checkpoint prior to metaphase. We demonstrate that, in budding yeast, mutual inhibition between the anaphase-promoting complex (APC) and Mps1, an essential component of the checkpoint, leads to sustained inactivation of the spindle checkpoint. Mps1 protein abundance decreases in anaphase, and Mps1 is a target of the APC. Furthermore, expression of Mps1 in anaphase, or repression of the APC in anaphase, reactivates the spindle checkpoint. This APC-Mps1 feedback circuit allows cells to irreversibly inactivate the checkpoint during anaphase.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Palframan, William J -- Meehl, Janet B -- Jaspersen, Sue L -- Winey, Mark -- Murray, Andrew W -- GM43987/GM/NIGMS NIH HHS/ -- GM51312/GM/NIGMS NIH HHS/ -- R37 GM043987/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 2006 Aug 4;313(5787):680-4. Epub 2006 Jul 6.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Molecular and Cellular Biology, Biological Laboratories, Harvard University, 16 Divinity Avenue, Cambridge, MA 02138, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/16825537" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Anaphase/*physiology ; Anaphase-Promoting Complex-Cyclosome ; Cdc20 Proteins ; Cell Cycle Proteins/metabolism ; Chromosomes, Fungal/physiology ; Feedback, Physiological ; GTP-Binding Proteins/metabolism ; Kinetochores/physiology ; Mad2 Proteins ; Mitosis ; Molecular Sequence Data ; Nuclear Proteins/metabolism ; Phosphorylation ; Protein-Serine-Threonine Kinases/genetics/*metabolism ; Protein-Tyrosine Kinases/genetics/*metabolism ; Recombinant Fusion Proteins/metabolism ; Saccharomyces cerevisiae/*cytology/metabolism ; Saccharomyces cerevisiae Proteins/genetics/*metabolism ; Securin ; Spindle Apparatus/*physiology ; Ubiquitin-Protein Ligase Complexes/*metabolism
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  • 21
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    Nitrogen fixation at 92 degrees C by a hydrothermal vent archaeon (2006)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 2006-12-16
    Description: A methanogenic archaeon isolated from deep-sea hydrothermal vent fluid was found to reduce N(2) to NH(3) at up to 92 degrees C, which is 28 degrees C higher than the current upper temperature limit of biological nitrogen fixation. The 16S ribosomal RNA gene of the hyperthermophilic nitrogen fixer, designated FS406-22, was 99% similar to that of non-nitrogen fixing Methanocaldococcus jannaschii DSM 2661. At its optimal growth temperature of 90 degrees C, FS406-22 incorporated (15)N(2) and expressed nifH messenger RNA. This increase in the temperature limit of nitrogen fixation could reveal a broader range of conditions for life in the subseafloor biosphere and other nitrogen-limited ecosystems than previously estimated.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Mehta, Mausmi P -- Baross, John A -- New York, N.Y. -- Science. 2006 Dec 15;314(5806):1783-6.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉School of Oceanography, University of Washington, Seattle, WA 98195, USA. mausmi@alum.mit.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17170307" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Archaea/classification/genetics/*isolation & purification/*metabolism ; Archaeal Proteins/chemistry/genetics/metabolism ; Base Sequence ; *Ecosystem ; Genes, Archaeal ; Genes, rRNA ; Geologic Sediments/microbiology ; *Hot Temperature ; Molecular Sequence Data ; Nitrogen/metabolism ; *Nitrogen Fixation/genetics ; Nitrogenase/chemistry/*genetics/metabolism ; Operon ; Oxidation-Reduction ; Oxidoreductases/chemistry/genetics/metabolism ; Pacific Ocean ; Phylogeny ; RNA, Ribosomal, 16S/genetics ; Seawater/*microbiology ; Volcanic Eruptions
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    Recognition of histone H3 lysine-4 methylation by the double tudor domain of JMJD2A (2006)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 2006-04-08
    Description: Biological responses to histone methylation critically depend on the faithful readout and transduction of the methyl-lysine signal by "effector" proteins, yet our understanding of methyl-lysine recognition has so far been limited to the study of histone binding by chromodomain and WD40-repeat proteins. The double tudor domain of JMJD2A, a Jmjc domain-containing histone demethylase, binds methylated histone H3-K4 and H4-K20. We found that the double tudor domain has an interdigitated structure, and the unusual fold is required for its ability to bind methylated histone tails. The cocrystal structure of the JMJD2A double tudor domain with a trimethylated H3-K4 peptide reveals that the trimethyl-K4 is bound in a cage of three aromatic residues, two of which are from the tudor-2 motif, whereas the binding specificity is determined by side-chain interactions involving amino acids from the tudor-1 motif. Our study provides mechanistic insights into recognition of methylated histone tails by tudor domains and reveals the structural intricacy of methyl-lysine recognition by two closely spaced effector domains.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Huang, Ying -- Fang, Jia -- Bedford, Mark T -- Zhang, Yi -- Xu, Rui-Ming -- DK62248/DK/NIDDK NIH HHS/ -- GM 63718/GM/NIGMS NIH HHS/ -- GM68804/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 2006 May 5;312(5774):748-51. Epub 2006 Apr 6.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉W. M. Keck Structural Biology Laboratory, Cold Spring Harbor Laboratory, Cold Spring Harbor, NY 11724, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/16601153" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Motifs ; Amino Acid Sequence ; Binding Sites ; Crystallography, X-Ray ; DNA-Binding Proteins/*chemistry/genetics/*metabolism ; Histones/*chemistry/*metabolism ; Humans ; Hydrogen Bonding ; Jumonji Domain-Containing Histone Demethylases ; Lysine/metabolism ; Methylation ; Models, Molecular ; Molecular Sequence Data ; Mutation ; Oxidoreductases, N-Demethylating ; Protein Binding ; Protein Conformation ; Protein Folding ; Protein Structure, Tertiary ; Static Electricity ; Transcription Factors/*chemistry/genetics/*metabolism
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    BKCa-Cav channel complexes mediate rapid and localized Ca2+-activated K+ signaling (2006)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 2006-10-28
    Description: Large-conductance calcium- and voltage-activated potassium channels (BKCa) are dually activated by membrane depolarization and elevation of cytosolic calcium ions (Ca2+). Under normal cellular conditions, BKCa channel activation requires Ca2+ concentrations that typically occur in close proximity to Ca2+ sources. We show that BKCa channels affinity-purified from rat brain are assembled into macromolecular complexes with the voltage-gated calcium channels Cav1.2 (L-type), Cav2.1 (P/Q-type), and Cav2.2 (N-type). Heterologously expressed BKCa-Cav complexes reconstitute a functional "Ca2+ nanodomain" where Ca2+ influx through the Cav channel activates BKCa in the physiological voltage range with submillisecond kinetics. Complex formation with distinct Cav channels enables BKCa-mediated membrane hyperpolarization that controls neuronal firing pattern and release of hormones and transmitters in the central nervous system.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Berkefeld, Henrike -- Sailer, Claudia A -- Bildl, Wolfgang -- Rohde, Volker -- Thumfart, Jorg-Oliver -- Eble, Silke -- Klugbauer, Norbert -- Reisinger, Ellen -- Bischofberger, Josef -- Oliver, Dominik -- Knaus, Hans-Gunther -- Schulte, Uwe -- Fakler, Bernd -- New York, N.Y. -- Science. 2006 Oct 27;314(5799):615-20.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Institute of Physiology, University of Freiburg, Hermann-Herder-Strasse 7, 79104 Freiburg, Germany.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17068255" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Animals ; Brain Chemistry ; CHO Cells ; Calcium/*metabolism ; Calcium Channels, L-Type/drug effects/isolation & purification/*metabolism ; Calcium Channels, N-Type/drug effects/isolation & purification/*metabolism ; Calcium Signaling ; Chromaffin Cells/drug effects/metabolism ; Cricetinae ; Cricetulus ; Egtazic Acid/analogs & derivatives/pharmacology ; Large-Conductance Calcium-Activated Potassium Channels/drug effects/isolation & ; purification/*metabolism ; Membrane Potentials/drug effects ; Molecular Sequence Data ; Patch-Clamp Techniques ; Potassium/*metabolism ; Rats ; *Signal Transduction ; Transfection ; Xenopus
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    Protrudin induces neurite formation by directional membrane trafficking (2006)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 2006-11-04
    Description: Guanosine triphosphatases of the Rab family are key regulators of membrane trafficking, with Rab11 playing a specific role in membrane recycling. We identified a mammalian protein, protrudin, that promoted neurite formation through interaction with the guanosine diphosphate (GDP)-bound form of Rab11. Phosphorylation of protrudin by extracellular signal-regulated kinase (ERK) in response to nerve growth factor promoted protrudin association with Rab11-GDP. Down-regulation of protrudin by RNA interference induced membrane extension in all directions and inhibited neurite formation. Thus, protrudin regulates Rab11-dependent membrane recycling to promote the directional membrane trafficking required for neurite formation.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Shirane, Michiko -- Nakayama, Keiichi I -- New York, N.Y. -- Science. 2006 Nov 3;314(5800):818-21.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Molecular and Cellular Biology, Medical Institute of Bioregulation, Kyushu University, 3-1-1 Maidashi, Higashi-ku, Fukuoka, Fukuoka 812-8582, Japan.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17082457" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Animals ; Carrier Proteins/chemistry/genetics/*metabolism ; Cell Adhesion Molecules/metabolism ; Cell Line ; Cell Membrane/*metabolism ; Extracellular Signal-Regulated MAP Kinases/metabolism ; Guanosine Diphosphate/metabolism ; HeLa Cells ; Humans ; MAP Kinase Kinase 1/metabolism ; Membrane Proteins ; Mice ; Mice, Inbred C57BL ; Molecular Sequence Data ; Nerve Growth Factor/pharmacology/physiology ; Neurites/*physiology ; PC12 Cells ; Phosphorylation ; RNA Interference ; Rats ; Recombinant Fusion Proteins/chemistry/metabolism ; Vesicular Transport Proteins ; rab GTP-Binding Proteins/metabolism
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    From the genome to the proteome: uncovering peptides in the Apis brain (2006)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2006-10-28
    Description: Neuropeptides, critical brain peptides that modulate animal behavior by affecting the activity of almost every neuronal circuit, are inherently difficult to predict directly from a nascent genome sequence because of extensive posttranslational processing. The combination of bioinformatics and proteomics allows unprecedented neuropeptide discovery from an unannotated genome. Within the Apis mellifera genome, we have inferred more than 200 neuropeptides and have confirmed the sequences of 100 peptides. This study lays the groundwork for future molecular studies of Apis neuropeptides with the identification of 36 genes, 33 of which were previously unreported.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Hummon, Amanda B -- Richmond, Timothy A -- Verleyen, Peter -- Baggerman, Geert -- Huybrechts, Jurgen -- Ewing, Michael A -- Vierstraete, Evy -- Rodriguez-Zas, Sandra L -- Schoofs, Liliane -- Robinson, Gene E -- Sweedler, Jonathan V -- DC006395/DC/NIDCD NIH HHS/ -- GM068946/GM/NIGMS NIH HHS/ -- NS31609/NS/NINDS NIH HHS/ -- P30 DA01830/DA/NIDA NIH HHS/ -- P30 DA018310/DA/NIDA NIH HHS/ -- R01 GM068946/GM/NIGMS NIH HHS/ -- R01 NS031609/NS/NINDS NIH HHS/ -- New York, N.Y. -- Science. 2006 Oct 27;314(5799):647-9.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Chemistry, University of Illinois, Urbana, IL 61801, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17068263" target="_blank"〉PubMed〈/a〉
    Keywords: Algorithms ; Amino Acid Motifs ; Amino Acid Sequence ; Animals ; Bees/*chemistry/*genetics ; Brain Chemistry ; Codon ; Computational Biology ; *Genes, Insect ; Genome, Insect ; Insect Proteins/*chemistry/*genetics ; Mass Spectrometry ; Molecular Sequence Data ; Neuropeptides/*chemistry/*genetics ; Protein Precursors/chemistry/genetics ; Proteome
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    Autophagic fungal cell death is necessary for infection by the rice blast fungus (2006)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 2006-04-29
    Description: Rice blast is caused by the fungus Magnaporthe grisea, which elaborates specialized infection cells called appressoria to penetrate the tough outer cuticle of the rice plant Oryza sativa. We found that the formation of an appressorium required, sequentially, the completion of mitosis, nuclear migration, and death of the conidium (fungal spore) from which the infection originated. Genetic intervention during mitosis prevented both appressorium development and conidium death. Impairment of autophagy, by the targeted mutation of the MgATG8 gene, arrested conidial cell death but rendered the fungus nonpathogenic. Thus, the initiation of rice blast requires autophagic cell death of the conidium.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Veneault-Fourrey, Claire -- Barooah, Madhumita -- Egan, Martin -- Wakley, Gavin -- Talbot, Nicholas J -- New York, N.Y. -- Science. 2006 Apr 28;312(5773):580-3.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉School of Biosciences, University of Exeter, Washington Singer Laboratories, Perry Road, Exeter EX4 4QG, UK.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/16645096" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; *Autophagy ; Benomyl/pharmacology ; Cell Nucleus/physiology ; Cell Nucleus Division ; Genes, Fungal ; Hydroxyurea/pharmacology ; Magnaporthe/*cytology/genetics/pathogenicity/*physiology ; Microtubule-Associated Proteins/genetics/physiology ; Mitosis/drug effects ; Molecular Sequence Data ; Morphogenesis ; Mutation ; Oryza/*microbiology ; Plant Diseases/*microbiology ; Spores, Fungal/cytology/*physiology
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    JETLAG resets the Drosophila circadian clock by promoting light-induced degradation of TIMELESS (2006)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 2006-06-24
    Description: Organisms ranging from bacteria to humans synchronize their internal clocks to daily cycles of light and dark. Photic entrainment of the Drosophila clock is mediated by proteasomal degradation of the clock protein TIMELESS (TIM). We have identified mutations in jetlag-a gene coding for an F-box protein with leucine-rich repeats-that result in reduced light sensitivity of the circadian clock. Mutant flies show rhythmic behavior in constant light, reduced phase shifts in response to light pulses, and reduced light-dependent degradation of TIM. Expression of JET along with the circadian photoreceptor cryptochrome (CRY) in cultured S2R cells confers light-dependent degradation onto TIM, thereby reconstituting the acute response + of the circadian clock to light in a cell culture system. Our results suggest that JET is essential for resetting the clock by transmitting light signals from CRY to TIM.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2767177/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2767177/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Koh, Kyunghee -- Zheng, Xiangzhong -- Sehgal, Amita -- NS048471/NS/NINDS NIH HHS/ -- R01 NS048471/NS/NINDS NIH HHS/ -- R01 NS048471-02/NS/NINDS NIH HHS/ -- Howard Hughes Medical Institute/ -- New York, N.Y. -- Science. 2006 Jun 23;312(5781):1809-12.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Howard Hughes Medical Institute, Department of Neuroscience, University of Pennsylvania School of Medicine, Philadelphia, PA 19104, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/16794082" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Amino Acid Substitution ; Animals ; Cells, Cultured ; *Circadian Rhythm ; Cryptochromes ; Drosophila/chemistry/genetics/physiology ; Drosophila Proteins/chemistry/*genetics/*metabolism/*physiology ; Drosophila melanogaster/chemistry/*genetics/*physiology ; Eye Proteins/metabolism ; F-Box Proteins/chemistry/*genetics/*physiology ; Female ; *Light ; Male ; Models, Biological ; Molecular Sequence Data ; Mutation ; Protein Structure, Tertiary ; Receptors, G-Protein-Coupled/metabolism ; Transgenes ; Ubiquitin/metabolism
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    A plant peptide encoded by CLV3 identified by in situ MALDI-TOF MS analysis (2006)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2006-08-12
    Description: The Arabidopsis CLAVATA3 (CLV3) gene encodes a stem cell-specific protein presumed to be a precursor of a secreted peptide hormone. Matrix-assisted laser desorption/ionization-time-of-flight mass spectrometry (MALDI-TOF MS) applied to in situ Arabidopsis tissues determined the structure of a modified 12-amino acid peptide (MCLV3), which was derived from a conserved motif in the CLV3 sequence. Synthetic MCLV3 induced shoot and root meristem consumption as cells differentiated into other organs, displaying the typical phenotype of transgenic plants overexpressing CLV3. These results suggest that the functional peptide of CLV3 is MCLV3.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Kondo, Tatsuhiko -- Sawa, Shinichiro -- Kinoshita, Atsuko -- Mizuno, Satoko -- Kakimoto, Tatsuo -- Fukuda, Hiroo -- Sakagami, Youji -- New York, N.Y. -- Science. 2006 Aug 11;313(5788):845-8.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Graduate School of Bio-Agricultural Sciences, Nagoya University, Chikusa, Nagoya, 464-8601, Japan.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/16902141" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Motifs ; Amino Acid Sequence ; Arabidopsis/*cytology/genetics/metabolism ; Arabidopsis Proteins/*chemistry/genetics/*metabolism/pharmacology ; Cell Differentiation ; Cells, Cultured ; Hydroxyproline/chemistry ; Meristem/*cytology/drug effects/metabolism ; Molecular Sequence Data ; Oligopeptides/chemistry/*metabolism/pharmacology ; Plant Roots/growth & development ; Plants, Genetically Modified ; Signal Transduction ; Spectrometry, Mass, Matrix-Assisted Laser Desorption-Ionization ; Stem Cells/cytology
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    The Neurospora checkpoint kinase 2: a regulatory link between the circadian and cell cycles (2006)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 2006-07-01
    Description: The clock gene period-4 (prd-4) in Neurospora was identified by a single allele displaying shortened circadian period and altered temperature compensation. Positional cloning followed by functional tests show that PRD-4 is an ortholog of mammalian checkpoint kinase 2 (Chk2). Expression of prd-4 is regulated by the circadian clock and, reciprocally, PRD-4 physically interacts with the clock component FRQ, promoting its phosphorylation. DNA-damaging agents can reset the clock in a manner that depends on time of day, and this resetting is dependent on PRD-4. Thus, prd-4, the Neurospora Chk2, identifies a molecular link that feeds back conditionally from circadian output to input and the cell cycle.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Pregueiro, Antonio M -- Liu, Qiuyun -- Baker, Christopher L -- Dunlap, Jay C -- Loros, Jennifer J -- MH44651/MH/NIMH NIH HHS/ -- P01 GM068087/GM/NIGMS NIH HHS/ -- R01 GM034985/GM/NIGMS NIH HHS/ -- R37GM34985/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 2006 Aug 4;313(5787):644-9. Epub 2006 Jun 29.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Genetics, Dartmouth Medical School, Hanover, NH 03755, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/16809488" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; *Cell Cycle ; Checkpoint Kinase 2 ; *Circadian Rhythm ; Cloning, Molecular ; DNA Damage ; Feedback, Physiological ; Fungal Proteins/chemistry/genetics/metabolism ; Gene Expression Regulation, Fungal ; Genes, Fungal ; Methyl Methanesulfonate/pharmacology ; Molecular Sequence Data ; Mutation ; Neurospora/*enzymology/genetics ; Neurospora crassa/cytology/*enzymology/*physiology ; Phosphorylation ; Protein-Serine-Threonine Kinases/chemistry/*genetics/*metabolism
