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  • Articles  (123)
  • Amino Acid Sequence  (123)
  • American Association for the Advancement of Science (AAAS)  (123)
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  • Articles  (123)
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  • American Association for the Advancement of Science (AAAS)  (123)
  • American Geophysical Union
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  • 1
    Publication Date: 1997-11-05
    Description: Reactive and potentially toxic cofactors such as copper ions are imported into eukaryotic cells and incorporated into target proteins by unknown mechanisms. Atx1, a prototypical copper chaperone protein from yeast, has now been shown to act as a soluble cytoplasmic copper(I) receptor that can adopt either a two- or three-coordinate metal center in the active site. Atx1 also associated directly with the Atx1-like cytosolic domains of Ccc2, a vesicular protein defined in genetic studies as a member of the copper-trafficking pathway. The unusual structure and dynamics of Atx1 suggest a copper exchange function for this protein and related domains in the Menkes and Wilson disease proteins.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Pufahl, R A -- Singer, C P -- Peariso, K L -- Lin, S J -- Schmidt, P J -- Fahrni, C J -- Culotta, V C -- Penner-Hahn, J E -- O'Halloran, T V -- GM-38047/GM/NIGMS NIH HHS/ -- GM-50016/GM/NIGMS NIH HHS/ -- GM-54111/GM/NIGMS NIH HHS/ -- R01 GM054111/GM/NIGMS NIH HHS/ -- etc. -- New York, N.Y. -- Science. 1997 Oct 31;278(5339):853-6.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Chemistry, Northwestern University, Evanston, IL 60208, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9346482" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; *Carrier Proteins ; *Cation Transport Proteins ; Copper/*metabolism ; Escherichia coli ; Fungal Proteins/metabolism/*physiology ; Humans ; Molecular Chaperones/*physiology ; Molecular Sequence Data ; Recombinant Proteins ; Saccharomyces cerevisiae/metabolism/*physiology ; *Saccharomyces cerevisiae Proteins ; Sequence Homology, Amino Acid
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    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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    American Association for the Advancement of Science (AAAS)
    Publication Date: 1997-08-08
    Description: In addition to the RNA polymerases (RNAPs) transcribing the nuclear genes, eukaryotic cells also require RNAPs to transcribe the genes of the mitochondrial genome and, in plants, of the chloroplast genome. The plant Arabidopsis thaliana was found to contain two nuclear genes similar to genes encoding the mitochondrial RNAP from yeast and RNAPs of bacteriophages T7, T3, and SP6. The putative transit peptides of the two polymerases were capable of targeting fusion proteins to mitochondria and chloroplasts, respectively, in vitro. The results indicate that the mitochondrial RNAP in plants is a bacteriophage-type enzyme. A gene duplication event may have generated the second RNAP, which along with the plastid-encoded eubacteria-like RNAP could transcribe the chloroplast genome.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Hedtke, B -- Borner, T -- Weihe, A -- New York, N.Y. -- Science. 1997 Aug 8;277(5327):809-11.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Humboldt University Berlin, Institute of Biology, Chausseestrasse 117, D-10115 Berlin, Germany.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9242608" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Arabidopsis/*enzymology/genetics ; Cell Nucleus/genetics ; Chloroplasts/*enzymology ; Cloning, Molecular ; DNA-Directed RNA Polymerases/chemistry/*genetics ; Exons ; *Genes, Plant ; Introns ; Mitochondria/*enzymology ; Molecular Sequence Data ; Phylogeny ; Recombinant Fusion Proteins/metabolism ; Sequence Alignment ; T-Phages/enzymology
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    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 3
    Publication Date: 1997-07-04
