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  • Mutation  (53)
  • Binding Sites  (49)
  • American Association for the Advancement of Science (AAAS)  (92)
  • American Association of Petroleum Geologists (AAPG)
  • International Union of Crystallography (IUCr)
  • 1990-1994  (92)
  • 1985-1989
  • 1990  (92)
Collection
Keywords
Publisher
  • American Association for the Advancement of Science (AAAS)  (92)
  • American Association of Petroleum Geologists (AAPG)
  • International Union of Crystallography (IUCr)
  • Springer  (1)
Years
  • 1990-1994  (92)
  • 1985-1989
Year
  • 1
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    Evidence of changes in protease sensitivity and subunit exchange rate on DNA binding by C/EBP (1990)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1990-08-17
    Description: The transcription factor C/EBP uses a bipartite structural motif to bind DNA. Two protein chains dimerize through a set of amphipathic alpha helices termed the leucine zipper. Highly basic polypeptide regions emerge from the zipper to form a linked set of DNA contact surfaces. In the recently proposed a "scissors grip" model, the paired set of basic regions begin DNA contact at a central point and track in opposite directions along the major groove, forming a molecular clamp around DNA. This model predicts that C/EBP must undertake significant changes in protein conformation as it binds and releases DNA. The basic region of ligand-free C/EBP is highly sensitive to protease digestion. Pronounced resistance to proteolysis occurred when C/EBP associated with its specific DNA substrate. Sequencing of discrete proteolytic fragments showed that prominent sites for proteolysis occur at two junction points predicted by the "scissors grip" model. One junction corresponds to the cleft where the basic regions emerge from the leucine zipper. The other corresponds to a localized nonhelical segment that has been hypothesized to contain an N-cap and facilitate the sharp angulation necessary for the basic region to track continuously in the major groove of DNA.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Shuman, J D -- Vinson, C R -- McKnight, S L -- New York, N.Y. -- Science. 1990 Aug 17;249(4970):771-4.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Howard Hughes Research Laboratories, Department of Embryology, Baltimore, MD 21210.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2202050" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Binding Sites ; CCAAT-Enhancer-Binding Proteins ; Chromatography, High Pressure Liquid ; DNA/*metabolism ; DNA-Binding Proteins/metabolism ; Kinetics ; Leucine ; Macromolecular Substances ; Models, Molecular ; Molecular Sequence Data ; Nuclear Proteins/*metabolism ; Peptide Fragments/metabolism ; Peptide Hydrolases/*metabolism ; Protein Conformation ; Transcription Factors/*metabolism ; Trypsin/metabolism
    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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    Site-specific cleavage of a yeast chromosome by oligonucleotide-directed triple-helix formation (1990)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1990-07-06
    Description: Oligonucleotides equipped with EDTA-Fe can bind specifically to duplex DNA by triple-helix formation and produce double-strand cleavage at binding sites greater than 12 base pairs in size. To demonstrate that oligonucleotide-directed triple-helix formation is a viable chemical approach for the site-specific cleavage of large genomic DNA, an oligonucleotide with EDTA-Fe at the 5' and 3' ends was targeted to a 20-base pair sequence in the 340-kilobase pair chromosome III of Saccharomyces cerevisiae. Double-strand cleavage products of the correct size and location were observed, indicating that the oligonucleotide bound and cleaved the target site among almost 14 megabase pairs of DNA. Because oligonucleotide-directed triple-helix formation has the potential to be a general solution for DNA recognition, this result has implications for physical mapping of chromosomes.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Strobel, S A -- Dervan, P B -- GM 42966/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 1990 Jul 6;249(4964):73-5.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Arnold and Mabel Beckman Laboratories of Chemical Synthesis, Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena 91125.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2195655" target="_blank"〉PubMed〈/a〉
    Keywords: Base Sequence ; Binding Sites ; Chromosomes, Fungal/*metabolism ; DNA, Fungal/*genetics/metabolism ; Densitometry ; Hydrogen-Ion Concentration ; Molecular Sequence Data ; Nucleic Acid Conformation ; Nucleic Acid Hybridization ; Oligonucleotides/*genetics/metabolism ; Saccharomyces cerevisiae/*genetics
    Print ISSN: 0036-8075
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  • 3
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    No specific recognition of leader peptide by SecB, a chaperone involved in protein export (1990)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1990-05-18
    Description: Most proteins destined for export from Escherichia coli are made as precursors containing amino-terminal leader sequences that are essential for export and that are removed during the process. The initial step in export of a subset of proteins, which includes maltose-binding protein, is binding of the precursor by the molecular chaperone SecB. This work shows directly that SecB binds with high affinity to unfolded maltose-binding protein but does not specifically recognize and bind the leader. Rather, the leader modulates folding to expose elements in the remainder of the polypeptide that are recognized by SecB.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Randall, L L -- Topping, T B -- Hardy, S J -- GM 29798/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 1990 May 18;248(4957):860-3.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Biochemistry/Biophysics Program, Washington State University, Pullman 99164-4660.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2188362" target="_blank"〉PubMed〈/a〉
    Keywords: *ATP-Binding Cassette Transporters ; Bacterial Proteins/*metabolism ; Binding Sites ; Biological Transport ; Carrier Proteins/*metabolism ; Cytosol/metabolism ; Escherichia coli/*metabolism ; *Escherichia coli Proteins ; Maltose-Binding Proteins ; Molecular Weight ; *Monosaccharide Transport Proteins ; Protein Conformation ; Protein Precursors/*metabolism ; Protein Sorting Signals/*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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  • 4
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    GT-1 binding site confers light responsive expression in transgenic tobacco (1990)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1990-04-27
    Description: Light-dependent expression of rbcS, the gene encoding the small subunit of ribulose-1,5-bisphosphate carboxylase, which is the key enzyme involved in carbon fixation in higher plants, is regulated at the transcriptional level. Sequence analysis of the gene has uncovered a conserved GT motif in the -150 to -100 region of many rbcS promoters. This motif serves as the binding site of a nuclear factor, designated GT-1. Analysis of site-specific mutants of pea rbcS-3A promoter demonstrated that GT-1 binding in vitro is correlated with light-responsive expression of the rbcS promoter in transgenic plants. However, it is not known whether factors other than GT-1 might also be required for activation of transcription by light. A synthetic tetramer of box II (TGTGTGGTTAATATG), the GT-1 binding site located between -152 to -138 of the rbcS-3A promoter, inserted upstream of a truncated cauliflower mosaic virus 35S promoter is sufficient to confer expression in leaves of transgenic tobacco. This expression occurs principally in chloroplast-containing cells, is induced by light, and is correlated with the ability of box II to bind GT-1 in vitro. The data show that the binding site for GT-1 is likely to be a part of the molecular light switch for rbcS activation.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Lam, E -- Chua, N H -- New York, N.Y. -- Science. 1990 Apr 27;248(4954):471-4.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Laboratory of Plant Molecular Biology, Rockefeller University, New York, NY 10021.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2330508" target="_blank"〉PubMed〈/a〉
    Keywords: Base Sequence ; Binding Sites ; Chloramphenicol O-Acetyltransferase/genetics ; Cloning, Molecular ; DNA-Binding Proteins/*metabolism ; Gene Expression Regulation/*physiology ; Genetic Vectors ; *Light ; Molecular Sequence Data ; Mutation ; Nuclear Proteins/*metabolism ; Plant Proteins/*metabolism ; *Plants, Toxic ; Promoter Regions, Genetic/genetics ; Ribulose-Bisphosphate Carboxylase/*genetics ; Tobacco/enzymology/*genetics ; Transcription, Genetic/radiation effects ; Transformation, Genetic
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  • 5
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    Common modifications of trimeric G proteins and ras protein: involvement of polyisoprenylation (1990)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1990-07-13
    Description: The heterotrimeric guanine nucleotide-binding regulatory proteins act at the inner surface of the plasma membrane to relay information from cell surface receptors to effectors inside the cell. These G proteins are not integral membrane proteins, yet are membrane associated. The processing and function of the gamma subunit of the yeast G protein involved in mating-pheromone signal transduction was found to be affected by the same mutations that block ras processing. The nature of these mutations implied that the gamma subunit was polyisoprenylated and that this modification was necessary for membrane association and biological activity. A microbial screen was developed for pharmacological agents that inhibit polyisoprenylation and that have potential application in cancer therapy.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Finegold, A A -- Schafer, W R -- Rine, J -- Whiteway, M -- Tamanoi, F -- CA 41996/CA/NCI NIH HHS/ -- GM 07183/GM/NIGMS NIH HHS/ -- GM 35827/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 1990 Jul 13;249(4965):165-9.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Biochemistry and Molecular Biology, University of Chicago, IL 60637.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/1695391" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Cell Membrane/metabolism ; Cloning, Molecular ; Epitopes/genetics ; GTP-Binding Proteins/genetics/*metabolism ; Hemagglutinins, Viral/immunology ; Lovastatin/pharmacology ; Mevalonic Acid/pharmacology ; Molecular Sequence Data ; Mutation ; Oncogene Protein p21(ras)/genetics/*metabolism ; Orthomyxoviridae/immunology ; Protein Processing, Post-Translational ; Saccharomyces cerevisiae/*genetics/metabolism ; Signal Transduction ; Suppression, Genetic
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  • 6
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    A potent GAL4 derivative activates transcription at a distance in vitro (1990)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1990-02-09
    Description: Transcription of a typical eukaryotic gene by RNA polymerase II is activated by proteins bound to sites found near the beginning of the gene as well as to sites, called enhancers, located a great distance from the gene. According to one view, the primary difference between an activator that can work at a large distance and one that cannot is that the former bears a particularly strong activating region; the stronger the activating region, the more readily the activator interacts with its target bound near the transcriptional start site, with the intervening DNA looping out to accommodate the reaction. One alternative view is that the effect of proteins bound to enhancers might require some special aspect of cellular or chromosome structure. Consistent with the first view, an activator bearing an unusually potent activating region can stimulate transcription of a mammalian gene in a HeLa nuclear extract when bound as far as 1.3 kilobase pairs upstream or 320 base pairs downstream of the transcriptional start site.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Carey, M -- Leatherwood, J -- Ptashne, M -- New York, N.Y. -- Science. 1990 Feb 9;247(4943):710-2.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Biochemistry and Molecular Biology, Harvard University, Cambridge, MA 02138.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2405489" target="_blank"〉PubMed〈/a〉
    Keywords: Activating Transcription Factors ; Binding Sites ; Blood Proteins/pharmacology ; Cloning, Molecular ; DNA/metabolism ; DNA-Binding Proteins ; Fungal Proteins/metabolism/*pharmacology ; HeLa Cells ; Phosphoproteins/pharmacology ; Promoter Regions, Genetic ; RNA Polymerase II/metabolism ; Recombinant Fusion Proteins/pharmacology ; *Saccharomyces cerevisiae Proteins ; Templates, Genetic ; Trans-Activators/pharmacology ; Transcription Factors/pharmacology ; Transcription, Genetic/*drug effects
    Print ISSN: 0036-8075
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  • 7
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    Autophosphorylation of protein kinase C at three separated regions of its primary sequence (1990)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1990-07-27
    Description: The major autophosphorylation sites of the rat beta II isozyme of protein kinase C were identified. The modified threonine and serine residues were found in the amino-terminal peptide, the carboxyl-terminal tail, and the hinge region between the regulatory lipid-binding domain and the catalytic kinase domain. Because this autophosphorylation follows an intrapeptide mechanism, extraordinary flexibility of the protein is necessary to phosphorylate the three regions. Comparison of the sequences surrounding the modified residues showed no obvious recognition motif nor any similarity to substrate phosphorylation sites, suggesting that proximity to the active site may be the primary criterion for their phosphorylation.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Flint, A J -- Paladini, R D -- Koshland, D E Jr -- DK09765/DK/NIDDK NIH HHS/ -- New York, N.Y. -- Science. 1990 Jul 27;249(4967):408-11.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Molecular and Cellular Biology, University of California, Berkeley 94720.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2377895" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Animals ; Binding Sites ; Brain/enzymology ; Cloning, Molecular ; Isoenzymes/genetics/*metabolism ; Molecular Sequence Data ; Peptide Fragments/isolation & purification/metabolism ; Phosphorylation ; Protein Conformation ; Protein Kinase C/genetics/*metabolism ; Rats ; Recombinant Proteins/metabolism ; Signal Transduction ; Trypsin
    Print ISSN: 0036-8075
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  • 8
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    The energetic basis of specificity in the Eco RI endonuclease--DNA interaction (1990)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1990-11-09
    Description: High sequence selectivity in DNA-protein interactions was analyzed by measuring discrimination by Eco RI endonuclease between the recognition site GAATTC and systematically altered DNA sites. Base analogue substitutions that preserve the sequence-dependent conformational motif of the GAATTC site permit deletion of single sites of protein-base contact at a cost of +1 to +2 kcal/mol. However, the introduction of any one incorrect natural base pair costs +6 to +13 kcal/mol in transition state interaction energy, the resultant of the following interdependent factors: deletion of one or two hydrogen bonds between the protein and a purine base; unfavourable steric apposition between a group on the protein and an incorrectly placed functional group on a base; disruption of a pyrimidine contact with the protein; loss of some crucial interactions between protein and DNA phosphates; and an increased energetic cost of attaining the required DNA conformation in the transition state complex. Eco RI endonuclease thus achieves stringent discrimination by both "direct readout" (protein-base contracts) and "indirect readout" (protein-phosphate contacts and DNA conformation) of the DNA sequence.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Lesser, D R -- Kurpiewski, M R -- Jen-Jacobson, L -- GM-29207/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 1990 Nov 9;250(4982):776-86.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Biological Sciences, University of Pittsburgh, PA 15260.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2237428" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Base Sequence ; Binding Sites ; DNA/chemistry/genetics/*metabolism ; Deoxyribonuclease EcoRI/chemistry/*metabolism ; Energy Transfer ; Molecular Sequence Data ; Nucleic Acid Conformation ; Phosphates/metabolism ; Substrate Specificity
    Print ISSN: 0036-8075
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  • 9
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    GTP-GDP exchange proteins (1990)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1990-05-18
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Levitzki, A -- New York, N.Y. -- Science. 1990 May 18;248(4957):794.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Biological Chemistry, Hebrew University of Jerusalem, Israel.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2188357" target="_blank"〉PubMed〈/a〉
    Keywords: Guanine Nucleotides/*metabolism ; Guanosine Diphosphate/*metabolism ; Guanosine Triphosphate/*metabolism ; Mutation ; Oncogene Protein p21(ras)/genetics/*metabolism ; Proto-Oncogene Proteins/genetics/*metabolism ; Proto-Oncogene Proteins p21(ras) ; Saccharomyces cerevisiae/genetics/metabolism ; Schizosaccharomyces/genetics/metabolism
    Print ISSN: 0036-8075
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  • 10
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    Design of DNA-binding peptides based on the leucine zipper motif (1990)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1990-08-17
    Description: A class of transcriptional regulator proteins bind to DNA at dyad-symmetric sites through a motif consisting of (i) a "leucine zipper" sequence that associates into noncovalent, parallel, alpha-helical dimers and (ii) a covalently connected basic region necessary for binding DNA. The basic regions are predicted to be disordered in the absence of DNA and to form alpha helices when bound to DNA. These helices bind in the major groove forming multiple hydrogen-bonded and van der Waals contacts with the nucleotide bases. To test this model, two peptides were designed that were identical to natural leucine zipper proteins only at positions hypothesized to be critical for dimerization and DNA recognition. The peptides form dimers that bind specifically to DNA with their basic regions in alpha-helical conformations.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉O'Neil, K T -- Hoess, R H -- DeGrado, W F -- New York, N.Y. -- Science. 1990 Aug 17;249(4970):774-8.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Central Research and Development Department, E.I. du Pont de Nemours & Co., Wilmington, DE 19880-0328.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2389143" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Base Sequence ; Binding Sites ; Chemistry, Physical ; Circular Dichroism ; Computer Simulation ; DNA/*metabolism ; DNA-Binding Proteins/*metabolism ; Hydrogen Bonding ; *Leucine ; Macromolecular Substances ; Models, Molecular ; Molecular Sequence Data ; Physicochemical Phenomena ; Protein Conformation
    Print ISSN: 0036-8075
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  • 11
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    DNA looping and unlooping by AraC protein (1990)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1990-10-26
