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  • Models, Molecular  (214)
  • Chemistry
  • American Association for the Advancement of Science (AAAS)  (227)
  • 1990-1994  (227)
  • 1955-1959
  • 1950-1954
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  • 1
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    Crystal structure of the catalytic domain of HIV-1 integrase: similarity to other polynucleotidyl transferases (1994)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1994-12-23
    Description: HIV integrase is the enzyme responsible for inserting the viral DNA into the host chromosome; it is essential for HIV replication. The crystal structure of the catalytically active core domain (residues 50 to 212) of HIV-1 integrase was determined at 2.5 A resolution. The central feature of the structure is a five-stranded beta sheet flanked by helical regions. The overall topology reveals that this domain of integrase belongs to a superfamily of polynucleotidyl transferases that includes ribonuclease H and the Holliday junction resolvase RuvC. The active site region is identified by the position of two of the conserved carboxylate residues essential for catalysis, which are located at similar positions in ribonuclease H. In the crystal, two molecules form a dimer with a extensive solvent-inaccessible interface of 1300 A2 per monomer.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Dyda, F -- Hickman, A B -- Jenkins, T M -- Engelman, A -- Craigie, R -- Davies, D R -- New York, N.Y. -- Science. 1994 Dec 23;266(5193):1981-6.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Laboratory of Molecular Biology, NIDDK, NIH, Bethesda, MD 20892-0560.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/7801124" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Binding Sites ; Crystallization ; Crystallography, X-Ray ; DNA Nucleotidyltransferases/*chemistry ; HIV-1/*enzymology ; Hydrogen Bonding ; Integrases ; Models, Molecular ; Molecular Sequence Data ; Protein Folding ; Protein Structure, Secondary ; Ribonuclease H/chemistry ; Solubility ; Virus Integration
    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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    An all D-amino acid opioid peptide with central analgesic activity from a combinatorial library (1994)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1994-12-23
    Description: A synthetic combinatorial library containing 52,128,400 D-amino acid hexapeptides was used to identify a ligand for the mu opioid receptor. The peptide, Ac-rfwink-NH2, bears no resemblance to any known opioid peptide. Simulations using molecular dynamics, however, showed that three amino acid moieties have the same spatial orientation as the corresponding pharmacophoric groups of the opioid peptide PLO17. Ac-rfwink-NH2 was shown to be a potent agonist at the mu receptor and induced long-lasting analgesia in mice. Analgesia produced by intraperitoneally administered Ac-rfwink-NH2 was blocked by intracerebroventricular administration of naloxone, demonstrating that this peptide may cross the blood-brain barrier.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Dooley, C T -- Chung, N N -- Wilkes, B C -- Schiller, P W -- Bidlack, J M -- Pasternak, G W -- Houghten, R A -- DA-000138/DA/NIDA NIH HHS/ -- DA-02615/DA/NIDA NIH HHS/ -- DA-03742/DA/NIDA NIH HHS/ -- etc. -- New York, N.Y. -- Science. 1994 Dec 23;266(5193):2019-22.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Torrey Pines Institute for Molecular Studies, San Diego, CA 92121.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/7801131" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Analgesics/chemistry/metabolism/*pharmacology ; Animals ; Brain/metabolism ; Dose-Response Relationship, Drug ; Endorphins/pharmacology ; Enkephalin, Ala(2)-MePhe(4)-Gly(5)- ; Enkephalin, D-Penicillamine (2,5)- ; Enkephalins/metabolism ; Guinea Pigs ; Injections, Intraventricular ; Male ; Mice ; Models, Molecular ; Molecular Sequence Data ; Naloxone/administration & dosage/pharmacology ; Opioid Peptides/chemistry/metabolism/*pharmacology ; Pain Measurement ; Protein Conformation ; Rats ; Receptors, Opioid, mu/agonists/metabolism ; Stereoisomerism
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  • 3
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    HIV integrase structure catalyzes drug search (1994)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1994-12-23
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉O'Brien, C -- New York, N.Y. -- Science. 1994 Dec 23;266(5193):1946.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/7801119" target="_blank"〉PubMed〈/a〉
    Keywords: Antiviral Agents/pharmacology ; Binding Sites ; Crystallization ; Crystallography, X-Ray ; DNA Nucleotidyltransferases/antagonists & inhibitors/*chemistry/metabolism ; DNA-Binding Proteins/metabolism ; Drug Design ; HIV-1/drug effects/*enzymology ; Integrases ; Models, Molecular ; Virus Integration
