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  • Articles  (179)
  • Crystallography, X-Ray  (179)
  • American Association for the Advancement of Science (AAAS)  (179)
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  • Articles  (179)
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  • American Association for the Advancement of Science (AAAS)  (179)
  • American Association for the Advancement of Science
  • American Geophysical Union
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  • American Physical Society (APS)
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  • 2010-2014  (81)
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  • 11
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    Structural biology. A marvellous machine for making messages (2001)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2001-06-09
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Klug, A -- New York, N.Y. -- Science. 2001 Jun 8;292(5523):1844-6.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉MRC Laboratory of Molecular Biology, Cambridge CB2 2QH, UK.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/11397933" target="_blank"〉PubMed〈/a〉
    Keywords: Binding Sites ; Crystallization ; Crystallography, X-Ray ; DNA, Fungal/chemistry/metabolism ; Gene Expression Regulation, Fungal ; Promoter Regions, Genetic ; Protein Conformation ; Protein Folding ; Protein Structure, Quaternary ; Protein Structure, Secondary ; Protein Structure, Tertiary ; Protein Subunits ; RNA Polymerase II/*chemistry/*metabolism ; RNA, Fungal/biosynthesis/chemistry/metabolism ; RNA, Messenger/biosynthesis/chemistry/metabolism ; Saccharomyces cerevisiae/*enzymology/genetics ; Transcription Factors/isolation & purification/metabolism ; *Transcription, Genetic
    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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  • 12
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    Structural biology. Controlling the caspases (2001)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2001-11-17
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Fesik, S W -- Shi, Y -- New York, N.Y. -- Science. 2001 Nov 16;294(5546):1477-8.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Cancer Research, Global Pharmaceutical Research & Development, Abbott Laboratories, Abbott Park, IL 60064, USA. stephen.fesik@abbott.com〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/11711663" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Motifs ; Animals ; *Apoptosis ; Binding Sites ; Carrier Proteins/*chemistry/*metabolism ; *Caspase Inhibitors ; Caspases/chemistry/*metabolism ; Crystallography, X-Ray ; Cysteine Proteinase Inhibitors/chemistry/metabolism ; Dimerization ; Humans ; Hydrogen Bonding ; Intracellular Signaling Peptides and Proteins ; Mitochondria/metabolism ; Mitochondrial Proteins/*chemistry/*metabolism ; Protein Structure, Secondary ; Protein Structure, Tertiary ; Proteins/*chemistry/*metabolism ; X-Linked Inhibitor of Apoptosis Protein
    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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  • 13
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    Crystal structure of the free radical intermediate of pyruvate:ferredoxin oxidoreductase (2001)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2001-12-26
    Description: In anaerobic organisms, the decarboxylation of pyruvate, a crucial component of intermediary metabolism, is catalyzed by the metalloenzyme pyruvate: ferredoxin oxidoreductase (PFOR) resulting in the generation of low potential electrons and the subsequent acetylation of coenzyme A (CoA). PFOR is the only enzyme for which a stable acetyl thiamine diphosphate (ThDP)-based free radical reaction intermediate has been identified. The 1.87 A-resolution structure of the radical form of PFOR from Desulfovibrio africanus shows that, despite currently accepted ideas, the thiazole ring of the ThDP cofactor is markedly bent, indicating a drastic reduction of its aromaticity. In addition, the bond connecting the acetyl group to ThDP is unusually long, probably of the one-electron type already described for several cation radicals but not yet found in a biological system. Taken together, our data, along with evidence from the literature, suggest that acetyl-CoA synthesis by PFOR proceeds via a condensation mechanism involving acetyl (PFOR-based) and thiyl (CoA-based) radicals.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Chabriere, E -- Vernede, X -- Guigliarelli, B -- Charon, M H -- Hatchikian, E C -- Fontecilla-Camps, J C -- New York, N.Y. -- Science. 2001 Dec 21;294(5551):2559-63.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Laboratoire de Cristallographie et Cristallogenese des Proteines, Institut de Biologie Structurale Jean-Pierre Ebel, Commissariat a l'Energie Atomique, Universite Joseph Fourier, CNRS, 41, rue Jules Horowitz, 38027 Grenoble Cedex 1, France.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/11752578" target="_blank"〉PubMed〈/a〉
