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  • Models, Molecular  (19)
  • American Association for the Advancement of Science (AAAS)  (19)
  • 1990-1994  (19)
  • 1980-1984
  • 1935-1939
  • 1930-1934
  • 1991  (19)
  • 1934
Collection
Keywords
Publisher
  • American Association for the Advancement of Science (AAAS)  (19)
Years
  • 1990-1994  (19)
  • 1980-1984
  • 1935-1939
  • 1930-1934
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  • 1
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    Structurally homologous ligand binding of integrin Mac-1 and viral glycoprotein C receptors (1991)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1991-11-22
    Description: Three spatially distant surface loops were found to mediate the interaction of the coagulation protein factor X with the leukocyte integrin Mac-1. This interacting region, which by computational modeling defines a three-dimensional macromotif in the catalytic domain, was also recognized by glycoprotein C (gC), a factor X receptor expressed on herpes simplex virus (HSV)-infected endothelial cells. Peptidyl mimicry of each loop inhibited factor X binding to Mac-1 and gC, blocked monocyte generation of thrombin, and prevented monocyte adhesion to HSV-infected endothelium. These data link the ligand recognition of Mac-1 to established mechanisms of receptor-mediated vascular injury.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Altieri, D C -- Etingin, O R -- Fair, D S -- Brunck, T K -- Geltosky, J E -- Hajjar, D P -- Edgington, T S -- HL 46408/HL/NHLBI NIH HHS/ -- P01 HL 16411/HL/NHLBI NIH HHS/ -- R01 HL 43773/HL/NHLBI NIH HHS/ -- etc. -- New York, N.Y. -- Science. 1991 Nov 22;254(5035):1200-2.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Immunology, Scripps Research Institute, La Jolla, CA 92037.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/1957171" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Binding, Competitive ; Cell Line ; Factor X/*metabolism/ultrastructure ; Humans ; In Vitro Techniques ; Ligands ; Macrophage-1 Antigen/*metabolism ; Models, Molecular ; Molecular Sequence Data ; Peptides/chemistry/metabolism ; Protein Conformation ; Viral Envelope Proteins/*metabolism
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
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  • 2
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    Three-dimensional structures of the ligand-binding domain of the bacterial aspartate receptor with and without a ligand (1991)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1991-12-09
    Description: The three-dimensional structure of an active, disulfide cross-linked dimer of the ligand-binding domain of the Salmonella typhimurium aspartate receptor and that of an aspartate complex have been determined by x-ray crystallographic methods at 2.4 and 2.0 angstrom (A) resolution, respectively. A single subunit is a four-alpha-helix bundle with two long amino-terminal and carboxyl-terminal helices and two shorter helices that form a cylinder 20 A in diameter and more than 70 A long. The two subunits in the disulfide-bonded dimer are related by a crystallographic twofold axis in the apo structure, but by a noncrystallographic twofold axis in the aspartate complex structure. The latter structure reveals that the ligand binding site is located more than 60 A from the presumed membrane surface and is at the interface of the two subunits. Aspartate binds between two alpha helices from one subunit and one alpha helix from the other in a highly charged pocket formed by three arginines. The comparison of the apo and aspartate complex structures shows only small structural changes in the individual subunits, except for one loop region that is disordered, but the subunits appear to change orientation relative to each other. The structures of the two forms of this protein provide a step toward understanding the mechanisms of transmembrane signaling.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Milburn, M V -- Prive, G G -- Milligan, D L -- Scott, W G -- Yeh, J -- Jancarik, J -- Koshland, D E Jr -- Kim, S H -- AI 30725/AI/NIAID NIH HHS/ -- DK09765/DK/NIDDK NIH HHS/ -- New York, N.Y. -- Science. 1991 Nov 29;254(5036):1342-7.〈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/1660187" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Aspartic Acid/metabolism ; Binding Sites ; Disulfides/analysis ; Hydrogen Bonding ; Models, Molecular ; Molecular Sequence Data ; Protein Conformation ; *Receptors, Amino Acid ; Receptors, Cell Surface/*chemistry/metabolism ; Salmonella typhimurium/metabolism ; X-Ray Diffraction
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  • 3
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    Recognition of a cell-surface oligosaccharide of pathogenic Salmonella by an antibody Fab fragment (1991)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1991-07-26