    Description: Expression of the L-arabinose BAD operon in Escherichia coli is regulated by AraC protein which acts both positively in the presence of arabinose to induce transcription and negatively in the absence of arabinose to repress transcription. The repression of the araBAD promoter is mediated by DNA looping between AraC protein bound at two sites near the promoter separated by 210 base pairs, araI and araO2. In vivo and in vitro experiments presented here show that an AraC dimer, with binding to half of araI and to araO2, maintains the repressed state of the operon. The addition of arabinose, which induces the operon, breaks the loop, and shifts the interactions from the distal araO2 site to the previously unoccupied half of the araI site. The conversion between the two states does not require additional binding of AraC protein and appears to be driven largely by properties of the protein rather than being specified by the slightly different DNA sequences of the binding sites. Slight reorientation of the subunits of AraC could specify looping or unlooping by the protein. Such a mechanism could account for regulation of DNA looping in other systems.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Lobell, R B -- Schleif, R F -- GM18277/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 1990 Oct 26;250(4980):528-32.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Graduate Department of Biochemistry, Brandeis University, Waltham, MA 02254.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2237403" target="_blank"〉PubMed〈/a〉
    Keywords: AraC Transcription Factor ; Arabinose/genetics/pharmacology ; *Bacterial Proteins ; Binding Sites ; *DNA, Bacterial/genetics/metabolism ; DNA, Superhelical/metabolism ; Escherichia coli/*genetics ; Escherichia coli Proteins ; Fucose/pharmacology ; Gene Expression Regulation, Bacterial/*drug effects ; Guanine/metabolism ; Macromolecular Substances ; Methylation ; Mutation ; Nucleic Acid Conformation/*drug effects ; Operon ; Protein Conformation/drug effects ; Repressor Proteins/metabolism/*pharmacology ; *Transcription Factors
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  • 12
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    An insertion in the human thyrotropin receptor critical for high affinity hormone binding (1990)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1990-09-21
    Description: Thyrotropin (TSH), luteinizing hormone (LH), and chorionic gonadotropin (CG) are structurally related glycoprotein hormones, which bind to receptors that share a high degree of sequence similarity. However, comparison of the primary amino acid sequences of the TSH and LH-CG receptors reveals two unique insertions of 8 and 50 amino acids in the extracellular domain of the TSH receptor. The functional significance of these insertions were determined by site-directed mutagenesis. Deletion of the 50-amino acid tract (residues 317 to 366) had no effect on TSH binding or on TSH and thyroid-stimulating immunoglobulin (TSI) biological activities. In contrast, either deletion or substitution of the eight-amino acid region (residues 38 to 45) abolished these activities. This eight-amino acid tract near the amino terminus of the TSH receptor appears to be an important site of interaction for both TSH and TSI.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Wadsworth, H L -- Chazenbalk, G D -- Nagayama, Y -- Russo, D -- Rapoport, B -- DK-19289/DK/NIDDK NIH HHS/ -- DK-36182/DK/NIDDK NIH HHS/ -- New York, N.Y. -- Science. 1990 Sep 21;249(4975):1423-5.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Medicine, Veterans Administration Medical Center, San Francisco, CA 94121.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2169649" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Base Sequence ; Binding Sites ; Cell Line ; Chromosome Deletion ; Clone Cells ; Cyclic AMP/metabolism ; Humans ; Molecular Sequence Data ; Mutation ; Oligonucleotide Probes ; Receptors, Thyrotropin/*genetics/metabolism ; Thyrotropin/*metabolism/pharmacology ; Transfection
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  • 13
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    Testing for carcinogens with rodents (1990)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1990-09-21
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Abelson, P H -- New York, N.Y. -- Science. 1990 Sep 21;249(4975):1357.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2402628" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Carcinogenicity Tests/*methods ; *Carcinogens ; Mutation ; *Rodentia
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  • 14
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    Defective presentation of endogenous antigen by a cell line expressing class I molecules (1990)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1990-04-20
    Description: Cytotoxic T lymphocytes (CTLs) recognize class I major histocompatibility complex (MHC) molecules associated with antigenic peptides derived from endogenously synthesized proteins. Binding to such peptides is a requirement for class I assembly in the endoplasmic reticulum (ER). A mutant human cell line, T2, assembles and transports to its surface some, but not all, class I MHC molecules. The class I molecules expressed on the surface of T2 do not present peptides derived from cytosolic antigens, although they can present exogenously added peptides to CTL. The transported class I molecules may interact weakly with an unknown retaining factor in the ER such that they can assemble despite the relative shortage of peptides.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Hosken, N A -- Bevan, M J -- AI-19335/AI/NIAID NIH HHS/ -- New York, N.Y. -- Science. 1990 Apr 20;248(4953):367-70.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Immunology, Research Institute of Scripps Clinic, La Jolla, CA 92037.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2326647" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Antigen-Presenting Cells/*immunology ; Antigens/immunology ; Antigens, Viral/immunology ; B-Lymphocytes/immunology ; Capsid/immunology ; Cell Line ; Endoplasmic Reticulum/immunology ; Gene Expression ; H-2 Antigens/genetics/immunology ; HLA Antigens/genetics ; Histocompatibility Antigens Class I/*immunology ; Histocompatibility Antigens Class II/genetics ; Humans ; Mice ; Mutation ; Ovalbumin/immunology ; Peptides/immunology ; T-Lymphocytes, Cytotoxic/immunology ; Transfection ; Tumor Cells, Cultured ; Viral Core Proteins/immunology
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    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 15
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    Involvement of the silencer and UAS binding protein RAP1 in regulation of telomere length (1990)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1990-10-26
    Description: The yeast protein RAP1, initially described as a transcriptional regulator, binds in vitro to sequences found in a number of seemingly unrelated genomic loci. These include the silencers at the transcriptionally repressed mating-type genes, the promoters of many genes important for cell growth, and the poly[(cytosine)1-3 adenine] [poly(C1-3A)] repeats of telomeres. Because RAP1 binds in vitro to the poly(C1-3A) repeats of telomeres, it has been suggested that RAP1 may be involved in telomere function in vivo. In order to test this hypothesis, the telomere tract lengths of yeast strains that contained conditionally lethal (ts) rap1 mutations were analyzed. Several rap1ts alleles reduced telomere length in a temperature-dependent manner. In addition, plasmids that contain small, synthetic telomeres with intact or mutant RAP1 binding sites were tested for their ability to function as substrates for poly(C1-3A) addition in vivo. Mutations in the RAP1 binding sites reduced the efficiency of the addition reaction.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Lustig, A J -- Kurtz, S -- Shore, D -- GM 40094/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 1990 Oct 26;250(4980):549-53.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Molecular Biology, Memorial Sloan-Kettering Cancer Center, New York, NY 10021.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2237406" target="_blank"〉PubMed〈/a〉
    Keywords: Base Sequence ; Binding Sites ; Chromosomes, Fungal/metabolism/*ultrastructure ; DNA-Binding Proteins/metabolism ; Fungal Proteins/genetics/*metabolism ; *Genes, Fungal ; *Genes, Mating Type, Fungal ; Molecular Sequence Data ; Mutation ; Plasmids ; Poly A/metabolism ; Poly C/metabolism ; Repetitive Sequences, Nucleic Acid ; Saccharomyces cerevisiae/*genetics ; Temperature ; *Transcription Factors ; Transformation, Genetic
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  • 16
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    Three-dimensional structure of cellobiohydrolase II from Trichoderma reesei (1990)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1990-07-27
    Description: The enzymatic degradation of cellulose is an important process, both ecologically and commercially. The three-dimensional structure of a cellulase, the enzymatic core of CBHII from the fungus Trichoderma reesei reveals an alpha-beta protein with a fold similar to but different from the widely occurring barrel topology first observed in triose phosphate isomerase. The active site of CBHII is located at the carboxyl-terminal end of a parallel beta barrel, in an enclosed tunnel through which the cellulose threads. Two aspartic acid residues, located in the center of the tunnel are the probable catalytic residues.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Rouvinen, J -- Bergfors, T -- Teeri, T -- Knowles, J K -- Jones, T A -- New York, N.Y. -- Science. 1990 Jul 27;249(4967):380-6.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Molecular Biology, BMC, Uppsala, Sweden.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2377893" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Binding Sites ; Cellulose/metabolism ; Cellulose 1,4-beta-Cellobiosidase ; Chemistry, Physical ; Crystallization ; Crystallography ; *Glycoside Hydrolases/metabolism ; Glycosylation ; Hydrogen Bonding ; Hydrogen-Ion Concentration ; Mitosporic Fungi/*enzymology ; Molecular Sequence Data ; Molecular Structure ; Physicochemical Phenomena ; Protein Conformation ; Trichoderma/*enzymology
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    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 17
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    Regulation of an enzyme by phosphorylation at the active site (1990)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1990-08-31
    Description: The isocitrate dehydrogenase of Escherichia coli is an example of a ubiquitous class of enzymes that are regulated by covalent modification. In the three-dimensional structure of the enzyme-substrate complex, isocitrate forms a hydrogen bond with Ser113, the site of regulatory phosphorylation. The structures of Asp113 and Glu113 mutants, which mimic the inactivation of the enzyme by phosphorylation, show minimal conformational changes from wild type, as in the phosphorylated enzyme. Calculations based on observed structures suggest that the change in electrostatic potential when a negative charge is introduced either by phosporylation or site-directed mutagenesis is sufficient to inactivate the enzyme. Thus, direct interaction at a ligand binding site is an alternative mechanism to induced conformational changes from an allosteric site in the regulation of protein activity by phosphorylation.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Hurley, J H -- Dean, A M -- Sohl, J L -- Koshland, D E Jr -- Stroud, R M -- GM 24485/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 1990 Aug 31;249(4972):1012-6.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Biochemistry and Biophysics, University of California, San Francisco 94143-0448.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2204109" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Binding Sites ; Escherichia coli/*enzymology/genetics ; Homeostasis ; Isocitrate Dehydrogenase/genetics/*metabolism ; Models, Molecular ; Molecular Sequence Data ; Phosphorylation ; Protein Conformation
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  • 18
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    Conserved residues make similar contacts in two repressor-operator complexes (1990)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 1990-03-09
    Description: Comparison of a lambda repressor-operator complex and a 434 repressor-operator complex reveals that three conserved residues in the helix-turn-helix (HTH) region make similar contacts in each of the crystallographically determined structures. These conserved residues and their interactions with phosphodiester oxygens help establish a frame of reference within which other HTH residues make contacts that are critical for site-specific recognition. Such "positioning contacts" may be important conserved features within families of HTH proteins. In contrast, the structural comparisons appear to rule out any simple "recognition code" at the level of detailed side chain-base pair interactions.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Pabo, C O -- Aggarwal, A K -- Jordan, S R -- Beamer, L J -- Obeysekare, U R -- Harrison, S C -- GM 29109/GM/NIGMS NIH HHS/ -- GM 31471/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 1990 Mar 9;247(4947):1210-3.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Howard Hughes Medical Institute, Department of Molecular Biology and Genetics, Johns Hopkins University School of Medicine, Baltimore, MD 21205.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2315694" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Asparagine ; Base Composition ; Base Sequence ; Binding Sites ; *DNA-Binding Proteins ; Glutamine ; Hydrogen Bonding ; Molecular Sequence Data ; Molecular Structure ; *Operator Regions, Genetic ; Protein Conformation ; Repressor Proteins/*metabolism ; Transcription Factors/*metabolism ; Viral Proteins ; Viral Regulatory and Accessory Proteins
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  • 19
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    Molecular cloning and expression of a complementary DNA for inositol 1,4,5-trisphosphate 3-kinase (1990)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1990-04-06
    Description: A complementary DNA (cDNA) clone that encodes inositol 1,4,5-trisphosphate 3-kinase was isolated from a rat brain cDNA expression library with the use of monoclonal antibodies. This clone had an open reading frame that would direct the synthesis of a protein consisting of 449 amino acids and with a molecular mass of 49,853 daltons. The putative protein revealed a potential calmodulin-binding site and six regions with amino acid compositions (PEST regions) common to proteins that are susceptible to calpain. Expression of the cDNA in COS cells resulted in an approximately 150-fold increase in inositol 1,4,5-trisphosphate 3-kinase activity of these cells.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Choi, K Y -- Kim, H K -- Lee, S Y -- Moon, K H -- Sim, S S -- Kim, J W -- Chung, H K -- Rhee, S G -- New York, N.Y. -- Science. 1990 Apr 6;248(4951):64-6.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Laboratory of Biochemistry, National Heart, Lung, and Blood Institute, National Institutes of Health, Bethesda, MD 20892.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2157285" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Animals ; Binding Sites ; Brain/enzymology ; Calcium/metabolism ; Calmodulin/metabolism ; Calpain/antagonists & inhibitors/pharmacology ; Cell Line ; *Cloning, Molecular ; Codon ; DNA/*genetics ; *Gene Expression ; Molecular Sequence Data ; Molecular Weight ; Phosphotransferases/*genetics/metabolism ; *Phosphotransferases (Alcohol Group Acceptor) ; Plasmids ; Rats ; Transfection
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  • 20
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    The structure of a complex of recombinant hirudin and human alpha-thrombin (1990)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1990-07-20
    Description: The crystallographic structure of a recombinant hirudin-thrombin complex has been solved at 2.3 angstrom (A) resolution. Hirudin consists of an NH2-terminal globular domain and a long (39 A) COOH-terminal extended domain. Residues Ile1 to Tyr3 of hirudin form a parallel beta-strand with Ser214 to Glu217 of thrombin with the nitrogen atom of Ile1 making a hydrogen bond with Ser195 O gamma atom of the catalytic site, but the specificity pocket of thrombin is not involved in the interaction. The COOH-terminal segment makes numerous electrostatic interactions with an anion-binding exosite of thrombin, whereas the last five residues are in a helical loop that forms many hydrophobic contacts. In all, 27 of the 65 residues of hirudin have contacts less than 4.0 A with thrombin (10 ion pairs and 23 hydrogen bonds). Such abundant interactions may account for the high affinity and specificity of hirudin.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Rydel, T J -- Ravichandran, K G -- Tulinsky, A -- Bode, W -- Huber, R -- Roitsch, C -- Fenton, J W 2nd -- HL13160/HL/NHLBI NIH HHS/ -- HL43229/HL/NHLBI NIH HHS/ -- New York, N.Y. -- Science. 1990 Jul 20;249(4966):277-80.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Chemistry, Michigan State University, East Lansing 48824.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2374926" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Binding Sites ; Hirudins/*metabolism ; Humans ; Models, Molecular ; Molecular Sequence Data ; Protein Binding ; Protein Conformation ; Recombinant Proteins/metabolism ; Thrombin/*metabolism ; X-Ray Diffraction
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  • 21
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    Translation initiation and ribosomal biogenesis: involvement of a putative rRNA helicase and RPL46 (1990)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1990-03-02
    Description: Cold-sensitive mutations in the SPB genes (spb1-spb7) of Saccharomyces cerevisiae suppress the inhibition of translation initiation resulting from deletion of the poly(A)-binding protein gene (PAB1). The SPB4 protein belongs to a family of adenosine triphosphate (ATP)-dependent RNA helicases. The aberrant production of 25S ribosomal RNA (rRNA) occurring in spb4-1 mutants or the deletion of SPB2 (RPL46) permits the deletion of PAB1. These data suggest that mutations affecting different steps of 60S subunit formation can allow PAB-independent translation, and they indicate that further characterization of the spb mutations could lend insight into the biogenesis of the ribosome.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Sachs, A B -- Davis, R W -- R37 GM 21891/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 1990 Mar 2;247(4946):1077-9.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Biochemistry, Stanford Medical Center, CA 94305.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2408148" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Base Sequence ; Carrier Proteins/genetics/metabolism ; DEAD-box RNA Helicases ; Molecular Sequence Data ; Mutation ; Poly(A)-Binding Proteins ; *Protein Biosynthesis ; RNA Nucleotidyltransferases/genetics/*metabolism ; RNA Processing, Post-Transcriptional ; RNA, Fungal/genetics/metabolism ; RNA, Ribosomal/genetics/*metabolism ; Ribosomal Proteins/genetics/*metabolism ; Ribosomes/*metabolism ; Saccharomyces cerevisiae/enzymology/*genetics ; *Saccharomyces cerevisiae Proteins ; Sequence Homology, Nucleic Acid
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  • 22
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    A new redox cofactor in eukaryotic enzymes: 6-hydroxydopa at the active site of bovine serum amine oxidase (1990)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 1990-05-25
    Description: An active site, cofactor-containing peptide has been obtained in high yield from bovine serum amine oxidase. Sequencing of this pentapeptide indicates: Leu-Asn-X-Asp-Tyr. Analysis of the peptide by mass spectrometry, ultraviolet-visible spectroscopy, and proton nuclear magnetic resonance leads to the identification of X as 6-hydroxydopa. This result indicates that, contrary to previous proposals, pyrroloquinoline quinone is not the active site cofactor in mammalian copper amine oxidases. Although 6-hydroxydopa has been implicated in neurotoxicity, the data presented suggest that this compound has a functional role at an enzyme active site.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Janes, S M -- Mu, D -- Wemmer, D -- Smith, A J -- Kaur, S -- Maltby, D -- Burlingame, A L -- Klinman, J P -- GM 39296/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 1990 May 25;248(4958):981-7.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Chemistry, University of California, Berkeley 94720.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2111581" target="_blank"〉PubMed〈/a〉