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    FG-rich repeats of nuclear pore proteins form a three-dimensional meshwork with hydrogel-like properties (2006)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 2006-11-04
    Description: Nuclear pore complexes permit rapid passage of cargoes bound to nuclear transport receptors, but otherwise suppress nucleocytoplasmic fluxes of inert macromolecules 〉/=30 kilodaltons. To explain this selectivity, a sieve structure of the permeability barrier has been proposed that is created through reversible cross-linking between Phe and Gly (FG)-rich nucleoporin repeats. According to this model, nuclear transport receptors overcome the size limit of the sieve and catalyze their own nuclear pore-passage by a competitive disruption of adjacent inter-repeat contacts, which transiently opens adjoining meshes. Here, we found that phenylalanine-mediated inter-repeat interactions indeed cross-link FG-repeat domains into elastic and reversible hydrogels. Furthermore, we obtained evidence that such hydrogel formation is required for viability in yeast.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Frey, Steffen -- Richter, Ralf P -- Gorlich, Dirk -- New York, N.Y. -- Science. 2006 Nov 3;314(5800):815-7.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Zentrum fur Molekulare Biologie der Universitat Heidelberg (ZMBH), INF 282, D-69120 Heidelberg, Germany.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17082456" target="_blank"〉PubMed〈/a〉
    Keywords: Active Transport, Cell Nucleus ; Amino Acid Motifs ; Amino Acid Sequence ; Biopolymers ; Calcium-Binding Proteins/*chemistry/genetics/*metabolism ; Fluorescence Recovery After Photobleaching ; HeLa Cells ; Humans ; Hydrogels ; Hydrogen-Ion Concentration ; Hydrophobic and Hydrophilic Interactions ; Models, Biological ; Molecular Sequence Data ; Mutation ; Nuclear Pore/chemistry/*metabolism ; Nuclear Pore Complex Proteins/*chemistry/*metabolism ; Nuclear Proteins/*chemistry/genetics/*metabolism ; Nucleocytoplasmic Transport Proteins/*metabolism ; Permeability ; Phenylalanine/chemistry ; Protein Structure, Tertiary ; Repetitive Sequences, Amino Acid ; Saccharomyces cerevisiae/chemistry/physiology ; Saccharomyces cerevisiae Proteins/*chemistry/genetics/*metabolism
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    N- to C-terminal SNARE complex assembly promotes rapid membrane fusion (2006)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 2006-08-05
    Description: Assembly of the soluble N-ethylmaleimide-sensitive factor attachment protein receptors (SNAREs) syntaxin 1, SNAP-25, and synaptobrevin 2 is thought to be the driving force for the exocytosis of synaptic vesicles. However, whereas exocytosis is triggered at a millisecond time scale, the SNARE-mediated fusion of liposomes requires hours for completion, which challenges the idea of a key role for SNAREs in the final steps of exocytosis. We found that liposome fusion was dramatically accelerated when a stabilized syntaxin/SNAP-25 acceptor complex was used. Thus, SNAREs do have the capacity to execute fusion at a speed required for neuronal secretion, demonstrating that the maintenance of acceptor complexes is a critical step in biological fusion reactions.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Pobbati, Ajaybabu V -- Stein, Alexander -- Fasshauer, Dirk -- P01 GM072694/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 2006 Aug 4;313(5787):673-6.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Neurobiology, Max-Planck-Institute for Biophysical Chemistry, Am Fassberg 11, 37077 Gottingen, Germany.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/16888141" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Animals ; Binding Sites ; Circular Dichroism ; Dimerization ; Exocytosis ; Liposomes/*chemistry ; *Membrane Fusion ; Molecular Sequence Data ; Peptide Fragments/chemistry/metabolism ; Protein Binding ; Protein Folding ; Protein Structure, Secondary ; Qa-SNARE Proteins/chemistry/*metabolism ; R-SNARE Proteins/chemistry/metabolism ; Rats ; Synaptosomal-Associated Protein 25/chemistry/*metabolism
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    N-linked glycosylation of folded proteins by the bacterial oligosaccharyltransferase (2006)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 2006-11-18
    Description: N-linked protein glycosylation is found in all domains of life. In eukaryotes, it is the most abundant protein modification of secretory and membrane proteins, and the process is coupled to protein translocation and folding. We found that in bacteria, N-glycosylation can occur independently of the protein translocation machinery. In an in vitro assay, bacterial oligosaccharyltransferase glycosylated a folded endogenous substrate protein with high efficiency and folded bovine ribonuclease A with low efficiency. Unfolding the eukaryotic substrate greatly increased glycosylation. We propose that in the bacterial system, glycosylation sites are located in flexible parts of folded proteins, whereas the eukaryotic cotranslational glycosylation evolved to a mechanism presenting the substrate in a flexible form before folding.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Kowarik, Michael -- Numao, Shin -- Feldman, Mario F -- Schulz, Benjamin L -- Callewaert, Nico -- Kiermaier, Eva -- Catrein, Ina -- Aebi, Markus -- New York, N.Y. -- Science. 2006 Nov 17;314(5802):1148-50.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Institute of Microbiology, Department of Biology, Eidgenossische Technische Hochschule (ETH) Zurich, 8093 Zurich, Switzerland.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17110579" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Animals ; Bacterial Proteins/*metabolism ; Campylobacter jejuni ; Cattle ; Escherichia coli ; Glycoproteins/*metabolism ; Glycosylation ; Hexosyltransferases/metabolism ; Membrane Proteins/metabolism ; Molecular Sequence Data ; *Protein Folding ; Protein Transport ; Recombinant Proteins/metabolism
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    Dodeca-CLE peptides as suppressors of plant stem cell differentiation (2006)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 2006-08-12
    Description: In plants and animals, small peptide ligands that signal in cell-cell communication have been suggested to be a crucial component of development. A bioassay of single-cell transdifferentation demonstrates that a dodecapeptide with two hydroxyproline residues is the functional product of genes from the CLE family, which includes CLAVATA3 in Arabidopsis. The dodecapeptide suppresses xylem cell development at a concentration of 10(-11) M and promotes cell division. An application, corresponding to all 26 Arabidopsis CLE protein family members, of synthetic dodecapeptides reveals two counteracting signaling pathways involved in stem cell fate.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Ito, Yasuko -- Nakanomyo, Ikuko -- Motose, Hiroyasu -- Iwamoto, Kuninori -- Sawa, Shinichiro -- Dohmae, Naoshi -- Fukuda, Hiroo -- New York, N.Y. -- Science. 2006 Aug 11;313(5788):842-5.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Biological Sciences, Graduate School of Science, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/16902140" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Arabidopsis/cytology ; Arabidopsis Proteins/chemistry/metabolism ; Asteraceae/*cytology ; Base Sequence ; Biological Assay ; Cell Communication ; *Cell Differentiation ; Cells, Cultured ; Ligands ; Meristem/cytology ; Molecular Sequence Data ; Oligopeptides/chemistry/isolation & purification/*metabolism/pharmacology ; Plant Proteins/chemistry/*metabolism ; Plant Roots/cytology/growth & development ; Plant Structures/*cytology ; *Signal Transduction ; Stem Cells/*cytology
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    Virology. Clues to the virulence of H5N1 viruses in humans (2006)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 2006-03-18
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Krug, Robert M -- New York, N.Y. -- Science. 2006 Mar 17;311(5767):1562-3.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Institute for Cellular and Molecular Biology, University of Texas at Austin, Austin, TX 78712, USA. rkrug@mail.utexas.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/16543447" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Motifs ; Amino Acid Sequence ; Animals ; Birds/virology ; Hemagglutinin Glycoproteins, Influenza Virus/chemistry/immunology/metabolism ; Humans ; Influenza A Virus, H5N1 Subtype/chemistry/genetics/*pathogenicity ; Influenza A virus/genetics ; Influenza in Birds/virology ; Influenza, Human/*virology ; Interferon-beta/biosynthesis/genetics ; Protein Structure, Tertiary ; RNA Replicase/metabolism ; RNA, Double-Stranded/metabolism ; RNA, Messenger/metabolism ; RNA, Viral/genetics/metabolism ; Sequence Analysis, DNA ; Viral Nonstructural Proteins/*chemistry/*metabolism ; Viral Proteins/chemistry/genetics/metabolism ; Virulence ; Virulence Factors/*chemistry/*metabolism
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    Human lineage-specific amplification, selection, and neuronal expression of DUF1220 domains (2006)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 2006-09-02
    Description: Extreme gene duplication is a major source of evolutionary novelty. A genome-wide survey of gene copy number variation among human and great ape lineages revealed that the most striking human lineage-specific amplification was due to an unknown gene, MGC8902, which is predicted to encode multiple copies of a protein domain of unknown function (DUF1220). Sequences encoding these domains are virtually all primate-specific, show signs of positive selection, and are increasingly amplified generally as a function of a species' evolutionary proximity to humans, where the greatest number of copies (212) is found. DUF1220 domains are highly expressed in brain regions associated with higher cognitive function, and in brain show neuron-specific expression preferentially in cell bodies and dendrites.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Popesco, Magdalena C -- Maclaren, Erik J -- Hopkins, Janet -- Dumas, Laura -- Cox, Michael -- Meltesen, Lynne -- McGavran, Loris -- Wyckoff, Gerald J -- Sikela, James M -- AA11853/AA/NIAAA NIH HHS/ -- New York, N.Y. -- Science. 2006 Sep 1;313(5791):1304-7.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Human Medical Genetics, University of Colorado at Denver and Health Sciences Center, Aurora, CO 80045, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/16946073" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Animals ; *Biological Evolution ; Brain/*metabolism ; Cognition ; Exons ; *Gene Amplification ; Gene Dosage ; Gene Duplication ; Gene Expression ; Genome, Human ; Humans ; Macaca mulatta/genetics ; Mice ; Molecular Sequence Data ; Neocortex/metabolism ; Neurons/*metabolism ; Pan troglodytes/genetics ; Phylogeny ; Polymerase Chain Reaction ; *Protein Structure, Tertiary ; Proteins/*chemistry/genetics ; Rats ; *Selection, Genetic
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    Brassinosteroids regulate dissociation of BKI1, a negative regulator of BRI1 signaling, from the plasma membrane (2006)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 2006-07-22
    Description: Brassinosteroids, the steroid hormones of plants, are perceived at the plasma membrane by a leucine-rich repeat receptor serine/threonine kinase called BRI1. We report a BRI1-interacting protein, BKI1, which is a negative regulator of brassinosteroid signaling. Brassinosteroids cause the rapid dissociation of BKI1-yellow fluorescent protein from the plasma membrane in a process that is dependent on BRI1-kinase. BKI1 is a substrate of BRI1 kinase and limits the interaction of BRI1 with its proposed coreceptor, BAK1, suggesting that BKI1 prevents the activation of BRI1.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Wang, Xuelu -- Chory, Joanne -- New York, N.Y. -- Science. 2006 Aug 25;313(5790):1118-22. Epub 2006 Jul 20.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Howard Hughes Medical Institute and Plant Biology Laboratory, Salk Institute for Biological Studies, 10010 North Torrey Pines Road, La Jolla, CA 92037, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/16857903" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Arabidopsis/*metabolism ; Arabidopsis Proteins/chemistry/genetics/*metabolism ; Brassinosteroids ; Cell Membrane/*metabolism ; Cholestanols/*metabolism/pharmacology ; Gene Expression Regulation, Plant ; Meristem/metabolism ; Molecular Sequence Data ; Nuclear Proteins/metabolism ; Phosphorylation ; Plants, Genetically Modified ; Protein Binding ; Protein Kinases/chemistry/genetics/*metabolism ; Protein Structure, Tertiary ; RNA Interference ; Recombinant Fusion Proteins/metabolism ; *Signal Transduction ; Steroids, Heterocyclic/*metabolism/pharmacology ; Two-Hybrid System Techniques
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    Functional CpG methylation system in a social insect (2006)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2006-10-28
    Description: DNA methylation systems are well characterized in vertebrates, but methylation in Drosophila melanogaster and other invertebrates remains controversial. Using the recently sequenced honey bee genome, we present a bioinformatic, molecular, and biochemical characterization of a functional DNA methylation system in an insect. We report on catalytically active orthologs of the vertebrate DNA methyltransferases Dnmt1 and Dnmt3a and b, two isoforms that contain a methyl-DNA binding domain, genomic 5-methyl-deoxycytosine, and CpG-methylated genes. The honey bee provides an opportunity to study the roles of methylation in social contexts.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Wang, Ying -- Jorda, Mireia -- Jones, Peter L -- Maleszka, Ryszard -- Ling, Xu -- Robertson, Hugh M -- Mizzen, Craig A -- Peinado, Miguel A -- Robinson, Gene E -- New York, N.Y. -- Science. 2006 Oct 27;314(5799):645-7.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Cell and Developmental Biology, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17068262" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Animals ; Base Composition ; Bees/enzymology/*genetics/*metabolism ; Computational Biology ; DNA/chemistry/metabolism ; DNA (Cytosine-5-)-Methyltransferase/chemistry/*genetics/*metabolism ; *DNA Methylation ; DNA-Binding Proteins/genetics/metabolism ; Dinucleoside Phosphates/*metabolism ; Genes, Insect ; Genome, Insect ; Insect Proteins/genetics/metabolism ; Molecular Sequence Data
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    Structure and receptor specificity of the hemagglutinin from an H5N1 influenza virus (2006)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2006-03-18
    Description: The hemagglutinin (HA) structure at 2.9 angstrom resolution, from a highly pathogenic Vietnamese H5N1 influenza virus, is more related to the 1918 and other human H1 HAs than to a 1997 duck H5 HA. Glycan microarray analysis of this Viet04 HA reveals an avian alpha2-3 sialic acid receptor binding preference. Introduction of mutations that can convert H1 serotype HAs to human alpha2-6 receptor specificity only enhanced or reduced affinity for avian-type receptors. However, mutations that can convert avian H2 and H3 HAs to human receptor specificity, when inserted onto the Viet04 H5 HA framework, permitted binding to a natural human alpha2-6 glycan, which suggests a path for this H5N1 virus to gain a foothold in the human population.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Stevens, James -- Blixt, Ola -- Tumpey, Terrence M -- Taubenberger, Jeffery K -- Paulson, James C -- Wilson, Ian A -- AI058113/AI/NIAID NIH HHS/ -- AI42266/AI/NIAID NIH HHS/ -- CA55896/CA/NCI NIH HHS/ -- GM060938/GM/NIGMS NIH HHS/ -- GM062116/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 2006 Apr 21;312(5772):404-10. Epub 2006 Mar 16.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Molecular Biology, Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, CA 92037, USA. jstevens@scripps.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/16543414" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Amino Acid Substitution ; Animals ; Antigenic Variation ; Binding Sites ; Birds ; Carbohydrate Conformation ; Cloning, Molecular ; Crystallography, X-Ray ; Glycosylation ; Hemagglutinin Glycoproteins, Influenza ; Virus/*chemistry/genetics/immunology/*metabolism ; Humans ; Influenza A Virus, H5N1 Subtype/*chemistry/genetics/metabolism/*pathogenicity ; Lung/virology ; Models, Molecular ; Molecular Sequence Data ; Mutation ; Polysaccharides/metabolism ; Protein Conformation ; Protein Folding ; Protein Structure, Tertiary ; Receptors, Virus/chemistry/*metabolism ; Respiratory Mucosa/virology ; Sialic Acids/chemistry/metabolism ; Species Specificity ; Virulence
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    Preserved CD4+ central memory T cells and survival in vaccinated SIV-challenged monkeys (2006)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2006-06-10
    Description: Vaccine-induced cellular immunity controls virus replication in simian immunodeficiency virus (SIV)-infected monkeys only transiently, leading to the question of whether such vaccines for AIDS will be effective. We immunized monkeys with plasmid DNA and replication-defective adenoviral vectors encoding SIV proteins and then challenged them with pathogenic SIV. Although these monkeys demonstrated a reduction in viremia restricted to the early phase of SIV infection, they showed a prolonged survival. This survival was associated with preserved central memory CD4+ T lymphocytes and could be predicted by the magnitude of the vaccine-induced cellular immune response. These immune correlates of vaccine efficacy should guide the evaluation of AIDS vaccines in humans.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2365913/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2365913/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Letvin, Norman L -- Mascola, John R -- Sun, Yue -- Gorgone, Darci A -- Buzby, Adam P -- Xu, Ling -- Yang, Zhi-Yong -- Chakrabarti, Bimal -- Rao, Srinivas S -- Schmitz, Jorn E -- Montefiori, David C -- Barker, Brianne R -- Bookstein, Fred L -- Nabel, Gary J -- Z99 AI999999/Intramural NIH HHS/ -- New York, N.Y. -- Science. 2006 Jun 9;312(5779):1530-3.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Vaccine Research Center, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD 20892, USA. nletvin@bidmc.harvard.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/16763152" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Animals ; CD4-Positive T-Lymphocytes/*immunology ; Humans ; *Immunologic Memory ; Macaca mulatta ; Molecular Sequence Data ; Plasmids ; SAIDS Vaccines/*immunology ; Simian Acquired Immunodeficiency Syndrome/*immunology/prevention & control ; Simian Immunodeficiency Virus/*immunology ; Survival Analysis ; Vaccines, DNA/*immunology ; Vaccines, Synthetic/immunology ; Virus Replication
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    Crystal structure of the low-pH form of the vesicular stomatitis virus glycoprotein G (2006)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2006-07-15