    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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    A unified polymerase mechanism for nonhomologous DNA and RNA polymerases (1994)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1994-12-23
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Steitz, T A -- Smerdon, S J -- Jager, J -- Joyce, C M -- GM28550/GM/NIGMS NIH HHS/ -- GM39546/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 1994 Dec 23;266(5193):2022-5.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/7528445" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Binding Sites ; Crystallization ; Crystallography, X-Ray ; DNA Polymerase I/*chemistry/metabolism ; DNA-Directed RNA Polymerases/*chemistry/metabolism ; HIV Reverse Transcriptase ; Models, Molecular ; Molecular Sequence Data ; Protein Conformation ; Protein Folding ; RNA-Directed DNA Polymerase/*chemistry/metabolism ; Viral Proteins
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    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 5
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    DNA bending by asymmetric phosphate neutralization (1994)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1994-12-16
    Description: DNA is often bent when complexed with proteins. Understanding the forces responsible for DNA bending would be of fundamental value in exploring the interplay of these macromolecules. A series of experiments was devised to test the hypothesis that proteins with cationic surfaces can induce substantial DNA bending by neutralizing phosphates on one DNA face. Repulsions between phosphates in the remaining anionic helix are predicted to result in an unbalanced compression force acting to deform the DNA toward the protein. This hypothesis is supported by the results of electrophoretic experiments in which DNA spontaneously bends when one helical face is partially modified by incorporation of neutral phosphate analogs. Phasing with respect to a site of intrinsic DNA curvature (hexadeoxyadenylate tract) permits estimation of the electrostatic bend angle, and demonstrates that such modified DNAs are deformed toward the neutralized surface, as predicted. Similar model systems may be useful in exploring the extent to which phosphate neutralization can account for DNA bending by particular proteins.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Strauss, J K -- Maher, L J 3rd -- GM47814/GM/NIGMS NIH HHS/ -- P30 CA36727-08/CA/NCI NIH HHS/ -- New York, N.Y. -- Science. 1994 Dec 16;266(5192):1829-34.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Eppley Institute for Research in Cancer and Allied Diseases, University of Nebraska Medical Center, Omaha 68198-6805.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/7997878" target="_blank"〉PubMed〈/a〉
    Keywords: Base Sequence ; Cations/chemistry ; DNA/*chemistry ; DNA-Binding Proteins/chemistry ; Electrochemistry ; Electrophoresis, Polyacrylamide Gel ; Models, Molecular ; Molecular Sequence Data ; *Nucleic Acid Conformation ; Nucleosomes/chemistry ; Oligodeoxyribonucleotides ; Organophosphorus Compounds/chemistry ; Phosphates/*chemistry ; Thermodynamics
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    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 6
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    Toxic shock syndrome toxin-1 complexed with a class II major histocompatibility molecule HLA-DR1 (1994)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1994-12-16
    Description: The three-dimensional structure of a Staphylococcus aureus superantigen, toxic shock syndrome toxin-1 (TSST-1), complexed with a human class II major histocompatibility molecule (DR1), was determined by x-ray crystallography. The TSST-1 binding site on DR1 overlaps that of the superantigen S. aureus enterotoxin B (SEB), but the two binding modes differ. Whereas SEB binds primarily off one edge of the peptide binding site of DR1, TSST-1 extends over almost one-half of the binding site and contacts both the flanking alpha helices of the histocompatibility antigen and the bound peptide. This difference suggests that the T cell receptor (TCR) would bind to TSST-1:DR1 very differently than to DR1:peptide or SEB:DR1. It also suggests that TSST-1 binding may be dependent on the peptide, though less so than TCR binding, providing a possible explanation for the inability of TSST-1 to competitively block SEB binding to all DR1 molecules on cells (even though the binding sites of TSST-1 and SEB on DR1 overlap almost completely) and suggesting the possibility that T cell activation by superantigen could be directed by peptide antigen.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Kim, J -- Urban, R G -- Strominger, J L -- Wiley, D C -- New York, N.Y. -- Science. 1994 Dec 16;266(5192):1870-4.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Howard Hughes Medical Institute, Children's Hospital, Boston, MA 02115.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/7997880" target="_blank"〉PubMed〈/a〉
