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  • Articles  (51)
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  • Articles  (51)
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  • American Association for the Advancement of Science (AAAS)  (51)
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  • 1
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    Persistent site-specific remodeling of a nucleosome array by transient action of the SWI/SNF complex (1996)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1996-07-26
    Description: The SWI/SNF complex participates in the restructuring of chromatin for transcription. The function of the yeast SWI/SNF complex in the remodeling of a nucleosome array has now been analyzed in vitro. Binding of the purified SWI/SNF complex to a nucleosome array disrupted multiple nucleosomes in an adenosine triphosphate-dependent reaction. However, removal of SWI/SNF left a deoxyribonuclease I-hypersensitive site specifically at a nucleosome that was bound by derivatives of the transcription factor Gal4p. Analysis of individual nucleosomes revealed that the SWI/SNF complex catalyzed eviction of histones from the Gal4-bound nucleosomes. Thus, the transient action of the SWI/SNF complex facilitated irreversible disruption of transcription factor-bound nucleosomes.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Owen-Hughes, T -- Utley, R T -- Cote, J -- Peterson, C L -- Workman, J L -- GM47867/GM/NIGMS NIH HHS/ -- R01 GM049650/GM/NIGMS NIH HHS/ -- R37 GM049650/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 1996 Jul 26;273(5274):513-6.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Biochemistry and Molecular Biology and Center for Gene Regulation, Pennsylvania State University, University Park, PA 16802-4500, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/8662543" target="_blank"〉PubMed〈/a〉
    Keywords: Adenosine Triphosphatases ; Adenosine Triphosphate/metabolism ; Base Sequence ; Binding Sites ; DNA, Fungal/metabolism ; DNA-Binding Proteins/*metabolism ; Deoxyribonuclease I/metabolism ; Fungal Proteins/*metabolism ; Histones/metabolism ; Molecular Sequence Data ; *Nuclear Proteins ; Nucleosomes/*metabolism/ultrastructure ; Saccharomyces cerevisiae ; *Saccharomyces cerevisiae Proteins ; Transcription Factors/*metabolism
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  • 2
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    Cooperative DNA binding and sequence-selective recognition conferred by the STAT amino-terminal domain (1996)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1996-08-09
    Description: STAT proteins (signal transducers and activators of transcription) activate distinct target genes despite having similar DNA binding preferences. The transcriptional specificity of STAT proteins was investigated on natural STAT binding sites near the interferon-gamma gene. These sites are arranged in multiple copies and required cooperative interactions for STAT binding. The conserved amino-terminal domain of STAT proteins was required for cooperative DNA binding, although this domain was not essential for dimerization or binding to a single site. Cooperative binding interactions enabled the STAT proteins to recognize variations of the consensus site. These sites can be specific for the different STAT proteins and may function to direct selective transcriptional activation.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Xu, X -- Sun, Y L -- Hoey, T -- New York, N.Y. -- Science. 1996 Aug 9;273(5276):794-7.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Tularik, Two Corporate Drive, South San Francisco, CA 94080, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/8670419" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Base Sequence ; Binding Sites ; Cell Line ; DNA/*metabolism ; DNA-Binding Proteins/chemistry/immunology/*metabolism ; Interferon-gamma/genetics ; Introns ; Molecular Sequence Data ; Mutation ; Oligodeoxyribonucleotides/metabolism ; Promoter Regions, Genetic ; STAT1 Transcription Factor ; STAT4 Transcription Factor ; Sequence Deletion ; Signal Transduction ; Trans-Activators/chemistry/immunology/*metabolism ; *Transcriptional Activation
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    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 3
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    A permease-oxidase complex involved in high-affinity iron uptake in yeast (1996)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1996-03-15