    Description: The vesicular stomatitis virus has an atypical membrane fusion glycoprotein (G) exhibiting a pH-dependent equilibrium between two forms at the virus surface. Membrane fusion is triggered during the transition from the high- to low-pH form. The structure of G in its low-pH form shows the classic hairpin conformation observed in all other fusion proteins in their postfusion conformation, in spite of a novel fold combining features of fusion proteins from classes I and II. The structure provides a framework for understanding the reversibility of the G conformational change. Unexpectedly, G is homologous to gB of herpesviruses, which raises important questions on viral evolution.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Roche, Stephane -- Bressanelli, Stephane -- Rey, Felix A -- Gaudin, Yves -- New York, N.Y. -- Science. 2006 Jul 14;313(5784):187-91.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉CNRS, Unite Mixte de Recherche (UMR) 2472, Institut Federatif de Recherche (IFR) 115, Virologie Moleculaire et Structurale, 91198, Gif sur Yvette, France.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/16840692" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Crystallization ; Crystallography, X-Ray ; Evolution, Molecular ; Hydrogen-Ion Concentration ; Membrane Glycoproteins/*chemistry/genetics/metabolism ; Models, Molecular ; Molecular Sequence Data ; Mutation ; Protein Conformation ; Protein Folding ; Protein Structure, Quaternary ; Protein Structure, Secondary ; Protein Structure, Tertiary ; Protein Subunits/chemistry ; Vesicular stomatitis Indiana virus/*chemistry ; Viral Envelope Proteins/*chemistry/genetics/metabolism ; Viral Fusion Proteins/*chemistry/genetics/metabolism
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    Ubiquitinated TDP-43 in frontotemporal lobar degeneration and amyotrophic lateral sclerosis (2006)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 2006-10-07
    Description: Ubiquitin-positive, tau- and alpha-synuclein-negative inclusions are hallmarks of frontotemporal lobar degeneration with ubiquitin-positive inclusions and amyotrophic lateral sclerosis. Although the identity of the ubiquitinated protein specific to either disorder was unknown, we showed that TDP-43 is the major disease protein in both disorders. Pathologic TDP-43 was hyper-phosphorylated, ubiquitinated, and cleaved to generate C-terminal fragments and was recovered only from affected central nervous system regions, including hippocampus, neocortex, and spinal cord. TDP-43 represents the common pathologic substrate linking these neurodegenerative disorders.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Neumann, Manuela -- Sampathu, Deepak M -- Kwong, Linda K -- Truax, Adam C -- Micsenyi, Matthew C -- Chou, Thomas T -- Bruce, Jennifer -- Schuck, Theresa -- Grossman, Murray -- Clark, Christopher M -- McCluskey, Leo F -- Miller, Bruce L -- Masliah, Eliezer -- Mackenzie, Ian R -- Feldman, Howard -- Feiden, Wolfgang -- Kretzschmar, Hans A -- Trojanowski, John Q -- Lee, Virginia M-Y -- AG10124/AG/NIA NIH HHS/ -- AG17586/AG/NIA NIH HHS/ -- T32 AG00255/AG/NIA NIH HHS/ -- New York, N.Y. -- Science. 2006 Oct 6;314(5796):130-3.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Center for Neurodegenerative Disease Research, Department of Pathology and Laboratory Medicine, University of Pennsylvania School of Medicine, Philadelphia, PA 19104, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17023659" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Amyotrophic Lateral Sclerosis/*metabolism/pathology ; Antibodies, Monoclonal ; *Brain Chemistry ; Cerebral Cortex/chemistry/pathology ; DNA-Binding Proteins/*analysis/chemistry/genetics/immunology ; Dementia/genetics/*metabolism/pathology ; Fluorescent Antibody Technique ; Hippocampus/chemistry/pathology ; Humans ; Immunoblotting ; Molecular Sequence Data ; Motor Neurons/chemistry/pathology ; Neurons/chemistry/pathology ; Peptide Fragments/chemistry ; Phosphorylation ; Spinal Cord/*chemistry/pathology ; Ubiquitin/*analysis
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    RNA recognition and cleavage by a splicing endonuclease (2006)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 2006-05-13
    Description: The RNA splicing endonuclease cleaves two phosphodiester bonds within folded precursor RNAs during intron removal, producing the functional RNAs required for protein synthesis. Here we describe at a resolution of 2.85 angstroms the structure of a splicing endonuclease from Archaeglobus fulgidus bound with a bulge-helix-bulge RNA containing a noncleaved and a cleaved splice site. The endonuclease dimer cooperatively recognized a flipped-out bulge base and stabilizes sharply bent bulge backbones that are poised for an in-line RNA cleavage reaction. Cooperativity arises because an arginine pair from one catalytic domain sandwiches a nucleobase within the bulge cleaved by the other catalytic domain.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Xue, Song -- Calvin, Kate -- Li, Hong -- New York, N.Y. -- Science. 2006 May 12;312(5775):906-10.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Chemistry and Biochemistry, Institute of Molecular Biophysics, Florida State University, Tallahassee, FL 32306, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/16690865" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Archaeal Proteins/chemistry/metabolism ; Archaeoglobus fulgidus/*enzymology ; Binding Sites ; Catalytic Domain ; Crystallography, X-Ray ; Dimerization ; Endoribonucleases/*chemistry/*metabolism ; Hydrogen Bonding ; Introns ; Models, Molecular ; Molecular Sequence Data ; Nucleic Acid Conformation ; Protein Conformation ; Protein Subunits/chemistry/metabolism ; RNA Precursors/*chemistry/*metabolism ; *RNA Splicing ; RNA, Archaeal/chemistry/metabolism ; RNA, Transfer/chemistry/metabolism
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    Community genomics among stratified microbial assemblages in the ocean's interior (2006)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2006-01-28
    Description: Microbial life predominates in the ocean, yet little is known about its genomic variability, especially along the depth continuum. We report here genomic analyses of planktonic microbial communities in the North Pacific Subtropical Gyre, from the ocean's surface to near-sea floor depths. Sequence variation in microbial community genes reflected vertical zonation of taxonomic groups, functional gene repertoires, and metabolic potential. The distributional patterns of microbial genes suggested depth-variable community trends in carbon and energy metabolism, attachment and motility, gene mobility, and host-viral interactions. Comparative genomic analyses of stratified microbial communities have the potential to provide significant insight into higher-order community organization and dynamics.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉DeLong, Edward F -- Preston, Christina M -- Mincer, Tracy -- Rich, Virginia -- Hallam, Steven J -- Frigaard, Niels-Ulrik -- Martinez, Asuncion -- Sullivan, Matthew B -- Edwards, Robert -- Brito, Beltran Rodriguez -- Chisholm, Sallie W -- Karl, David M -- New York, N.Y. -- Science. 2006 Jan 27;311(5760):496-503.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Massachusetts Institute of Technology, Cambridge, MA 02139, USA. delong@mit.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/16439655" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Archaea/classification/*genetics/metabolism ; Archaeal Proteins/chemistry/genetics/metabolism ; Bacteria/classification/*genetics/metabolism ; Bacterial Proteins/chemistry/genetics/metabolism ; Bacteriophages/genetics ; Base Sequence ; Cloning, Molecular ; Cluster Analysis ; Computational Biology ; Cosmids ; DNA, Viral/chemistry/genetics ; Ecosystem ; Gene Library ; *Genes, Archaeal ; *Genes, Bacterial ; Genes, rRNA ; *Genomics ; Molecular Sequence Data ; Pacific Ocean ; Seawater/*microbiology ; Sequence Analysis, DNA ; Water Microbiology
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    AXR4 is required for localization of the auxin influx facilitator AUX1 (2006)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2006-05-13
    Description: The AUX1 and PIN auxin influx and efflux facilitators are key regulators of root growth and development. For root gravitropism to occur, AUX1 and PIN2 must transport auxin via the lateral root cap to elongating epidermal cells. Genetic studies suggest that AXR4 functions in the same pathway as AUX1. Here we show that AXR4 is a previously unidentified accessory protein of the endoplasmic reticulum (ER) that regulates localization of AUX1 but not of PIN proteins. Loss of AXR4 resulted in abnormal accumulation of AUX1 in the ER of epidermal cells, indicating that the axr4 agravitropic phenotype is caused by defective AUX1 trafficking in the root epidermis.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Dharmasiri, S -- Swarup, R -- Mockaitis, K -- Dharmasiri, N -- Singh, S K -- Kowalchyk, M -- Marchant, A -- Mills, S -- Sandberg, G -- Bennett, M J -- Estelle, M -- New York, N.Y. -- Science. 2006 May 26;312(5777):1218-20. Epub 2006 May 11.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Biology, Indiana University, Bloomington, IN 47405, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/16690816" target="_blank"〉PubMed〈/a〉
    Keywords: 2,4-Dichlorophenoxyacetic Acid/pharmacology ; Amino Acid Sequence ; Arabidopsis/drug effects/*genetics/*metabolism ; Arabidopsis Proteins/chemistry/*genetics/*metabolism ; Biological Transport ; Carrier Proteins/chemistry/*genetics/*metabolism ; Cell Membrane/metabolism ; Endoplasmic Reticulum/metabolism ; Gravitropism ; Herbicides/pharmacology ; Indoleacetic Acids/metabolism ; Membrane Transport Proteins/metabolism ; Molecular Sequence Data ; Mutation ; Oligonucleotide Array Sequence Analysis ; Phenotype ; Plant Epidermis/cytology/metabolism ; Plant Root Cap/cytology/metabolism ; Plant Roots/*metabolism ; Plants, Genetically Modified ; Protein Transport ; Recombinant Fusion Proteins/metabolism
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    Action of TFII-I outside the nucleus as an inhibitor of agonist-induced calcium entry (2006)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 2006-10-07
    Description: TFII-I is a transcription factor and a target of phosphorylation by Bruton's tyrosine kinase. In humans, deletions spanning the TFII-I locus are associated with a cognitive defect, the Williams-Beuren cognitive profile. We report an unanticipated role of TFII-I outside the nucleus as a negative regulator of agonist-induced calcium entry (ACE) that suppresses surface accumulation of TRPC3 (transient receptor potential C3) channels. Inhibition of ACE by TFII-I requires phosphotyrosine residues that engage the SH2 (Src-homology 2) domains of phospholipase C-g (PLC-g) and an interrupted, pleckstrin homology (PH)-like domain that binds the split PH domain of PLC-g. Our observations suggest a model in which TFII-I suppresses ACE by competing with TRPC3 for binding to PLC-g.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Caraveo, Gabriela -- van Rossum, Damian B -- Patterson, Randen L -- Snyder, Solomon H -- Desiderio, Stephen -- New York, N.Y. -- Science. 2006 Oct 6;314(5796):122-5.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Molecular Biology and Genetics, Institute for Cell Engineering, Johns Hopkins University School of Medicine, Baltimore, MD 21205, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17023658" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Animals ; Bradykinin/pharmacology ; Calcium/*metabolism ; Calcium Channels/*metabolism ; Cell Line ; Cell Membrane/metabolism ; Cytoplasm/metabolism ; Humans ; Models, Biological ; Molecular Sequence Data ; PC12 Cells ; Phospholipase C gamma/chemistry/*metabolism ; Phosphorylation ; Protein Binding ; Protein Structure, Tertiary ; Rats ; TRPC Cation Channels/*metabolism ; Transcription Factors, TFII/chemistry/*metabolism ; Uridine Triphosphate/pharmacology ; src Homology Domains
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    Parietal-eye phototransduction components and their potential evolutionary implications (2006)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 2006-03-18
    Description: The parietal-eye photoreceptor is unique because it has two antagonistic light signaling pathways in the same cell-a hyperpolarizing pathway maximally sensitive to blue light and a depolarizing pathway maximally sensitive to green light. Here, we report the molecular components of these two pathways. We found two opsins in the same cell: the blue-sensitive pinopsin and a previously unidentified green-sensitive opsin, which we name parietopsin. Signaling components included gustducin-alpha and Galphao, but not rod or cone transducin-alpha. Single-cell recordings demonstrated that Go mediates the depolarizing response. Gustducin-alpha resembles transducin-alpha functionally and likely mediates the hyperpolarizing response. The parietopsin-Go signaling pair provides clues about how rod and cone phototransduction might have evolved.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Su, Chih-Ying -- Luo, Dong-Gen -- Terakita, Akihisa -- Shichida, Yoshinori -- Liao, Hsi-Wen -- Kazmi, Manija A -- Sakmar, Thomas P -- Yau, King-Wai -- EY06837/EY/NEI NIH HHS/ -- R01 DC006904/DC/NIDCD NIH HHS/ -- R01 DC006904-01/DC/NIDCD NIH HHS/ -- R01 DC006904-02/DC/NIDCD NIH HHS/ -- R01 EY006837/EY/NEI NIH HHS/ -- R01 EY006837-16A1/EY/NEI NIH HHS/ -- R01 EY006837-17/EY/NEI NIH HHS/ -- R01 EY006837-18/EY/NEI NIH HHS/ -- R01 EY006837-19/EY/NEI NIH HHS/ -- R01 EY014596/EY/NEI NIH HHS/ -- R01 EY014596-01/EY/NEI NIH HHS/ -- R01 EY014596-02/EY/NEI NIH HHS/ -- R01 EY014596-03/EY/NEI NIH HHS/ -- R01 EY014596-04/EY/NEI NIH HHS/ -- R37 EY006837/EY/NEI NIH HHS/ -- R37 EY006837-15S1/EY/NEI NIH HHS/ -- New York, N.Y. -- Science. 2006 Mar 17;311(5767):1617-21.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Neuroscience, Johns Hopkins University School of Medicine, Baltimore, MD 21205, USA. chih-ying.su@yale.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/16543463" target="_blank"〉PubMed〈/a〉
    Keywords: 3',5'-Cyclic-GMP Phosphodiesterases/metabolism ; Amino Acid Sequence ; Animals ; *Biological Evolution ; Cell Line ; Cyclic GMP/metabolism ; GTP-Binding Protein alpha Subunits/genetics/physiology ; Humans ; Lizards/genetics/*physiology ; Molecular Sequence Data ; *Ocular Physiological Phenomena ; Patch-Clamp Techniques ; Photoreceptor Cells, Vertebrate/chemistry/*physiology ; Rod Opsins/analysis/genetics/*physiology ; Transducin/genetics/physiology ; *Vision, Ocular
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    Nuclear receptor Rev-erbalpha is a critical lithium-sensitive component of the circadian clock (2006)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 2006-02-18
    Description: Lithium is commonly used to treat bipolar disorder, which is associated with altered circadian rhythm. Lithium is a potent inhibitor of glycogen synthase kinase 3 (GSK3), which regulates circadian rhythm in several organisms. In experiments with cultured cells, we show here that GSK3beta phosphorylates and stabilizes the orphan nuclear receptor Rev-erbalpha, a negative component of the circadian clock. Lithium treatment of cells leads to rapid proteasomal degradation of Rev-erbalpha and activation of clock gene Bmal1. A form of Rev-erbalpha that is insensitive to lithium interferes with the expression of circadian genes. Control of Rev-erbalpha protein stability is thus a critical component of the peripheral clock and a biological target of lithium therapy.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Yin, Lei -- Wang, Jing -- Klein, Peter S -- Lazar, Mitchell A -- DK 19525/DK/NIDDK NIH HHS/ -- DK45586/DK/NIDDK NIH HHS/ -- MH058324/MH/NIMH NIH HHS/ -- R01 MH058324/MH/NIMH NIH HHS/ -- R01 MH058324-07/MH/NIMH NIH HHS/ -- R01 MH058324-08/MH/NIMH NIH HHS/ -- New York, N.Y. -- Science. 2006 Feb 17;311(5763):1002-5.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Division of Endocrinology, Diabetes, and Metabolism, and University of Pennsylvania School of Medicine, 415 Curie Boulevard, Philadelphia, PA 19104, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/16484495" target="_blank"〉PubMed〈/a〉
    Keywords: ARNTL Transcription Factors ; Amino Acid Sequence ; Animals ; Basic Helix-Loop-Helix Transcription Factors/genetics/metabolism ; Biological Clocks/*physiology ; Cell Line ; Cell Line, Tumor ; Circadian Rhythm/*physiology ; DNA-Binding Proteins/chemistry/genetics/*metabolism ; Down-Regulation ; Gene Expression Regulation ; Glycogen Synthase Kinase 3/antagonists & inhibitors/metabolism ; Humans ; Lithium Chloride/*pharmacology ; Mice ; Molecular Sequence Data ; NIH 3T3 Cells ; Nuclear Receptor Subfamily 1, Group D, Member 1 ; Phosphorylation ; Promoter Regions, Genetic ; Proteasome Endopeptidase Complex/metabolism ; Proteasome Inhibitors ; Receptors, Cytoplasmic and Nuclear/chemistry/genetics/*metabolism
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    Structure of the multidrug transporter EmrD from Escherichia coli (2006)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2006-05-06
    Description: EmrD is a multidrug transporter from the Major Facilitator Superfamily that expels amphipathic compounds across the inner membrane of Escherichia coli. Here, we report the x-ray structure of EmrD determined to a resolution of 3.5 angstroms. The structure reveals an interior that is composed mostly of hydrophobic residues, which is consistent with its role transporting amphipathic molecules. Two long loops extend into the inner leaflet side of the cell membrane. This region can serve to recognize and bind substrate directly from the lipid bilayer. We propose that multisubstrate specificity, binding, and transport are facilitated by these loop regions and the internal cavity.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3152482/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3152482/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Yin, Yong -- He, Xiao -- Szewczyk, Paul -- Nguyen, That -- Chang, Geoffrey -- GM65798/GM/NIGMS NIH HHS/ -- GM70480/GM/NIGMS NIH HHS/ -- R21 GM065798/GM/NIGMS NIH HHS/ -- R21 GM065798-01/GM/NIGMS NIH HHS/ -- R21 GM065798-02/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 2006 May 5;312(5774):741-4.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Scripps Research Institute, Department of Molecular Biology, 10550 North Torrey Pines Road, CB-105, La Jolla, CA 92037, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/16675700" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Biological Transport ; Carbonyl Cyanide m-Chlorophenyl Hydrazone/metabolism ; Cell Membrane/chemistry ; Crystallography, X-Ray ; Cytoplasm/chemistry ; Dimerization ; Drug Resistance, Multiple, Bacterial ; Escherichia coli/*chemistry/drug effects ; Escherichia coli Proteins/*chemistry/metabolism ; Hydrophobic and Hydrophilic Interactions ; Lipid Bilayers ; Membrane Transport Proteins/*chemistry/metabolism ; Models, Molecular ; Molecular Sequence Data ; Protein Conformation ; Protein Structure, Secondary ; Substrate Specificity
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    Crystal structure of the rabies virus nucleoprotein-RNA complex (2006)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2006-06-17