    Keywords: *Bacterial Toxins ; Binding Sites ; Crystallography, X-Ray ; Enterotoxins/*chemistry/metabolism ; HLA-DR1 Antigen/*chemistry/metabolism ; Humans ; Hydrogen Bonding ; Models, Molecular ; Protein Conformation ; Protein Structure, Secondary ; Receptors, Antigen, T-Cell/metabolism ; *Staphylococcus aureus ; Superantigens/*chemistry/metabolism
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  • 7
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    How a protein binds B12: A 3.0 A X-ray structure of B12-binding domains of methionine synthase (1994)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1994-12-09
    Description: The crystal structure of a 27-kilodalton methylcobalamin-containing fragment of methionine synthase from Escherichia coli was determined at 3.0 A resolution. This structure depicts cobalamin-protein interactions and reveals that the corrin macrocycle lies between a helical amino-terminal domain and an alpha/beta carboxyl-terminal domain that is a variant of the Rossmann fold. Methylcobalamin undergoes a conformational change on binding the protein; the dimethylbenzimidazole group, which is coordinated to the cobalt in the free cofactor, moves away from the corrin and is replaced by a histidine contributed by the protein. The sequence Asp-X-His-X-X-Gly, which contains this histidine ligand, is conserved in the adenosylcobalamin-dependent enzymes methylmalonyl-coenzyme A mutase and glutamate mutase, suggesting that displacement of the dimethylbenzimidazole will be a feature common to many cobalamin-binding proteins. Thus the cobalt ligand, His759, and the neighboring residues Asp757 and Ser810, may form a catalytic quartet, Co-His-Asp-Ser, that modulates the reactivity of the B12 prosthetic group in methionine synthase.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Drennan, C L -- Huang, S -- Drummond, J T -- Matthews, R G -- Lidwig, M L -- GM08570/GM/NIGMS NIH HHS/ -- GM16429/GM/NIGMS NIH HHS/ -- GM24908/GM/NIGMS NIH HHS/ -- etc. -- New York, N.Y. -- Science. 1994 Dec 9;266(5191):1669-74.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Biophysics Research Division, University of Michigan, Ann Arbor 48109-1055.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/7992050" target="_blank"〉PubMed〈/a〉
    Keywords: 5-Methyltetrahydrofolate-Homocysteine S-Methyltransferase/*chemistry/metabolism ; Amino Acid Isomerases/chemistry ; Amino Acid Sequence ; Benzimidazoles ; Catalysis ; Computer Graphics ; Crystallography, X-Ray ; Electron Spin Resonance Spectroscopy ; Escherichia coli/*enzymology ; Histidine/metabolism ; *Intramolecular Transferases ; Ligands ; Methylation ; Methylmalonyl-CoA Mutase/chemistry ; Models, Molecular ; Molecular Sequence Data ; Protein Conformation ; Protein Folding ; Protein Structure, Secondary ; Vitamin B 12/*analogs & derivatives/chemistry/metabolism
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  • 8
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    Molecular basis of mammalian sexual determination: activation of Mullerian inhibiting substance gene expression by SRY (1994)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1994-12-02
    Description: The pathway of male sexual development in mammals is initiated by SRY, a gene on the short arm of the Y chromosome. Its expression in the differentiating gonadal ridge directs testicular morphogenesis, characterized by elaboration of Mullerian inhibiting substance (MIS) and testosterone. SRY and MIS each belong to conserved gene families that function in the control of growth and differentiation. Structural and biochemical studies of the DNA binding domain of SRY (the HMG box) revealed a protein-DNA interaction consisting of partial side chain intercalation into a widened minor groove. Functional studies of SRY in a cell line from embryonic gonadal ridge demonstrated activation of a gene-regulatory pathway leading to expression of MIS. SRY molecules containing mutations associated with human sex reversal have altered structural interactions with DNA and failed to induce transcription of MIS.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Haqq, C M -- King, C Y -- Ukiyama, E -- Falsafi, S -- Haqq, T N -- Donahoe, P K -- Weiss, M A -- GM51558/GM/NIGMS NIH HHS/ -- HD30812/HD/NICHD NIH HHS/ -- P30HD28138/HD/NICHD NIH HHS/ -- New York, N.Y. -- Science. 1994 Dec 2;266(5190):1494-500.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Pediatric Surgical Research Laboratory, Massachusetts General Hospital, Boston 02114.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/7985018" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Animals ; Anti-Mullerian Hormone ; Base Sequence ; Cell Line ; DNA/metabolism ; DNA-Binding Proteins/chemistry/*genetics/metabolism ; Female ; *Gene Expression Regulation, Developmental ; Genitalia, Male/*embryology ; *Glycoproteins ; Growth Inhibitors/biosynthesis/*genetics ; Humans ; Male ; Models, Biological ; Models, Molecular ; Molecular Sequence Data ; Mullerian Ducts ; *Nuclear Proteins ; Sex Differentiation/*genetics ; Sex-Determining Region Y Protein ; Testicular Hormones/biosynthesis/*genetics ; Transcription Factors/chemistry/*genetics/metabolism