    Keywords: Acetyl Coenzyme A/metabolism ; Anaerobiosis ; Binding Sites ; Carbon Dioxide/metabolism ; Catalysis ; Chemistry, Physical ; Coenzymes/*chemistry/metabolism ; Crystallization ; Crystallography, X-Ray ; Desulfovibrio/*enzymology ; Dimerization ; Electron Spin Resonance Spectroscopy ; *Free Radicals/chemistry/metabolism ; Ketone Oxidoreductases/*chemistry/metabolism ; Molecular Conformation ; Molecular Structure ; Oxidation-Reduction ; Physicochemical Phenomena ; Protein Conformation ; Pyruvate Synthase ; Pyruvic Acid/metabolism ; Thiamine Pyrophosphate/*chemistry/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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  • 14
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    Crystal structure of Arp2/3 complex (2001)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2001-11-27
    Description: We determined a crystal structure of bovine Arp2/3 complex, an assembly of seven proteins that initiates actin polymerization in eukaryotic cells, at 2.0 angstrom resolution. Actin-related protein 2 (Arp2) and Arp3 are folded like actin, with distinctive surface features. Subunits ARPC2 p34 and ARPC4 p20 in the core of the complex associate through long carboxyl-terminal alpha helices and have similarly folded amino-terminal alpha/beta domains. ARPC1 p40 is a seven-blade beta propeller with an insertion that may associate with the side of an actin filament. ARPC3 p21 and ARPC5 p16 are globular alpha-helical subunits. We predict that WASp/Scar proteins activate Arp2/3 complex by bringing Arp2 into proximity with Arp3 for nucleation of a branch on the side of a preexisting actin filament.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Robinson, R C -- Turbedsky, K -- Kaiser, D A -- Marchand, J B -- Higgs, H N -- Choe, S -- Pollard, T D -- GM-26132/GM/NIGMS NIH HHS/ -- GM-26338/GM/NIGMS NIH HHS/ -- GM-56653/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 2001 Nov 23;294(5547):1679-84.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Structural Biology Laboratory, Salk Institute for Biological Studies, 10010 North Torrey Pines Road, La Jolla, CA 92037, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/11721045" target="_blank"〉PubMed〈/a〉
    Keywords: Actin Cytoskeleton/*chemistry/*metabolism ; Actin-Related Protein 2 ; Actin-Related Protein 3 ; Actins/*chemistry/*metabolism ; Adenosine Triphosphate/metabolism ; Animals ; Cattle ; Crystallography, X-Ray ; *Cytoskeletal Proteins ; Macromolecular Substances ; Models, Biological ; Models, Molecular ; Muscle, Skeletal ; Protein Structure, Quaternary ; Protein Structure, Secondary ; Protein Structure, Tertiary ; Protein Subunits ; Static Electricity ; Thymus Gland
    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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  • 15
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    Structure of MsbA from E. coli: a homolog of the multidrug resistance ATP binding cassette (ABC) transporters (2001)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2001-09-08
    Description: Multidrug resistance (MDR) is a serious medical problem and presents a major challenge to the treatment of disease and the development of novel therapeutics. ABC transporters that are associated with multidrug resistance (MDR-ABC transporters) translocate hydrophobic drugs and lipids from the inner to the outer leaflet of the cell membrane. To better elucidate the structural basis for the "flip-flop" mechanism of substrate movement across the lipid bilayer, we have determined the structure of the lipid flippase MsbA from Escherichia coli by x-ray crystallography to a resolution of 4.5 angstroms. MsbA is organized as a homodimer with each subunit containing six transmembrane alpha-helices and a nucleotide-binding domain. The asymmetric distribution of charged residues lining a central chamber suggests a general mechanism for the translocation of substrate by MsbA and other MDR-ABC transporters. The structure of MsbA can serve as a model for the MDR-ABC transporters that confer multidrug resistance to cancer cells and infectious microorganisms.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Chang, G -- Roth, C B -- GM61905-01/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 2001 Sep 7;293(5536):1793-800.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Molecular Biology, MB-9, The Scripps Research Institute, La Jolla, CA 92037, USA. gchang@scripps.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/11546864" target="_blank"〉PubMed〈/a〉