    Keywords: *Amine Oxidase (Copper-Containing) ; Amino Acid Sequence ; Animals ; Binding Sites ; Cattle ; Copper ; Dihydroxyphenylalanine/*analogs & derivatives/metabolism ; Magnetic Resonance Spectroscopy ; Mass Spectrometry ; Molecular Sequence Data ; Oxidoreductases/metabolism ; Oxidoreductases Acting on CH-NH Group Donors/blood/*metabolism ; Peptide Fragments/analysis/chemical synthesis ; Quinones/metabolism ; Spectrophotometry, Ultraviolet
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  • 23
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    T cells responsive to myelin basic protein in patients with multiple sclerosis (1990)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 1990-02-09
    Description: Gene mutation in vivo in human T lymphocytes appears to occur preferentially in dividing cells. Individuals with multiple sclerosis (MS) are assumed to have one or more populations of diving T cells that are being stimulated by autoantigens. Mutant T cell clones from MS patients were isolated and tested for reactivity to myelin basic protein, an antigen that is thought to participate in the induction of the disease. The hypoxanthine guanine phosphoribosyltransferase (hprt) clonal assay was used to determine mutant frequency values in MS patients with chronic progressive disease. Eleven of 258 thioguanine-resistant (hprt-) T cell clones from five of the six MS patients who were tested proliferated in response to human myelin basic protein without prior in vitro exposure to this antigen. No wild-type clones from these patients, nor any hprt- or wild-type clones from three healthy individuals responded to myelin basic protein. Thus, T cell clones that react with myelin basic protein can be isolated from the peripheral blood of MS patients.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Allegretta, M -- Nicklas, J A -- Sriram, S -- Albertini, R J -- CA30688-07/CA/NCI NIH HHS/ -- NS00849/NS/NINDS NIH HHS/ -- New York, N.Y. -- Science. 1990 Feb 9;247(4943):718-21.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Genetics Laboratory, University of Vermont, Burlington 05401.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/1689076" target="_blank"〉PubMed〈/a〉
    Keywords: Adult ; Autoantigens/immunology ; Cell Division ; Clone Cells/immunology ; Female ; Humans ; Hypoxanthine Phosphoribosyltransferase/genetics ; Male ; Middle Aged ; Multiple Sclerosis/genetics/*immunology ; Mutation ; Myelin Basic Protein/*immunology ; T-Lymphocytes/drug effects/*immunology ; Thioguanine/pharmacology ; X Chromosome
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  • 24
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    A mouse model of the aniridia-Wilms tumor deletion syndrome (1990)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 1990-11-09
    Description: Deletion of chromosome 11p13 in humans produces the WAGR syndrome, consisting of aniridia (an absence or malformation of the iris), Wilms tumor (nephroblastoma), genitourinary malformations, and mental retardation. An interspecies backcross between Mus musculus/domesticus and Mus spretus was made in order to map the homologous chromosomal region in the mouse genome and to define an animal model of this syndrome. Nine evolutionarily conserved DNA clones from proximal human 11p were localized on mouse chromosome 2 near Small-eyes (Sey), a semidominant mutation that is phenotypically similar to aniridia. Analysis of Dickie's Small-eye (SeyDey), a poorly viable allele that has pleiotropic effects, revealed the deletion of three clones, f3, f8, and k13, which encompass the aniridia (AN2) and Wilms tumor susceptibility genes in man. Unlike their human counterparts, SeyDey/+ mice do not develop nephroblastomas. These findings suggest that the Small-eye defect is genetically equivalent to human aniridia, but that loss of the murine homolog of the Wilms tumor gene is not sufficient for tumor initiation. A comparison among Sey alleles suggests that the AN2 gene product is required for induction of the lens and nasal placodes.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Glaser, T -- Lane, J -- Housman, D -- 2 T32 GMO7753-11/GM/NIGMS NIH HHS/ -- GM27882/GM/NIGMS NIH HHS/ -- T32 GM007753/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 1990 Nov 9;250(4982):823-7.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Center for Cancer Research, Massachusetts Institute of Technology, Cambridge 02139.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2173141" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Aniridia/*genetics ; Blotting, Southern ; Chromosome Deletion ; Chromosome Mapping ; DNA/analysis ; *Disease Models, Animal ; Eye/embryology/pathology ; Female ; Genes, Wilms Tumor/*genetics ; Genetic Markers ; Kidney Neoplasms/*genetics ; Male ; Mice ; Mice, Inbred C3H ; Mice, Inbred C57BL ; Muridae ; Mutation ; Phenotype ; Polymorphism, Genetic ; Syndrome ; Wilms Tumor/*genetics
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  • 25
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    HSP104 required for induced thermotolerance (1990)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 1990-06-01
    Description: A heat shock protein gene, HSP104, was isolated from Saccharomyces cerevisiae and a deletion mutation was introduced into yeast cells. Mutant cells grew at the same rate as wild-type cells and died at the same rate when exposed directly to high temperatures. However, when given a mild pre-heat treatment, the mutant cells did not acquire tolerance to heat, as did wild-type cells. Transformation with the wild-type gene rescued the defect of mutant cells. The results demonstrate that a particular heat shock protein plays a critical role in cell survival at extreme temperatures.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Sanchez, Y -- Lindquist, S L -- GM 35483/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 1990 Jun 1;248(4959):1112-5.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Howard Hughes Medical Institute, Department of Molecular Genetics and Cell Biology, University of Chicago, Illinois 60637.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2188365" target="_blank"〉PubMed〈/a〉
    Keywords: Cloning, Molecular ; Fungal Proteins/biosynthesis/*genetics ; Genes, Fungal ; Heat-Shock Proteins/biosynthesis/genetics/*physiology ; *Hot Temperature ; Mutation ; Restriction Mapping ; Saccharomyces cerevisiae/genetics/growth & development/*physiology
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  • 26
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    Transmembrane protein structure: spin labeling of bacteriorhodopsin mutants (1990)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1990-06-01
    Description: Transmembrane proteins serve important biological functions, yet precise information on their secondary and tertiary structure is very limited. The boundaries and structures of membrane-embedded domains in integral membrane proteins can be determined by a method based on a combination of site-specific mutagenesis and nitroxide spin labeling. The application to one polypeptide segment in bacteriorhodopsin, a transmembrane chromoprotein that functions as a light-driven proton pump is described. Single cysteine residues were introduced at 18 consecutive positions (residues 125 to 142). Each mutant was reacted with a specific spin label and reconstituted into vesicles that were shown to be functional. The relative collision frequency of each spin label with freely diffusing oxygen and membrane-impermeant chromium oxalate was estimated with power saturation EPR (electron paramagnetic resonance) spectroscopy. The results indicate that residues 129 to 131 form a short water-exposed loop, while residues 132 to 142 are membrane-embedded. The oxygen accessibility for positions 131 to 138 varies with a periodicity of 3.6 residues, thereby providing a striking demonstration of an alpha helix. The orientation of this helical segment with respect to the remainder of the protein was determined.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Altenbach, C -- Marti, T -- Khorana, H G -- Hubbell, W L -- AI 11479/AI/NIAID NIH HHS/ -- EY05216/EY/NEI NIH HHS/ -- GM28289/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 1990 Jun 1;248(4959):1088-92.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Jules Stein Eye Institute, University of California, Los Angeles 90024-7008.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2160734" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; *Bacteriorhodopsins/genetics ; Cysteine/genetics ; Electron Spin Resonance Spectroscopy ; *Membrane Proteins/genetics ; Molecular Sequence Data ; Mutation ; Oxalates ; Oxalic Acid ; Oxygen ; Protein Conformation ; Spin Labels
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    Paleoanthropology gets physical (1990)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1990-02-16
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Marshall, E -- New York, N.Y. -- Science. 1990 Feb 16;247(4944):798-801.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2369435" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; *Anthropology ; Carbon Radioisotopes ; DNA, Mitochondrial/genetics ; Hominidae/*genetics ; Humans ; Israel ; Mutation ; *Paleontology ; South Africa
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    Ligand-induced transformation by a noninternalizing epidermal growth factor receptor (1990)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 1990-02-23
    Description: Identification of a mutant epidermal growth factor (EGF) receptor that does not undergo downregulation has provided a genetic probe to investigate the role of internalization in ligand-induced mitogenesis. Contact-inhibited cells expressing this internalization-defective receptor exhibited a normal mitogenic response at significantly lower ligand concentrations than did cells expressing wild-type receptors. A transformed phenotype and anchorage-independent growth were observed at ligand concentrations that failed to elicit these responses in cells expressing wild-type receptors. These findings imply that activation of the protein tyrosine kinase activity at the cell membrane is sufficient for the growth-enhancing effects of EGF. Thus, downregulation can serve as an attenuation mechanism, without which transformation ensues.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Wells, A -- Welsh, J B -- Lazar, C S -- Wiley, H S -- Gill, G N -- Rosenfeld, M G -- DDK 13149/DK/NIDDK NIH HHS/ -- DDK 18477/DK/NIDDK NIH HHS/ -- New York, N.Y. -- Science. 1990 Feb 23;247(4945):962-4.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Pathology, University of California-San Diego, La Jolla 92093.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2305263" target="_blank"〉PubMed〈/a〉
    Keywords: Cell Division ; Cell Line ; Down-Regulation ; *Endocytosis ; Enzyme Activation ; Epidermal Growth Factor/pharmacology ; Genetic Vectors ; Moloney murine leukemia virus/genetics ; Mutation ; Phenotype ; Protein-Tyrosine Kinases/metabolism ; Receptor, Epidermal Growth Factor/genetics/*metabolism ; Transfection
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    Emerging viruses, emerging threat (1990)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1990-01-19
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Culliton, B J -- New York, N.Y. -- Science. 1990 Jan 19;247(4940):279-80.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2153314" target="_blank"〉PubMed〈/a〉
    Keywords: Acquired Immunodeficiency Syndrome/transmission ; Agriculture ; Animals ; Arenaviruses, New World ; Ebolavirus ; Hiv ; Hemorrhagic Fevers, Viral/transmission ; Herpesvirus 6, Human ; Humans ; Influenza A virus/genetics ; Influenza, Human/mortality/transmission ; Mutation ; Virus Diseases/epidemiology/etiology/*transmission ; Viruses/genetics/pathogenicity
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    Zinc mediation of the binding of human growth hormone to the human prolactin receptor (1990)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1990-12-21
    Description: Human growth hormone (hGH) elicits a diverse set of biological activities including lactation that derives from binding to the prolactin (PRL) receptor. The binding affinity of hGH for the extracellular binding domain of the hPRL receptor (hPRLbp) was increased about 8000-fold by addition of 50 micromolar ZnCl2. Zinc was not required for binding of hGH to the hGH binding protein (hGHbp) or for binding of hPRL to the hPRLbp. Other divalent metal ions (Ca2+, Mg2+, Cu2+, Mn2+, and Co2+) at physiological concentrations did not support such strong binding. Scatchard analysis indicated a stoichiometry of one Zn2+ per hGH.hPRLbp complex. Mutational analysis showed that a cluster of three residues (His18, His21, and Glu174) in hGH and His188 from the hPRLbp (conserved in all PRL receptors but not GH receptors) are probable Zn2+ ligands. This polypeptide hormone.receptor "zinc sandwich" provides a molecular mechanism to explain why nonprimate GHs are not lactogenic and offers a molecular link between zinc deficiency and its association with altered functions of hGH.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Cunningham, B C -- Bass, S -- Fuh, G -- Wells, J A -- New York, N.Y. -- Science. 1990 Dec 21;250(4988):1709-12.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Protein Engineering, Genentech, Inc., South San Francisco, CA 94080.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2270485" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Base Sequence ; Binding Sites ; Chlorides/*pharmacology ; Growth Hormone/*metabolism ; Humans ; Kinetics ; Models, Molecular ; Molecular Sequence Data ; Mutagenesis, Site-Directed ; Oligonucleotide Probes ; Plasmids ; Protein Conformation ; Receptors, Prolactin/drug effects/genetics/*metabolism ; Restriction Mapping ; Zinc/metabolism/*pharmacology ; *Zinc Compounds
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    Transplanted suprachiasmatic nucleus determines circadian period (1990)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 1990-02-23
    Description: The pacemaker role of the suprachiasmatic nucleus in a mammalian circadian system was tested by neural transplantation by using a mutant strain of hamster that shows a short circadian period. Small neural grafts from the suprachiasmatic region restored circadian rhythms to arrhythmic animals whose own nucleus had been ablated. The restored rhythms always exhibited the period of the donor genotype regardless of the direction of the transplant or genotype of the host. The basic period of the overt circadian rhythm therefore is determined by cells of the suprachiasmatic region.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Ralph, M R -- Foster, R G -- Davis, F C -- Menaker, M -- HD13162/HD/NICHD NIH HHS/ -- HD18686/HD/NICHD NIH HHS/ -- MH09483/MH/NIMH NIH HHS/ -- New York, N.Y. -- Science. 1990 Feb 23;247(4945):975-8.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Biology, University of Virginia, Charlottesville 22903.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2305266" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Circadian Rhythm/genetics/*physiology ; Cricetinae ; Immunohistochemistry ; Male ; Mutation ; Nerve Tissue/*transplantation ; Neuropeptide Y/analysis ; Suprachiasmatic Nucleus/embryology/*physiology ; Vasopressins/analysis
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    Targeting the E1 replication protein to the papillomavirus origin of replication by complex formation with the E2 transactivator (1990)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1990-12-21
    Description: The mechanism by which transcription factors stimulate DNA replication in eukaryotes is unknown. Bovine papillomavirus DNA synthesis requires the products of the viral E1 gene and the transcriptional activator protein encoded by the E2 gene. Experimental data showed that the 68-kilodalton (kD) E1 protein formed a complex with the 48-kD E2 transcription factor. This complex bound specifically to the viral origin of replication, which contains multiple binding sites for E2. Repressor proteins encoded by the E2 open reading frame failed to complex with E1 suggesting that the 162-amino acid region of E2 that participates in transactivation contained critical determinants for interaction with E1. The physical association between a replication protein and a transcription factor suggests that transcriptional activator proteins may function in targeting replication initiator proteins to their respective origins of replication.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Mohr, I J -- Clark, R -- Sun, S -- Androphy, E J -- MacPherson, P -- Botchan, M R -- CA-30490/CA/NCI NIH HHS/ -- CA-42414/CA/NCI NIH HHS/ -- New York, N.Y. -- Science. 1990 Dec 21;250(4988):1694-9.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Molecular and Cell Biology, University of California, Berkely 94720.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2176744" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Binding Sites ; Bovine papillomavirus 1/*genetics ; Cell Line ; *DNA Replication ; DNA, Viral/biosynthesis/genetics ; DNA-Binding Proteins/*metabolism ; Genes, Viral ; Open Reading Frames ; Protein Binding ; Repressor Proteins/*metabolism ; Transcription Factors/*metabolism ; Viral Proteins/*metabolism
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    Sequence-specific DNA binding by a short peptide dimer (1990)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 1990-08-17
    Description: A recently described class of DNA binding proteins is characterized by the "bZIP" motif, which consists of a basic region that contacts DNA and an adjacent "leucine zipper" that mediates protein dimerization. A peptide model for the basic region of the yeast transcriptional activator GCN4 has been developed in which the leucine zipper has been replaced by a disulfide bond. The 34-residue peptide dimer, but not the reduced monomer, binds DNA with nanomolar affinity at 4 degrees C. DNA binding is sequence-specific as judged by deoxyribonuclease I footprinting. Circular dichroism spectroscopy suggests that the peptide adopts a helical structure when bound to DNA. These results demonstrate directly that the GCN4 basic region is sufficient for sequence-specific DNA binding and suggest that a major function of the GCN4 leucine zipper is simply to mediate protein dimerization. Our approach provides a strategy for the design of short sequence-specific DNA binding peptides.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Talanian, R V -- McKnight, C J -- Kim, P S -- GM13665/GM/NIGMS NIH HHS/ -- GM44162/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 1990 Aug 17;249(4970):769-71.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Whitehead Institute for Biomedical Research, Nine Cambridge Center, MA 02142.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2389142" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Base Sequence ; Binding Sites ; Circular Dichroism ; DNA/*metabolism ; DNA-Binding Proteins/*metabolism ; Deoxyribonuclease I ; Disulfides ; Fungal Proteins/*metabolism ; Leucine ; Macromolecular Substances ; Molecular Sequence Data ; Peptides/*metabolism ; Protein Conformation ; *Protein Kinases ; *Saccharomyces cerevisiae Proteins ; Transcription Factors/*metabolism
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    The MerR metalloregulatory protein binds mercuric ion as a tricoordinate, metal-bridged dimer (1990)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1990-02-23
    Description: Bacterial MerR proteins are dimeric DNA-binding proteins that mediate the Hg(II)-dependent induction of mercury resistance operons. Site-directed mutagenesis of the Bacillus sp. RC607 MerR protein reveals that three of four Cys residues per monomer are required for Hg(II) binding at the single high-affinity binding site. Inactive mutant homodimers can exchange subunits to form heterodimers active for Hg(II) binding. Studies of a heterodimer retaining only three of eight cysteine residues per dimer reveal that Cys79 in one subunit and Cys114 and Cys123 in the second subunit are necessary and sufficient for high-affinity Hg(II) binding in an asymmetric, subunit bridging coordination complex.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Helmann, J D -- Ballard, B T -- Walsh, C T -- GM20011/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 1990 Feb 23;247(4945):946-8.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Biological Chemistry and Molecular Pharmacology, Harvard Medical School, Boston, MA 02115.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2305262" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Bacillus/*analysis/genetics ; Bacterial Proteins/genetics/*metabolism ; Base Sequence ; Binding Sites ; Cations ; DNA-Binding Proteins/genetics/*metabolism ; Macromolecular Substances ; Mercury/*metabolism ; Molecular Sequence Data ; Mutation ; Structure-Activity Relationship