    Description: Negative-strand RNA viruses condense their genome into a helical nucleoprotein-RNA complex, the nucleocapsid, which is packed into virions and serves as a template for the RNA-dependent RNA polymerase complex. The crystal structure of a recombinant rabies virus nucleoprotein-RNA complex, organized in an undecameric ring, has been determined at 3.5 angstrom resolution. Polymerization of the nucleoprotein is achieved by domain exchange between protomers, with flexible hinges allowing nucleocapsid formation. The two core domains of the nucleoprotein clamp around the RNA at their interface and shield it from the environment. RNA sequestering by nucleoproteins is likely a common mechanism used by negative-strand RNA viruses to protect their genomes from the innate immune response directed against viral RNA in human host cells at certain stages of an infectious cycle.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Albertini, Aurelie A V -- Wernimont, Amy K -- Muziol, Tadeusz -- Ravelli, Raimond B G -- Clapier, Cedric R -- Schoehn, Guy -- Weissenhorn, Winfried -- Ruigrok, Rob W H -- New York, N.Y. -- Science. 2006 Jul 21;313(5785):360-3. Epub 2006 Jun 15.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Institut de Virologie Moleculaire et Structurale, FRE 2854 Universite Joseph Fourier-CNRS, Boite Postale 181, 38042 Grenoble, France.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/16778023" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Crystallography, X-Ray ; DNA-Directed RNA Polymerases/metabolism ; Genome, Viral ; Models, Molecular ; Molecular Sequence Data ; Nucleic Acid Conformation ; Nucleocapsid Proteins/*chemistry/metabolism ; Phosphoproteins/metabolism ; Phosphorylation ; Protein Conformation ; Protein Folding ; Protein Structure, Quaternary ; Protein Structure, Secondary ; Protein Structure, Tertiary ; Protein Subunits/chemistry ; RNA, Viral/*chemistry/genetics/metabolism ; Rabies virus/*chemistry/genetics ; Recombinant Proteins/chemistry ; Ribonucleoproteins/*chemistry
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    Polymorphic secreted kinases are key virulence factors in toxoplasmosis (2006)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2006-12-16
    Description: The majority of known Toxoplasma gondii isolates from Europe and North America belong to three clonal lines that differ dramatically in their virulence, depending on the host. To identify the responsible genes, we mapped virulence in F(1) progeny derived from crosses between type II and type III strains, which we introduced into mice. Five virulence (VIR) loci were thus identified, and for two of these, genetic complementation showed that a predicted protein kinase (ROP18 and ROP16, respectively) is the key molecule. Both are hypervariable rhoptry proteins that are secreted into the host cell upon invasion. These results suggest that secreted kinases unique to the Apicomplexa are crucial in the host-pathogen interaction.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2646183/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2646183/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Saeij, J P J -- Boyle, J P -- Coller, S -- Taylor, S -- Sibley, L D -- Brooke-Powell, E T -- Ajioka, J W -- Boothroyd, J C -- 1R01AI045806-01A1/AI/NIAID NIH HHS/ -- AI05093/AI/NIAID NIH HHS/ -- AI059176/AI/NIAID NIH HHS/ -- AI21423/AI/NIAID NIH HHS/ -- AI30230/AI/NIAID NIH HHS/ -- AI36629/AI/NIAID NIH HHS/ -- AI41014/AI/NIAID NIH HHS/ -- F32AI60306/AI/NIAID NIH HHS/ -- R01 AI021423/AI/NIAID NIH HHS/ -- R01 AI021423-20/AI/NIAID NIH HHS/ -- R01 AI036629/AI/NIAID NIH HHS/ -- Wellcome Trust/United Kingdom -- New York, N.Y. -- Science. 2006 Dec 15;314(5806):1780-3.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Microbiology and Immunology, Stanford University School of Medicine, Stanford, CA 94305, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17170306" target="_blank"〉PubMed〈/a〉
    Keywords: Alleles ; Amino Acid Sequence ; Animals ; Chromosome Mapping ; Chromosomes/genetics ; Crosses, Genetic ; Female ; Genes, Protozoan ; Genetic Complementation Test ; Mice ; Mice, Inbred BALB C ; Mice, Inbred CBA ; Molecular Sequence Data ; Oligonucleotide Array Sequence Analysis ; *Polymorphism, Single Nucleotide ; Protozoan Proteins/chemistry/*genetics/metabolism ; Quantitative Trait Loci ; Toxoplasma/enzymology/*genetics/*pathogenicity ; Toxoplasmosis, Animal/*parasitology ; Virulence ; Virulence Factors/chemistry/*genetics/metabolism
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    A secreted serine-threonine kinase determines virulence in the eukaryotic pathogen Toxoplasma gondii (2006)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2006-12-16
    Description: Toxoplasma gondii strains differ dramatically in virulence despite being genetically very similar. Genetic mapping revealed two closely adjacent quantitative trait loci on parasite chromosome VIIa that control the extreme virulence of the type I lineage. Positional cloning identified the candidate virulence gene ROP18, a highly polymorphic serine-threonine kinase that was secreted into the host cell during parasite invasion. Transfection of the virulent ROP18 allele into a nonpathogenic type III strain increased growth and enhanced mortality by 4 to 5 logs. These attributes of ROP18 required kinase activity, which revealed that secretion of effectors is a major component of parasite virulence.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Taylor, S -- Barragan, A -- Su, C -- Fux, B -- Fentress, S J -- Tang, K -- Beatty, W L -- Hajj, H El -- Jerome, M -- Behnke, M S -- White, M -- Wootton, J C -- Sibley, L D -- AI059176/AI/NIAID NIH HHS/ -- AI36629/AI/NIAID NIH HHS/ -- AI44600/AI/NIAID NIH HHS/ -- P20 RR-020185/RR/NCRR NIH HHS/ -- Intramural NIH HHS/ -- New York, N.Y. -- Science. 2006 Dec 15;314(5806):1776-80.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Molecular Microbiology, Washington University School of Medicine, St. Louis, MO 63130, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17170305" target="_blank"〉PubMed〈/a〉
    Keywords: Alleles ; Amino Acid Sequence ; Animals ; Animals, Genetically Modified ; Catalytic Domain ; Chromosome Mapping ; Chromosomes/genetics ; Cloning, Molecular ; Genes, Protozoan ; Mice ; Molecular Sequence Data ; Movement ; Point Mutation ; Protein-Serine-Threonine Kinases/chemistry/genetics/*metabolism ; Protozoan Proteins/chemistry/genetics/*metabolism ; Quantitative Trait Loci ; Toxoplasma/*enzymology/genetics/growth & development/*pathogenicity ; Toxoplasmosis, Animal/mortality/parasitology ; Transfection ; Virulence/genetics ; Virulence Factors/chemistry/genetics/*metabolism
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    Chemistry. Mass spectrometry: bottom-up or top-down? (2006)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2006-10-07
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Chait, Brian T -- New York, N.Y. -- Science. 2006 Oct 6;314(5796):65-6.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Laboratory for Mass Spectrometry and Gaseous Ion Chemistry, Rockefeller University, New York, NY 10021, USA. chait@rockefeller.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17023639" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Mass Spectrometry/*methods ; Molecular Weight ; Peptide Fragments/chemistry ; Protein Conformation ; Proteins/*chemistry/isolation & purification ; Proteomics ; Spectrometry, Mass, Electrospray Ionization/*methods ; Spectrometry, Mass, Matrix-Assisted Laser Desorption-Ionization
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    Crystal structure of glycoprotein B from herpes simplex virus 1 (2006)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2006-07-15
    Description: Glycoprotein B (gB) is the most conserved component of the complex cell-entry machinery of herpes viruses. A crystal structure of the gB ectodomain from herpes simplex virus type 1 reveals a multidomain trimer with unexpected homology to glycoprotein G from vesicular stomatitis virus (VSV G). An alpha-helical coiled-coil core relates gB to class I viral membrane fusion glycoproteins; two extended beta hairpins with hydrophobic tips, homologous to fusion peptides in VSV G, relate gB to class II fusion proteins. Members of both classes accomplish fusion through a large-scale conformational change, triggered by a signal from a receptor-binding component. The domain connectivity within a gB monomer would permit such a rearrangement, including long-range translocations linked to viral and cellular membranes.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Heldwein, Ekaterina E -- Lou, Huan -- Bender, Florent C -- Cohen, Gary H -- Eisenberg, Roselyn J -- Harrison, Stephen C -- AI049980/AI/NIAID NIH HHS/ -- AI056045/AI/NIAID NIH HHS/ -- AI065886/AI/NIAID NIH HHS/ -- NS36731/NS/NINDS NIH HHS/ -- R21 AI065886/AI/NIAID NIH HHS/ -- New York, N.Y. -- Science. 2006 Jul 14;313(5784):217-20.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Biological Chemistry and Molecular Pharmacology, Harvard Medical School, 320 Longwood Avenue, Boston, MA 02115, USA. heldwein@crystal.harvard.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/16840698" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Crystallization ; Crystallography, X-Ray ; Epitopes ; Evolution, Molecular ; Herpesvirus 1, Human/*chemistry ; Hydrogen-Ion Concentration ; Hydrophobic and Hydrophilic Interactions ; Membrane Glycoproteins/chemistry/physiology ; Models, Molecular ; Molecular Sequence Data ; Protein Conformation ; Protein Folding ; Protein Structure, Secondary ; Protein Structure, Tertiary ; Protein Subunits/chemistry ; Vesicular stomatitis Indiana virus/chemistry ; Viral Envelope Proteins/*chemistry/immunology/physiology ; Viral Fusion Proteins/*chemistry
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    C-terminal signal sequence promotes virulence factor secretion in Mycobacterium tuberculosis (2006)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2006-09-16
    Description: Mycobacterium tuberculosis uses the ESX-1/Snm system [early secreted antigen 6 kilodaltons (ESAT-6) system 1/secretion in mycobacteria] to deliver virulence factors into host macrophages during infection. Despite its essential role in virulence, the mechanism of ESX-1 secretion is unclear. We found that the unstructured C terminus of the CFP-10 substrate was recognized by Rv3871, a cytosolic component of the ESX-1 system that itself interacts with the membrane protein Rv3870. Point mutations in the signal that abolished binding of CFP-10 to Rv3871 prevented secretion of the CFP-10 (culture filtrate protein, 10 kilodaltons)/ESAT-6 virulence factor complex. Attachment of the signal to yeast ubiquitin was sufficient for secretion from M. tuberculosis cells, demonstrating that this ESX-1 signal is portable.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Champion, Patricia A Digiuseppe -- Stanley, Sarah A -- Champion, Matthew M -- Brown, Eric J -- Cox, Jeffery S -- A105155/PHS HHS/ -- AI51667/AI/NIAID NIH HHS/ -- AI63302/AI/NIAID NIH HHS/ -- New York, N.Y. -- Science. 2006 Sep 15;313(5793):1632-6.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Microbiology and Immunology, University of California, San Francisco, 600 16th Street, Campus Box 2200, San Francisco, CA 94143-2200, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/16973880" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Antigens, Bacterial/chemistry/*metabolism ; Bacterial Proteins/chemistry/genetics/*metabolism ; Dimerization ; Membrane Proteins/metabolism ; Models, Biological ; Molecular Sequence Data ; Mutation ; Mycobacterium tuberculosis/genetics/*metabolism/pathogenicity ; Protein Binding ; *Protein Sorting Signals ; Protein Structure, Tertiary ; Protein Transport ; Recombinant Fusion Proteins/metabolism ; Two-Hybrid System Techniques ; Ubiquitin/metabolism ; Virulence Factors/chemistry/*metabolism
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    The muscle protein Dok-7 is essential for neuromuscular synaptogenesis (2006)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 2006-06-24
    Description: The formation of the neuromuscular synapse requires muscle-specific receptor kinase (MuSK) to orchestrate postsynaptic differentiation, including the clustering of receptors for the neurotransmitter acetylcholine. Upon innervation, neural agrin activates MuSK to establish the postsynaptic apparatus, although agrin-independent formation of neuromuscular synapses can also occur experimentally in the absence of neurotransmission. Dok-7, a MuSK-interacting cytoplasmic protein, is essential for MuSK activation in cultured myotubes; in particular, the Dok-7 phosphotyrosine-binding domain and its target in MuSK are indispensable. Mice lacking Dok-7 formed neither acetylcholine receptor clusters nor neuromuscular synapses. Thus, Dok-7 is essential for neuromuscular synaptogenesis through its interaction with MuSK.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Okada, Kumiko -- Inoue, Akane -- Okada, Momoko -- Murata, Yoji -- Kakuta, Shigeru -- Jigami, Takafumi -- Kubo, Sachiko -- Shiraishi, Hirokazu -- Eguchi, Katsumi -- Motomura, Masakatsu -- Akiyama, Tetsu -- Iwakura, Yoichiro -- Higuchi, Osamu -- Yamanashi, Yuji -- New York, N.Y. -- Science. 2006 Jun 23;312(5781):1802-5.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Cell Regulation, Medical Research Institute, Tokyo Medical and Dental University, Tokyo 113-8510, Japan.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/16794080" target="_blank"〉PubMed〈/a〉
    Keywords: Agrin/metabolism ; Amino Acid Motifs ; Amino Acid Sequence ; Animals ; Cell Differentiation ; Cell Line ; Down-Regulation ; Enzyme Activation ; Humans ; In Situ Hybridization ; Mice ; Molecular Sequence Data ; Motor Endplate/embryology/metabolism ; Muscle Denervation ; Muscle Fibers, Skeletal/cytology/metabolism ; Muscle Proteins/chemistry/genetics/*metabolism ; Muscle, Skeletal/embryology/*innervation/metabolism ; Mutation ; Neuromuscular Junction/*physiology ; Phosphorylation ; Protein Binding ; Protein Structure, Tertiary ; Receptor Aggregation ; Receptor Protein-Tyrosine Kinases/genetics/*metabolism ; Receptors, Cholinergic/genetics/*metabolism ; Synapses/*physiology ; Synaptic Transmission
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    The impact of structural genomics: expectations and outcomes (2006)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2006-01-21
    Description: Structural genomics (SG) projects aim to expand our structural knowledge of biological macromolecules while lowering the average costs of structure determination. We quantitatively analyzed the novelty, cost, and impact of structures solved by SG centers, and we contrast these results with traditional structural biology. The first structure identified in a protein family enables inference of the fold and of ancient relationships to other proteins; in the year ending 31 January 2005, about half of such structures were solved at a SG center rather than in a traditional laboratory. Furthermore, the cost of solving a structure at the most efficient SG center in the United States has dropped to one-quarter of the estimated cost of solving a structure by traditional methods. However, the efficiency of the top structural biology laboratories-even though they work on very challenging structures-is comparable to that of SG centers; moreover, traditional structural biology papers are cited significantly more often, suggesting greater current impact.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Chandonia, John-Marc -- Brenner, Steven E -- 1-K22-HG00056/HG/NHGRI NIH HHS/ -- 1-P50-GM62412/GM/NIGMS NIH HHS/ -- 1-R01-GM073109/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 2006 Jan 20;311(5759):347-51.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Berkeley Structural Genomics Center, Physical Biosciences Division, Lawrence Berkeley National Laboratory, and Department of Plant and Microbial Biology, University of California, Berkeley, CA 94720, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/16424331" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; *Computational Biology ; Costs and Cost Analysis ; Databases, Protein ; Financial Support ; *Genomics/economics ; *Protein Conformation ; Protein Folding ; Proteins/*chemistry/classification ; Publishing
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    A mutant chaperone converts a wild-type protein into a tumor-specific antigen (2006)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 2006-10-14
    Description: Monoclonal antibodies have become important therapeutic agents against certain cancers. Many tumor-specific antigens are mutant proteins that are predominantly intracellular and thus not readily accessible to monoclonal antibodies. We found that a wild-type transmembrane protein could be transformed into a tumor-specific antigen. A somatic mutation in the chaperone gene Cosmc abolished function of a glycosyltransferase, disrupting O-glycan Core 1 synthesis and creating a tumor-specific glycopeptidic neo-epitope consisting of a monosaccharide and a specific wild-type protein sequence. This epitope induced a high-affinity, highly specific, syngeneic monoclonal antibody with antitumor activity. Such tumor-specific glycopeptidic neo-epitopes represent potential targets for monoclonal antibody therapy.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Schietinger, Andrea -- Philip, Mary -- Yoshida, Barbara A -- Azadi, Parastoo -- Liu, Hui -- Meredith, Stephen C -- Schreiber, Hans -- HD 07009/HD/NICHD NIH HHS/ -- P01-CA97296/CA/NCI NIH HHS/ -- P41RR018502-01/RR/NCRR NIH HHS/ -- R01-CA22677/CA/NCI NIH HHS/ -- R01-CA37516/CA/NCI NIH HHS/ -- New York, N.Y. -- Science. 2006 Oct 13;314(5797):304-8.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Pathology, Committee on Immunology, Committee on Cancer Biology, University of Chicago, Chicago, IL 60637, USA. aschieti@uchicago.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17038624" target="_blank"〉PubMed〈/a〉
    Keywords: Acetylgalactosamine/analysis ; Amino Acid Sequence ; Animals ; Antibodies, Monoclonal/*immunology ; Antibody Affinity ; Antigens, Neoplasm/chemistry/*immunology ; Antigens, Tumor-Associated, Carbohydrate/analysis ; Base Sequence ; Cell Line, Tumor ; Epitopes/immunology ; Galactosyltransferases/metabolism ; Glycosylation ; Membrane Glycoproteins/chemistry/*immunology ; Mice ; Molecular Chaperones/chemistry/*genetics/*metabolism ; Molecular Sequence Data ; *Mutation
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    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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    PI(3,4,5)P3 and PI(4,5)P2 lipids target proteins with polybasic clusters to the plasma membrane (2006)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2006-11-11
    Description: Many signaling, cytoskeletal, and transport proteins have to be localized to the plasma membrane (PM) in order to carry out their function. We surveyed PM-targeting mechanisms by imaging the subcellular localization of 125 fluorescent protein-conjugated Ras, Rab, Arf, and Rho proteins. Out of 48 proteins that were PM-localized, 37 contained clusters of positively charged amino acids. To test whether these polybasic clusters bind negatively charged phosphatidylinositol 4,5-bisphosphate [PI(4,5)P2] lipids, we developed a chemical phosphatase activation method to deplete PM PI(4,5)P2. Unexpectedly, proteins with polybasic clusters dissociated from the PM only when both PI(4,5)P2 and phosphatidylinositol 3,4,5-trisphosphate [PI(3,4,5)P3] were depleted, arguing that both lipid second messengers jointly regulate PM targeting.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3579512/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3579512/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Heo, Won Do -- Inoue, Takanari -- Park, Wei Sun -- Kim, Man Lyang -- Park, Byung Ouk -- Wandless, Thomas J -- Meyer, Tobias -- R01 GM030179/GM/NIGMS NIH HHS/ -- R01 GM030179-24A1/GM/NIGMS NIH HHS/ -- R01 GM030179-25/GM/NIGMS NIH HHS/ -- R01 GM063702/GM/NIGMS NIH HHS/ -- R01 MH064801/MH/NIMH NIH HHS/ -- New York, N.Y. -- Science. 2006 Dec 1;314(5804):1458-61. Epub 2006 Nov 9.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Molecular Pharmacology, 318 Campus Drive, Clark Building, Stanford University Medical School, Stanford, CA 94305, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17095657" target="_blank"〉PubMed〈/a〉