    Description: Angiogenesis is thought to depend on a precise balance of positive and negative regulation. Angiopoietin-1 (Ang1) is an angiogenic factor that signals through the endothelial cell-specific Tie2 receptor tyrosine kinase. Like vascular endothelial growth factor, Ang1 is essential for normal vascular development in the mouse. An Ang1 relative, termed angiopoietin-2 (Ang2), was identified by homology screening and shown to be a naturally occurring antagonist for Ang1 and Tie2. Transgenic overexpression of Ang2 disrupts blood vessel formation in the mouse embryo. In adult mice and humans, Ang2 is expressed only at sites of vascular remodeling. Natural antagonists for vertebrate receptor tyrosine kinases are atypical; thus, the discovery of a negative regulator acting on Tie2 emphasizes the need for exquisite regulation of this angiogenic receptor system.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Maisonpierre, P C -- Suri, C -- Jones, P F -- Bartunkova, S -- Wiegand, S J -- Radziejewski, C -- Compton, D -- McClain, J -- Aldrich, T H -- Papadopoulos, N -- Daly, T J -- Davis, S -- Sato, T N -- Yancopoulos, G D -- New York, N.Y. -- Science. 1997 Jul 4;277(5322):55-60.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Regeneron Pharmaceuticals Inc., 777 Old Saw Mill River Road, Tarrytown, NY 10591, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9204896" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Angiopoietin-1 ; Angiopoietin-2 ; Animals ; Blood Vessels/embryology/*metabolism ; Cells, Cultured ; Cloning, Molecular ; Embryo, Mammalian/metabolism ; Endothelial Growth Factors/genetics/metabolism ; Endothelium, Vascular/*cytology/metabolism ; Female ; Humans ; Ligands ; Lymphokines/genetics/metabolism ; Membrane Glycoproteins/antagonists & inhibitors/metabolism ; Mice ; Mice, Transgenic ; Molecular Sequence Data ; *Neovascularization, Physiologic ; Phosphorylation ; Proteins/chemistry/*metabolism ; Rats ; Rats, Sprague-Dawley ; Receptor Protein-Tyrosine Kinases/*antagonists & inhibitors/metabolism ; Receptor, TIE-2 ; Recombinant Fusion Proteins/metabolism ; Signal Transduction ; Vascular Endothelial Growth Factor A ; Vascular Endothelial Growth Factors
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    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 4
    Publication Date: 1997-04-18
    Description: The crystal structure of the adenine nucleotide exchange factor GrpE in complex with the adenosine triphosphatase (ATPase) domain of Escherichia coli DnaK [heat shock protein 70 (Hsp70)] was determined at 2.8 angstrom resolution. A dimer of GrpE binds asymmetrically to a single molecule of DnaK. The structure of the nucleotide-free ATPase domain in complex with GrpE resembles closely that of the nucleotide-bound mammalian Hsp70 homolog, except for an outward rotation of one of the subdomains of the protein. This conformational change is not consistent with tight nucleotide binding. Two long alpha helices extend away from the GrpE dimer and suggest a role for GrpE in peptide release from DnaK.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Harrison, C J -- Hayer-Hartl, M -- Di Liberto, M -- Hartl, F -- Kuriyan, J -- New York, N.Y. -- Science. 1997 Apr 18;276(5311):431-5.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Laboratories of Molecular Biophysics and Howard Hughes Medical Institute, Rockefeller University, 1230 York Avenue, New York, NY 10021, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9103205" target="_blank"〉PubMed〈/a〉
    Keywords: Adenosine Diphosphate/metabolism ; Adenosine Triphosphatases/*chemistry/metabolism ; Amino Acid Sequence ; Bacterial Proteins/*chemistry/metabolism ; Binding Sites ; Crystallography, X-Ray ; Dimerization ; *Escherichia coli Proteins ; HSP70 Heat-Shock Proteins/*chemistry/metabolism ; Heat-Shock Proteins/*chemistry/metabolism ; Hydrogen Bonding ; Models, Molecular ; Molecular Chaperones/*chemistry/metabolism ; Molecular Sequence Data ; *Protein Conformation ; Protein Structure, Secondary
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  • 5
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    American Association for the Advancement of Science (AAAS)
    Publication Date: 1997-02-28
    Description: A gene encoding a zinc finger protein of the Snail family, cSnR, is expressed in the right-hand lateral mesoderm during normal chick development. Antisense disruption of cSnR function during the hours immediately preceding heart formation randomized the normally reliable direction of heart looping and subsequent embryo torsion. Implanted ectopic sources of intercellular signal proteins that are involved in establishing normal left-right information randomized the handedness of heart development and also altered the asymmetry of cSnR expression. cSnR thus appears to act downstream of these signals, or perhaps in parallel with the latest expressed of them, the Nodal protein, in controlling the anatomical asymmetry.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Isaac, A -- Sargent, M G -- Cooke, J -- New York, N.Y. -- Science. 1997 Feb 28;275(5304):1301-4.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉National Institute for Medical Research, Mill Hill, London NW7 1AA, UK.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9036854" target="_blank"〉PubMed〈/a〉