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    Dissociation of gp120 from HIV-1 virions induced by soluble CD4 (1990)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1990-11-23
    Description: The CD4 antigen is the high affinity cellular receptor for the human immunodeficiency virus type-1 (HIV-1). Binding of recombinant soluble CD4 (sCD4) or the purified V1 domain of sCD4 to the surface glycoprotein gp120 on virions resulted in rapid dissociation of gp120 from its complex with the transmembrane glycoprotein gp41. This may represent the initial stage in virus-cell and cell-cell fusion. Shedding of gp120 from virions induced by sCD4 may also contribute to the mechanism by which these soluble receptor molecules neutralize HIV-1.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Moore, J P -- McKeating, J A -- Weiss, R A -- Sattentau, Q J -- New York, N.Y. -- Science. 1990 Nov 23;250(4984):1139-42.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Chester Beatty Laboratories, Institute of Cancer Research, London, United Kingdom.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2251501" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Antibodies, Monoclonal/pharmacology ; Antigens, CD4/immunology/*metabolism ; Binding Sites ; Binding, Competitive ; Cell Line ; Cricetinae ; HIV Envelope Protein gp120/*metabolism ; HIV Envelope Protein gp41/metabolism ; HIV-1/*metabolism ; Virion/*metabolism
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    Down to the wire for the NF gene (1990)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1990-07-20
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Roberts, L -- New York, N.Y. -- Science. 1990 Jul 20;249(4966):236-8.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2115688" target="_blank"〉PubMed〈/a〉
    Keywords: DNA/genetics ; *Genes ; Humans ; Mutation ; Neurofibromatosis 1/*genetics ; Suppression, Genetic
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    NF's cancer connection (1990)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1990-08-17
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Roberts, L -- New York, N.Y. -- Science. 1990 Aug 17;249(4970):744.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2117777" target="_blank"〉PubMed〈/a〉
    Keywords: Binding Sites ; GTPase-Activating Proteins ; Genes, ras ; Humans ; Neurofibromatosis 1/*genetics ; Proteins/genetics ; Sequence Homology, Nucleic Acid ; ras GTPase-Activating Proteins
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    Mechanism of insect resistance to the microbial insecticide Bacillus thuringiensis (1990)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1990-01-05
    Description: Receptor binding studies show that resistance of a laboratory-selected Plodia interpunctella strain to a Bacillus thuringiensis insecticidal crystal protein (ICP) is correlated with a 50-fold reduction in affinity of the membrane receptor for this protein. The strain is sensitive to a second type of ICP that apparently recognizes a different receptor. Understanding the mechanism of resistance will provide strategies to prevent or delay resistance and hence prolong the usefulness of B. thuringiensis ICPs as environmentally safe insecticides.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Van Rie, J -- McGaughey, W H -- Johnson, D E -- Barnett, B D -- Van Mellaert, H -- New York, N.Y. -- Science. 1990 Jan 5;247(4938):72-4.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Plant Genetic Systems, Gent, Belgium.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2294593" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; *Bacillus thuringiensis ; *Bacterial Proteins/metabolism ; Bacterial Toxins/metabolism ; Binding Sites ; Cell Membrane/metabolism ; *Endotoxins ; Hemolysin Proteins ; Insecticide Resistance/*physiology ; *Lepidoptera ; Microvilli/metabolism ; *Moths ; *Pest Control, Biological ; Receptors, Drug/metabolism
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    Structural mutations of the T cell receptor zeta chain and its role in T cell activation (1990)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1990-07-13
    Description: T cell hybridomas that express zeta zeta, but not zeta eta, dimers in their T cell receptors (TCRs) produce interleukin-2 (IL-2) and undergo an inhibition of spontaneous growth when activated by antigen, antibodies to the receptor, or antibodies to Thy-1. Hybridomas without zeta and eta were reconstituted with mutated zeta chains. Cytoplasmic truncations of up to 40% of the zeta molecule reconstituted normal surface assembly of TCRs, but antigen-induced IL-2 secretion and growth inhibition were lost. In contrast, cross-linking antibodies to the TCR activated these cells. A point mutation conferred the same signaling phenotype as did the truncations and caused defective antigen-induced tyrosine kinase activation. Thus zeta allows the binding of antigen/major histocompatibility complex (MHC) to alpha beta to effect TCR signaling.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Frank, S J -- Niklinska, B B -- Orloff, D G -- Mercep, M -- Ashwell, J D -- Klausner, R D -- New York, N.Y. -- Science. 1990 Jul 13;249(4965):174-7.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Cell Biology and Metabolism Branch, National Institute of Child Health and Human Development, National Institutes of Health, Bethesda, MD 20892.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2371564" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Animals ; Cross-Linking Reagents ; Dose-Response Relationship, Immunologic ; Hybridomas ; Immunity, Cellular ; Immunoblotting ; Interleukin-2/*biosynthesis ; Ligands ; *Lymphocyte Activation ; Major Histocompatibility Complex ; Mice ; Molecular Sequence Data ; Mutation ; Peptide Fragments/genetics/*immunology ; Precipitin Tests ; Receptors, Antigen, T-Cell/genetics/*immunology ; Signal Transduction ; T-Lymphocytes/*immunology ; Transfection
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    Genetic mechanisms of tumor suppression by the human p53 gene (1990)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1990-12-14
    Description: Mutations of the gene encoding p53, a 53-kilodalton cellular protein, are found frequently in human tumor cells, suggesting a crucial role for this gene in human oncogenesis. To model the stepwise mutation or loss of both p53 alleles during tumorigenesis, a human osteosarcoma cell line, Saos-2, was used that completely lacked endogenous p53. Single copies of exogenous p53 genes were then introduced by infecting cells with recombinant retroviruses containing either point-mutated or wild-type versions of the p53 cDNA sequence. Expression of wild-type p53 suppressed the neoplastic phenotype of Saos-2 cells, whereas expression of mutated p53 conferred a limited growth advantage to cells in the absence of wild-type p53. Wild-type p53 was phenotypically dominant to mutated p53 in a two-allele configuration. These results suggest that, as with the retinoblastoma gene, mutation of both alleles of the p53 gene is essential for its role in oncogenesis.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Chen, P L -- Chen, Y M -- Bookstein, R -- Lee, W H -- CA51495/CA/NCI NIH HHS/ -- EY00278/EY/NEI NIH HHS/ -- EY05758/EY/NEI NIH HHS/ -- New York, N.Y. -- Science. 1990 Dec 14;250(4987):1576-80.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Pathology, School of Medicine, University of California, San Diego, La Jolla 92093-0612.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2274789" target="_blank"〉PubMed〈/a〉
    Keywords: Alleles ; Base Sequence ; *Cinnamates ; Cloning, Molecular ; DNA/genetics ; Drug Resistance/genetics ; Genes, p53/*genetics ; Genetic Vectors ; Humans ; Hygromycin B/analogs & derivatives ; Molecular Sequence Data ; Moloney murine leukemia virus/genetics ; Mutation ; Neomycin ; Osteosarcoma/*genetics ; Plasmids ; Transfection ; Tumor Cells, Cultured
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    Secondary structure is the major determinant for interaction of HIV rev protein with RNA (1990)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1990-02-16
    Description: A region in the human immunodeficiency virus (HIV) env message, with the potential to form a complex secondary structure (designated RRE), interacts with the rev protein (Rev). This interaction is believed to mediate export of HIV structural messenger RNAs from the nucleus to the cytoplasm. In this report the regions essential for Rev interaction with the RRE are further characterized and the functional significance of Rev-RRE interaction in vivo is examined. A single hairpin loop structure within the RRE was found to be a primary determinant for Rev binding in vitro and Rev response in vivo. Maintenance of secondary structure, rather than primary nucleotide sequence alone, appeared to be necessary for Rev-RNA interaction, which distinguishes it from the mechanism for cis-acting elements in DNA. Limited changes within the 200 nucleotides, which preserved the proper RRE conformational structure, were well tolerated for Rev binding and function. Thus, variation among the RRE elements present in the diverse HIV isolates would have little, if any, effect on Rev responsiveness.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Olsen, H S -- Nelbock, P -- Cochrane, A W -- Rosen, C A -- New York, N.Y. -- Science. 1990 Feb 16;247(4944):845-8.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Molecular Oncology and Virology, Roche Institute of Molecular Biology, Nutley, NJ 07110.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2406903" target="_blank"〉PubMed〈/a〉
    Keywords: Base Composition ; Base Sequence ; Chromosome Deletion ; Gene Products, rev/genetics/*metabolism ; Genes, rev ; HIV/*genetics/metabolism ; Molecular Sequence Data ; Mutation ; Nucleic Acid Conformation ; Plasmids ; Protein Conformation ; RNA, Messenger/*genetics/metabolism ; RNA, Viral/genetics/metabolism ; Trans-Activators/*metabolism ; rev Gene Products, Human Immunodeficiency Virus
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  • 42
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    Interfacial catalysis: the mechanism of phospholipase A2 (1990)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1990-12-14
    Description: A chemical description of the action of phospholipase A2 (PLA2) can now be inferred with confidence from three high-resolution x-ray crystal structures. The first is the structure of the PLA2 from the venom of the Chinese cobra (Naja naja atra) in a complex with a phosphonate transition-state analogue. This enzyme is typical of a large, well-studied homologous family of PLA2S. The second is a similar complex with the evolutionarily distant bee-venom PLA2. The third structure is the uninhibited PLA2 from Chinese cobra venom. Despite the different molecular architectures of the cobra and bee-venom PLA2s, the transition-state analogue interacts in a nearly identical way with the catalytic machinery of both enzymes. The disposition of the fatty-acid side chains suggests a common access route of the substrate from its position in the lipid aggregate to its productive interaction with the active site. Comparison of the cobra-venom complex with the uninhibited enzyme indicates that optimal binding and catalysis at the lipid-water interface is due to facilitated substrate diffusion from the interfacial binding surface to the catalytic site rather than an allosteric change in the enzyme's structure. However, a second bound calcium ion changes its position upon the binding of the transition-state analogue, suggesting a mechanism for augmenting the critical electrophile.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3443688/" 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/PMC3443688/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Scott, D L -- White, S P -- Otwinowski, Z -- Yuan, W -- Gelb, M H -- Sigler, P B -- GM22324/GM/NIGMS NIH HHS/ -- HL36235/HL/NHLBI NIH HHS/ -- R01 HL036235/HL/NHLBI NIH HHS/ -- New York, N.Y. -- Science. 1990 Dec 14;250(4987):1541-6.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Molecular Biophysics and Biochemistry, Yale University, New Haven, CT 06511.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2274785" target="_blank"〉PubMed〈/a〉
    Keywords: Bee Venoms/analysis ; Binding Sites ; Calcium/metabolism ; Catalysis ; Chemistry, Physical ; Cobra Venoms/analysis ; Models, Molecular ; Molecular Structure ; Organophosphonates/metabolism ; Phospholipases A/chemistry/*metabolism ; Phospholipases A2 ; Phospholipids/metabolism ; Physicochemical Phenomena ; Protein Conformation ; X-Ray Diffraction
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  • 43
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    Crystal structure of bee-venom phospholipase A2 in a complex with a transition-state analogue (1990)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1990-12-14
    Description: The 2.0 angstroms crystal structure of a complex containing bee-venom phospholipase A2 (PLA2) and a phosphonate transition-state analogue was solved by multiple isomorphous replacement. The electron-density map is sufficiently detailed to visualize the proximal sugars of the enzyme's N-linked carbohydrate and a single molecule of the transition-state analogue bound ot its active center. Although bee-venom PLA2 does not belong to the large homologous Class I/II family that encompasses most other well-studied PLA2s, there is segmental sequence similarity and conservation of many functional substructures. Comparison of the bee-venom enzyme with other phospholipase structures provides compelling evidence for a common catalytic mechanism.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Scott, D L -- Otwinowski, Z -- Gelb, M H -- Sigler, P B -- GM22324/GM/NIGMS NIH HHS/ -- HL36235/HL/NHLBI NIH HHS/ -- New York, N.Y. -- Science. 1990 Dec 14;250(4987):1563-6.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Molecular Biophysics and Biochemistry, Yale University, New Haven, CT 06511.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2274788" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Bee Venoms/*analysis ; Binding Sites ; Calcium/metabolism ; Carbohydrate Metabolism ; Catalysis ; Chemistry, Physical ; Crystallization ; Hydrogen Bonding ; Molecular Sequence Data ; Molecular Structure ; Phosphatidylethanolamines/*metabolism ; Phospholipases A/*chemistry/metabolism ; Phospholipases A2 ; Physicochemical Phenomena ; Protein Conformation
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  • 44
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    Poliovirus mutants resistant to neutralization with soluble cell receptors (1990)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1990-12-14
    Description: Poliovirus mutants resistant to neutralization with soluble cellular receptor were isolated. Replication of soluble receptor-resistant (srr) mutants was blocked by a monoclonal antibody directed against the HeLa cell receptor for poliovirus, indicating that the mutants use this receptor to enter cells. The srr mutants showed reduced binding to HeLa cells and cell membranes. However, the reduced binding phenotype did not have a major impact on viral replication, as judged by plaque size and one-step growth curves. These results suggest that the use of soluble receptors as antiviral agents could lead to the selection of neutralization-resistant mutants that are able to bind cell surface receptors, replicate, and cause disease.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Kaplan, G -- Peters, D -- Racaniello, V R -- AI20017/AI/NIAID NIH HHS/ -- New York, N.Y. -- Science. 1990 Dec 14;250(4987):1596-9.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Microbiology, College of Physicians and Surgeons of Columbia University, New York, NY 10032.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2177226" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Antibodies, Monoclonal/immunology ; Antiviral Agents ; Baculoviridae/genetics ; Cell Line ; Cell Membrane/metabolism ; Centrifugation, Density Gradient ; DNA/genetics ; Genetic Vectors ; HeLa Cells ; Humans ; Insects ; Mutation ; Neutralization Tests ; Poliovirus/genetics/*physiology ; Receptors, Virus/genetics/*physiology ; Recombinant Proteins/physiology ; Transfection ; Virus Replication
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  • 45
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    Identification of small clusters of divergent amino acids that mediate the opposing effects of ras and Krev-1 (1990)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 1990-07-13
    Description: Krev-1 is an anti-oncogene that was originally identified by its ability to induce morphologic reversion of ras-transformed cells that continue to express the ras gene. The Krev-1-encoded protein is structurally related to Ras proteins. The biological activities of a series of ras-Krev-1 chimeras were studied to test the hypothesis that Krev-1 may directly interfere with a ras function. The ras-specific and Krev-1-specific amino acids immediately surrounding residues 32 to 44, which are identical between the two proteins, determined whether the protein induced cellular transformation or suppressed ras transformation. Because this region in Ras proteins has been implicated in effector function, the results suggest that Krev-1 suppresses ras-induced transformation by interfering with interaction of Ras with its effector.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Zhang, K -- Noda, M -- Vass, W C -- Papageorge, A G -- Lowy, D R -- New York, N.Y. -- Science. 1990 Jul 13;249(4965):162-5.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Laboratory of Cellular Oncology, National Cancer Institute, Bethesda, MD 20892.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2115210" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Amino Acids/*physiology ; Animals ; Cell Transformation, Neoplastic/*genetics ; Chimera ; GTP-Binding Proteins/*genetics ; *Gene Expression Regulation, Neoplastic ; *Genes, ras ; Harvey murine sarcoma virus/genetics ; Molecular Sequence Data ; Mutation ; Restriction Mapping ; *Suppression, Genetic ; rap GTP-Binding Proteins
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  • 46
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    A T cell-specific transcriptional enhancer within the human T cell receptor delta locus (1990)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 1990-03-09
    Description: The T cell antigen receptor (TCR) delta gene is located within the TCR alpha locus. A T cell-specific transcriptional enhancer, distinct from the TCR alpha enhancer, has been identified within the J delta 3-C delta intron of the human T cell receptor delta gene. This enhancer activates transcription from the V delta 1 and V delta 3 promoters as well as from heterologous promoters. Enhancer activity has been localized to a 250-bp region that contains multiple binding sites for nuclear proteins. Thus, transcriptional control of the TCR delta and TCR alpha genes is mediated by distinct regulatory elements.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Redondo, J M -- Hata, S -- Brocklehurst, C -- Krangel, M S -- R01-GM41052/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 1990 Mar 9;247(4947):1225-9.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Division of Tumor Virology, Dana-Farber Cancer Institute, Harvard Medical School, Boston, MA 02115.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2156339" target="_blank"〉PubMed〈/a〉
    Keywords: Base Sequence ; Binding Sites ; Cell Line ; Chloramphenicol O-Acetyltransferase/genetics ; DNA Restriction Enzymes ; Deoxyribonuclease I ; Enhancer Elements, Genetic/*genetics ; Gene Rearrangement ; Gene Rearrangement, alpha-Chain T-Cell Antigen Receptor ; Humans ; Molecular Sequence Data ; Mutation ; Nuclear Proteins/metabolism ; Plasmids ; Promoter Regions, Genetic/genetics ; Receptors, Antigen, T-Cell/*genetics ; Repetitive Sequences, Nucleic Acid ; *Transcription, Genetic ; Transfection