    Description: Iron must cross biological membranes to reach essential intracellular enzymes. Two proteins in the plasma membrane of yeast--a multicopper oxidase, encoded by the FET3 gene, and a permease, encoded by the FTR1 gene--were shown to mediate high-affinity iron uptake. FET3 expression was required for FTR1 protein to be transported to the plasma membrane. FTR1 expression was required for apo-FET3 protein to be loaded with copper and thus acquire oxidase activity. FTR1 protein also played a direct role in iron transport. Mutations in a conserved sequence motif of FTR1 specifically blocked iron transport.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Stearman, R -- Yuan, D S -- Yamaguchi-Iwai, Y -- Klausner, R D -- Dancis, A -- New York, N.Y. -- Science. 1996 Mar 15;271(5255):1552-7.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Cell Biology and Metabolism Branch, National Institutes of Child Health and Human Development, National Institutes of Health, Bethesda, MD 20892, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/8599111" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Binding Sites ; Biological Transport ; Carrier Proteins/chemistry/*genetics/*metabolism ; Cell Membrane/metabolism ; *Ceruloplasmin ; Copper/metabolism/pharmacology ; Endoplasmic Reticulum/metabolism ; Ferric Compounds/metabolism ; Ferritins/chemistry/metabolism ; Ferrous Compounds/metabolism ; Genes, Fungal ; Golgi Apparatus/metabolism ; Iron/*metabolism ; Membrane Transport Proteins/chemistry/*genetics/*metabolism ; Models, Biological ; Molecular Sequence Data ; Multienzyme Complexes/*metabolism ; Mutation ; Open Reading Frames ; Oxidation-Reduction ; Oxidoreductases/*metabolism ; Saccharomyces cerevisiae/genetics/*metabolism ; *Saccharomyces cerevisiae Proteins ; Transformation, Genetic
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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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    Evaluating electrostatic contributions to binding with the use of protein charge ladders (1996)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1996-04-26
    Description: Electrostatic interactions between charges on ligands and charges on proteins that are remote from the binding interface can influence the free energy of binding (delta Gb). The binding affinities between charged ligands and the members of a charge ladder of bovine carbonic anhydrase (CAII) constructed by random acetylation of the amino groups on its surface were measured by affinity capillary electrophoresis (ACE). The values of delta Gb derived from this analysis correlated approximately linearly with the charge. Opposite charges on the ligand and the members of the charge ladder of CAII were stabilizing; like charges were destabilizing. The combination of ACE and protein charge ladders provides a tool for quantitatively examining the contributions of electrostatics to free energies of molecular recognition in biology.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Gao, J -- Mammen, M -- Whitesides, G M -- GM51559/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 1996 Apr 26;272(5261):535-7.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Chemistry, Harvard University, Cambridge, MA 02138, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/8614800" target="_blank"〉PubMed〈/a〉
    Keywords: Acetylation ; Animals ; Binding Sites ; Carbonic Anhydrases/*chemistry/*metabolism ; Cattle ; Electrochemistry ; Electrophoresis, Capillary ; Ligands ; Models, Chemical ; Molecular Weight ; Protein Conformation ; Sulfonamides/metabolism ; Thermodynamics
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  • 5
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    Crystal structure of a group I ribozyme domain: principles of RNA packing (1996)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1996-09-20
    Description: Group I self-splicing introns catalyze their own excision from precursor RNAs by way of a two-step transesterification reaction. The catalytic core of these ribozymes is formed by two structural domains. The 2.8-angstrom crystal structure of one of these, the P4-P6 domain of the Tetrahymena thermophila intron, is described. In the 160-nucleotide domain, a sharp bend allows stacked helices of the conserved core to pack alongside helices of an adjacent region. Two specific long-range interactions clamp the two halves of the domain together: a two-Mg2+-coordinated adenosine-rich corkscrew plugs into the minor groove of a helix, and a GAAA hairpin loop binds to a conserved 11-nucleotide internal loop. Metal- and ribose-mediated backbone contacts further stabilize the close side-by-side helical packing. The structure indicates the extent of RNA packing required for the function of large ribozymes, the spliceosome, and the ribosome.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Cate, J H -- Gooding, A R -- Podell, E -- Zhou, K -- Golden, B L -- Kundrot, C E -- Cech, T R -- Doudna, J A -- 5T32GM08283-07/GM/NIGMS NIH HHS/ -- GM22778-21/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 1996 Sep 20;273(5282):1678-85.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Molecular Biophysics and Biochemistry, Yale University, New Haven, CT 06520, USA. doudna@csb.yale.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/8781224" target="_blank"〉PubMed〈/a〉
    Keywords: Adenine/chemistry ; Animals ; Base Composition ; Base Sequence ; Binding Sites ; Catalysis ; Crystallography, X-Ray ; Hydrogen Bonding ; *Introns ; Magnesium/chemistry ; Models, Molecular ; Molecular Sequence Data ; *Nucleic Acid Conformation ; Phosphates/chemistry ; Phylogeny ; RNA Splicing ; RNA, Catalytic/*chemistry/metabolism ; RNA, Protozoan/*chemistry/metabolism ; Ribose/chemistry ; Tetrahymena thermophila/genetics
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  • 6
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    Structure of the amino-terminal core domain of the HIV-1 capsid protein (1996)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1996-07-12