    Keywords: Activin Receptors ; Amino Acid Sequence ; Animals ; Body Patterning/*genetics ; Chick Embryo ; Culture Techniques ; DNA-Binding Proteins/chemistry/*genetics/physiology ; Embryonic Induction/genetics/physiology ; *Gene Expression Regulation, Developmental ; Heart/*embryology ; Hedgehog Proteins ; Levocardia/embryology/genetics ; Mesoderm/*metabolism ; Molecular Sequence Data ; Nodal Protein ; Oligonucleotides, Antisense ; Proteins/genetics/physiology ; RNA, Messenger/genetics/metabolism ; Receptors, Growth Factor/genetics/physiology ; Somites/metabolism ; *Trans-Activators ; *Transforming Growth Factor beta ; Up-Regulation ; Zinc Fingers/*genetics
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  • 6
    Publication Date: 1997-05-02
    Description: The neurofibromatosis type 1 (NF1) tumor suppressor protein is thought to restrict cell proliferation by functioning as a Ras-specific guanosine triphosphatase-activating protein. However, Drosophila homozygous for null mutations of an NF1 homolog showed no obvious signs of perturbed Ras1-mediated signaling. Loss of NF1 resulted in a reduction in size of larvae, pupae, and adults. This size defect was not modified by manipulating Ras1 signaling but was restored by expression of activated adenosine 3', 5'-monophosphate-dependent protein kinase (PKA). Thus, NF1 and PKA appear to interact in a pathway that controls the overall growth of Drosophila.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉The, I -- Hannigan, G E -- Cowley, G S -- Reginald, S -- Zhong, Y -- Gusella, J F -- Hariharan, I K -- Bernards, A -- NS22229/NS/NINDS NIH HHS/ -- NS34779/NS/NINDS NIH HHS/ -- NS36084/NS/NINDS NIH HHS/ -- etc. -- New York, N.Y. -- Science. 1997 May 2;276(5313):791-4.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Massachusetts General Hospital Cancer Center and Harvard Medical School Building 149, 13th Street, Charlestown, MA 02129, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9115203" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Animals ; Cell Count ; Cyclic AMP/metabolism ; Cyclic AMP-Dependent Protein Kinases/genetics/*metabolism ; Drosophila/cytology/*genetics/growth & development/metabolism ; *Drosophila Proteins ; GTP Phosphohydrolases/metabolism ; Genes, Insect ; Insect Proteins/chemistry/genetics/*metabolism ; Molecular Sequence Data ; Mutation ; *Nerve Tissue Proteins ; Neurofibromin 1 ; Phenotype ; Proteins/chemistry/genetics ; Recombinant Fusion Proteins/pharmacology ; Signal Transduction ; *ras GTPase-Activating Proteins ; ras Proteins/metabolism
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  • 7
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    American Association for the Advancement of Science (AAAS)
    Publication Date: 1997-10-27
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉DeGrado, W F -- New York, N.Y. -- Science. 1997 Oct 3;278(5335):80-1.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Biochemistry and Biophysics, University of Pennsylvania School of Medicine, Philadelphia, PA 19104-6059, USA. wdegrado@mail.med.upenn.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9340760" target="_blank"〉PubMed〈/a〉
    Keywords: *Algorithms ; Amino Acid Sequence ; Computer Simulation ; DNA-Binding Proteins/chemical synthesis/*chemistry ; Models, Molecular ; *Protein Conformation ; *Protein Engineering ; Protein Folding ; Protein Structure, Tertiary ; Software ; Thermodynamics ; Transcription Factors/chemical synthesis/*chemistry ; Zinc Fingers
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  • 8
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    American Association for the Advancement of Science (AAAS)
    Publication Date: 1997-11-14