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  • 47
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    Suppression of tumorigenicity of human prostate carcinoma cells by replacing a mutated RB gene (1990)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 1990-02-09
    Description: Introduction of a normal retinoblastoma gene (RB) into retinoblastoma cells was previously shown to suppress several aspects of their neoplastic phenotype, including tumorigenicity in nude mice, thereby directly demonstrating a cancer suppression function of RB. To explore the possibility of a similar activity in a common adult tumor, RB expression was examined in three human prostate carcinoma cell lines. One of these, DU145, contained an abnormally small protein translated from an RB messenger RNA transcript that lacked 105 nucleotides encoded by exon 21. To assess the functional consequences of this mutation, normal RB expression was restored in DU145 cells by retrovirus-mediated gene transfer. Cells that maintained stable exogenous RB expression lost their ability to form tumors in nude mice, although their growth rate in culture was apparently unaltered. These results suggest that RB inactivation can play a significant role in the genesis of a common adult neoplasm and that restoration of normal RB-encoded protein in tumors could have clinical utility.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Bookstein, R -- Shew, J Y -- Chen, P L -- Scully, P -- Lee, W H -- 5758/PHS HHS/ -- New York, N.Y. -- Science. 1990 Feb 9;247(4943):712-5.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Pathology, School of Medicine, University of California, San Diego, La Jolla 92093.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2300823" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Base Sequence ; DNA/genetics ; Gene Amplification ; Gene Expression ; Humans ; Male ; Mice ; Mice, Nude ; Molecular Sequence Data ; Mutation ; Nucleic Acid Hybridization ; Prostatic Neoplasms/*genetics/pathology ; RNA, Messenger/genetics ; Retinoblastoma/*genetics ; *Suppression, Genetic ; Transfection ; Tumor Cells, Cultured
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  • 48
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    An essential signaling role for the m3G cap in the transport of U1 snRNP to the nucleus (1990)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 1990-08-17
    Description: The major small nuclear ribonucleoprotein particles (snRNPs) U1, U2, U4 + U6, and U5 have to be transported from the cytoplasm, where they are synthesized, to the nucleus, where they splice pre-messenger RNAs. Since the free core snRNP proteins in the cytoplasm do not enter the nucleus on their own, the nuclear location signal must either reside on the snRNA or be created as a result of snRNA-protein interaction. Here the involvement by the 5'-terminal cap of snRNA molecules in the nucleo-cytoplasmic transport of UsnRNPs has been studied by microinjection of synthetic U1 RNA molecules into frog oocytes; the U1 RNA bore either the normal cap (m3G) or a chemical derivative. Antibodies in the cytoplasm against the m3G cap inhibited the nuclear uptake of U1 snRNP. U1 RNA that was uncapped or contained an unnatural ApppG cap did not enter the nucleus, even though it carried a normal complement of protein molecules. When the ribose ring of the m3G cap was oxidized with periodate, nuclear transport of U1 snRNPs was severely inhibited. Finally, microinjection of m3G cap alone (but not m7G cap) into oocytes severely inhibited the transport of U1 snRNPs to the nucleus. These data suggest that one step in the nuclear uptake of U1 snRNPs involves the m3G cap structure.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Fischer, U -- Luhrmann, R -- New York, N.Y. -- Science. 1990 Aug 17;249(4970):786-90.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Institut fur Molekularbiologie und Tumorforschung, Phillipps-Universitat Marburg, Federal Republic of Germany.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2143847" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Biological Transport ; Cell Nucleus/*metabolism ; Cytoplasm/metabolism ; Female ; Guanosine/*analogs & derivatives/physiology ; Kinetics ; Mutation ; Oocytes/*ultrastructure ; RNA Caps/*physiology ; Ribonucleoproteins/genetics/*metabolism ; Ribonucleoproteins, Small Nuclear ; Signal Transduction/*physiology ; Xenopus laevis
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  • 49
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    Cystic fibrosis pilot projects go begging (1990)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1990-11-23
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Roberts, L -- New York, N.Y. -- Science. 1990 Nov 23;250(4984):1076-7.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2251497" target="_blank"〉PubMed〈/a〉
    Keywords: Cystic Fibrosis/*genetics/prevention & control ; Financing, Government ; *Genetic Testing/standards ; Humans ; Mutation ; National Institutes of Health (U.S.) ; Research Support as Topic ; United States
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  • 50
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    Phosphorylation of the polymeric immunoglobulin receptor required for its efficient transcytosis (1990)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 1990-05-11
    Description: The endosomal compartment of polarized epithelial cells is a major crossroads for membrane traffic. Proteins entering this compartment from the cell surface are sorted for transport to one of several destinations: recycling to the original cell surface, targeting to lysosomes for degradation, or transcytosis to the opposite surface. The polymeric immunoglobulin receptor (pIgR), which is normally transcytosed from the basolateral to the apical surface, was used as a model to dissect the signals that mediate this sorting event. When exogenous receptor was expressed in Madin-Darby Canine Kidney (MDCK) cells, it was shown that phosphorylation of pIgR at the serine residue at position 664 is required for efficient transcytosis. Replacement of this serine with alanine generated a receptor that is transcytosed only slowly, and appears to be recycled. Conversely, substitution with aspartic acid (which mimics the negative charge of the phosphate group) results in rapid transcytosis. It was concluded that phosphorylation is the signal that directs the pIgR from the endosome into the transcytotic pathway.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Casanova, J E -- Breitfeld, P P -- Ross, S A -- Mostov, K E -- R01-AI-25144/AI/NIAID NIH HHS/ -- New York, N.Y. -- Science. 1990 May 11;248(4956):742-5.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Anatomy, University of California, San Francisco 94143.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2110383" target="_blank"〉PubMed〈/a〉
    Keywords: Alanine ; Animals ; Aspartic Acid ; Cell Line ; Cell Membrane/immunology/metabolism ; Endocytosis ; Immunoglobulin A/metabolism ; Kinetics ; Ligands ; Membrane Glycoproteins/metabolism ; Molecular Weight ; Mutation ; Phosphorylation ; Rats ; Receptors, Immunologic ; Secretory Component/genetics/*metabolism ; Serine
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  • 51
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    Regulation of the timing of transposable element excision during maize development (1990)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1990-06-22
    Description: The ability of transposable elements (TEs) to insert into or excise out of a genetic locus can be regulated by genetic, environmental, and developmental factors. Tissue- or organ-specific activity of TEs is a frequent and well-characterized example of spatial, developmental regulation. Regulation of the timing of TE activity during ontogeny is less well understood. To analyze timing, TE-induced variegation was quantified in the aleurone of maize kernels, a tissue composed of only a single layer of cells, and sector sizes were assigned to specific cell divisions in aleurone development. Three TE families, Mu, Spm, and Ac/Ds, were studied at two genetic loci. It was found that the frequency of transposon excision changes drastically (up to 30-fold increase or equivalent decrease) during the proliferation of the aleurone. Moreover, these changes occur at the same cell divisions in all three TE families. These results suggest that the timing of TE excision during maize development can be controlled by the host.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Levy, A A -- Walbot, V -- GM 32422/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 1990 Jun 22;248(4962):1534-7.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Biological Sciences, Stanford University, CA 94305-5020.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2163107" target="_blank"〉PubMed〈/a〉
    Keywords: Alleles ; Anthocyanins/biosynthesis/genetics ; Cell Division ; DNA Transposable Elements/*genetics ; Mutation ; Zea mays/*genetics/growth & development
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  • 52
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    CF screening delayed for awhile, perhaps forever (1990)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 1990-03-16
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Roberts, L -- New York, N.Y. -- Science. 1990 Mar 16;247(4948):1296-7.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2315698" target="_blank"〉PubMed〈/a〉
    Keywords: Cystic Fibrosis/*diagnosis/genetics ; Ethics, Medical ; Humans ; Mutation
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  • 53
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    Type 1 neurofibromatosis gene: identification of a large transcript disrupted in three NF1 patients (1990)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 1990-07-13
    Description: Von Recklinghausen neurofibromatosis (NF1) is a common autosomal dominant disorder characterized by abnormalities in multiple tissues derived from the neural crest. No reliable cellular phenotypic marker has been identified, which has hampered direct efforts to identify the gene. The chromosome location of the NF1 gene has been previously mapped genetically to 17q11.2, and data from two NF1 patients with balanced translocations in this region have further narrowed the candidate interval. The use of chromosome jumping and yeast artificial chromosome technology has now led to the identification of a large (approximately 13 kilobases) ubiquitously expressed transcript (denoted NF1LT) from this region that is definitely interrupted by one and most likely by both translocations. Previously identified candidate genes, which failed to show abnormalities in NF1 patients, are apparently located within introns of NF1LT, on the antisense strand. A new mutation patient with NF1 has been identified with a de novo 0.5-kilobase insertion in the NF1LT gene. These observations, together with the high spontaneous mutation rate of NF1 (which is consistent with a large locus), suggest that NF1LT represents the elusive NF1 gene.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Wallace, M R -- Marchuk, D A -- Andersen, L B -- Letcher, R -- Odeh, H M -- Saulino, A M -- Fountain, J W -- Brereton, A -- Nicholson, J -- Mitchell, A L -- NS23410/NS/NINDS NIH HHS/ -- New York, N.Y. -- Science. 1990 Jul 13;249(4965):181-6.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Howard Hughes Medical Institute, Ann Arbor, MI.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2134734" target="_blank"〉PubMed〈/a〉
    Keywords: Adult ; Amino Acid Sequence ; Animals ; Base Sequence ; Blotting, Northern ; Blotting, Southern ; Cell Line ; Cloning, Molecular ; DNA, Neoplasm/genetics ; Gene Expression Regulation, Neoplastic ; Humans ; Hybrid Cells ; Male ; Mice ; Molecular Sequence Data ; Mutation ; Neurofibromatosis 1/*genetics ; Protein Biosynthesis ; RNA, Neoplasm/*genetics ; Transcription, Genetic ; *Translocation, Genetic ; Tumor Cells, Cultured
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    Inhibition of factor VIIa-tissue factor coagulation activity by a hybrid protein (1990)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1990-06-25
    Description: Lipoprotein-associated coagulation inhibitor (LACI) appears to inhibit tissue factor (TF)-induced blood coagulation by forming a quaternary inhibitory complex containing factor Xa, LACI, factor VIIa, and TF. A genetically engineered hybrid protein consisting of the light chain of factor Xa and the first Kunitz-type inhibitor domain of LACI is shown to directly inhibit the activity of the factor VIIa-TF catalytic complex. Unlike inhibition of factor VIIa-TF activity by native LACI, inhibition by the hybrid protein is not dependent on factor Xa. In an assay of TF-induced coagulation, 50% TF inhibition occurs with hybrid protein at 35 nanograms per milliliter, whereas LACI at 2.5 micrograms per milliliter is required for an equivalent effect. gamma-Carboxylation of glutamic acid residues in the factor Xa light chain portion of the hybrid protein is required for inhibitory activity, indicating that the first Kunitz-type domain of LACI alone is not sufficient for inhibition of factor VIIa-TF.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Girard, T J -- MacPhail, L A -- Likert, K M -- Novotny, W F -- Miletich, J P -- Broze, G J Jr -- New York, N.Y. -- Science. 1990 Jun 15;248(4961):1421-4.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Division of Hematology/Oncology, Jewish Hospital, Washington University Medical Center, St. Louis, MO 63110.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/1972598" target="_blank"〉PubMed〈/a〉
    Keywords: 1-Carboxyglutamic Acid/metabolism ; Amino Acid Sequence ; Animals ; Binding Sites ; Calcium/metabolism ; Cell Line ; Cloning, Molecular ; Factor VII/antagonists & inhibitors/metabolism/*pharmacology ; Factor VIIa/*antagonists & inhibitors/metabolism ; Factor Xa/metabolism/*pharmacology ; Fibroblasts/metabolism ; Glutamates/metabolism ; Glutamic Acid ; Lipoproteins/metabolism/*pharmacology ; Mice ; Molecular Sequence Data ; Papillomaviridae ; Protease Inhibitors/*pharmacology ; Protein Sorting Signals ; Recombinant Fusion Proteins/*pharmacology ; Thromboplastin/antagonists & inhibitors/metabolism/*pharmacology ; Transfection
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    The other human genome (1990)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 1990-09-07
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Palca, J -- New York, N.Y. -- Science. 1990 Sep 7;249(4973):1104-5.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2204113" target="_blank"〉PubMed〈/a〉
    Keywords: DNA, Mitochondrial/*genetics ; Genetic Diseases, Inborn/*genetics ; History, 20th Century ; Humans ; Mutation
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    Complementation of the mitotic activator, p80cdc25, by a human protein-tyrosine phosphatase (1990)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1990-12-14
    Description: The onset of M phase requires the activation of the pp34 protein kinase in all eukaryotes thus far examined. In Schizosaccharomyces pombe, pp34 is phosphorylated on Tyr15, and dephosphorylation of this residue regulates the initiation of mitosis. In this study, it is shown that dephosphorylation of Tyr15 triggered activation of the pp34-cyclin complex from fission yeast, that a human protein-tyrosine phosphatase can catalyze this event both in vitro and in vivo, and that activation of fission yeast pp34 does not require threonine dephosphorylation. The complementary DNA that encoded the tyrosine phosphatase replaced the mitotic activator p80cdc25, closely associating the cdc25(+)-activating pathway with tyrosine dephosphorylation of pp34.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Gould, K L -- Moreno, S -- Tonks, N K -- Nurse, P -- New York, N.Y. -- Science. 1990 Dec 14;250(4987):1573-6.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Biochemistry, University of Oxford, United Kingdom.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/1703321" target="_blank"〉PubMed〈/a〉
    Keywords: *Cell Cycle Proteins ; Cyclins/metabolism ; Enzyme Activation ; Fungal Proteins/*metabolism ; Humans ; *Mitosis ; Mutation ; Phosphoprotein Phosphatases/genetics/*metabolism ; Phosphorylation ; Phosphotyrosine ; Protein Kinases/*metabolism ; Protein Tyrosine Phosphatases ; Schizosaccharomyces/genetics/*metabolism ; Transformation, Genetic ; Tyrosine/analogs & derivatives/metabolism ; *ras-GRF1
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    Deciphering Alzheimer's disease: the amyloid precursor protein yields new clues (1990)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 1990-06-01
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Selkoe, D J -- New York, N.Y. -- Science. 1990 Jun 1;248(4959):1058-60.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Center for Neurologic Diseases, Harvard Medical School, Brigham and Women's Hospital, Boston, MA 02115.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2111582" target="_blank"〉PubMed〈/a〉
    Keywords: Alzheimer Disease/*metabolism ; Amyloid/genetics/*metabolism/physiology ; Amyloid beta-Protein Precursor ; Animals ; Brain/metabolism ; Humans ; Molecular Structure ; Mutation ; Nerve Tissue Proteins/metabolism ; Protein Precursors/genetics/*metabolism/physiology ; Protein Processing, Post-Translational
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    Association of human papillomavirus types 16 and 18 E6 proteins with p53 (1990)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 1990-04-06
    Description: Human papillomavirus type 16 (HPV-16) is a DNA tumor virus that is associated with human anogenital cancers and encodes two transforming proteins, E6 and E7. The E7 protein has been shown to bind to the retinoblastoma tumor suppressor gene product, pRB. This study shows that the E6 protein of HPV-16 is capable of binding to the cellular p53 protein. The ability of the E6 proteins from different human papillomaviruses to form complexes with p53 was assayed and found to correlate with the in vivo clinical behavior and the in vitro transforming activity of these different papillomaviruses. The wild-type p53 protein has tumor suppressor properties and has also been found in association with large T antigen and the E1B 55-kilodalton protein in cells transformed by SV40 and by adenovirus type 5, respectively, providing further evidence that the human papillomaviruses, the adenoviruses, and SV40 may effect similar cellular pathways in transformation.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Werness, B A -- Levine, A J -- Howley, P M -- New York, N.Y. -- Science. 1990 Apr 6;248(4951):76-9.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Laboratory of Tumor Virus Biology, National Cancer Institute, Bethesda, MD 20892.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2157286" target="_blank"〉PubMed〈/a〉
    Keywords: Adenovirus Early Proteins ; Amino Acid Sequence ; Antigens, Polyomavirus Transforming/metabolism ; Base Sequence ; Cell Transformation, Neoplastic ; Cell Transformation, Viral ; Cloning, Molecular ; *DNA-Binding Proteins ; Humans ; Immunosorbent Techniques ; Molecular Sequence Data ; Mutation ; Oncogene Proteins/genetics/*metabolism ; Oncogene Proteins, Viral/genetics/*metabolism ; Papillomaviridae/*analysis ; Phosphoproteins/genetics/*metabolism ; Polymerase Chain Reaction ; Protein Binding ; Simian virus 40/immunology ; Tumor Suppressor Protein p53
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    Human brain disease recreated in mice (1990)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 1990-12-14
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Marx, J -- New York, N.Y. -- Science. 1990 Dec 14;250(4987):1509-10.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2274781" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Brain Diseases/*genetics/microbiology ; Creutzfeldt-Jakob Syndrome/*genetics/microbiology ; Gerstmann-Straussler-Scheinker Disease/*genetics/*microbiology ; Humans ; Mice ; Mice, Transgenic ; Mutation ; Prions/*genetics ; Transfection
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    A novel nucleoprotein complex at a replication origin (1990)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 1990-05-25