    Keywords: ADP-Ribosylation Factors/chemistry/metabolism ; Amino Acid Motifs ; Amino Acid Sequence ; Animals ; Cell Membrane/*metabolism ; GTP Phosphohydrolases/chemistry/*metabolism ; HeLa Cells ; Humans ; Hydrophobic and Hydrophilic Interactions ; Kinetics ; Mice ; Molecular Sequence Data ; NIH 3T3 Cells ; Phosphatidylinositol 4,5-Diphosphate/*metabolism ; Phosphatidylinositol Phosphates/*metabolism ; Second Messenger Systems ; Signal Transduction ; Static Electricity ; rab GTP-Binding Proteins/chemistry/metabolism ; ras Proteins/chemistry/metabolism ; rho GTP-Binding Proteins/metabolism
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    Structure of the exon junction core complex with a trapped DEAD-box ATPase bound to RNA (2006)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2006-08-26
    Description: In higher eukaryotes, a multiprotein exon junction complex is deposited on spliced messenger RNAs. The complex is organized around a stable core, which serves as a binding platform for numerous factors that influence messenger RNA function. Here, we present the crystal structure of a tetrameric exon junction core complex containing the DEAD-box adenosine triphosphatase (ATPase) eukaryotic initiation factor 4AIII (eIF4AIII) bound to an ATP analog, MAGOH, Y14, a fragment of MLN51, and a polyuracil mRNA mimic. eIF4AIII interacts with the phosphate-ribose backbone of six consecutive nucleotides and prevents part of the bound RNA from being double stranded. The MAGOH and Y14 subunits lock eIF4AIII in a prehydrolysis state, and activation of the ATPase probably requires only modest conformational changes in eIF4AIII motif I.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Andersen, Christian B F -- Ballut, Lionel -- Johansen, Jesper S -- Chamieh, Hala -- Nielsen, Klaus H -- Oliveira, Cristiano L P -- Pedersen, Jan Skov -- Seraphin, Bertrand -- Le Hir, Herve -- Andersen, Gregers Rom -- New York, N.Y. -- Science. 2006 Sep 29;313(5795):1968-72. Epub 2006 Aug 24.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Molecular Biology, University of Aarhus, DK-8000 Aarhus, Denmark.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/16931718" target="_blank"〉PubMed〈/a〉
    Keywords: Adenosine Triphosphate/analogs & derivatives/metabolism ; Adenylyl Imidodiphosphate/metabolism ; Amino Acid Motifs ; Amino Acid Sequence ; Animals ; Crystallography, X-Ray ; DEAD-box RNA Helicases ; Dimerization ; Drosophila Proteins/chemistry/metabolism ; Eukaryotic Initiation Factor-4A/*chemistry/metabolism ; *Exons ; Humans ; Hydrogen Bonding ; Hydrolysis ; Models, Molecular ; Molecular Sequence Data ; Mutation ; Neoplasm Proteins/*chemistry/metabolism ; Nuclear Proteins/*chemistry/metabolism ; Nucleic Acid Conformation ; Poly U/*chemistry/metabolism ; Protein Conformation ; Protein Structure, Secondary ; Protein Structure, Tertiary ; RNA Helicases/chemistry/metabolism ; RNA, Messenger/*chemistry/metabolism ; RNA-Binding Proteins/*chemistry/metabolism
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    Lineages of acidophilic archaea revealed by community genomic analysis (2006)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 2006-12-23
    Description: Novel, low-abundance microbial species can be easily overlooked in standard polymerase chain reaction (PCR)-based surveys. We used community genomic data obtained without PCR or cultivation to reconstruct DNA fragments bearing unusual 16S ribosomal RNA (rRNA) and protein-coding genes from organisms belonging to novel archaeal lineages. The organisms are minor components of all biofilms growing in pH 0.5 to 1.5 solutions within the Richmond Mine, California. Probes specific for 16S rRNA showed that the fraction less than 0.45 micrometers in diameter is dominated by these organisms. Transmission electron microscope images revealed that the cells are pleomorphic with unusual folded membrane protrusions and have apparent volumes of 〈0.006 cubic micrometer.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Baker, Brett J -- Tyson, Gene W -- Webb, Richard I -- Flanagan, Judith -- Hugenholtz, Philip -- Allen, Eric E -- Banfield, Jillian F -- New York, N.Y. -- Science. 2006 Dec 22;314(5807):1933-5.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Earth and Planetary Sciences, University of California, Berkeley, CA 94720, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17185602" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Base Sequence ; *Biofilms ; California ; Cell Membrane/ultrastructure ; DNA Transposable Elements ; DNA, Archaeal ; Databases, Genetic ; *Ecosystem ; *Euryarchaeota/genetics/physiology/ultrastructure ; Genes, Archaeal ; Genes, rRNA ; *Genome, Archaeal ; Hydrogen-Ion Concentration ; Microscopy, Electron, Transmission ; Mining ; Molecular Sequence Data ; Oligonucleotide Probes ; Phylogeny ; Pyrophosphatases/genetics/metabolism ; RNA, Ribosomal, 16S/genetics ; Temperature
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    France. Chemist claims innocence to spying charge (2006)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 2006-04-29
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Enserink, Martin -- New York, N.Y. -- Science. 2006 Apr 28;312(5773):512.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/16645058" target="_blank"〉PubMed〈/a〉
    Keywords: Chemistry ; China ; *Fatty Acids ; France ; History, 21st Century ; *Theft
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    Design and evolution of new catalytic activity with an existing protein scaffold (2006)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 2006-01-28
    Description: The design of enzymes with new functions and properties has long been a goal in protein engineering. Here, we report a strategy to change the catalytic activity of an existing protein scaffold. This was achieved by simultaneous incorporation and adjustment of functional elements through insertion, deletion, and substitution of several active site loops, followed by point mutations to fine-tune the activity. Using this approach, we were able to introduce beta-lactamase activity into the alphabeta/betaalpha metallohydrolase scaffold of glyoxalase II. The resulting enzyme, evMBL8 (evolved metallo beta-lactamase 8), completely lost its original activity and, instead, catalyzed the hydrolysis of cefotaxime with a (kcat/Km)app of 1.8 x 10(2) (mole/liter)(-1) second(-1), thus increasing resistance to Escherichia coli growth on cefotaxime by a factor of about 100.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Park, Hee-Sung -- Nam, Sung-Hun -- Lee, Jin Kak -- Yoon, Chang No -- Mannervik, Bengt -- Benkovic, Stephen J -- Kim, Hak-Sung -- New York, N.Y. -- Science. 2006 Jan 27;311(5760):535-8.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Biological Sciences, Korea Advanced Institute of Science and Technology, 373-1, Kusung-Dong, Yusung-Gu, Daejon 305-701, Korea.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/16439663" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Binding Sites ; Catalysis ; Catalytic Domain ; Cefotaxime/metabolism/pharmacology ; *Directed Molecular Evolution ; Drug Resistance, Bacterial ; Escherichia coli/drug effects ; Evolution, Molecular ; Humans ; Hydrophobic and Hydrophilic Interactions ; Iron/metabolism ; Kinetics ; Metals/metabolism ; Models, Molecular ; Molecular Sequence Data ; Point Mutation ; Protein Conformation ; *Protein Engineering ; Protein Folding ; Protein Structure, Secondary ; Protein Structure, Tertiary ; Recombinant Fusion Proteins/metabolism ; Substrate Specificity ; Thiolester Hydrolases/*chemistry/genetics/*metabolism ; Zinc/metabolism ; beta-Lactamases/chemistry/*metabolism
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    A NAC Gene regulating senescence improves grain protein, zinc, and iron content in wheat (2006)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2006-11-25
    Description: Enhancing the nutritional value of food crops is a means of improving human nutrition and health. We report here the positional cloning of Gpc-B1, a wheat quantitative trait locus associated with increased grain protein, zinc, and iron content. The ancestral wild wheat allele encodes a NAC transcription factor (NAM-B1) that accelerates senescence and increases nutrient remobilization from leaves to developing grains, whereas modern wheat varieties carry a nonfunctional NAM-B1 allele. Reduction in RNA levels of the multiple NAM homologs by RNA interference delayed senescence by more than 3 weeks and reduced wheat grain protein, zinc, and iron content by more than 30%.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4737439/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4737439/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Uauy, Cristobal -- Distelfeld, Assaf -- Fahima, Tzion -- Blechl, Ann -- Dubcovsky, Jorge -- Howard Hughes Medical Institute/ -- New York, N.Y. -- Science. 2006 Nov 24;314(5803):1298-301.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Plant Sciences, University of California, One Shields Avenue, Davis, CA 95616, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17124321" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Base Sequence ; Cloning, Molecular ; Frameshift Mutation ; *Genes, Plant ; Iron/*metabolism ; Molecular Sequence Data ; Plant Leaves/chemistry ; Plant Proteins/*metabolism ; Plants, Genetically Modified ; Protein Structure, Tertiary ; Quantitative Trait Loci ; RNA Interference ; RNA, Plant/genetics/metabolism ; Transcription Factors/chemistry/*genetics/physiology ; Triticum/chemistry/*genetics/*metabolism/physiology ; Zinc/*metabolism
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    Decay of endoplasmic reticulum-localized mRNAs during the unfolded protein response (2006)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 2006-07-11
    Description: The unfolded protein response (UPR) allows the endoplasmic reticulum (ER) to recover from the accumulation of misfolded proteins, in part by increasing its folding capacity. Inositol-requiring enzyme-1 (IRE1) promotes this remodeling by detecting misfolded ER proteins and activating a transcription factor, X-box-binding protein 1, through endonucleolytic cleavage of its messenger RNA (mRNA). Here, we report that IRE1 independently mediates the rapid degradation of a specific subset of mRNAs, based both on their localization to the ER membrane and on the amino acid sequence they encode. This response is well suited to complement other UPR mechanisms because it could selectively halt production of proteins that challenge the ER and clear the translocation and folding machinery for the subsequent remodeling process.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Hollien, Julie -- Weissman, Jonathan S -- New York, N.Y. -- Science. 2006 Jul 7;313(5783):104-7.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Cellular and Molecular Pharmacology, University of California San Francisco, Howard Hughes Medical Institute, San Francisco, CA 94143, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/16825573" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Animals ; Base Sequence ; Cell Line ; DNA-Binding Proteins/metabolism ; Dithiothreitol/pharmacology ; Down-Regulation ; Drosophila Proteins/chemistry/genetics/*metabolism ; Drosophila melanogaster/genetics/metabolism ; Endoplasmic Reticulum/*metabolism ; Endoribonucleases/genetics/*metabolism ; Exoribonucleases/genetics/metabolism ; Gene Expression Regulation ; Genes, Insect ; Membrane Proteins/genetics/*metabolism ; Molecular Sequence Data ; Mutation ; Oligonucleotide Array Sequence Analysis ; Protein Biosynthesis ; *Protein Folding ; Protein Sorting Signals ; *RNA Stability ; RNA, Messenger/genetics/*metabolism ; Transcription Factors/metabolism ; Transcription, Genetic
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    X-ray Structure of a self-compartmentalizing sulfur cycle metalloenzyme (2006)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2006-02-18
    Description: Numerous microorganisms oxidize sulfur for energy conservation and contribute to the global biogeochemical sulfur cycle. We have determined the 1.7 angstrom-resolution structure of the sulfur oxygenase reductase from the thermoacidophilic archaeon Acidianus ambivalens, which catalyzes an oxygen-dependent disproportionation of elemental sulfur. Twenty-four monomers form a large hollow sphere enclosing a positively charged nanocompartment. Apolar channels provide access for linear sulfur species. A cysteine persulfide and a low-potential mononuclear non-heme iron site ligated by a 2-His-1-carboxylate facial triad in a pocket of each subunit constitute the active sites, accessible from the inside of the sphere. The iron is likely the site of both sulfur oxidation and sulfur reduction.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Urich, Tim -- Gomes, Claudio M -- Kletzin, Arnulf -- Frazao, Carlos -- New York, N.Y. -- Science. 2006 Feb 17;311(5763):996-1000.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Darmstadt University of Technology, Institute of Microbiology and Genetics, Schnittspahnstrasse 10, 64287 Darmstadt, Germany.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/16484493" target="_blank"〉PubMed〈/a〉
    Keywords: Acidianus/*enzymology/physiology ; Amino Acid Sequence ; Archaeal Proteins/*chemistry/metabolism ; Binding Sites ; Catalysis ; Catalytic Domain ; Crystallization ; Crystallography, X-Ray ; Hot Temperature ; Hydrophobic and Hydrophilic Interactions ; Iron/chemistry/metabolism ; Ligands ; Models, Molecular ; Molecular Sequence Data ; Oxidation-Reduction ; Oxidoreductases Acting on Sulfur Group Donors/*chemistry/metabolism ; Protein Conformation ; Protein Folding ; Protein Structure, Quaternary ; Protein Structure, Tertiary ; Recombinant Proteins/chemistry ; Static Electricity ; Sulfur/*metabolism
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    Nuclear activity of MLA immune receptors links isolate-specific and basal disease-resistance responses (2006)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2006-12-23
    Description: Plant immune responses are triggered by pattern recognition receptors that detect conserved pathogen-associated molecular patterns (PAMPs) or by resistance (R) proteins recognizing isolate-specific pathogen effectors. We show that in barley, intracellular mildew A (MLA) R proteins function in the nucleus to confer resistance against the powdery mildew fungus. Recognition of the fungal avirulence A10 effector by MLA10 induces nuclear associations between receptor and WRKY transcription factors. The identified WRKY proteins act as repressors of PAMP-triggered basal defense. MLA appears to interfere with the WRKY repressor function, thereby de-repressing PAMP-triggered basal defense. Our findings reveal a mechanism by which these polymorphic immune receptors integrate distinct pathogen signals.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Shen, Qian-Hua -- Saijo, Yusuke -- Mauch, Stefan -- Biskup, Christoph -- Bieri, Stephane -- Keller, Beat -- Seki, Hikaru -- Ulker, Bekir -- Somssich, Imre E -- Schulze-Lefert, Paul -- New York, N.Y. -- Science. 2007 Feb 23;315(5815):1098-103. Epub 2006 Dec 21.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Plant Microbe Interactions, Max-Planck-Institut fur Zuchtungsforschung, Carl-von-Linne-Weg 10, D-50829 Koln, Germany.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17185563" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Arabidopsis/genetics/*immunology/metabolism/microbiology ; Arabidopsis Proteins/genetics/metabolism ; Ascomycota/growth & development/*immunology ; Cell Nucleus/metabolism ; Cytoplasm/metabolism ; Fungal Proteins/metabolism ; Hordeum/genetics/*immunology/metabolism/microbiology ; Immunity, Innate ; Molecular Sequence Data ; Mutation ; Plant Diseases/*immunology/microbiology ; Plant Proteins/chemistry/genetics/*metabolism ; Plants, Genetically Modified ; Protein Structure, Tertiary ; Receptors, Immunologic/chemistry/genetics/*metabolism ; Receptors, Pattern Recognition/metabolism ; Recombinant Fusion Proteins/metabolism ; Transcription Factors/genetics/*metabolism ; Two-Hybrid System Techniques
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    Genetics. SNPs, silent but not invisible (2006)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 2006-12-23
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Komar, Anton A -- New York, N.Y. -- Science. 2007 Jan 26;315(5811):466-7. Epub 2006 Dec 21.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Biological, Geological and Environmental Sciences, Cleveland State University, Cleveland, OH 44115, USA. a.komar@csuohio.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17185559" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Codon ; Cyclosporine/pharmacology ; *Genes, MDR ; Haplotypes ; Mutagenesis, Site-Directed ; P-Glycoprotein/antagonists & inhibitors/*chemistry/genetics/*metabolism ; *Polymorphism, Single Nucleotide ; Protein Biosynthesis ; *Protein Conformation ; *Protein Folding ; RNA, Messenger/genetics/metabolism ; Verapamil/pharmacology
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    A gain-of-function mutation in a cytokinin receptor triggers spontaneous root nodule organogenesis (2006)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 2006-11-18
    Description: Legume root nodules originate from differentiated cortical cells that reenter the cell cycle and form organ primordia. We show that perception of the phytohormone cytokinin is a key element in this switch. Mutation of a Lotus japonicus cytokinin receptor gene leads to spontaneous development of root nodules in the absence of rhizobia or rhizobial signal molecules. The mutant histidine kinase receptor has cytokinin-independent activity and activates an Escherichia coli two-component phosphorelay system in vivo. Mutant analysis shows that cytokinin signaling is required for cell divisions that initiate nodule development and defines an autoregulated process where cytokinin induction of nodule stem cells is controlled by shoots.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Tirichine, Leila -- Sandal, Niels -- Madsen, Lene H -- Radutoiu, Simona -- Albrektsen, Anita S -- Sato, Shusei -- Asamizu, Erika -- Tabata, Satoshi -- Stougaard, Jens -- New York, N.Y. -- Science. 2007 Jan 5;315(5808):104-7. Epub 2006 Nov 16.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Laboratory of Gene Expression, Department of Molecular Biology, University of Aarhus, Gustav Wieds Vej 10, DK-8000 Aarhus C, Denmark.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17110537" target="_blank"〉PubMed〈/a〉
    Keywords: Alleles ; Amino Acid Motifs ; Amino Acid Sequence ; Calcium/metabolism ; Cell Division ; Cytokinins/*metabolism/pharmacology ; Escherichia coli/genetics ; Gene Expression Regulation, Plant ; Genes, Plant ; Kinetin/pharmacology ; Lipopolysaccharides/metabolism ; Lotus/genetics/metabolism/*physiology ; Meristem/cytology ; Molecular Sequence Data ; Mutation ; Nitrogen Fixation ; Plant Roots/cytology/metabolism ; Plants, Genetically Modified ; Protein Kinases/chemistry/*genetics/*metabolism ; Receptors, Cell Surface/chemistry/genetics/metabolism ; Root Nodules, Plant/cytology/*growth & development/metabolism ; *Signal Transduction ; Transformation, Genetic
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    Electronic Resource
    Ein modell zur quantitativen beschreibung der morphogenesis von PVC-S, IIITeil II, cf.2.. Modellierung der inneren morphologie  -  parameterstudien (1989)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 165 (1989), S. 35-45 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: In this part properties and efficiency of the developed model1,2 are discussed. A variation of the parameters shows that vigorous effects are caused by the effective aggregation. All calculations show that at low conversion there are little temporal steps between the sequential aggregation steps. In the range of 5% to 20% conversion the velocity of aggregation decreases and the aggregative stability agrees with experiences given in the literature. It is shown that the calculated results are in agreement with the experimental results and therefore the presented model is a suitable possibility to describe the formation of some PVC-morphology properties.