    Print ISSN: 0036-8075
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  • 9
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    Two binding orientations for peptides to the Src SH3 domain: development of a general model for SH3-ligand interactions (1994)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1994-11-18
    Description: Solution structures of two Src homology 3 (SH3) domain-ligand complexes have been determined by nuclear magnetic resonance. Each complex consists of the SH3 domain and a nine-residue proline-rich peptide selected from a large library of ligands prepared by combinatorial synthesis. The bound ligands adopt a left-handed polyproline type II (PPII) helix, although the amino to carboxyl directionalities of their helices are opposite. The peptide orientation is determined by a salt bridge formed by the terminal arginine residues of the ligands and the conserved aspartate-99 of the SH3 domain. Residues at positions 3, 4, 6, and 7 of both peptides also intercalate into the ligand-binding site; however, the respective proline and nonproline residues show exchanged binding positions in the two complexes. These structural results led to a model for the interactions of SH3 domains with proline-rich peptides that can be used to predict critical residues in complexes of unknown structure. The model was used to identify correctly both the binding orientation and the contact and noncontact residues of a peptide derived from the nucleotide exchange factor Sos in association with the amino-terminal SH3 domain of the adaptor protein Grb2.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Feng, S -- Chen, J K -- Yu, H -- Simon, J A -- Schreiber, S L -- GM44993/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 1994 Nov 18;266(5188):1241-7.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Howard Hughes Medical Institute, 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/7526465" target="_blank"〉PubMed〈/a〉
    Keywords: *Adaptor Proteins, Signal Transducing ; Alanine/chemistry ; Amino Acid Sequence ; Arginine/chemistry ; Binding Sites ; GRB2 Adaptor Protein ; Glycine/chemistry ; Guanine Nucleotide Exchange Factors ; Ligands ; Magnetic Resonance Spectroscopy ; Models, Molecular ; Molecular Sequence Data ; Oligopeptides/chemistry/*metabolism ; Peptides/chemistry/metabolism ; Proline/chemistry ; Proline-Rich Protein Domains ; Protein Conformation ; Protein Structure, Secondary ; Protein-Tyrosine Kinases/chemistry/*metabolism ; Proteins/chemistry/metabolism ; Proto-Oncogene Proteins pp60(c-src)/chemistry/*metabolism ; src-Family Kinases
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  • 10
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    Crystal structure of LacI member, PurR, bound to DNA: minor groove binding by alpha helices (1994)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1994-11-04
    Description: The three-dimensional structure of a ternary complex of the purine repressor, PurR, bound to both its corepressor, hypoxanthine, and the 16-base pair purF operator site has been solved at 2.7 A resolution by x-ray crystallography. The bipartite structure of PurR consists of an amino-terminal DNA-binding domain and a larger carboxyl-terminal corepressor binding and dimerization domain that is similar to that of the bacterial periplasmic binding proteins. The DNA-binding domain contains a helix-turn-helix motif that makes base-specific contacts in the major groove of the DNA. Base contacts are also made by residues of symmetry-related alpha helices, the "hinge" helices, which bind deeply in the minor groove. Critical to hinge helix-minor groove binding is the intercalation of the side chains of Leu54 and its symmetry-related mate, Leu54', into the central CpG-base pair step. These residues thereby act as "leucine levers" to pry open the minor groove and kink the purF operator by 45 degrees.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Schumacher, M A -- Choi, K Y -- Zalkin, H -- Brennan, R G -- GM 24658/GM/NIGMS NIH HHS/ -- GM 49244/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 1994 Nov 4;266(5186):763-70.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Biochemistry and Molecular Biology, Oregon Health Sciences University, Portland 97201-3098.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/7973627" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Bacterial Proteins/*chemistry/genetics/metabolism ; Base Sequence ; Binding Sites ; Computer Graphics ; Crystallography, X-Ray ; DNA/chemistry/*metabolism ; DNA-Binding Proteins/*chemistry/genetics/metabolism ; *Escherichia coli Proteins ; Hydrogen Bonding ; Hypoxanthine ; Hypoxanthines/metabolism ; Lac Repressors ; Models, Molecular ; Molecular Sequence Data ; Nucleic Acid Conformation ; *Operator Regions, Genetic ; Protein Conformation ; Protein Structure, Secondary ; Repressor Proteins/*chemistry/genetics/metabolism
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