    Description: The viral protein p6, required for the protein-primed initiation of replication of Bacillus subtilis phage phi 29, forms a nucleoprotein complex at the viral replication origins that shows novel features. Deoxyribonuclease I and hydroxyl radical footprinting data, as well as the induction of positive supercoiling, support a model in which a DNA right-handed superhelix tightly wraps around a multimeric p6 core. The interaction occurs through the DNA minor groove. The activity of p6 not only requires the formation of the complex but also its correct positioning, indicating that the other proteins involved in the initiation of replication recognize, at a precise position, either the p6 core or the DNA conformational change induced by p6.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Serrano, M -- Salas, M -- Hermoso, J M -- 5 R01 GM 27242-10/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 1990 May 25;248(4958):1012-6.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Centro de Biologia Molecular (CSIC-UAM), Universidad Autonoma, Madrid, Spain.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2111580" target="_blank"〉PubMed〈/a〉
    Keywords: Bacillus subtilis ; Bacteriophages/*genetics ; Base Sequence ; Binding Sites ; *DNA Replication ; DNA, Superhelical/metabolism ; DNA-Binding Proteins/*ultrastructure ; Deoxyribonucleoproteins/*metabolism/ultrastructure ; Molecular Sequence Data ; Nucleic Acid Conformation ; Oligonucleotides ; Viral Proteins/metabolism/ultrastructure ; Virus Replication
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    Crystal structure of cobra-venom phospholipase A2 in a complex with a transition-state analogue (1990)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 1990-12-14
    Description: The crystal structure of a complex between a phosphonate transition-state analogue and the phospholipase A2 (PLA2) from Naja naja atra venom has been solved and refined to a resolution of 2.0 angstroms. The identical stereochemistry of the two complexes that comprise the crystal's asymmetric unit indicates both the manner in which the transition state is stabilized and how the hydrophobic fatty acyl chains of the substrate are accommodated by the enzyme during interfacial catalysis. The critical features that suggest the chemistry of binding and catalysis are the same as those seen in the crystal structure of a similar complex formed with the evolutionarily distant bee-venom PLA2.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉White, S P -- Scott, D L -- Otwinowski, Z -- Gelb, M H -- Sigler, P B -- GM22324/GM/NIGMS NIH HHS/ -- HL 36235/HL/NHLBI NIH HHS/ -- New York, N.Y. -- Science. 1990 Dec 14;250(4987):1560-3.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Molecular Biophysics and Biochemistry, Yale University, New Haven, CT 06511.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2274787" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Bee Venoms/analysis ; Binding Sites ; Calcium/metabolism ; Catalysis ; Chemistry, Physical ; Cobra Venoms/*analysis ; Crystallization ; Hydrogen Bonding ; Molecular Sequence Data ; Molecular Structure ; Phosphatidylethanolamines/*metabolism ; Phospholipases A/*chemistry/metabolism ; Phospholipases A2 ; Physicochemical Phenomena ; Protein Conformation
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    Alzheimer's pathology explored (1990)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 1990-08-31
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Marx, J -- New York, N.Y. -- Science. 1990 Aug 31;249(4972):984-6.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2118681" target="_blank"〉PubMed〈/a〉
    Keywords: Alzheimer Disease/metabolism/*pathology ; Amyloid/metabolism ; Amyloid beta-Protein Precursor ; Animals ; Disease Models, Animal ; Humans ; Mutation ; Nematoda/genetics ; Protease Inhibitors/metabolism ; Protein Precursors/metabolism
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    Calcium-induced peptide association to form an intact protein domain: 1H NMR structural evidence (1990)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 1990-07-20
    Description: The 70-residue carboxyl-terminal domain of the muscle contractile protein troponin-C contains two helix-loop-helix calcium (Ca)-binding sites that are related to each other by approximate twofold rotational symmetry. Hydrophobic residues from the helices and a short three residue beta sheet at the interface of the two sites act to stabilize the protein domain in the presence of Ca. A synthetic 34-residue peptide representing one of these sites (site III) has been synthesized and studied by H-1 nuclear magnetic resonance (NMR) spectroscopy. In solution this peptide undergoes a Ca-induced conformational change to form the helix-loop-helix Ca-binding motif. Two-dimensional nuclear Overhauser effect spectra have provided evidence for the formation of a beta sheet and interactions between several hydrophobic residues from opposing helices as found in troponin-C. It is proposed that a symmetric two-site dimer similar in tertiary structure to the carboxyl-terminal domain of troponin-C forms from the assembly of two site III peptides in the Ca-bound form.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Shaw, G S -- Hodges, R S -- Sykes, B D -- New York, N.Y. -- Science. 1990 Jul 20;249(4966):280-3.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Biochemistry, University of Alberta, Edmonton, Canada.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2374927" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Animals ; Binding Sites ; Calcium/*metabolism/pharmacology ; Hydrogen ; Magnetic Resonance Spectroscopy/methods ; Models, Molecular ; Molecular Sequence Data ; Peptides/chemical synthesis/*metabolism ; Protein Conformation ; Troponin/chemical synthesis/*metabolism ; Troponin C ; Turkeys
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    Genetic analysis of histone H4: essential role of lysines subject to reversible acetylation (1990)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 1990-02-16
    Description: The nucleosome is the fundamental unit of assembly of the chromosome and reversible modifications of the histones have been suggested to be important in many aspects of nucleosome function. The structure-function relations of the amino-terminal domain of yeast histone H4 were examined by the creation of directed point mutations. The four lysines subject to reversible acetylation were essential for histone function as the substitution of arginine or asparagine at these four positions was lethal. No single lysine residue was completely essential since arginine substitutions at each position were viable, although several of these mutants were slower in completing DNA replication. The simultaneous substitution of glutamine for the four lysine residues was viable but conferred several phenotypes including mating sterility, slow progression through the G2/M period of the division cycle, and temperature-sensitive growth, as well as a prolonged period of DNA replication. These results provide genetic proof for the roles of the H4 amino-terminal domain lysines in gene expression, replication, and nuclear division.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Megee, P C -- Morgan, B A -- Mittman, B A -- Smith, M M -- GM28920/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 1990 Feb 16;247(4944):841-5.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Microbiology, School of Medicine, University of Virginia, Charlottesville 22908.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2106160" target="_blank"〉PubMed〈/a〉
    Keywords: Acetylation ; Alleles ; Cell Cycle ; Chromosome Deletion ; Codon/genetics ; Glutamine ; Histones/*genetics/metabolism ; *Lysine ; Mutation ; Plasmids ; Protein Processing, Post-Translational ; Saccharomyces cerevisiae/cytology/*genetics
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    Engineering human prolactin to bind to the human growth hormone receptor (1990)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 1990-03-23
    Description: A strategy of iterative site-directed mutagenesis and binding analysis was used to incorporate the receptor-binding determinants from human growth hormone (hGH) into the nonbinding homolog, human prolactin (hPRL). The complementary DNA for hPRL was cloned, expressed in Escherichia coli, and mutated to introduce sequentially those substitutions from hGH that were predicted by alanine-scanning mutagenesis and other studies to be most critical for binding to the hGH receptor from human liver. After seven rounds of site-specific mutagenesis, a variant of hPRL was obtained containing eight mutations with an association constant for the hGH receptor that was increased more than 10,000-fold. This hPRL variant binds one-sixth as strongly as wild-type hGH, but shares only 26 percent overall sequence identity with hGH. These studies show the feasibility of recruiting receptor-binding properties from distantly related and functionally divergent hormones and show that a detailed functional database can be used to guide the design of a protein-protein interface in the absence of direct structural information.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Cunningham, B C -- Henner, D J -- Wells, J A -- New York, N.Y. -- Science. 1990 Mar 23;247(4949 Pt 1):1461-5.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Protein Engineering, Genentech, Inc. South San Francisco, CA 94080.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2321008" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Base Sequence ; Cloning, Molecular ; Growth Hormone/genetics ; Humans ; Molecular Sequence Data ; Mutation ; Plasmids ; Prolactin/genetics/*metabolism ; Protein Conformation ; Receptors, Somatotropin/*metabolism ; Recombinant Proteins/metabolism
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    Murine developmental control genes (1990)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 1990-07-27
    Description: Various strategies have been used to isolate genes that participate in the regulation of mouse development. Gene families that have been identified on the basis of their homology to motifs within Drosophila control genes or human transcription factor genes, namely homeobox (Hox), paired-box (Pax), and POU genes, can be compared with respect to gene organization, structure, and expression patterns. The functions of these genes can be analyzed molecularly in vitro and in vivo with the use of available mouse mutants or transgenic mice. In addition, it has been possible to generate gain- or loss-of-function mutations by random or targeted introduction of transgenes. Models derived from these studies can reveal the successive steps of developmental control on a genetic level.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Kessel, M -- Gruss, P -- New York, N.Y. -- Science. 1990 Jul 27;249(4967):374-9.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Max Planck-Institute of Biophysical Chemistry, Department of Molecular Cell Biology, Gottingen, FRG.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/1974085" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Drosophila/genetics ; *Embryonic and Fetal Development ; Gene Expression ; *Genes ; Genes, Homeobox ; Mice ; Mice, Transgenic ; Mutation
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    Mini-mouse: disruption of the pygmy locus in a transgenic insertional mutant (1990)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1990-02-23
    Description: A founder transgenic mouse harbored two different integration patterns of a transgene at the same locus, each of which gave rise to a similar autosomal recessive mutation. Mice of the mutant phenotype were of small stature but had normal levels of growth hormone. The disrupted locus was cloned, and a genetic and molecular analysis showed that the insertional mutants were allelic to a spontaneous mutant, pygmy. The mice should be a useful model for the growth hormone-resistant human dwarf syndromes and could lead to a greater understanding of the pathways involved in growth and development.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Xiang, X -- Benson, K F -- Chada, K -- GM38731/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 1990 Feb 23;247(4945):967-9.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Biochemistry, Robert Wood Johnson Medical School, University of Medicine and Dentistry of New Jersey, Piscataway 08854.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2305264" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Cloning, Molecular ; DNA/genetics ; Disease Models, Animal ; Dwarfism/*genetics ; Female ; Growth Hormone/blood ; Male ; Mice ; Mice, Mutant Strains ; Mice, Transgenic ; Mutation ; Nucleic Acid Hybridization ; Pedigree ; Restriction Mapping
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    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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    A 49-kilodalton phosphoprotein in the Drosophila photoreceptor is an arrestin homolog (1990)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1990-04-27
    Description: The gene encoding the 49-kilodalton protein that undergoes light-induced phosphorylation in the Drosophila photoreceptor has been isolated and characterized. The encoded protein has 401 amino acid residues and a molecular mass of 44,972 daltons, and it shares approximately 42 percent amino acid sequence identity with arrestin (S-antigen), which has been proposed to quench the light-induced cascade of guanosine 3',5'-monophosphate hydrolysis in vertebrate photoreceptors. Unlike the 49-kilodalton protein, however, arrestin, which appears to bind to phosphorylated rhodopsin, has not itself been reported to undergo phosphorylation. In vitro, Ca2+ was the only agent found that would stimulate the phosphorylation of the 49-kilodalton protein. The phosphorylation of this arrestin-like protein in vivo may therefore be triggered by a Ca2+ signal that is likely to be regulated by light-activated phosphoinositide-specific phospholipase C.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Yamada, T -- Takeuchi, Y -- Komori, N -- Kobayashi, H -- Sakai, Y -- Hotta, Y -- Matsumoto, H -- EY06595/EY/NEI NIH HHS/ -- New York, N.Y. -- Science. 1990 Apr 27;248(4954):483-6.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Biochemistry and Molecular Biology, University of Oklahoma Health Sciences Center, Oklahoma City 73190.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2158671" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Animals ; *Antigens ; Arrestin ; Binding Sites ; Calcium/pharmacology ; Cloning, Molecular ; Cyclic GMP/metabolism ; DNA/genetics ; Drosophila melanogaster/*genetics ; Enzyme Activation/drug effects ; *Eye Proteins ; Isoelectric Point ; Molecular Sequence Data ; Molecular Weight ; Mutation ; Phosphatidylinositol Diacylglycerol-Lyase ; *Phosphoproteins/genetics/metabolism ; Phosphoric Diester Hydrolases/metabolism ; Phosphorylation ; Photoreceptor Cells/*analysis ; Protein Biosynthesis ; Restriction Mapping ; Sequence Homology, Nucleic Acid
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    Molecular switch for signal transduction: structural differences between active and inactive forms of protooncogenic ras proteins (1990)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1990-02-23
    Description: Ras proteins participate as a molecular switch in the early steps of the signal transduction pathway that is associated with cell growth and differentiation. When the protein is in its GTP complexed form it is active in signal transduction, whereas it is inactive in its GDP complexed form. A comparison of eight three-dimensional structures of ras proteins in four different crystal lattices, five with a nonhydrolyzable GTP analog and three with GDP, reveals that the "on" and "off" states of the switch are distinguished by conformational differences that span a length of more than 40 A, and are induced by the gamma-phosphate. The most significant differences are localized in two regions: residues 30 to 38 (the switch I region) in the second loop and residues 60 to 76 (the switch II region) consisting of the fourth loop and the short alpha-helix that follows the loop. Both regions are highly exposed and form a continuous strip on the molecular surface most likely to be the recognition sites for the effector and receptor molecule(or molecules). The conformational differences also provide a structural basis for understanding the biological and biochemical changes of the proteins due to oncogenic mutations, autophosphorylation, and GTP hydrolysis, and for understanding the interactions with other proteins.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Milburn, M V -- Tong, L -- deVos, A M -- Brunger, A -- Yamaizumi, Z -- Nishimura, S -- Kim, S H -- CA45593/CA/NCI NIH HHS/ -- New York, N.Y. -- Science. 1990 Feb 23;247(4945):939-45.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Chemistry, University of California, Berkeley.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2406906" target="_blank"〉PubMed〈/a〉
    Keywords: Binding Sites ; Crystallization ; Crystallography ; Guanosine Diphosphate/metabolism ; Guanosine Triphosphate/metabolism ; Humans ; Models, Molecular ; Molecular Structure ; Protein Conformation ; Proto-Oncogene Proteins/*metabolism ; Proto-Oncogene Proteins p21(ras) ; *Signal Transduction ; Structure-Activity Relationship
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    Structure of ribonuclease H phased at 2 A resolution by MAD analysis of the selenomethionyl protein (1990)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1990-09-21
    Description: Ribonuclease H digests the RNA strand of duplex RNA.DNA hybrids into oligonucleotides. This activity is indispensable for retroviral infection and is involved in bacterial replication. The ribonuclease H from Escherichia coli is homologous with the retroviral proteins. The crystal structure of the E. coli enzyme reveals a distinctive alpha-beta tertiary fold. Analysis of the molecular model implicates a carboxyl triad in the catalytic mechanism and suggests a likely mode for the binding of RNA.DNA substrates. The structure was determined by the method of multiwavelength anomalous diffraction (MAD) with the use of synchrotron data from a crystal of the recombinant selenomethionyl protein.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Yang, W -- Hendrickson, W A -- Crouch, R J -- Satow, Y -- GM 34102/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 1990 Sep 21;249(4975):1398-405.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Biochemistry and Molecular Biophysics, Columbia University, New York, NY 10032.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2169648" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Binding Sites ; Computer Graphics ; *Endoribonucleases/genetics ; Escherichia coli/enzymology ; Models, Molecular ; Molecular Sequence Data ; Protein Conformation ; Recombinant Proteins ; Ribonuclease H ; *Selenium ; *Selenomethionine ; Sequence Homology, Nucleic Acid ; X-Ray Diffraction/methods
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    Electrostatic and steric contributions to regulation at the active site of isocitrate dehydrogenase (1990)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 1990-08-31
    Description: The isocitrate dehydrogenase of Escherichia coli is regulated by covalent modification at the active site rather than, as expected, at an allosteric site. As a means of evaluating the mechanism of regulation, the kinetics of the substrate, 2R,3S-isocitrate, and a substrate analog, 2R-malate, were compared for the native, phosphorylated, and mutant enzymes. Phosphorylation decreases activity by more than a factor of 10(6) for the true substrate, but causes minor changes in the activity of the substrate analog. The kinetic results indicate that electrostatic repulsion and steric hindrance between the phosphoryl moiety and the gamma carboxyl group of 2R,3S-isocitrate are the major causes of the inactivation, with a lesser contribution from the loss of a hydrogen bond.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Dean, A M -- Koshland, D E Jr -- New York, N.Y. -- Science. 1990 Aug 31;249(4972):1044-6.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Molecular and Cell Biology, University of California, Berkeley 94720.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2204110" target="_blank"〉PubMed〈/a〉