    Notes: In der vorliegenden Arbeit werden die Eigenschaften des früher1,2 entwickelten Modells untersucht und diskutiert. Die Variation der Modellparameter zeigt einen großen Einfluß der Aggregationsprozesse auf die Subkornmorphologie. Bei niedrigen Monomerumsätzen ist das Zeitintervall zwischen zwei aufeinanderfolgenden Aggregationsschritten sehr klein, so daß für das Teilchenwachstum die Geschwindigkeit der Aggregation der Unterstrukturen entscheidend ist. Im Bereich zwischen 5% und 20% Monomerumsatz sinkt die Aggregationsgeschwindigkeit sehr stark, so daß für das Teilchenwachstum zunehmend die Polymerisationsreaktion an Bedeutung gewinnt. Aggregative Stabilität wird nach dem Modell für einen Teilchengrößenbereich erhalten, der sich in Übereinstimmung mit experimentellen Daten aus der Fachliteratur befindet. Die berechneten Teilchengrößen entsprechen ebenfalls den in der Literatur publizierten experimentellen Werten, so daß das Modell eine gute Grundlage für die Beschreibung einiger morphologisch bestimmter Polymereigenschaften bildet.
    Additional Material: 5 Ill.
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    URL: http://dx.doi.org/10.1002/apmc.1989.051650104
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    Correlation between the production parameters and the mechanical properties of novolac resins reinforced with carbon fibers (1989)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 165 (1989), S. 21-34 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Es wurden unidirektionale Verbundwerkstoffe aus Novolakharz mit Kohlenstoff-Fasern gemäß der Prepreg-Methode verarbeitet. Das Novolakharz wurde durch Polymerisation von Phenol mit Formaldehyd (Mol-Verhältnis 1 : 0,82) und Oxalsäure als Katalysator (1,5 Gew.-% von Phenol) hergestellt. Die Härtung des Novolakharzes wurde mit Hexamethylentetramin (Hexa) durchgeführt, während das geeignete Verhältnis durch die IR-Spektroskopie bestimmt wurde.Es wurden Proben aus Novolak/Hexa (Gew.-Verhältnis 14: 1), verstärkt mit kommerziellen Kohlenstoff-Fasern, unter verschiedenen Bedingungen (z. B. verschiedene thermische Programme und verschiedene Verhältnisse von Novolakharz : Kohlenstoff-Fasern) hergestellt. Die mechanischen Eigenschaften der hergestellten Proben (wie Biegefestigkeit, Zugfestigkeit, usw.) wurden bestimmt, und ihre Struktur wurde mit Hilfe der Elektronenmikroskopie untersucht.Mit zunehmendem Volumenverhältnis der Kohlenstoff-Fasern werden nicht nur alle mechanischen Eigenschaften des verstärkten Materials verbessert, sondern auch sein Nutzungsgrad nimmt zu, und die Herstellungsbedingungen üben einen größeren Einfluß aus. Die mit dem gleichen Verhältnis von Kohlenstoff-Fasern (z. B. 15 Vol.-%) hergestellten Proben weisen mit zunehmendem Härtungsgrad des Novolaks verbesserte mechanische Eigenschaften auf. Der Häirtungsgrad des Novolaks während der Anfangsphase (Gel-Zeit) als auch während der Endphase (Nachhärtung) kann mit Hilfe der IR-Spektren des härtenden Novolaks verfolgt werden, während der Härtungsgrad der Zwischenphase nur indirekt aus den Werten der mechanischen Eigenschaften der entsprechenden Proben bestimmt werden kann.Aus der Korrelation zwischen den Herstellungsparametern und den mechanischen Eigenschaften der Proben ergeben sich optimale Bedingungen für die Verarbeitung in der Wärmepresse zur Herstellung von mit Kohlenstoff-Fasern verstärkten Novolakharzen (1. Phase: T1 = 125-145°C, t1 = 20 min - 1 h, ohne Druck; 2. Phase: T2 = 180-195°C, t2 = 40 min, P2 ≃ 1,5 kN /cm2).
    Notes: Unidirectional composite materials of novolac resin with carbon fibers were fabricated according to the prepreg method. Novolac resin was prepared by polymerization of phenol with formaldehyde (mole ratio 1 : 0.82) in the presence of oxalic acid as catalyst (1.5 wt.-% to phenol). The curing of novolac resin was performed with hexamethylenetetramine (hexa), while the appropriate proportion was determined by using the IR-spectroscopy.Specimens of novolac/hexa (weight ratio 14:1) reinforced with carbon fibers commercially available were fabricated under different conditions (e.g. different thermal programs and different proportions of novolac/carbon fibers). The mechanical properties of the fabricated specimens (like flexural strength, tensile strength, etc.) were determined and their structure was examined by scanning electron microscopy.By increasing the volume proportion of carbon fibers, not only all mechanical properties of the composite material were increased, but also their degree of utilization was increased and also the production conditions had greater influence. Concerning the specimens produced by the same proportion of carbon fibers (e.g. 15 vol.-%) their mechanical properties were improved by increasing the curing of novolac. The degree of curing of novolac during the initial phase (gel time) and during the ultimate phase (post-curing) can be followed with the aid of IR-spectra of the cured resin, while the degree of curing for the intermediate phase can be obtained only indirectly from the values of the mechanical properties of the corresponding specimens.From the correlation between the production parameters and the mechanical properties of the samples the optimal conditions for processing of the thermopress for the manufacture of carbon fiber reinforced novolac were concluded (1. phase: T1 = 125-145°C, t1 = 20 min - 1 h, without pressure; 2. phase: T2 = 180-195°C, t2 = 40 min, P2 ≃ 1,5 kN/cm2).
    Additional Material: 4 Ill.
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    Effect of concentration and temperature on the electrical conductivity of butyl rubber loaded with different types of carbon black (1989)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 165 (1989), S. 69-78 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: In dieser Arbeit interessieren wir uns für den Einfluß von Konzentration und Temperatur auf den elektrischen Widerstand eines Butyl-Kautschuks (IIR), der mit zwei Typen von Ruß (Hoch-Abrasion-Schmelzofen-Ruß (HAF) und Schnell-Extrusion-Hochofen-Ruß (FEF)) versetzt ist. Ergebnis war, daß die Leitfähigkeit bei niedrigem Rußgehalt hauptsächlich durch thermische Aktivierung der Ladungsträger erreicht wird. Bei mittleren Konzentrationen überwiegt der Tunnel-Mechanismus bei niedriger Temperatur, gefolgt von der thermischen Aktivierung bei relativ hoher Temperatur. Dies gilt für beide Rußarten. Das metallartige Verhalten bei Gemischen mit hoher Rußkonzentration kann sowohl der thermischen Ausdehnung der Tunnelwege zwischen Kohlenstoff-Agglomeraten als auch dem Zusammenbruch der Kohlenstoff-Agglomerate bei steigender Temperatur zugeschrieben werden.
    Notes: In this study we are interested in the effect of concentration and temperature on the electrical resistivity of butyl rubber (IIR) loaded with two types of carbon black, (namely, high abrasion furnace black (HAF), and fast extrusion furnace black (FEF)). It was found that the conductivity at low carbon black concentrations is mainly achieved by thermal activation of carriers. Tunneling mechanism at low termperature followed by thermal activation at relatively high temperature is found to be predominant for moderate concentrations for both carbon blacks. The metal-like behaviour which was observed in highly loaded compounds was attributed to both, the thermal expansion of the tunneling paths between carbon-carbon agglomerates and the breakdown of carbon agglomerates with temperature.
    Additional Material: 4 Ill.
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    URL: http://dx.doi.org/10.1002/apmc.1989.051650106
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    Synthesis of halogenated phenyl glycidyl ethers and their use for flame retardancy of polymeric materials (1989)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 165 (1989), S. 79-87 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Die Arbeit beschreibt die Synthese von Halogenderivaten des Phenylglycidylethers und die Möglichkeiten der Verwendung von diesen Komponenten als Flammverzögerer und reaktive Verdünnungsmittel für Epoxidharze.Mit Hilfe der Nelder-Mead-Simplexmethode wurden die besten Reaktionsbedingungen gefunden. Die so hergestellten Produkte zeichnen sich durch eine hohe Qualität aus und wurden mit einem niedermolekularen Epoxidharz gemischt und mit Diaminodiphenylmethan gehärtet.Die Viskosität von Harzgemischen und die Brennbarkeit der gehärteten Systeme wurden untersucht. Mit dem erhöhten Gehalt an Halogen (Chlor oder Brom) steigt die Viskosität, und die Brennbarkeit der Epoxide wird reduziert.
    Notes: This study deals with the synthesis of halogenated derivatives of phenyl glycidyl ether and with possibilities of their use as flame retardants and reactive diluents of epoxy resin.The best reaction conditions optimized by Nelder-Mead simplex method were found. The products of very high quality were prepared. They were mixed with a lowmolecular epoxy resin and cured by diamino diphenyl methane.The viscosity of the resin mixtures and limiting oxygen index of cured systems were determined. It was found that a higher content of halogen, both chlorine and bromine, causes increasing viscosity and reduced flammability of the epoxides.
    Additional Material: 2 Ill.
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    URL: http://dx.doi.org/10.1002/apmc.1989.051650107
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    Blends of chlorinated isotactic polypropylene with poly(ethylene-co-vinyl acetate) IIPart I, cf.1.. Phase studies of the miscible blends (1989)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 165 (1989), S. 89-95 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Durch Messungen von Tg, Tm und Tc (Trübungspunkt) wurden Phasendiagramme der vier verträglichen Polymermischungen von chlorierten isotaktischen Polypropylenen (Chlorgehalt 39,2 (CPP-40) und 49,8 Gew.-% (CPP-50)) mit Poly(ethylen-co-vinylacetat)en (Vinylacetatgehalt 40 (EVA-40) und 45 Gew.-% (EVA-45)) untersucht. Von den vier Mischungspaaren war die Mischung von CPP-50 mit EVA-40 am besten verträglich.
    Notes: By measuring Tg, Tm and Tc (cloud point) phase diagrams for the four miscible blends of chlorinated isotactic polypropylenes (chlorine content 39.2 (CPP-40) and 49.8 wt.-% (CP-50)) with Poly(ethylene-co-vinyl acetate)s (vinyl acetate contents 40 (EVA-40) and 45 wt.-% (EVA-45)) were investigated. The blend of CPP-50 with EVA-40 was the most compatible of the four blend pairs.
    Additional Material: 4 Ill.
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    URL: http://dx.doi.org/10.1002/apmc.1989.051650108
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    The characterisation of the polyethylene-polystyrene-divinylbenzene interpolymer cation-exchange membranes in the electrolysis of borax solutionsThis paper was presented at the Synthetic Polymeric Membranes Symposium, held during the 29th Microsymposium on Macromolecules in Prague, Czechoslovakia, July 1986. (1989)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 165 (1989), S. 97-108 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Die Synthese und Charakterisierung von Kationenaustauschmembranen aus PE-PS-DVB-Interpolymeren für die Elektrolyse von Borax-Lösung zur Erzeugung von Borsäure und Natronlauge wurden durchgeführt und mit den Eigenschaften von im Handel erhältlichen Membranen („Nafion 324“ und „Permaplex C-20“) verglichen.
    Notes: The synthesis and the characterization of the PE-PS-DVB interpolymer cationexchange membranes in the electrolysis of borax solutions to produce boric acid and sodium hydroxide simultaneously was carried out. The characterization of the teflon based “Nafion 324” and polystyrene-DVB based “Permaplex C-20” membranes was also performed in the same system for comparison.The DVB contents were varied between 3 - 12% (by wt. in total monomers) and the increase of the cross-links resulted in the decrease of the water contents and ionexchange capacities of the membranes. The PE present in the membrane acted as a barrier for electroosmotic water transport. The membranes with high DVB contents showed better electrolysis performance due to their low water contents and low electroosmotic water transport properties. The use of the interpolymer membrane containing 11.6% DVB resulted in high current efficiency and high sodium cation dynamic transport number and worked satisfactorily at the process conditions of borax electrolysis.
    Additional Material: 5 Ill.
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    Interpenetrating polymer networks from castor oil and dibasic acids (1989)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 165 (1989), S. 125-131 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Aus Rizinusöl und difunktionellen Säuren, wie Oxal-, Malon-, Bernstein-, Glutar-, Adipin-, Suberin- und Sebacinsäure, wurden Prepolyester hergestellt. Diese Prepolyester (PPE) wurden anschließend mit Methylmethacrylat und 1% Ethylenglykoldimethacrylat als Vernetzer interpenetriert. Die Polymerisation wurde radikalisch mit Benzoylperoxid gestartet. Die neuen PPE/Polymethylmethacrylat (PMMA)-interpenetrierenden Netzwerke wurden als Pulver erhalten. Sie wurden durch ihr Löseverhalten, IR-Spektroskopie und ihr thermisches Verhalten charakterisiert.
    Notes: Prepolyesters were obtained from castor oil and dibasic acids, viz oxalic, malonic, succinic, glutaric, adipic, suberic and sebacic acid. These prepolyesters (PPE) were subsequently interpenetrated with methyl methacrylate containing 1% ethylene glycol dimethacrylate as crosslinker by radical polymerization initiated with benzoyl peroxide. The novel PPE poly(methyl methacrylate) PPE/PMMA interpenetrating polymer networks (IPNs) were obtained as powder. They were characterized by solubility behaviour, IR spectral study and thermal behaviour.
    Additional Material: 4 Tab.
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    Immobilization of 2,4-ionene on a macroporous poly(styrene-divinylbenzene) resin and its effect on the rate of the cobaltphthalocyanine-catalyzed oxidative coupling of mercaptoethanol (1989)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 173 (1989), S. 119-135 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: 2,4-Ionen, ein polymeres quartäres Ammoniumsalz, wurde auf einem makroporösen chlormethylierten Poly(Styrol-co-Divinylbenzol)-Harz (XAD-2) immobilisiert. Der Ionen-Gehalt des Harzes, der durch CHN-Elementaranalyse bestimmt wurde, betrug 50,2 g/kg Harz. Der wichtigste Nebeneffekt des modifizierten Harzes, das Ausbluten des Katalysators 2,4-Ionen, kann durch eine spektrophotometrische Methode, die extrem geringe Konzentraionen an freiem Ionen an der Oberfläche des Harzes messen kann, ermittelt werden.Die Aktivität der immobilisierten 2,4-Ionen/Kobalt(II)-phthalocyanin-tetranatriumsulfonat-Komplexe in bezug auf die oxidative Kupplung von Thiolen ist viel niedriger als im homogenen Fall, aber noch beträchtlich höher als im polymerfreien System. Die beobachtete Abnahme der Reaktionsgeschwindigkeit resultiert nicht aus Behinderungen des Massentransports, sondern vorzugsweise aus den Katalysatoreigenschaften wie z. B. einem sehr niedrigen N+/Co-VerhtUtnis. Die aktiven Zentren scheinen nur in der äußeren Hiille der Harzpartikel vorhanden zu sein.