    Description: The 2.05 angstrom (A) resolution crystal structure of a dodecasaccharide-Fab complex revealed an unusual carbohydrate recognition site, defined by aromatic amino acids and a structured water molecule, rather than the carboxylic acid and amide side chains and a structured water molecule, rather than the carboxylic acid and amide side chains that are features of transport and other carbohydrate binding proteins. A trisaccharide epitope of a branched bacterial lipopolysaccharide fills this hydrophobic pocket (8 A deep by 7 A wide) in an entropy-assisted association (association constant = 2.05 x 10(5) liters per mole, enthalpy = -20.5 +/- 1.7 kilojoules per mole, and temperature times entropy = +10.0 +/- 2.9 kilojoules per mole). The requirement for the complementarity of van der Waals surfaces and the requirements of saccharide-saccharide and protein-saccharide hydrogen-bonding networks determine the antigen conformation adopted in the bound state.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Cygler, M -- Rose, D R -- Bundle, D R -- New York, N.Y. -- Science. 1991 Jul 26;253(5018):442-5.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Biotechnology Research Institute, National Research Council of Canada, Montreal, Quebec.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/1713710" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; *Antigen-Antibody Complex ; Carbohydrate Conformation ; Carbohydrate Sequence ; Epitopes/chemistry ; Humans ; Immunoglobulin Fab Fragments/chemistry/*immunology ; Immunoglobulin G/classification/*immunology ; Lipopolysaccharides/chemistry/*immunology ; Models, Molecular ; Molecular Sequence Data ; Oligosaccharides/chemistry/*immunology ; Protein Conformation ; Salmonella/*immunology/pathogenicity
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  • 4
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    Structure of a peptide inhibitor bound to the catalytic subunit of cyclic adenosine monophosphate-dependent protein kinase (1991)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1991-07-26
    Description: The structure of a 20-amino acid peptide inhibitor bound to the catalytic subunit of cyclic AMP-dependent protein kinase, and its interactions with the enzyme, are described. The x-ray crystal structure of the complex is the basis of the analysis. The peptide inhibitor, derived from a naturally occurring heat-stable protein kinase inhibitor, contains an amphipathic helix that is followed by a turn and an extended conformation. The extended region occupies the cleft between the two lobes of the enzyme and contains a five-residue consensus recognition sequence common to all substrates and peptide inhibitors of the catalytic subunit. The helical portion of the peptide binds to a hydrophobic groove and conveys high affinity binding. Loops from both domains converge at the active site and contribute to a network of conserved residues at the sites of magnesium adenosine triphosphate binding and catalysis. Amino acids associated with peptide recognition, nonconserved, extend over a large surface area.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Knighton, D R -- Zheng, J H -- Ten Eyck, L F -- Xuong, N H -- Taylor, S S -- Sowadski, J M -- RR01644/RR/NCRR NIH HHS/ -- T32CA09523/CA/NCI NIH HHS/ -- T32DK07233/DK/NIDDK NIH HHS/ -- New York, N.Y. -- Science. 1991 Jul 26;253(5018):414-20.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Chemistry, University of California, San Diego, La Jolla 92093-0654.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/1862343" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Carrier Proteins/*chemistry/metabolism ; Computer Simulation ; Enzyme Inhibitors/*chemistry ; *Intracellular Signaling Peptides and Proteins ; Macromolecular Substances ; Models, Molecular ; Molecular Sequence Data ; Protein Conformation ; Protein Kinases/*chemistry/metabolism ; X-Ray Diffraction
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  • 5
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    Crystal structure of defensin HNP-3, an amphiphilic dimer: mechanisms of membrane permeabilization (1991)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1991-03-22
    Description: Defensins (molecular weight 3500 to 4000) act in the mammalian immune response by permeabilizing the plasma membranes of a broad spectrum of target organisms, including bacteria, fungi, and enveloped viruses. The high-resolution crystal structure of defensin HNP-3 (1.9 angstrom resolution, R factor 0.19) reveals a dimeric beta sheet that has an architecture very different from other lytic peptides. The dimeric assembly suggests mechanisms by which defensins might bind to and permeabilize the lipid bilayer.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Hill, C P -- Yee, J -- Selsted, M E -- Eisenberg, D -- New York, N.Y. -- Science. 1991 Mar 22;251(5000):1481-5.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Eisenberg, Molecular Biology Institute, Los Angeles, CA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2006422" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Animals ; Blood Proteins/chemistry/*ultrastructure ; Cell Membrane Permeability ; Crystallography ; Defensins ; Guinea Pigs ; Humans ; Macromolecular Substances ; Membrane Proteins/chemistry/ultrastructure ; Models, Molecular ; Molecular Sequence Data ; Molecular Structure ; Protein Conformation ; Rabbits ; Rats ; Structure-Activity Relationship ; X-Ray Diffraction ; *alpha-Defensins