    Keywords: Allosteric Site ; Amino Acid Sequence ; Binding Sites ; Escherichia coli/*enzymology/genetics ; Isocitrate Dehydrogenase/genetics/*metabolism ; Models, Molecular ; Mutation ; Protein Conformation
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    Sequence-specific DNA binding by the c-Myc protein (1990)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 1990-11-23
    Description: While it has been known for some time that the c-Myc protein binds to random DNA sequences, no sequence-specific binding activity has been detected. At its carboxyl terminus, c-Myc contains a basic--helix-loop-helix (bHLH) motif, which is important for dimerization and specific DNA binding, as demonstrated for other bHLH protein family members. Of those studied, most bHLH proteins bind to sites that contain a CA- -TG consensus. In this study, the technique of selected and amplified binding-sequence (SAAB) imprinting was used to identify a DNA sequence that was recognized by c-Myc. A purified carboxyl-terminal fragment of human c-Myc that contained the bHLH domain bound in vitro in a sequence-specific manner to the sequence, CACGTG. These results suggest that some of the biological functions of Myc family proteins are accomplished by sequence-specific DNA binding that is mediated by the carboxyl-terminal region of the protein.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Blackwell, T K -- Kretzner, L -- Blackwood, E M -- Eisenman, R N -- Weintraub, H -- R01 CA20525/CA/NCI NIH HHS/ -- T32 CA09437/CA/NCI NIH HHS/ -- New York, N.Y. -- Science. 1990 Nov 23;250(4984):1149-51.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Division of Basic Sciences, Fred Hutchinson Cancer Research Center, Seattle, WA 98104.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2251503" target="_blank"〉PubMed〈/a〉
    Keywords: Base Sequence ; Binding Sites ; DNA/*metabolism ; Glutathione Transferase ; Leucine Zippers ; Macromolecular Substances ; Molecular Sequence Data ; Oligonucleotides/metabolism ; Polymerase Chain Reaction ; Protein Conformation ; Proto-Oncogene Proteins c-myc/*metabolism ; Recombinant Fusion Proteins/metabolism ; Templates, Genetic
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    Differences and similarities in DNA-binding preferences of MyoD and E2A protein complexes revealed by binding site selection (1990)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1990-11-23
    Description: A technique was developed for studying protein-DNA recognition that can be applied to any purified protein, partially purified protein, or cloned gene. From oligonucleotides in which particular positions are of random sequence, that subset to which a given protein binds is amplified by the polymerase chain reaction and sequenced as a pool. These selected and amplified binding site (SAAB) "imprints" provide a characteristic set of preferred sequences for protein binding. With this technique, it was shown that homo- and heterooligomers of the helix-loop-helix proteins MyoD and E2A recognize a common consensus sequence, CA--TG, but otherwise bind to flanking and internal positions with different sequence preferences that suggest half-site recognition. These findings suggest that different combinations of dimeric proteins can have different binding sequence preferences.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Blackwell, T K -- Weintraub, H -- New York, N.Y. -- Science. 1990 Nov 23;250(4984):1104-10.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Genetics, Fred Hutchinson Cancer Research Center, Seattle, WA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2174572" target="_blank"〉PubMed〈/a〉
    Keywords: Base Sequence ; Binding Sites ; DNA/*metabolism ; DNA-Binding Proteins/*metabolism ; Glutathione Transferase ; Macromolecular Substances ; Molecular Sequence Data ; Muscle Proteins/*metabolism ; MyoD Protein ; Oligonucleotides/metabolism ; Polymerase Chain Reaction ; Protein Conformation ; Recombinant Fusion Proteins/metabolism ; Repetitive Sequences, Nucleic Acid ; TCF Transcription Factors ; Templates, Genetic ; Transcription Factor 7-Like 1 Protein ; *Transcription Factors
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    An E. coli ribonucleoprotein containing 4.5S RNA resembles mammalian signal recognition particle (1990)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1990-11-23
    Description: The signal recognition particle (SRP) plays a central role in directing the export of nascent proteins from the cytoplasm of mammalian cells. An SRP-dependent translocation machinery in bacteria has not been demonstrated in previous genetic and biochemical studies. Sequence comparisons, however, have identified (i) a gene in Escherichia coli (ffh) whose product is homologous to the 54-kilodalton subunit (SRP54) of SRP, and (ii) an RNA encoded by the ffs gene (4.5S RNA) that shares a conserved domain with the 7SL RNA of SRP. An antiserum to Ffh precipitated 4.5S RNA from E. coli extracts, implying that the two molecules reside in a complex. The 4.5S RNA can also bind to SRP54 and can replace 7SL RNA in an enzymatic assay. The product of a dominant mutation in the ffs gene (4.5S RNAdl1) is also coprecipitated by the antiserum to Ffh protein and is lethal when expressed from an inducible promoter. After induction of 4.5S RNAdl1, the earliest observed phenotype was a permanent induction of the heat shock response, suggesting that there was an accumulation of aberrant proteins in the cytoplasm. Late after induction, translocation of beta-lactamase was impaired; this may be an indirect effect of heat shock, however, because translocation of ribose binding protein or of the porin, OmpA, was unaffected. An unusual separation of the inner and outer membranes, suggestive of a defect in cell envelope, was also observed. Protein synthesis did not cease until very late, an indication that 4.5S RNA probably does not have a direct role in this process.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Poritz, M A -- Bernstein, H D -- Strub, K -- Zopf, D -- Wilhelm, H -- Walter, P -- New York, N.Y. -- Science. 1990 Nov 23;250(4984):1111-7.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Biochemistry and Biophysics, University of California Medical School, San Francisco 94143-0448.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/1701272" target="_blank"〉PubMed〈/a〉
    Keywords: Bacterial Proteins/metabolism ; Base Sequence ; Enzyme Activation ; Escherichia coli/*genetics ; GTP Phosphohydrolases/metabolism ; Genes, Bacterial ; Heat-Shock Proteins/biosynthesis ; Hot Temperature ; Immunosorbent Techniques ; Isopropyl Thiogalactoside/pharmacology ; Molecular Sequence Data ; Mutation ; Protein Sorting Signals/metabolism ; RNA, Bacterial/*genetics/metabolism ; Recombinant Fusion Proteins/metabolism ; Ribonucleoproteins/*genetics/metabolism ; Sequence Homology, Nucleic Acid ; Signal Recognition Particle
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    MHC-linked protection from diabetes dissociated from clonal deletion of T cells (1990)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1990-07-20
    Description: The I-E molecule of the major histocompatibility complex (MHC) can prevent the spontaneous development of diabetes in nonobese diabetic (NOD) mice. The mechanism of this protection has been investigated by breeding wild-type and promoter-mutated E kappa alpha transgenes onto the NOD genetic background. Animals carrying the various mutated transgenes expressed I-E on different subsets of immunocompetent cells, and thus cells important for the I-E protective effect could be identified. Although the wild-type transgene prevented the infiltration of lymphocytes into pancreatic islets, none of the mutants did. However, all of the transgenes could mediate the intrathymic elimination of T cells bearing antigen receptors with variable regions that recognize I-E. Thus, the I-E molecule does not protect NOD mice from diabetes simply by inducing the deletion of self-reactive T cells.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Bohme, J -- Schuhbaur, B -- Kanagawa, O -- Benoist, C -- Mathis, D -- New York, N.Y. -- Science. 1990 Jul 20;249(4966):293-5.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Laboratoire de Genetique Moleculaire des Eucaryotes du CNRS, Faculte de Medecine, Strasbourg, France.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2115690" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Clone Cells ; Crosses, Genetic ; Diabetes Mellitus, Experimental/*immunology/prevention & control ; Genes, MHC Class II ; Histocompatibility Antigens Class II/genetics/*immunology ; Islets of Langerhans/immunology ; *Major Histocompatibility Complex ; Mice ; Mice, Mutant Strains ; Mice, Transgenic ; Mutation ; Promoter Regions, Genetic ; Receptors, Antigen, T-Cell/genetics ; T-Lymphocytes/*immunology ; Thymus Gland/immunology
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    Activation of ras oncogenes preceding the onset of neoplasia (1990)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 1990-06-01
    Description: The identification of ras oncogenes in human and animal cancers including precancerous lesions indicates that these genes participate in the early stages of neoplastic development. Yet, these observations do not define the timing of ras oncogene activation in the multistep process of carcinogenesis. To ascertain the timing of ras oncogene activation, an animal model system was devised that involves the induction of mammary carcinomas in rats exposed at birth to the carcinogen nitrosomethylurea. High-resolution restriction fragment length polymorphism analysis of polymerase chain reaction-amplified ras sequences revealed the presence of both H-ras and K-ras oncogenes in normal mammary glands 2 weeks after carcinogen treatment and at least 2 months before the onset of neoplasia. These ras oncogenes can remain latent within the mammary gland until exposure to estrogens, demonstrating that activation of ras oncogenes can precede the onset of neoplasia and suggesting that normal physiological proliferative processes such as estrogen-induced mammary gland development may lead to neoplasia if the targeted cells harbor latent ras oncogenes.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Kumar, R -- Sukumar, S -- Barbacid, M -- 1-RO1-CA48943/CA/NCI NIH HHS/ -- N01-CO-74101/CO/NCI NIH HHS/ -- New York, N.Y. -- Science. 1990 Jun 1;248(4959):1101-4.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Molecular Biology, Squibb Institute for Medical Research, Princeton, NJ 08543.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2188364" target="_blank"〉PubMed〈/a〉
    Keywords: Adenofibroma/genetics ; Animals ; Animals, Newborn ; Base Sequence ; Carcinoma/genetics ; Cell Transformation, Neoplastic/*genetics ; Estrogens/physiology ; Female ; Gene Expression Regulation, Neoplastic/*physiology ; Genes, ras/*physiology ; Mammary Glands, Animal/growth & development ; Mammary Neoplasms, Experimental/chemically induced/*genetics ; Methylnitrosourea ; Molecular Sequence Data ; Mutation ; Polymerase Chain Reaction ; Rats ; Rats, Inbred Strains ; Sexual Maturation ; Time Factors
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    Binding of the Wilms' tumor locus zinc finger protein to the EGR-1 consensus sequence (1990)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1990-11-30
    Description: The Wilms' tumor locus (WTL) at 11p13 contains a gene that encodes a zinc finger-containing protein that has characteristics of a DNA-binding protein. However, binding of this protein to DNA in a sequence-specific manner has not been demonstrated. A synthetic gene was constructed that contained the zinc finger region, and the protein was expressed in Escherichia coli. The recombinant protein was used to identify a specific DNA binding site from a pool of degenerate oligonucleotides. The binding sites obtained were similar to the sequence recognized by the early growth response-1 (EGR-1) gene product, a zinc finger-containing protein that is induced by mitogenic stimuli. A mutation in the zinc finger region of the protein originally identified in a Wilms' tumor patient abolished its DNA-binding activity. These results suggest that the WTL protein may act at the DNA binding site of a growth factor-inducible gene and that loss of DNA-binding activity contributes to the tumorigenic process.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Rauscher, F J 3rd -- Morris, J F -- Tournay, O E -- Cook, D M -- Curran, T -- CA0917-15/CA/NCI NIH HHS/ -- CA10817/CA/NCI NIH HHS/ -- CA23413/CA/NCI NIH HHS/ -- New York, N.Y. -- Science. 1990 Nov 30;250(4985):1259-62.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Wistar Institute, Philadelphia, PA 19104.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2244209" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Base Sequence ; Binding Sites ; Binding, Competitive ; Chromosomes, Human, Pair 11 ; Consensus Sequence ; DNA/genetics/*metabolism ; DNA-Binding Proteins/genetics/*metabolism ; Early Growth Response Protein 1 ; Escherichia coli/genetics ; *Genes, Wilms Tumor ; Humans ; *Immediate-Early Proteins ; Molecular Sequence Data ; Mutation ; Oligonucleotides/metabolism ; Polymerase Chain Reaction ; Recombinant Proteins/metabolism ; Restriction Mapping ; Transcription Factors/genetics/*metabolism ; *Zinc Fingers/genetics
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    Design, activity, and 2.8 A crystal structure of a C2 symmetric inhibitor complexed to HIV-1 protease (1990)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 1990-08-03
    Description: A two-fold (C2) symmetric inhibitor of the protease of human immunodeficiency virus type-1 (HIV-1) has been designed on the basis of the three-dimensional symmetry of the enzyme active site. The symmetric molecule inhibited both protease activity and acute HIV-1 infection in vitro, was at least 10,000-fold more potent against HIV-1 protease than against related enzymes, and appeared to be stable to degradative enzymes. The 2.8 angstrom crystal structure of the inhibitor-enzyme complex demonstrated that the inhibitor binds to the enzyme in a highly symmetric fashion.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Erickson, J -- Neidhart, D J -- VanDrie, J -- Kempf, D J -- Wang, X C -- Norbeck, D W -- Plattner, J J -- Rittenhouse, J W -- Turon, M -- Wideburg, N -- AI 27220/AI/NIAID NIH HHS/ -- New York, N.Y. -- Science. 1990 Aug 3;249(4968):527-33.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Computer-Assisted Molecular Design, Abbott Laboratories, Abbott Park, IL 60064.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2200122" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Binding Sites ; Drug Design ; Endopeptidases/*metabolism ; Gene Products, pol/*metabolism ; HIV Protease ; HIV-1/*enzymology ; Kinetics ; Models, Molecular ; Molecular Sequence Data ; Protease Inhibitors/*pharmacology ; Protein Conformation ; Sugar Alcohols/*pharmacology ; Valine/*analogs & derivatives/pharmacology
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    Two domains of yeast U6 small nuclear RNA required for both steps of nuclear precursor messenger RNA splicing (1990)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1990-10-19
    Description: U6 is one of the five small nuclear RNA's (snRNA's) that are required for splicing of nuclear precursor messenger RNA (pre-mRNA). The size and sequence of U6 RNA are conserved among organisms as diverse as yeast and man, and so it has been proposed that U6 RNA functions as a catalytic element in splicing. A procedure for in vitro reconstitution of functional yeast U6 small nuclear ribonucleoproteins (snRNP's) with synthetic U6 RNA was applied in an attempt to elucidate the function of yeast U6 RNA. Two domains in U6 RNA were identified, each of which is required for in vitro splicing. Single nucleotide substitutions in these two domains block splicing either at the first or the second step. Invariably, U6 RNA mutants that block the first step of splicing do not enter the spliceosome. On the other hand, those that block the second step of splicing form a spliceosome but block cleavage at the 3' splice site of the intron. In both domains, the positions of base changes that block the second step of splicing correspond exactly to the site of insertion of pre-mRNA-type introns into the U6 gene of two yeast species, providing a possible explanation for the mechanism of how these introns originated and adding further evidence for the proposed catalytic role of U6 RNA.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Fabrizio, P -- Abelson, J -- GM 32637/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 1990 Oct 19;250(4979):404-9.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉California Institute of Technology, Division of Biology, Pasadena 91125.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2145630" target="_blank"〉PubMed〈/a〉
    Keywords: Base Sequence ; Cell Nucleus/*metabolism ; Introns ; Models, Molecular ; Molecular Sequence Data ; Mutation ; Nucleic Acid Conformation ; RNA Precursors/*genetics ; *RNA Splicing ; RNA, Small Nuclear/*genetics/metabolism ; Ribonucleoproteins/metabolism ; Ribonucleoproteins, Small Nuclear ; Saccharomyces cerevisiae/genetics ; Schizosaccharomyces/*genetics
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    Organization of the human and mouse low-affinity Fc gamma R genes: duplication and recombination (1990)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1990-05-11
    Description: Receptors for immunoglobulin G immune complexes (Fc gamma RII and Fc gamma RIII) are expressed on most hematopoietic cells and show much structural and functional diversity. In order to determine the genetic basis for this diversity, a family of genes encoding the human and mouse receptors was isolated and characterized. Humans have five distinct genes for low-affinity Fc gamma Rs, in contrast to two in the mouse. With the use of yeast artificial chromosomes, the genes encoding the human receptors were oriented and linked, which established the structure of this complex locus. Comparison of the human and mouse genes generated a model for the evolutionary amplification of this locus.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Qiu, W Q -- de Bruin, D -- Brownstein, B H -- Pearse, R -- Ravetch, J V -- GM 36306/GM/NIGMS NIH HHS/ -- GM 39256/GM/NIGMS NIH HHS/ -- K23 AG022476/AG/NIA NIH HHS/ -- R01 AG031171/AG/NIA NIH HHS/ -- New York, N.Y. -- Science. 1990 May 11;248(4956):732-5.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Division of Molecular Biology, Sloan-Kettering Institute, New York, NY 10021.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2139735" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Antigens, Differentiation/*genetics/metabolism ; Base Sequence ; Blotting, Southern ; Exons ; Genome, Human ; Humans ; Immunoglobulin G/metabolism ; Introns ; Mice ; Molecular Sequence Data ; *Multigene Family ; Mutation ; Receptors, Fc/*genetics/metabolism ; Receptors, IgG ; Recombination, Genetic ; Restriction Mapping ; Spleen/immunology
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  • 81
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    Two distinct transcription factors that bind the immunoglobulin enhancer microE5/kappa 2 motif (1990)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1990-01-26
    Description: Activity of the immunoglobulin heavy and kappa light chain gene enhancers depends on a complex interplay of ubiquitous and developmentally regulated proteins. Two complementary DNAs were isolated that encode proteins, denoted ITF-1 and ITF-2, that are expressed in a variety of cell types and bind the microE5/kappa 2 motif found in both heavy and kappa light chain enhancers. The complementary DNAs are the products of distinct genes, yet both ITF-1 and ITF-2 are structurally and functionally similar. The two proteins interact with one another through their putative helix-loop-helix motifs and each possesses a distinct domain that dictates transcription activation.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Henthorn, P -- Kiledjian, M -- Kadesch, T -- New York, N.Y. -- Science. 1990 Jan 26;247(4941):467-70.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Howard Hughes Medical Institute, Philadelphia, PA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2105528" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; B-Lymphocytes/metabolism ; Base Sequence ; Binding Sites ; Cell Line ; Cloning, Molecular ; DNA/genetics/*metabolism ; *Enhancer Elements, Genetic ; *Genes, Immunoglobulin ; Humans ; Immunoglobulin kappa-Chains/genetics ; Immunoglobulin mu-Chains/genetics ; Macromolecular Substances ; Mice ; Molecular Sequence Data ; Plasmids ; Protein Conformation ; Saccharomyces cerevisiae/genetics ; Transcription Factors/*metabolism ; Transcription, Genetic ; Transfection ; Transformation, Genetic