    Notes: A poly(quaternary ammonium) salt, 2,4-ionene, has been immobilized on a macroporous chloromethylated poly(styrene-divinylbenzene) resin (XAD-2). The ionene content of the resin, determined by CHN elemental analysis, was 50.2 g/kg resin. The most important side effect of the modified resin, catalyst (2,4-ionene) bleeding, can be detected by a spectrophotometric method capable of determining extremely low concentrations of free ionene in the supernatant of the resin.The activity of these immobilized 2,4-ionene/cobalt(II)phthalocyanine-tetrasodiumsulfonate (CoTSPc) complexes towards the oxidative coupling of thiols is much lower than in the homogeneous case, but still considerably higher than for the polymer free system. The observed decrease in reaction rate does not originate from the considerable mass transfer resistances but predominantly from catalyst properties like a very low local N+/Co ratio. The active sites appear to be present in the outer shell of the resin particles only.
    Additional Material: 5 Ill.
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    Molecular aggregation of PEEK with PES blends and the block copolymers composed of PEEK and PES components (1989)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 173 (1989), S. 163-181 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Röntgendiffraktometrische Untersuchungen und DSC-Messungen an Blend-Filmen, die aus Lösungen von PEEK und PES hergestellt wurden, zeigen eine Phasenseparation bei den Filmen, die bei 340°C hergestellt wurden. Das Kristallisationsverhalten von Filmen, die bei 340°C hergestellt, anschließend abgeschreckt und bei 180°C getempert wurden, ist identisch mit dem von PEEK. Filme, die bei 300°C hergestellt wurden, kristallisierten erst durch Tempern bei 250°C. Blockcopolymere, die aus Oligomeren von PEEK und PES erhalten wurden, unterscheiden sich in dieser Hinsicht von Blends der gleichen Zusammensetzung. Die Glastemperatur von Copolymeren mit einem PEEK-Gehalt von mehr als 50% liegt höher als die von PEEK selbst, während der Schmelzpunkt dieser Copolymeren niedriger als der von PEEK ist.
    Notes: Polymer blends of PEEK with PES were prepared by the solution blending method. Copolymers composed of PEEK and PES components were synthesized from these oligomers. The formation conditions exerted an influence over the molecular aggregation and the crystallization behaviors of the blend films and block copolymers which were examined by X-ray diffractometry and DSC analysis. As a result, phase-separation in the blend films was found when the formation temperature was high. The blend films formed at 340°C, quenched and annealed at 180°C, exhibited the same crystallization behavior as those of PEEK. In the case of the blend films formed at 300°C, the annealing of the films at 250°C was required to crystallize the blend films. The Tg of a copolymer with a PEEK component content of more than 50% tends to shift toward a higher temperature than the Tg of PEEK itself, and the Tm of the copolymer toward a lower temperature than that of PEEK ist.
    Additional Material: 16 Ill.
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    Copolymer of cyclohexanone-formaldehyde resin and polystyrene (1989)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 168 (1989), S. 129-134 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Das Reaktionsprodukt eines Cyclohexanon-Formaldehyd-Harzes mit dem Säurechlorid des Radikalinitiators 4,4′-Azo-bis(4-cyanopentansäure) wurde als Initiator für die Styrolpolymerisation eingesetzt, um ein Cyclohexanon-Formaldehyd-Harz/Polystyrol-Copolymeres zu bilden. Das Copolymere zeigte ähnliche Löslichkeit wie Polystyrol.
    Notes: The reaction product of cyclohexanone-formaldehyde resin with an acid chloride of a radical initiator, 4,4′-azo-bis(4-cyano pentanoic acid) was used as initiator for styrene polymerization to form a cyclohexanone-formaldehyde resin/polystyrene copolymer. The copolymer showed similar solubility as polystyrene.
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    Effect of charge groups in polyurethane and polystyrene interpenetrating polymer networks (1989)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 168 (1989), S. 145-155 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Entgegengesetzte Ladungen wurden durch tertiäre Amin- und Carboxylgruppen in Polyurethan (PU) und Polystyrol (PS) eingeführt, um durch gemeinsame Massepolymerisation ein interpenetrierendes PU/PS Polymernetzwerk (IPN) zu erhalten. Vier IPNs wurden hergestellt: ein Voll-IPN, zwei Semi-IPNs und ein lineares Blend. Die Wirkung der geladenen Gruppen auf die mechanischen Eigenschaften und die Morphologie der vier Polymermischungen wurde untersucht.Es wurde gefunden, daß PU/PS IPNs mit geladenen Gruppen keine Phasenseparation und somit homogene Verteilung aufweisen, was durch elektronenmikroskopische (SEM) Aufnahmen nachgewiesen wurde. Dynamisch-mechanische Messungen zeigen, daß die Übergangspeaks des Verlust-Moduls E″ in die Mitte zwischen den beiden Übergangspeaks der beiden Komponenten ohne geladene Gruppen liegen. Dies ist von der Zunahme des Gehaltes an geladenen Gruppen abhängig. Gleichzeitig nimmt der Speichermodul E′ in einer Stufe ab, was im Gegensatz zu der zweistufigen Abnahme bei Proben ohne Ladungsträger steht.Die Zugfestigkeit nimmt in allen vier Polymermischungen mit der Zunahme an Acrylsäure (AA) in Poly(Styrol-Acrylsäue) PSAA zu, was in dem PU/PSAA Voll-IPN besonders deutlich wird.
    Notes: Opposite charges, namely tertiary amine and carboxyl groups, were introduced into polyurethane (PU) and polystyrene (PS), respectively, to prepare PU/PS interpenetrating polymer networks (IPNs) by means of simultaneous bulk polymerization. Four IPNs were synthesized: a full-IPN, two semi-IPNs and a linear blend. The effect of charge groups on the mechanical properties and morphology of the four polymer alloys was investigated.It is found that the PU/PS IPN which was incorporated with charge groups is free of any phase-separation, and sufficiently uniformly distributed, as can be seen from the corresponding scanning electron microscopy (SEM) photographs. Dynamic mechanical analysis indicates that the transition peak of the loss modulus E″ will move towards the centre between the two transition peaks of both components in the absence of charge groups, as a function of an increase in the contents of the opposite charge groups. Meanwhile the storage modulus E′ will decrease in a single-stage way from the previous two-stage mode.The tensile strength in all the four polymer alloys increased markedly along with an increase in the contents of acrylic acid (AA) in the poly(styrene-acrylic acid) (PSAA), which clearly can be seen for the PU/PSAA full-IPN.
    Additional Material: 4 Ill.
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    URL: http://dx.doi.org/10.1002/apmc.1989.051680112
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    Eine Studie über den Pyrolysevorgang bei organischen Bindemittelsubstanzen für die Herstellung von Kohlenstoffmaterialien (1989)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 168 (1989), S. 157-168 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Pyrolysis behaviour and coke characteristics of different precursors for carbon processing: thermosetting resins (resol, novolak), hydrolytic lignin, pitch, tar as well as their blends were studied using differential thermal analysis (DTA) and X-ray diffraction techniques. The blends novolak-pitch, resol-tar and resol-hydrolytic lignin show a higher coke yield after carbonisation up to 1000°C compared to the corresponding individual substances. A good correlation between the integral procedural decomposition temperature T*A of the investigated precursors and their coke yield is found.
    Notes: Mittels Thermo- und Röntgenstrukturanalyse wird eine vergleichende Untersuchung des Pyrolysevorganges und der Mikrostruktur des aus zwei Gruppen organischer Bindemittel und deren Mischungen gewonnenen Koksrückstandes durchgeführt. Gruppe I umfaßt reine und mit Hydrolyselignin gefüllte Resol- und Novolak-Phenol-Formaldehydharze und Gruppe II Steinkohlenpech und -teer. Es wird festgestellt, daß sich die Mischungen Novolakharz-Pech, Resolharz-Teer und Resolharz-Hydrolyselignin beim Erhitzen nicht wie mechanische Gemische verhalten und eine erhöhte Ausbeute an Koksrückstand liefern. Weiterhin wird gefunden, daß die integrale Endtemperatur der Pyrolyse (T*A) dieser Substanzen als quantitatives Maß für die Ausbeute an Koksrückstand im Anschluß an die Carbonisierung der Proben dienen kann.
    Additional Material: 4 Ill.
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    4,4′-carbo(4,4′-bismaleimido phenoxy)diphenyl silane: Synthesis and characterization (1989)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 168 (1989), S. 217-223 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The paper describes the successful synthesis of silicon containing bismaleimide resin 4,4′-carbo(4,4′-bismaleimido phenoxy)diphenyl silane. The char yield of the bismaleimide resin in N2 atmosphere was found to be 55% at 800°C. Chain extension of bismaleimide with 4,4′-diamino diphenyl sulfone reduced the char yield and thermal stability.
    Additional Material: 3 Ill.
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    URL: http://dx.doi.org/10.1002/apmc.1989.051680118
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    Zur statistik des einbaus einer als regler in polyamid 12 verwendeten aliphatischen dicarbonsäureHerrn Prof. Dr. Dr. h. c. H. Hellmann zum 75. Geburtstag gewidmet. (1989)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 169 (1989), S. 193-209 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: As hard blocks in polyether block amides, polyamides are used whose length is intensively regulated by dicarboxylic acids. Since, with regard to melting and crystallization behaviour, this acid constitutes an interfering structural unit in the chain, and in the case of a completely converted product each chain contains one acid molecule, it is essential to know where in the chain incorporation will occur. As opposed to monofunctional chain regulators which always form a chain end, a bifunctional chain regulator can a priori also be randomly incorporated into the inner part of the chain. This leads to a far greater interference than occurs if the chain regulator molecule and the chain end, which acts as an interfering unit in any case, coincide with each other.By means of adipic acid-regulated oligoamides based on lauryl lactam, the incorporation of the chain regulator was examined by NMR spectroscopy and compared with model calculations. This resulted in a close match only if it was presupposed that the incorporation was carried out randomly with the same degree of probability at any point whatsoever between two lauryl lactam structural units or at the chain end.Further calculations illustrate the effects of the incorporation of the chain regulator on the size of the amorphous portion.
    Notes: Als Hartblöcke in Polyetherblockamiden werden durch Dicarbonsäuren stark geregelte Polyamide eingesetzt. Da die Säure in Hinblick auf das Schmelz- und Kristallisationsverhalten einen Störbaustein in der Kette darstellt und bei einem ausgeregelten Produkt jede Kette ein Säuremolekül enthält, ist es von Bedeutung zu wissen, wo in der Kette der Einbau erfolgt. Anders als bei monofunktionellen Reglern, wo der Regler stets ein Kettenende bildet, kann ein bifunktioneller Regler a priori auch statistisch im Inneren der Kette eingebaut werden. Dies führt zu einer viel stärkeren Störung, als wenn das Reglermolekül und das sowieso als Störstelle wirkende Kettenende zusammenfallen. Anhand adipinsäuregeregelter Oligoamide auf Basis von Laurinlactam wird kernresonanzspektroskopisch der Einbau des Reglers untersucht und mit Rechnungen verglichen. Es ergibt sich nur dann gute Übereinstimmung, wenn vorausgesetzt wird, daß der Einbau statistisch erfolgt und dabei mit gleicher Wahrscheinlichkeit für jede beliebige Stelle zwischen zwei Laurinlactambausteinen oder am Kettenende abläuft. Weitere Rechnungen verdeutlichen den Einfluß des Reglereinbaus auf die Größe des amorphen Anteils.
    Additional Material: 6 Tab.
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    URL: http://dx.doi.org/10.1002/apmc.1989.051690118
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    Effect of copolymers modifying PVC on its physical and mechanical properties and its UV-radiation resistance, IX. Photodeformation of surface of pure PVC films and films containing MMA/MA and traces of cyclohexanone (1989)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 169 (1989), S. 185-192 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Auf Grund von mikroskopischen Beobachtungen wurde festgestellt, daß unter dem Einfluß von UV-Strahlung die Oberfläche von PVC-Filmen einer Formveränderung unterliegt. Auf der Oberfläche erscheinen Bläschen und Löcher. Die sich absondernden Gasprodukte der Polymerfotodestruktion verursachen die Bildung dieser Bläschen und Löcher. Größere Oberflächenänderungen wurden in Filmen mit einem Zusatz von 1-5% eines MMA/MA-Copolymeren beobachtet. Das weist auf eine in diesem Modifikator stattfindende Photoabbaureaktion hin, deren Ergiebigkeit größer ist als in reinem PVC. Dieser Modifikator wird in PVC eingeführt, um die Filmoberfläche zu verbessern, beschleunigt allerdings ihre Zerstörung unter dem Einfluß von UV-Strahlung. Es wurde festgestellt, daß Cyclohexanonspuren in den Proben den Photoabbau von MMA/MA retardieren, diesen Prozeß in PVC aber beschleunigen.
    Notes: By means of microscopic observation, the deformation of the surface of PVC films caused by 253.7 nm UV radiation was investigated. Numerous blisters and holes were formed by the gaseous photodecomposition products of the polymer.More apparent deformation of the films containing MMA/MA suggests that the photodecomposition of this modifier occurs with higher efficiency than that of PVC.MMA/MA copolymer is introduced into PVC films to improve the smoothness of their surface, but this modifier accelerates the deformation of this surface under UV irradiation. It was also found that traces of cyclohexanone in samples retard the photodecomposition of MMA/MA and accelerate this process in PVC.
    Additional Material: 7 Ill.
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    URL: http://dx.doi.org/10.1002/apmc.1989.051690117
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    Synthetic resins VIII. Preparation and characterization of p-aminoacetophenone/substituted benzoic acid/formaldehyde resins (1989)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 170 (1989), S. 29-41 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Eine Anzahl von Harzen wurde durch gemeinsame Kondensation von p-Aminoacetophenon (p-AAph), substituierten Benzoesäuren wie m-Tolylsäure (m-TA), o-Tolylsäure (o-TA), Phthalsäure (PhA), p-Nitrobenzoesäure (p-NBA), p-Chlorbenzoesäure (p-CIBA) und Formaldehyd (F) in Gegenwart von verschiedenen Säuren und Basen als Katalysatoren hergestellt. Die Harze wurden IR-spektroskopisch charakterisiert. Die Löslichkeitsparameter wurden gemäß Small's Gruppenbeteiligung berechnet; sie stimmen gut mit den experimentellen Werten überein. Das thermische Verhalten und die bakteriologischen Eigenschaften der Harze wurden auch untersucht.
    Notes: A number of resins has been prepared by condensing p-amino-acetophenone (p-AAph) with substituted benzoic acid such as m-toluic acid (m-TA), o-toluic acid (o-TA), phthalic acid (PhA), p-nitrobenzoic acid (p-NBA), p-chlorobenzoic acid (p-CIBA) and formaldehyde (F) in presence of some acids and bases as catalysts. The resins were characterized by infrared spectra of the characteristic groups. The solubility parameters were calculated from Small's group contribution which agreed well with the experimental values. The thermal behaviour and the bacteriological properties of the resins have also been investigated.
    Additional Material: 3 Ill.
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    URL: http://dx.doi.org/10.1002/apmc.1989.051700102
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    Liquid crystals in biological systemsPaper presented at the meeting of the GDCh-Fachgruppe “Makromolekulare Chemie” on “Polymers and Biological Functions” in Bad Nauheim (Federal Republic of Germany) on April 18/19, 1988. (1989)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 166 (1989), S. 81-108 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Notwithstanding their more common beginnings, liquid crystals and molecular biology developed mainly parallel and independently during the last one hundred years.Molecule-phase relationships on the one and complex static-dynamic treatments on the other hand seem to forward mutually integrative views in our days.Biomesogen approaches will deepen our insights into the spatio-temporal coherences of biological systems. They might contribute significantly to the understanding of life processes.
    Additional Material: 23 Ill.
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    URL: http://dx.doi.org/10.1002/apmc.1989.051660106
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    Ordering and organization in ionic solutions and emulsionsPaper presented at the meeting of the GDCh-Fachgruppe “Makromolekulare Chemie” on “Polymers and Biological Functions” in Bad Nauheim (W. Germany) on April 18/19 1988. (1989)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 166 (1989), S. 111-130 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Recent studies on ionic distribution in solutions and in suspensions were reviewed. Suspensions of latex particles, which were large enough to be seen under an ultramicroscope, were investigated by the 2-D Fourier transformation. The micrograph showing ordered structures gave discrete scattering spots, whereas those of disordered arrangements displayed no spots or halos. The two-state structure gave a limited number of halo, confirming our previous conclusion that the very frequently observed single, broad scattering peak was reminiscent of some kind of ordering of solute species. By using an image data analyser, the crystallization process was shown to follow the Ostwald ripening mechanism. The concurrent study by the quasi elastic light scattering method and by the Fourier analysis gave consistent scattering profiles, which indicated that the ordering phenomena took place in the entire volume of suspensions. The scattering intensity (correctly the lattice factor) was calculated for cubic systems with paracrystalline distortion. The peak intensity was lowered by enhanced distortion, while the peak position itself was not affected. This justifies our previous treatment of the single, broad peak in terms of the Bragg equation. The experimentally found scattering curve was compared with this theoretical calculation; the degree of distortion was evaluated.
    Additional Material: 14 Ill.