    Description: Pathogenic Yersinia species have a specialized secretion system (type III) to target cytotoxic Yop proteins during infection. The signals of YopE and YopN sufficient for the secretion of translational reporter fusions were mapped to the first 15 codons. No common amino acid or peptide sequence could be identified among the secretion signals. Systematic mutagenesis of the secretion signal yielded mutants defective in Yop translation; however, no point mutants could be identified that specifically abolished secretion. Frameshift mutations that completely altered the peptide sequences of these signals also failed to prevent secretion. Thus, the signal that leads to the type III secretion of Yop proteins appears to be encoded in their messenger RNA rather than the peptide sequence.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Anderson, D M -- Schneewind, O -- AI 07323/AI/NIAID NIH HHS/ -- New York, N.Y. -- Science. 1997 Nov 7;278(5340):1140-3.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Microbiology and Immunology, Molecular Biology Institute, University of California, Los Angeles, School of Medicine, 10833 Le Conte Avenue, Los Angeles, CA 90095, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9353199" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Bacterial Outer Membrane Proteins/chemistry/genetics/*secretion ; Bacterial Proteins/chemistry/genetics/*secretion ; Base Sequence ; Codon ; Frameshift Mutation ; *Membrane Proteins ; Molecular Sequence Data ; Mutation ; Nucleic Acid Conformation ; Point Mutation ; Protein Biosynthesis ; RNA, Bacterial/chemistry/*genetics/metabolism ; RNA, Messenger/chemistry/*genetics/metabolism ; Recombinant Fusion Proteins/biosynthesis/secretion ; Yersinia enterocolitica/*metabolism/pathogenicity
    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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  • 9
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    American Association for the Advancement of Science (AAAS)
    Publication Date: 1997-01-17
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Warren, S T -- New York, N.Y. -- Science. 1997 Jan 17;275(5298):408-9.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9005557" target="_blank"〉PubMed〈/a〉
    Keywords: Alleles ; Amino Acid Sequence ; Base Sequence ; *Crossing Over, Genetic ; Homeodomain Proteins/chemistry/*genetics ; Humans ; Molecular Sequence Data ; Mutation ; Peptides/analysis/*genetics ; Polydactyly/*genetics ; Syndactyly/*genetics ; *Transcription Factors ; Trinucleotide Repeats
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  • 10
    Publication Date: 1997-05-02
    Description: Circadian rhythmicity is universally associated with the ability to perceive light, and the oscillators ("clocks") giving rise to these rhythms, which are feedback loops based on transcription and translation, are reset by light. Although such loops must contain elements of positive and negative regulation, the clock genes analyzed to date-frq in Neurospora and per and tim in Drosophila-are associated only with negative feedback and their biochemical functions are largely inferred. The white collar-1 and white collar-2 genes, both global regulators of photoresponses in Neurospora, encode DNA binding proteins that contain PAS domains and are believed to act as transcriptional activators. Data shown here suggest that wc-1 is a clock-associated gene and wc-2 is a clock component; both play essential roles in the assembly or operation of the Neurospora circadian oscillator. Thus DNA binding and transcriptional activation can now be associated with a clock gene that may provide a positive element in the feedback loop. In addition, similarities between the PAS-domain regions of molecules involved in light perception and circadian rhythmicity in several organisms suggest an evolutionary link between ancient photoreceptor proteins and more modern proteins required for circadian oscillation.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Crosthwaite, S K -- Dunlap, J C -- Loros, J J -- GM 34985/GM/NIGMS NIH HHS/ -- MH01186/MH/NIMH NIH HHS/ -- MH44651/MH/NIMH NIH HHS/ -- New York, N.Y. -- Science. 1997 May 2;276(5313):763-9.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Biochemistry, Dartmouth Medical School, Hanover, NH 03755-3844, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9115195" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Biological Clocks/physiology ; Biological Evolution ; Circadian Rhythm/*physiology ; DNA, Fungal/metabolism ; DNA-Binding Proteins/chemistry/genetics/*physiology ; Feedback ; Fungal Proteins/genetics ; Gene Expression Regulation, Fungal ; Genes, Fungal ; Light ; Molecular Sequence Data ; Neurospora crassa/genetics/*physiology ; Phytochrome/metabolism ; Signal Transduction ; Temperature ; Transcription Factors/chemistry/genetics/*physiology ; *Transcriptional Activation
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    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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