    Keywords: *ATP-Binding Cassette Transporters ; Adenosine Triphosphate/metabolism ; Amino Acid Sequence ; Bacterial Proteins/*chemistry/genetics/metabolism ; Binding Sites ; Biological Transport ; Crystallography, X-Ray ; Dimerization ; *Drug Resistance, Microbial ; *Drug Resistance, Multiple ; Escherichia coli/*enzymology ; Lipid A/metabolism ; Membrane Proteins/*chemistry/genetics/metabolism ; Models, Molecular ; Molecular Sequence Data ; Protein Structure, Secondary ; Protein Structure, Tertiary ; Sequence Alignment ; Static Electricity ; Structure-Activity Relationship
    Print ISSN: 0036-8075
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  • 16
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    Synchrotron radiation. Swiss source shows small is powerful (2001)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2001-10-20
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Weiss, G -- New York, N.Y. -- Science. 2001 Oct 19;294(5542):494.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/11641472" target="_blank"〉PubMed〈/a〉
    Keywords: Costs and Cost Analysis ; Crystallography, X-Ray ; Gene Expression ; Genetic Techniques ; Nucleosomes ; Switzerland ; *Synchrotrons/economics ; X-Rays
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
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  • 17
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    Recognition of cognate transfer RNA by the 30S ribosomal subunit (2001)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2001-05-08
    Description: Crystal structures of the 30S ribosomal subunit in complex with messenger RNA and cognate transfer RNA in the A site, both in the presence and absence of the antibiotic paromomycin, have been solved at between 3.1 and 3.3 angstroms resolution. Cognate transfer RNA (tRNA) binding induces global domain movements of the 30S subunit and changes in the conformation of the universally conserved and essential bases A1492, A1493, and G530 of 16S RNA. These bases interact intimately with the minor groove of the first two base pairs between the codon and anticodon, thus sensing Watson-Crick base-pairing geometry and discriminating against near-cognate tRNA. The third, or "wobble," position of the codon is free to accommodate certain noncanonical base pairs. By partially inducing these structural changes, paromomycin facilitates binding of near-cognate tRNAs.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Ogle, J M -- Brodersen, D E -- Clemons , W M Jr -- Tarry, M J -- Carter, A P -- Ramakrishnan, V -- F31 GM019384/GM/NIGMS NIH HHS/ -- GM 44973/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 2001 May 4;292(5518):897-902.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉MRC Laboratory of Molecular Biology, Hills Road, Cambridge CB2 2QH, UK.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/11340196" target="_blank"〉PubMed〈/a〉
    Keywords: Anti-Bacterial Agents/metabolism/pharmacology ; Anticodon/chemistry/metabolism ; Base Pairing ; Binding Sites ; Codon/chemistry/metabolism ; Crystallography, X-Ray ; Guanosine Triphosphate/metabolism ; Hydrogen Bonding ; Models, Molecular ; Nucleic Acid Conformation ; Paromomycin/metabolism/pharmacology ; Peptide Chain Elongation, Translational ; Peptide Elongation Factor Tu/metabolism ; Protein Biosynthesis ; RNA, Bacterial/chemistry/metabolism ; RNA, Messenger/chemistry/*metabolism ; RNA, Ribosomal, 16S/chemistry/*metabolism ; RNA, Transfer/chemistry/*metabolism ; RNA, Transfer, Amino Acid-Specific/chemistry/*metabolism ; RNA, Transfer, Phe/chemistry/metabolism ; Ribosomes/chemistry/*metabolism/ultrastructure ; Thermodynamics ; Thermus thermophilus/chemistry/metabolism/*ultrastructure
    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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  • 18
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    Antibody catalysis of the oxidation of water (2001)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2001-09-08