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  • 82
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    Acetylcholine binding by a synthetic receptor: implications for biological recognition (1990)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 1990-12-14
    Description: The neurotransmitter acetylcholine (ACh) is bound with 50-micromolar affinity by a completely synthetic receptor (host) comprising primarily aromatic rings. The host provided an overall hydrophobic binding site, but one that could recognize the positive charge of the quaternary ammonium group of ACh through a stabilizing interaction with the electron-rich pi systems of the aromatic rings (cation-pi interaction). Similar interactions may be involved in biological recognition of ACh and other choline derivatives.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Dougherty, D A -- Stauffer, D A -- GM36356/GM/NIGMS NIH HHS/ -- GM43936/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 1990 Dec 14;250(4987):1558-60.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Arnold and Mabel Beckman Laboratories of Chemical Synthesis, California Institute of Technology, Pasadena 91125.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2274786" target="_blank"〉PubMed〈/a〉
    Keywords: Acetylcholine/*metabolism ; Affinity Labels ; Amino Acid Sequence ; Animals ; Binding Sites ; Cations ; Drosophila ; Electrochemistry ; Immunoglobulin Fab Fragments/metabolism ; *Models, Molecular ; Molecular Sequence Data ; Molecular Structure ; Phosphorylcholine/metabolism ; Quaternary Ammonium Compounds/*metabolism ; Receptors, Cholinergic/chemistry/*metabolism ; Thermodynamics ; Torpedo
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  • 83
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    Structural motif of the GCN4 DNA binding domain characterized by affinity cleaving (1990)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 1990-05-18
    Description: The NH2-terminal locations of a dimer containing the DNA binding domain of the yeast transcriptional activator GCN4 have been mapped on the binding sites 5'-CTGACTAAT-3' and 5'-ATGACTCTT-3'. Affinity cleaving was effected by synthetic GCN4 proteins with Fe.EDTA moieties at the NH2-terminus. Analysis of the DNA cleavage patterns for dimers of the Fe.EDTA-proteins corresponding to GCN4 residues 222 to 281 and 226 to 281 revealed that the NH2-termini were in the major groove nine to ten base pairs apart and were symmetrically displaced four to five base pairs from the central C of the recognition site. This result is consistent with the Y-shaped scissor grip-leucine zipper model recently proposed for a class of DNA binding proteins important in the regulation of gene expression.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Oakley, M G -- Dervan, P B -- New York, N.Y. -- Science. 1990 May 18;248(4957):847-50.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena 91125.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2111578" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Base Sequence ; Binding Sites ; DNA/*metabolism ; *DNA-Binding Proteins ; Edetic Acid/metabolism ; Ferric Compounds/metabolism ; Fungal Proteins/*metabolism ; Leucine ; Macromolecular Substances ; Molecular Sequence Data ; Molecular Structure ; *Protein Kinases ; *Saccharomyces cerevisiae Proteins ; Transcription Factors/*metabolism
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  • 84
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    Derepression of ferritin messenger RNA translation by hemin in vitro (1990)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 1990-01-05
    Description: Incubation of a 90-kilodalton ferritin repressor protein (FRP), either free or complexed with an L-ferritin transcript, with hemin or Co3+-protoporphyrin IX prevented subsequent repression of ferritin synthesis in a wheat germ extract. Neither FeCl3 in combinations with H2O2, nor Fe3+ or Fe2+ chelated with EDTA, nor Zn2+-protoporphyrin IX, nor protoporphyrin IX caused significant inactivation of FRP. FRP that had been inactivated by hemin remained chemically intact, as revealed by SDS-polyacrylamide gel electrophoresis. Inclusion of chelators of iron or free radical scavengers did not alter the inactivation produced by hemin. These and other results indicate that hemin derepresses ferritin synthesis in vitro.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Lin, J J -- Daniels-McQueen, S -- Patino, M M -- Gaffield, L -- Walden, W E -- Thach, R E -- AI 20484/AI/NIAID NIH HHS/ -- RR 5369/RR/NCRR NIH HHS/ -- New York, N.Y. -- Science. 1990 Jan 5;247(4938):74-7.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Biology, Washington University, St. Louis, MO 63130.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2294594" target="_blank"〉PubMed〈/a〉
    Keywords: Binding Sites ; Binding, Competitive ; Electrophoresis, Polyacrylamide Gel ; Ferritins/biosynthesis/*genetics ; Free Radicals ; Heme/*analogs & derivatives ; Hemin/*pharmacology ; Iron Chelating Agents/pharmacology ; Protein Biosynthesis/*drug effects ; Protoporphyrins/metabolism ; RNA, Messenger/*genetics ; Repressor Proteins/*genetics/metabolism ; Transcription Factors/*genetics
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  • 85
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    Partial symmetrization of the photosynthetic reaction center (1990)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 1990-06-15
    Description: The bacterial photosynthetic reaction center (RC) is a pigmented intrinsic membrane protein that performs the primary charge separation event of photosynthesis, thereby converting light to chemical energy. The RC pigments are bound primarily by two homologous peptides, the L and M subunits, each containing five transmembrane helices. These alpha helices and pigments are arranged in an approximate C2 symmetry and form two possible electron transfer pathways. Only one of these pathways is actually used. In an attempt to identify nonhomologous residues that are responsible for functional differences between the two branches, homologous helical regions that interact extensively with the pigments were genetically symmetrized (that is, exchanged). For example, replacement of the fourth transmembrane helix (D helix) in the M subunit with the homologous helix from the L subunit yields photosynthetically inactive RCs lacking a critical photoactive pigment. Photosynthetic revertants have been isolated in which single amino acid substitutions (intragenic suppressors) compensate for this partial symmetrization.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Robles, S J -- Breton, J -- Youvan, D C -- RIGM42645A/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 1990 Jun 15;248(4961):1402-5.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Graduate Program in Applied Biological Sciences, Massachusetts Institute of Technology, Cambridge 02139.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2192455" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; *Bacterial Proteins/genetics ; Cloning, Molecular ; Electron Transport ; Macromolecular Substances ; Molecular Sequence Data ; Molecular Structure ; Mutation ; Photosynthesis ; Photosynthetic Reaction Center Complex Proteins ; Protein Conformation ; Rhodopseudomonas/analysis/genetics/growth & development ; Spectrophotometry
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  • 86
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    A new member of the leucine zipper class of proteins that binds to the HLA DR alpha promoter (1990)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1990-03-30
    Description: Several mutants derived from transformed human B cell lines are defective in expressing major histocompatibility complex (MHC) class II genes. The failure to express a class II gene in at least one such mutant line has been mapped to the MHC class II X box, a conserved transcriptional element in the promoter region. A complementary DNA encoding a DNA-binding protein (human X box binding protein, hXBP-1) whose target is the human DR alpha X box and the 3' flanking region has now been cloned. This complementary DNA encoded a protein with structural similarities to the c-jun proto-oncogene product, and its target sequence was closely related to the palindromic target sequence of c-jun. Mutation of the hXBP-1 DNA target sequence decreased DR alpha promoter activity in vivo. These studies suggest that the hXBP-1 protein acts as a transcription factor in B cells.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Liou, H C -- Boothby, M R -- Finn, P W -- Davidon, R -- Nabavi, N -- Zeleznik-Le, N J -- Ting, J P -- Glimcher, L H -- CA42771-01/CA/NCI NIH HHS/ -- GM36864/GM/NIGMS NIH HHS/ -- R01-CA48185/CA/NCI NIH HHS/ -- etc. -- New York, N.Y. -- Science. 1990 Mar 30;247(4950):1581-4.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Cancer Biology, Harvard School of Public Health, Boston, MA 02115.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2321018" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; B-Lymphocytes ; Base Sequence ; Binding Sites ; Cell Line, Transformed ; DNA/*genetics ; DNA-Binding Proteins/*genetics/metabolism ; HLA-DR Antigens/*genetics/metabolism ; Humans ; Leucine ; Molecular Sequence Data ; Mutation ; *Promoter Regions, Genetic ; Transcription Factors/*genetics/metabolism ; Transfection
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  • 87
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    A beta 3 integrin mutation abolishes ligand binding and alters divalent cation-dependent conformation (1990)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 1990-08-24
    Description: The ligand-binding function of integrin adhesion receptors depends on divalent cations. A mutant alpha IIb beta 3 integrin (platelet gpIIb/IIIa) that lacks ligand recognition shows immunologic evidence of a perturbed interaction with divalent cations. This was found to be caused by a G----T mutation that resulted in an Asp119----Tyr119 substitution in the beta 3 subunit. This residue is proximal to bound ligand and is in a conserved region among integrins that are enriched in oxygenated residues. The spacing of these residues aligns with the calcium-binding residues in EF hand proteins, suggesting interaction with receptor-bound divalent cation as a mechanism of ligand binding common to all integrins.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Loftus, J C -- O'Toole, T E -- Plow, E F -- Glass, A -- Frelinger, A L 3rd -- Ginsberg, M H -- AR 27214/AR/NIAMS NIH HHS/ -- HL 28235/HL/NHLBI NIH HHS/ -- HL 42977/HL/NHLBI NIH HHS/ -- etc. -- New York, N.Y. -- Science. 1990 Aug 24;249(4971):915-8.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Committee on Vascular Biology, Research Institute of Scripps Clinic, La Jolla, CA 92037.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2392682" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Animals ; Aspartic Acid ; Base Sequence ; Binding Sites ; Cell Line ; Integrins/*genetics/metabolism ; Ligands ; Macromolecular Substances ; Molecular Sequence Data ; *Mutation ; Oligonucleotide Probes ; Platelet Membrane Glycoproteins/*genetics/metabolism ; Polymerase Chain Reaction ; Protein Conformation ; Sequence Homology, Nucleic Acid ; Tyrosine
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  • 88
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    Inhibition of FKBP rotamase activity by immunosuppressant FK506: twisted amide surrogate (1990)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 1990-05-18
    Description: The immunosuppressive agents cyclosporin A and FK506 inhibit the transcription of early T cell activation genes. The binding proteins for cyclosporin A and FK506, cyclophilin and FKBP, respectively, are peptidyl-prolyl-cis-trans isomerases, or rotamases. One proposed mechanism for rotamase catalysis by cyclophilin involves a tetrahedral adduct of an amide carbonyl and an enzyme-bound nucleophile. The potent FKBP rotamase inhibitor FK506 has a highly electrophilic carbonyl that is adjacent to an acyl-pipicolinyl (homoprolyl) amide bond. Such a functional group would be expected to form a stabilized, enzyme-bound tetrahedral adduct. Spectroscopic and chemical evidence reveals that the drug interacts noncovalently with its receptor, suggesting that the alpha-keto amid of FK506 serves as a surrogate for the twisted amide of a bound peptide substrate.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Rosen, M K -- Standaert, R F -- Galat, A -- Nakatsuka, M -- Schreiber, S L -- GM-38627/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 1990 May 18;248(4957):863-6.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Chemistry, Harvard University, Cambridge, MA 02138.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/1693013" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Isomerases/*antagonists & inhibitors ; Anti-Bacterial Agents/metabolism/*pharmacology ; Binding Sites ; Carrier Proteins/antagonists & inhibitors/metabolism ; Chemical Phenomena ; Chemistry ; Cloning, Molecular ; Cyclosporins/metabolism/pharmacology ; Escherichia coli/genetics ; Gene Expression ; *Immunosuppressive Agents ; Lymphocyte Activation ; Magnetic Resonance Spectroscopy ; Molecular Structure ; Peptidylprolyl Isomerase ; Recombinant Proteins ; T-Lymphocytes/immunology ; Tacrolimus
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  • 89
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    Anatomy of a conformational change: hinged "lid" motion of the triosephosphate isomerase loop (1990)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 1990-09-21
    Description: Triosephosphate isomerase (TIM) is used as a model system for the study of how a localized conformational change in a protein structure is produced and related to enzyme reactivity. An 11-residue loop region moves more than 7 angstroms and closes over the active site when substrate binds. The loop acts like a "lid" in that it moves rigidly and is attached by two hinges to the remainder of the protein. The nature of the motion appears to be built into the loop by conserved residues; the hinge regions, in contrast, are not conserved. Results of molecular dynamics calculations confirm the structural analysis and suggest a possible ligand-induced mechanism for loop closure.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Joseph, D -- Petsko, G A -- Karplus, M -- New York, N.Y. -- Science. 1990 Sep 21;249(4975):1425-8.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Chemistry, Massachusetts Institute of Technology, Cambridge 02139.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2402636" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Binding Sites ; Carbohydrate Epimerases/*metabolism ; Hydrogen Bonding ; Models, Molecular ; Molecular Sequence Data ; Protein Binding ; *Protein Conformation ; Software ; Triose-Phosphate Isomerase/*metabolism
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  • 90
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    A bacterial enhancer functions to tether a transcriptional activator near a promoter (1990)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 1990-04-27
    Description: The nitrogen regulatory protein NtrC of enteric bacteria activates transcription of the glnA gene by catalyzing isomerization of closed complexes between RNA polymerase and the glnA promoter to open complexes. NtrC binds to sites upstream of glnA that have properties of eukaryotic transcriptional enhancers. NtrC-binding sites were found to facilitate open complex formation when these sites and the glnA promoter were located on different rings of a singly linked catenane, but not when the two rings were decatenated. The results provide evidence that NtrC contacts RNA polymerase-promoter complexes in a process mediated by formation of a DNA loop. NtrC-binding sites serve to tether NtrC near the glnA promoter, thereby increasing the frequency of collisions between NtrC and polymerase-promoter complexes.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Wedel, A -- Weiss, D S -- Popham, D -- Droge, P -- Kustu, S -- GM 38361/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 1990 Apr 27;248(4954):486-90.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Plant Pathology, University of California, Berkeley 94720.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/1970441" target="_blank"〉PubMed〈/a〉
    Keywords: Bacterial Proteins/*metabolism ; Binding Sites ; DNA Transposable Elements ; DNA, Bacterial/metabolism ; DNA, Superhelical/metabolism ; DNA-Binding Proteins/*metabolism ; DNA-Directed RNA Polymerases/metabolism ; *Enhancer Elements, Genetic ; Glutamate-Ammonia Ligase/*genetics ; Nucleotidyltransferases/metabolism ; PII Nitrogen Regulatory Proteins ; Plasmids ; *Promoter Regions, Genetic ; Templates, Genetic ; *Trans-Activators ; *Transcription Factors ; *Transcription, Genetic ; Transposases
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  • 91
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    Two gap genes mediate maternal terminal pattern information in Drosophila (1990)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 1990-04-27
    Description: In Drosophila three maternal pattern organizing activities, the anterior, the posterior, and the terminal, establish the anterior-posterior body pattern of the embryo by initiating the spatially restricted activities of the gap class of zygotic segmentation genes. The activities of tailless (tll) and the newly identified gap gene huckebein (hkb) are specifically involved in mediating the maternal terminal information at the posterior end of the blastoderm embryo.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Weigel, D -- Jurgens, G -- Klingler, M -- Jackle, H -- New York, N.Y. -- Science. 1990 Apr 27;248(4954):495-8.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Universitat Munchen, Institut fur Genetik und Mikrobiologie, Federal Republic of Germany.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2158673" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Blastoderm/*physiology ; Cell Differentiation ; Drosophila/embryology/*genetics ; Female ; Gene Expression ; Genes/*physiology ; Genotype ; Mutation ; Phenotype ; Protein-Tyrosine Kinases/genetics ; Receptors, Cell Surface/genetics ; Suppression, Genetic
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    Characterization of an extremely large, ligand-induced conformational change in plasminogen (1990)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1990-04-06
    Description: Native human plasminogen has a radius of gyration of 39 angstroms. Upon occupation of a weak lysine binding site, the radius of gyration increases to 56 angstroms, an extremely large ligand-induced conformational change. There are no intermediate conformational states between the closed and open form. The conformational chang is not accompanied by a change in secondary structure, hence the closed conformation is formed by interaction between domains that is abolished upon conversion to the open form. This reversible change in conformation, in which the shape of the protein changes from that best described by a prolate ellipsoid to a flexible structure best described by a Debye random coil, is physiologically relevant because a weak lysine binding site regulates the activation of plasminogen.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Mangel, W F -- Lin, B H -- Ramakrishnan, V -- New York, N.Y. -- Science. 1990 Apr 6;248(4951):69-73.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Biology Department, Brookhaven National Laboratory, Upton, NY 11973.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2108500" target="_blank"〉PubMed〈/a〉
    Keywords: Aminocaproic Acid/metabolism/pharmacology ; Binding Sites ; Chemistry, Physical ; Circular Dichroism ; Deuterium ; Humans ; Lysine/metabolism ; Neutrons ; Physicochemical Phenomena ; *Plasminogen/metabolism ; Plasminogen Activators/pharmacology ; Protein Conformation/drug effects ; Scattering, Radiation ; Urokinase-Type Plasminogen Activator/pharmacology ; Water
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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