    Description: The three-dimensional structure of the amino-terminal core domain (residues 1 through 151) of the human immunodeficiency virus-type 1 (HIV-1) capsid protein has been solved by multidimensional heteronuclear magnetic resonance spectroscopy. The structure is unlike those of previously characterized viral coat proteins and is composed of seven alpha helices, two beta hairpins, and an exposed partially ordered loop. The domain is shaped like an arrowhead, with the beta hairpins and loop exposed at the trailing edge and the carboxyl-terminal helix projecting from the tip. The proline residue Pro1 forms a salt bridge with a conserved, buried aspartate residue (Asp51), which suggests that the amino terminus of the protein rearranges upon proteolytic maturation. The binding site for cyclophilin A, a cellular rotamase that is packaged into the HIV-1 virion, is located on the exposed loop and encompasses the essential proline residue Pro90. In the free monomeric domain, Pro90 adopts kinetically trapped cis and trans conformations, raising the possibility that cyclophilin A catalyzes interconversion of the cis- and trans-Pro90 loop structures.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Gitti, R K -- Lee, B M -- Walker, J -- Summers, M F -- Yoo, S -- Sundquist, W I -- AI30917/AI/NIAID NIH HHS/ -- CA 42014/CA/NCI NIH HHS/ -- GM 42561/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 1996 Jul 12;273(5272):231-5.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Howard Hughes Medical Institute and Department of Chemistry and Biochemistry, University of Maryland Baltimore County, Baltimore, MD 21228, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/8662505" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Isomerases/metabolism ; Amino Acid Sequence ; Aspartic Acid/chemistry ; Binding Sites ; Capsid/*chemistry/metabolism ; Carrier Proteins/metabolism ; HIV Core Protein p24/*chemistry/metabolism ; HIV-1/*chemistry ; Magnetic Resonance Spectroscopy ; Models, Molecular ; Molecular Sequence Data ; Peptidylprolyl Isomerase ; Proline/chemistry ; Protein Conformation ; Protein Processing, Post-Translational ; Protein Structure, Secondary ; Protein Structure, Tertiary ; Virion/chemistry
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  • 7
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    Promotion of mitochondrial membrane complex assembly by a proteolytically inactive yeast Lon (1996)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1996-10-04
    Description: Afg3p and Rca1p are adenosine triphosphate (ATP)-dependent metalloproteases in yeast mitochondria. Cells lacking both proteins exhibit defects in respiration-dependent growth, degradation of mitochondrially synthesized proteins, and assembly of inner-membrane complexes. Defects in growth and protein assembly, but not in degradation, were suppressed by overproduction of yeast mitochondrial Lon, an ATP-dependent serine protease. Suppression by Lon was enhanced by inactivation of the proteolytic site and was prevented by mutation of the ATP-binding site. It is suggested that the mitochondrial proteases Lon, Afg3p, and Rca1p can also serve a chaperone-like function in the assembly of mitochondrial protein complexes.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Rep, M -- van Dijl, J M -- Suda, K -- Schatz, G -- Grivell, L A -- Suzuki, C K -- New York, N.Y. -- Science. 1996 Oct 4;274(5284):103-6.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Molecular Cell Biology, University of Amsterdam, Kruislaan 318, 1098 SM Amsterdam, The Netherlands.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/8810243" target="_blank"〉PubMed〈/a〉
    Keywords: ATP-Dependent Proteases ; Adenosine Triphosphatases/metabolism ; Adenosine Triphosphate/metabolism ; Amino Acid Sequence ; Base Sequence ; Binding Sites ; Electron Transport Complex IV/metabolism ; Fungal Proteins/*metabolism ; Heat-Shock Proteins/genetics/*metabolism ; Membrane Proteins/*metabolism ; *Metalloendopeptidases ; Mitochondria/*metabolism ; Mitochondrial Proteins ; Molecular Sequence Data ; Mutagenesis, Site-Directed ; Proton-Translocating ATPases/metabolism ; Saccharomyces cerevisiae/genetics/growth & development/*metabolism ; *Saccharomyces cerevisiae Proteins ; Serine Endopeptidases/genetics/*metabolism
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  • 8
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    Catalytic role of 2'-hydroxyl groups within a group II intron active site (1996)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1996-03-08
    Description: Domain 5 is an essential active-site component of group II intron ribozymes. The role of backbone substituents in D5 function was explored through synthesis of a series of derivatives containing deoxynucleotides at each position along the D5 strand. Kinetic screens revealed that eight 2'-hydroxyl groups were likely to be critical for activity of D5. Through two separate methods, including competitive inhibition and direct kinetic analysis, effects on binding and chemistry were distinguished. Depending on their function, important 2'-hydroxyl groups lie on opposite faces of the molecule, defining distinct loci for molecular recognition and catalysis by D5.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Abramovitz, D L -- Friedman, R A -- Pyle, A M -- GM41371/GM/NIGMS NIH HHS/ -- GM50313/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 1996 Mar 8;271(5254):1410-3.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Biochemistry and Molecular Biophysics, Columbia University College of Physicians and Surgeons, New York, NY 10032, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/8596912" target="_blank"〉PubMed〈/a〉