    Description: Recently we reported that antibodies can generate hydrogen peroxide (H2O2) from singlet molecular oxygen (1O2*). We now show that this process is catalytic, and we identify the electron source for a quasi-unlimited generation of H2O2. Antibodies produce up to 500 mole equivalents of H2O2 from 1O2*, without a reduction in rate, and we have excluded metals or Cl- as the electron source. On the basis of isotope incorporation experiments and kinetic data, we propose that antibodies use H2O as an electron source, facilitating its addition to 1O2* to form H2O3 as the first intermediate in a reaction cascade that eventually leads to H2O2. X-ray crystallographic studies with xenon point to putative conserved oxygen binding sites within the antibody fold where this chemistry could be initiated. Our findings suggest a protective function of immunoglobulins against 1O2* and raise the question of whether the need to detoxify 1O2* has played a decisive role in the evolution of the immunoglobulin fold.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Wentworth , P Jr -- Jones, L H -- Wentworth, A D -- Zhu, X -- Larsen, N A -- Wilson, I A -- Xu, X -- Goddard , W A 3rd -- Janda, K D -- Eschenmoser, A -- Lerner, R A -- CA27489/CA/NCI NIH HHS/ -- GM43858/GM/NIGMS NIH HHS/ -- HD 36385/HD/NICHD NIH HHS/ -- New York, N.Y. -- Science. 2001 Sep 7;293(5536):1806-11.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Chemistry, Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, CA 92037, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/11546867" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Antibodies, Catalytic/chemistry/*metabolism ; Binding Sites ; Catalysis ; Conserved Sequence ; Crystallography, X-Ray ; Humans ; Hydrogen Peroxide/*metabolism ; Kinetics ; Models, Molecular ; Oxidants/chemistry/*metabolism ; Oxidation-Reduction ; Oxygen/*metabolism ; Protein Conformation ; Singlet Oxygen ; Spectrometry, Mass, Electrospray Ionization ; Thermodynamics ; Tryptophan/metabolism ; Ultraviolet Rays ; Water/*chemistry/*metabolism ; Xenon/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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  • 19
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    Global efforts in structural genomics (2001)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2001-10-06
    Description: A worldwide initiative in structural genomics aims to capitalize on the recent successes of the genome projects. Substantial new investments in structural genomics in the past 2 years indicate the high level of support for these international efforts. Already, enormous progress has been made on high-throughput methodologies and technologies that will speed up macromolecular structure determinations. Recent international meetings have resulted in the formation of an International Structural Genomics Organization to formulate policy and foster cooperation between the public and private efforts.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Stevens, R C -- Yokoyama, S -- Wilson, I A -- P50 GM62411/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 2001 Oct 5;294(5540):89-92.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Joint Center for Structural Genomics, Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, CA 92037, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/11588249" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; *Computational Biology ; Congresses as Topic ; Costs and Cost Analysis ; Crystallography, X-Ray ; Databases, Factual ; *Genomics ; Guidelines as Topic ; Humans ; Information Management ; Information Services ; International Cooperation ; Internet ; Nuclear Magnetic Resonance, Biomolecular ; Patents as Topic ; Private Sector ; *Protein Conformation ; Protein Folding ; Proteins/*chemistry ; *Proteome ; Public Sector ; Publishing ; Technology Transfer
    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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  • 20
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    Structure. An anthropomorphic integrin (2001)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2001-10-13
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Humphries, M J -- Mould, A P -- New York, N.Y. -- Science. 2001 Oct 12;294(5541):316-7.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Wellcome Trust Centre for Cell-Matrix Research, School of Biological Sciences, University of Manchester, M13 9PT, UK. martin.humphries@man.ac.uk〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/11598288" target="_blank"〉PubMed〈/a〉
    Keywords: Binding Sites ; Calcium/metabolism ; Crystallization ; Crystallography, X-Ray ; Dimerization ; Drug Design ; Humans ; Ligands ; Metals/metabolism ; Models, Molecular ; Protein Binding ; Protein Conformation ; Protein Folding ; Protein Structure, Quaternary ; Protein Structure, Secondary ; Protein Structure, Tertiary ; Protein Subunits ; Receptors, Vitronectin/*chemistry/metabolism
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