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  • 6
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    Tissue-specific splicing in vivo of the beta-tropomyosin gene: dependence on an RNA secondary structure (1991)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1991-06-28
    Description: The beta-tropomyosin gene in chicken contains two mutually exclusive exons (exons 6A and 6B) which are used by the splicing apparatus in myogenic cells, respectively, before (myoblast stage) and after (myotube stage) differentiation. The myoblast splicing pattern is shown to depend on multiple sequence elements that are located in the upstream intron and in the exon 6B and that exert a negative control over exon 6B splicing. This regulation of splicing is due, at least in part, to a secondary structure of the primary transcript, which limits in vivo the accessibility of exon 6B in myoblasts.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Libri, D -- Piseri, A -- Fiszman, M Y -- New York, N.Y. -- Science. 1991 Jun 28;252(5014):1842-5.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Institut Pasteur, Paris, France.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2063196" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Base Sequence ; Chickens ; Exons ; Introns ; Models, Molecular ; Molecular Sequence Data ; Muscles/physiology ; Mutagenesis, Site-Directed ; Nucleic Acid Conformation ; RNA Precursors/*genetics ; *RNA Splicing ; RNA, Messenger/*genetics ; Transcription, Genetic ; Tropomyosin/*genetics
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  • 7
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    Three-dimensional structure of the LDL receptor-binding domain of human apolipoprotein E (1991)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1991-06-28
    Description: Human apolipoprotein E, a blood plasma protein, mediates the transport and uptake of cholesterol and lipid by way of its high affinity interaction with different cellular receptors, including the low-density lipoprotein (LDL) receptor. The three-dimensional structure of the LDL receptor-binding domain of apoE has been determined at 2.5 angstrom resolution by x-ray crystallography. The protein forms an unusually elongated (65 angstroms) four-helix bundle, with the helices apparently stabilized by a tightly packed hydrophobic core that includes leucine zipper-type interactions and by numerous salt bridges on the mostly charged surface. Basic amino acids important for LDL receptor binding are clustered into a surface patch on one long helix. This structure provides the basis for understanding the behavior of naturally occurring mutants that can lead to atherosclerosis.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Wilson, C -- Wardell, M R -- Weisgraber, K H -- Mahley, R W -- Agard, D A -- HL-41633/HL/NHLBI NIH HHS/ -- New York, N.Y. -- Science. 1991 Jun 28;252(5014):1817-22.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Howard Hughes Medical Institute, University of California, San Francisco 94143-0448.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2063194" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Apolipoproteins E/*chemistry/genetics/metabolism ; Binding Sites ; Computer Graphics ; Humans ; Models, Molecular ; Molecular Sequence Data ; Protein Conformation ; Receptors, LDL/*metabolism ; X-Ray Diffraction
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  • 8
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    Atomic structure of adenosine deaminase complexed with a transition-state analog: understanding catalysis and immunodeficiency mutations (1991)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1991-05-31
    Description: The crystal structure of a murine adenosine deaminase complexed with 6-hydroxyl-1,6-dihydropurine ribonucleoside, a nearly ideal transition-state analog, has been determined and refined at 2.4 angstrom resolution. The structure is folded as an eight-stranded parallel alpha/beta barrel with a deep pocket at the beta-barrel COOH-terminal end wherein the inhibitor and a zinc are bound and completely sequestered. The presence of the zinc cofactor and the precise structure of the bound analog were not previously known. The 6R isomer of the analog is very tightly held in place by the coordination of the 6-hydroxyl to the zinc and the formation of nine hydrogen bonds. On the basis of the structure of the complex a stereoselective addition-elimination or SN2 mechanism of the enzyme is proposed with the zinc atom and the Glu and Asp residues playing key roles. A molecular explanation of a hereditary disease caused by several point mutations of an enzyme is also presented.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Wilson, D K -- Rudolph, F B -- Quiocho, F A -- CA14030/CA/NCI NIH HHS/ -- New York, N.Y. -- Science. 1991 May 31;252(5010):1278-84.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Howard Hughes Medical Institute, Baylor College of Medicine, Houston, TX 77030.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/1925539" target="_blank"〉PubMed〈/a〉