    Keywords: Base Composition ; Base Sequence ; Binding Sites ; Catalysis ; Exons ; Hydrogen Bonding ; Hydroxyl Radical/chemistry ; *Introns ; Kinetics ; Models, Molecular ; Molecular Sequence Data ; Nucleic Acid Conformation ; Oligoribonucleotides/chemistry/metabolism ; RNA/metabolism ; RNA, Catalytic/chemistry/*metabolism
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  • 9
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    Structure of the FKBP12-rapamycin complex interacting with the binding domain of human FRAP (1996)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1996-07-12
    Description: Rapamycin, a potent immunosuppressive agent, binds two proteins: the FK506-binding protein (FKBP12) and the FKBP-rapamycin-associated protein (FRAP). A crystal structure of the ternary complex of human FKBP12, rapamycin, and the FKBP12-rapamycin-binding (FRB) domain of human FRAP at a resolution of 2.7 angstroms revealed the two proteins bound together as a result of the ability of rapamycin to occupy two different hydrophobic binding pockets simultaneously. The structure shows extensive interactions between rapamycin and both proteins, but fewer interactions between the proteins. The structure of the FRB domain of FRAP clarifies both rapamycin-independent and -dependent effects observed for mutants of FRAP and its homologs in the family of proteins related to the ataxia-telangiectasia mutant gene product, and it illustrates how a small cell-permeable molecule can mediate protein dimerization.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Choi, J -- Chen, J -- Schreiber, S L -- Clardy, J -- CA59021/CA/NCI NIH HHS/ -- GM38625/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 1996 Jul 12;273(5272):239-42.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Chemistry, Baker Laboratory, Cornell University, Ithaca, NY 14853-1301, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/8662507" target="_blank"〉PubMed〈/a〉
    Keywords: Binding Sites ; Carrier Proteins/chemistry/genetics/*metabolism ; Crystallography, X-Ray ; DNA-Binding Proteins/chemistry/*metabolism ; Heat-Shock Proteins/chemistry/*metabolism ; Humans ; *Immunophilins ; Models, Molecular ; Mutation ; *Phosphotransferases (Alcohol Group Acceptor) ; Polyenes/*chemistry/*metabolism ; *Protein Conformation ; Protein Structure, Secondary ; Protein Structure, Tertiary ; Recombinant Proteins/chemistry/metabolism ; Sirolimus ; TOR Serine-Threonine Kinases ; Tacrolimus Binding Proteins
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  • 10
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    A mechanism of drug action revealed by structural studies of enoyl reductase (1996)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1996-12-20
    Description: Enoyl reductase (ENR), an enzyme involved in fatty acid biosynthesis, is the target for antibacterial diazaborines and the front-line antituberculosis drug isoniazid. Analysis of the structures of complexes of Escherichia coli ENR with nicotinamide adenine dinucleotide and either thienodiazaborine or benzodiazaborine revealed the formation of a covalent bond between the 2' hydroxyl of the nicotinamide ribose and a boron atom in the drugs to generate a tight, noncovalently bound bisubstrate analog. This analysis has implications for the structure-based design of inhibitors of ENR, and similarities to other oxidoreductases suggest that mimicking this molecular linkage may have generic applications in other areas of medicinal chemistry.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Baldock, C -- Rafferty, J B -- Sedelnikova, S E -- Baker, P J -- Stuitje, A R -- Slabas, A R -- Hawkes, T R -- Rice, D W -- New York, N.Y. -- Science. 1996 Dec 20;274(5295):2107-10.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Krebs Institute for Biomolecular Research, Department of Molecular Biology and Biotechnology, University of Sheffield, Sheffield S10 2TN, UK. D.Rice@sheffield.ac.uk〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/8953047" target="_blank"〉PubMed〈/a〉
    Keywords: Anti-Bacterial Agents/*metabolism/pharmacology ; Binding Sites ; Boron Compounds/*metabolism/pharmacology ; Crystallography, X-Ray ; Drug Design ; Drug Resistance, Microbial ; Enoyl-(Acyl-Carrier-Protein) Reductase (NADH) ; Enzyme Inhibitors/*metabolism/pharmacology ; Escherichia coli/enzymology ; Escherichia coli Proteins ; Fatty Acid Synthase, Type II ; Fatty Acid Synthases/antagonists & inhibitors/*chemistry/metabolism ; Hydrogen Bonding ; Models, Molecular ; NAD/*metabolism ; Oxidoreductases/antagonists & inhibitors/*chemistry/metabolism ; Protein Conformation ; Protein Structure, Secondary
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    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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