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    URL: http://dx.doi.org/10.1002/apmc.1989.051660108
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    Übermolekulare flüssigkristalline strukturen von hochkonzentrierten cellulosederivatlösungenVortrag anläßlich der Tagung der Fachgruppe “Makromolekulare Chemie” der Gesellschaft Deutscher Chemiker über “Polymere und biologische Funktionen” in Bad Nauheim am 18. und 19. April 1988. (1989)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 166 (1989), S. 131-138 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Lyotropic liquid crystalline phases of cellulose derivatives were explored as an analytical tool. Molar mass dependent measurements of the helicoidal cholesteric pitch of a cellulose tricarbanilate/solvent system may be used to determine the molar mass of this derivative by optical means. The compatibility of a ternary liquid crystalline system can be adequately investigated by a study of the supermolecular structure with spectroscopic measurements.
    Additional Material: 7 Ill.
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    URL: http://dx.doi.org/10.1002/apmc.1989.051660109
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    Preparation and characterization of microdisperse bioavailable carotenoid hydrosolsPaper presented at the meeting of the GdCH-Fachgruppe “Makromolekulare Chemie” on “Polymers and Biological Functions” in Bad Nauheim (West Germany) on April 18/19, 1988. (1989)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 166 (1989), S. 139-153 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The application of carotenoids as natural additives in various water-based or water-compatible formulations for the pigmentation of foods and feeds is seriously hampered by their insolubility in aqueous systems.Therefore, in order to develop the full potential of colour strength and to achieve a high degree of bioavailability during gastro intestinal passage, the coarse crystalline material has to be transformed into a microdisperse state.Exemplified with β-carotene, a novel non-mechanical process is described that transforms the carotenoids into a colloidal hydrosol characterized by an average particle size of about 0.1 μm.The process is based on the preparation of a transient high temperature solute state of the carotenoid in a water-miscible solvent, coupled with succeeding rapid aqueous precipitation in the presence of a stabilizing polymer colloid. The obtained hydrosols are characterized by photon-correlation-spectroscopy(size), and microelectrophoresis(colloidal stabilization).The bioavailability was tested by monitoring plasma levels of β-carotene in veal calves.
    Additional Material: 8 Ill.
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    URL: http://dx.doi.org/10.1002/apmc.1989.051660110
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    Bioresorbable polymers for temporary therapeutic applicationsPaper presented at the meeting of the GDCh-Fachgruppe “Makromolekulare Chemie” on “Polymers and Biological Functions” in Bad Nauheim (West-Germany) on April 18/19, 1988. (1989)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 166 (1989), S. 155-168 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Polymer science is mature enough to allow one to think about tailor-making macromolecular compounds aimed at interacting purposely with living systems. Reasons for developing bioresorbable polymers for temporary therapeutic applications are discussed with respect to property adjustments and economical factors. The field of the applications is first described and guidelines for tailor-making multimeric macromolecules with desired properties are presented. The approach led to focuss investigations on poly(α-hydroxy acids) and functional poly(β-hydroxy acids) derived from natural hydroxy acids, namely lactic, glycolic and malic acids. Physical, mechanical and biological properties of some corresponding polymers and copolymers are presented. Last but not least, examples of applications currently investigated are recalled.
    Additional Material: 1 Ill.
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    URL: http://dx.doi.org/10.1002/apmc.1989.051660111
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    Phospholipid polymers & new haemocompatible materialsPaper presented at the meeting of the GDCh-Fachgruppe “Makromolekulare Chemie” on “Polymers and biological Functions” in Bad Nauheim (West Germany) on April 18/19, 1988. (1989)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 166 (1989), S. 169-178 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: When blood comes into contact with an artificial surface, a number of events occur which include protein adsorption, platelet activation and the activation of the intrinsic pathway of blood coagulation. With the increased application of blood containing artificial devices, there is a great demand to develop new biomaterials which retard thrombus formation. Our new approach to solving this problem is to mimic the non-thrombogenic surface of natural biological membranes at least in a simple form. We have developed a polymerisable phospholipid and polyesters based on the major phospholipid polar head group present on the erythrocyte outer membrane surface. The coagulation of blood exposed to these polymers was examined by the technique of Material Thrombelastography, a relatively simple test for the in vitro screening of polymer thrombogenicity. We present results which indicate that the polymerised phospholipid and polyesters show reduced thrombogenicity, and may therefore have potential for future biomaterials.
    Additional Material: 4 Ill.
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    URL: http://dx.doi.org/10.1002/apmc.1989.051660112
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    Modifizierung von polymeroberflächen zur erhöhung der zelladhäusionVortrag anläßlich der Tagung der Fachgruppe “Makromolekulare Chemie” der Gesellschaft Deutscher Chemiker über “Polymere und biologische Funktionen” in Bad Nauheim am 18. und 19. April 1988 (1989)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 166 (1989), S. 179-189 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: After implantation a stable bond between the implant and the surrounding tissue is required. Therefore a high cell adhesion of the polymer surface of the implant must be achieved. Depending on the treatment time of a polydimethylsiloxane foil with oxygen plasma, the cell adhesion can be improved. FT-IR spectroscopy and ESCA analysis were used to characterize the surface modification. The cell spreading and cell adhesion increase with increasing hydrophilic character of the polymer surface after plasma treatment. A pronounced correlation was found between the efficiency of DNA and protein content, characterizing cell growth, and the spreading of the cells.Polydimethylsiloxane, Glow-Discharge, Surface Modification, Cell Adhesion, Cell Proliferation.
    Additional Material: 6 Ill.
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    URL: http://dx.doi.org/10.1002/apmc.1989.051660113
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    Explorations in cell biology and pharmacology using synthetic polymersPaper presented at the meeting of the GDCh-Fachgruppe “Makromolekulare Chemie” on “Polymers and Biological Functions” in Bad Nauheim (West-Germany) on April 18/19, 1988. (1989)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 166 (1989), S. 191-200 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: We have used synthetic polymers as tools to probe endocytosis and lysosome function. Their particular value lies in their well-defined chemical constitution and in the possibility to custom-synthesize molecules with desired characteristics. Polyvinylpyrrolidone, Percoll and polystyrene beads have been 125I-labelled and used to explore the borderland of pinocytosis and phagocytosis. Derivatized poly(aspartamide), poly(hydroxypropylmethacrylamide) and a polylysine-poly(ethylene oxide) block copolymer have been used to investigate the effects of hydrophobic moieties and sugar residues on substrate-selection in pinocytosis. The effect of cationic moieties has been studied using vinylpyrrolidone-vinylamine copolymers.Poly(hydroxypropylmethacrylamide) with certain oligopeptide side---chains have been shown to be susceptible to lysosomal peptidases. Ethylene glycol oligomers are being used to study the basal permeability of the lysosome membrane.Soluble macromolecules have considerable potential in targeted drug-delivery. Drugs attached to appropriate polymers by covalent links that are susceptible to lysosomal enzymes can deliver drug to target cells and avoid unwanted sideeffects. Synthetic macromolecules have several advantages over their natural counterparts: they are chemically more robust, less immunogenic, and easier and cheaper to prepare in bulk.
    Additional Material: 1 Ill.
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    URL: http://dx.doi.org/10.1002/apmc.1989.051660114
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    Polymere in der diagnostikVortrag anläßlich der Tagung der Fachgruppe “Makromolekulare Chemie” der Gesellschaft Deutscher Chemiker uber “Polymere und biologische Funktionen” in Bad Nauheim am 18. und 19. April 1988. (1989)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 166 (1989), S. 201-226 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Diagnostics are e. g. reagents or combinations of reagents or measure bloodcomponents down to concentrations of 10-15 mol/1 in reproducable form. To achieve this target diagnostics have to fullfill special requirements in purity, uniformity, producibility and reproducibility. These requirements are also valid for integrated polymers and plastics. Examples of the application of polymers and plastics in diagnostics are e. g. materials for the blood-plasma-separation, the stabilization of proteins, solid phases in immunoassays as reagent tubes, microtiterplates and latexparticles.Reciprocal actions between polymers, plastics, polymer additives, blood and bloodsubstances like proteins in diagnostic tests can be seen as indications to similar effects by the intracorporeal applications of plastics in surgery and in general for contacts of natural materials with plastics, as usual in the foodpacking.
    Additional Material: 19 Ill.
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    URL: http://dx.doi.org/10.1002/apmc.1989.051660115
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    The application of immobilized affinity ligands in high performance liquid chromatographyPaper presented at the meeting of the GDCh-Fachgruppe “Makromolekulare Chemie” on “Polymers and Biological Functions” in Bad Nauheim (West Germany) on April 18/19, 1988. (1989)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 166 (1989), S. 249-256 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Using Eupergit, a synthetic resin, as an example, the necessary characteristics of a support for high performance affinity chromatography (HPAC) are demonstrated. To such a support different ligands can be immobilized and used for the separation of biopolymers.From the range of possible applications a few examples are chosen. Immunoglobulins are isolated in one step by protein A-HPAC, the purified antibodies are immobilized and applied to immunoaffinity-HPLC for the isolation of corresponding antigens. Concanavalin A-HPAC of membrane proteins was chosen to represent chromatography with immobilized lectins. Antithrombin could be isolated from human plasma by the use of immobilized heparin. HPAC has the advantage of affinity chromatography, which is above all highly specific. As the support is resistant to high pressure and has well defined microparticles with a particular pore size, it provides a much higher yield at considerable flow rates. The handling of materials like this is simpler, the separation of the sample is quicker and can be reproduced more easily.
    Additional Material: 5 Ill.
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    URL: http://dx.doi.org/10.1002/apmc.1989.051660117
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    Makromolekulare schalter für doppelschichtmembranen (1989)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 166 (1989), S. 257-272 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Controlled polyelectrolyte adsorption can be used to render phospholipid bilayer membranes sensitive to physical and chemical signals. We describe in this paper the design and construction of macromolecular switches for bilayer membranes, which can be used to create lipid vesicles that release their contents rapidly and quantitatively in response to changes in pH, temperature, light intensity or glucose concentration. The kinetics and mechanisms of the molecular switching processes observed in such systems are also discussed.
    Notes: Kontrollierte Adsorption von Polyelektrolyten kann ein wirksames Werkzeug im Design von dünnen molekularen Filmen sein. Man kann erwarten, daß die Adsorption von Polyelektrolytketten das empfindliche Kräftegleichgewicht erheblich beeinflußt, das die strukturellen und funktionellen Eigenschaften von geordneten Strukturen wie Einzel-, Doppel- und Mehrfachschichten bestimmt. Andererseits ist die Adsorption von Polyelektrolyten außerordentlich sensitiv auf Umgebungsparameter, z.B. pH, Temperatur oder lonenstärke. Kontrollierte Adsorption kann daher zu Sensitivität auf bestimmte chemische oder physikalische Stimuli führen, sodaß auf diese Weise ein molekularer Schaltmechanismus entworfen werden kann. Durch Umsetzen dieser ldee in reale Systeme gelang es uns, molekulares Schalten in Mischungen von Poly(2-ethylacrylsäre) mit natürlichen oder synthetischen Phosphatidylcholinen zu bewirken. Insbesondere haben wir Phosphatidylcholinvesikel hergestellt, die ihren lnhalt nach einer Änderung von pH, Temperatur, Glukosekonzentration oder nach Bestrahlung mit Licht schnell und quantitativ freisetzen. Die Entwicklung und die Herstellung von Doppelschichtmembranen, die auf solche Änderungen reagieren, sowie die Kinetik und der Mechanismus des damit verbundenen molekularen Schaltprozesses werden im vorliegenden Artikel diskutiert.
    Additional Material: 9 Ill.
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    URL: http://dx.doi.org/10.1002/apmc.1989.051660118
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    Preparation, properties and uses of polymer-enzyme conjugatesPaper presented at the meeting of the GDCh-Fachgruppe “Makromolekulare Chemie” on “Polymers and Biological Functions” in Bad Nauheim (West Germany) April 18/19, 1988 (1989)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 166 (1989), S. 227-247 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Enzymes can be immobilized by gel entrapment, by microencapsulation, by physical or ionic adsorption, by covalent binding to inorganic or organic carriers, or by whole cell immobilization. Of particular interest is the large number of chemical reactions developed for the covalent binding of enzymes via their nonessential functional groups to inorganic carriers such as glass, ceramics and iron, to natural polymers such as cellulose and Sepharose, and to synthetic polymers such as nylon, polyacrylamide, and other vinyl polymers and copolymers possessing reactive chemical groups. The stability of certain enzymes is markedly increased on their immobilization. It was thus possible to transform the biologically active polymer derivatives into active enzyme beads, enzyme capsules, enzyme columns and enzyme membranes and these enabled the construction of enzyme reactors such as the batch-stirred tank reactors, the continuous packed bed reactors, and fluidized bed reactors. So far mainly immobilized hydralases and isomerases are being used in industry on a large scale. It seems likely, however, that once adequate techniques become available for cofactor recycling, the use of immobilized enzymes will be extended to other organic reactions, particularly those involving stereospecific synthesis of simple or complex organic molecules. Among the industrial processes in which immobilized enzymes are being used, it is worth mentioning the industrial-scale continuous production of fructose enriched syrup from glucose by immobilized glucose-isomerase, the batch process for the production of 6-aminopenicillanic acid (6-APA) from penicillin G with the aid of immobilized penicillin amidase; the production of aspartame from aspartic acid and phenylalanine by immobilized thermoase; the large scale production of optically active amino acids with immobilized amino acid acylase; and the large scale production and application of immobilized lactase for the hydrolysis of lactose. The recently developed process for acrylamide production using immobilized nitrilase containing microbial cells should also be referred to. The successful use of an NAD-polyethylene glycol conjugate (NAD-PEG) as a nondialyzable water-soluble coenzyme derivative in the enzymic synthesis of leucine from α-ketoisocaproic acid and ammonia, in a membrane-enclosed reactor containing L-leucine dehydrogenase, NAD-PEG, formate and formate dehydrogenase, illustrates the new possibilities opened up by making use of cofactor-polymer conjugates. The use of enzyme-polymer conjugates in analytical and clinical is also illustrated.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1989.051660116
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  • 97
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    Die nutzung gentechnischer methoden zur produktion wertvoller proteine in mikroorganismenVortrag anläßlich der Tagung der Fachgruppe “Makromolekulare Chemie” der Gesellschaft Deutscher Chemiker uber “Polymere und biologische Funktionen” in Bad Nauheim am 18. und 19. April 1988. (1989)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 166 (1989), S. 273-291 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The genetic make-up of living systems especially of isolated cells can be altered by a variety of methods including chemical or light-induced mutation. More modern procedures are the in vitro recombination of nucleic acids and the cell-cell fusion.The new methods are especially useful to reprogram microorganisms to produce valuable proteins or other natural products in excess quantties. In the following we will elucidate the importance of the new techniques by describing the bacterial production of glucose dehydrogenase, of the proteinase inhibitor stefin A and by outlining the methods and promisses of substractive cloning. Although the economic value of genetic engineering techniques still awaits justification, the importance of the methodology for basic biological research is well documented.
    Additional Material: 12 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1989.051660119
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  • 98
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    Polymers for the immobilization of whole cells and their application in biotechnologyPaper presented at the meeting of the GDCh-Fachgruppe “Makromolekulare Chemie” on “Polymers and Biological Functions” in Bad Nauheim (West-Germany) on April 18/19, 1988. (1989)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 166 (1989), S. 293-309 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Immobilization of whole cells has become an efficient tool for biosynthesis, biotransformation and analysis. High cell density, high operational stability, easy handling, propably in continuous systems, and multiple reuse are important advantages of immobilized cells. In comparison to other methods like adsorption, crosslinking and encapsulation, the entrapment within a polymeric network is the most widely applied technique in heterogeneous biocatalysis. For immobilizing mammalian cells nearly exclusively the adsorption onto micorcarriers is used. Requirements for the polymers to be used in such immobilized cell systems are discussed in detail.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1989.051660120
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  • 99
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    Synthesis and evaluation of pyridazines in natural rubber (1989)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 168 (1989), S. 1-8 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Vier Pyridazinderivate wurden synthetisiert und als Beschleuniger für Naturkautschukmischungen entwickelt. Die rheologischen Eigenschaften wurden mit Hilfe eines Monsanto Rheometers 100 bestimmt. Die rheometrischen Daten wurden für die Berechnung der kinetischen Konstanten der Vulkanisationsreaktion in Anwesenheit der synthetisierten Verbindungen benutzt. Verglichen mit Mercaptobenzthiazol (MBT), einem Beschleuniger der häufig in der Kautschukindustrie eingesetzt wird, zeigten diese Verbindungen eine gute Beschleunigerwirksamkeit.
    Notes: Four pyridazine derivatives were synthesized and evaluated as accelerators in natural rubber (NR) mixes. The rheological characteristics were determined by a Monsanto Rheometer 100. The kinetic constants for the vulcanization reaction in the presence of the synthetic compounds were calculated using the rheometric data. The compounds showed a good accelerating efficiency compared with mercaptobenzothiazole (MBT), which is widely used in rubber industry.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1989.051680101
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  • 100
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    Some kinetic features of the initial stage of acid catalyzed polycondensation of furfuryl-alcohol and formaldehyde, IIIPart II cf. lit.2. (1989)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 170 (1989), S. 173-182 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Die Ansammlung von als inaktiv angenommenen „Dimeren“ und „Trimeren“ sowie der Verbrauch von aktiven Spezies mit der Reaktionszeit im säurekatalysierten Furfurylalkohol (FA)/Formaldehyd (F) System wurde durch GPC-Technik unter Anwendung eines Doppeldetektors bewiesen.Ein Reaktionsmechanismus wurde für den Kondensationsprozeß vorgeschlagen, der einige Widersprüche der bisherigen Untersuchungen erklären kann.
    Notes: Accumulation of “dimers” and “trimers” considered to be inactive and consumption of active ones with reaction time in furfuryl-alcohol (FA)/formaldehyde (F) acid catalyzed condensation system was proved by GPC technique using double detector.A reaction mechanism was proposed for the condensation process explaining some contradictions of investigations collected so far.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1989.051700113
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