    Keywords: Adenosine Deaminase/*chemistry/deficiency/metabolism ; Amino Acid Sequence ; Animals ; Binding Sites ; Catalysis ; Crystallization ; Immunologic Deficiency Syndromes/*enzymology/genetics ; Mice ; Models, Molecular ; Molecular Structure ; Mutation ; Protein Conformation ; Purine Nucleosides/chemistry/*metabolism ; Ribonucleosides/chemistry/*metabolism ; Zinc/metabolism
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  • 9
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    Long-range structure in ribonuclease P RNA (1991)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1991-11-08
    Description: Phylogenetic-comparative and mutational analyses were used to elucidate the structure of the catalytically active RNA component of eubacterial ribonuclease P (RNase P). In addition to the refinement and extension of known structural elements, the analyses revealed a long-range interaction that results in a second pseudoknot in the RNA. This feature strongly constrains the three-dimensional structure of RNase P RNA near the active site. Some RNase P RNAs lack this structure but contain a unique, possibly compensating, structural domain. This suggests that different RNA structures located at different positions in the sequence may have equivalent architectural functions in RNase P RNA.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Haas, E S -- Morse, D P -- Brown, J W -- Schmidt, F J -- Pace, N R -- GM34527/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 1991 Nov 8;254(5033):853-6.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Biology, Indiana University, Bloomington 47405.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/1719634" target="_blank"〉PubMed〈/a〉
    Keywords: Bacillus subtilis/enzymology/genetics ; Base Composition ; Base Sequence ; Biological Evolution ; Endoribonucleases/*genetics ; Escherichia coli/enzymology/genetics ; *Escherichia coli Proteins ; Models, Molecular ; Molecular Sequence Data ; Mutagenesis ; Nucleic Acid Conformation ; RNA, Bacterial/*genetics ; RNA, Catalytic/*genetics ; Ribonuclease P
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  • 10
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    Identity elements for specific aminoacylation of yeast tRNA(Asp) by cognate aspartyl-tRNA synthetase (1991)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1991-06-21
    Description: The nucleotides crucial for the specific aminoacylation of yeast tRNA(Asp) by its cognate synthetase have been identified. Steady-state aminoacylation kinetics of unmodified tRNA transcripts indicate that G34, U35, C36, and G73 are important determinants of tRNA(Asp) identity. Mutations at these positions result in a large decrease (19- to 530-fold) of the kinetic specificity constant (ratio of the catalytic rate constant kcat and the Michaelis constant Km) for aspartylation relative to wild-type tRNA(Asp). Mutation to G10-C25 within the D-stem reduced kcat/Km eightfold. This fifth mutation probably indirectly affects the presentation of the highly conserved G10 nucleotide to the synthetase. A yeast tRNA(Phe) was converted into an efficient substrate for aspartyl-tRNA synthetase through introduction of the five identity elements. The identity nucleotides are located in regions of tight interaction between tRNA and synthetase as shown in the crystal structure of the complex and suggest sites of base-specific contacts.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Putz, J -- Puglisi, J D -- Florentz, C -- Giege, R -- New York, N.Y. -- Science. 1991 Jun 21;252(5013):1696-9.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Laboratoire de Biochimie, Institut de Biologie Moleculaire et Cellulaire du CNRS, Strasbourg, France.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2047878" target="_blank"〉PubMed〈/a〉
    Keywords: Aspartate-tRNA Ligase/*metabolism ; Base Sequence ; Computer Graphics ; DNA Mutational Analysis ; Fungal Proteins/metabolism ; Kinetics ; Models, Molecular ; Molecular Sequence Data ; RNA, Fungal/metabolism ; RNA, Transfer, Amino Acyl/metabolism ; RNA, Transfer, Asp/*metabolism ; Saccharomyces cerevisiae/*enzymology ; Structure-Activity Relationship ; Substrate Specificity ; *Transfer RNA Aminoacylation
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