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  • Articles  (162)
  • Binding Sites  (126)
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  • 1
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    Identification of functional elements and regulatory circuits by Drosophila modENCODE (2010)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2010-12-24
    Description: To gain insight into how genomic information is translated into cellular and developmental programs, the Drosophila model organism Encyclopedia of DNA Elements (modENCODE) project is comprehensively mapping transcripts, histone modifications, chromosomal proteins, transcription factors, replication proteins and intermediates, and nucleosome properties across a developmental time course and in multiple cell lines. We have generated more than 700 data sets and discovered protein-coding, noncoding, RNA regulatory, replication, and chromatin elements, more than tripling the annotated portion of the Drosophila genome. Correlated activity patterns of these elements reveal a functional regulatory network, which predicts putative new functions for genes, reveals stage- and tissue-specific regulators, and enables gene-expression prediction. Our results provide a foundation for directed experimental and computational studies in Drosophila and related species and also a model for systematic data integration toward comprehensive genomic and functional annotation.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3192495/" 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/PMC3192495/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉modENCODE Consortium -- Roy, Sushmita -- Ernst, Jason -- Kharchenko, Peter V -- Kheradpour, Pouya -- Negre, Nicolas -- Eaton, Matthew L -- Landolin, Jane M -- Bristow, Christopher A -- Ma, Lijia -- Lin, Michael F -- Washietl, Stefan -- Arshinoff, Bradley I -- Ay, Ferhat -- Meyer, Patrick E -- Robine, Nicolas -- Washington, Nicole L -- Di Stefano, Luisa -- Berezikov, Eugene -- Brown, Christopher D -- Candeias, Rogerio -- Carlson, Joseph W -- Carr, Adrian -- Jungreis, Irwin -- Marbach, Daniel -- Sealfon, Rachel -- Tolstorukov, Michael Y -- Will, Sebastian -- Alekseyenko, Artyom A -- Artieri, Carlo -- Booth, Benjamin W -- Brooks, Angela N -- Dai, Qi -- Davis, Carrie A -- Duff, Michael O -- Feng, Xin -- Gorchakov, Andrey A -- Gu, Tingting -- Henikoff, Jorja G -- Kapranov, Philipp -- Li, Renhua -- MacAlpine, Heather K -- Malone, John -- Minoda, Aki -- Nordman, Jared -- Okamura, Katsutomo -- Perry, Marc -- Powell, Sara K -- Riddle, Nicole C -- Sakai, Akiko -- Samsonova, Anastasia -- Sandler, Jeremy E -- Schwartz, Yuri B -- Sher, Noa -- Spokony, Rebecca -- Sturgill, David -- van Baren, Marijke -- Wan, Kenneth H -- Yang, Li -- Yu, Charles -- Feingold, Elise -- Good, Peter -- Guyer, Mark -- Lowdon, Rebecca -- Ahmad, Kami -- Andrews, Justen -- Berger, Bonnie -- Brenner, Steven E -- Brent, Michael R -- Cherbas, Lucy -- Elgin, Sarah C R -- Gingeras, Thomas R -- Grossman, Robert -- Hoskins, Roger A -- Kaufman, Thomas C -- Kent, William -- Kuroda, Mitzi I -- Orr-Weaver, Terry -- Perrimon, Norbert -- Pirrotta, Vincenzo -- Posakony, James W -- Ren, Bing -- Russell, Steven -- Cherbas, Peter -- Graveley, Brenton R -- Lewis, Suzanna -- Micklem, Gos -- Oliver, Brian -- Park, Peter J -- Celniker, Susan E -- Henikoff, Steven -- Karpen, Gary H -- Lai, Eric C -- MacAlpine, David M -- Stein, Lincoln D -- White, Kevin P -- Kellis, Manolis -- R01 HG004037/HG/NHGRI NIH HHS/ -- R01HG004037/HG/NHGRI NIH HHS/ -- RC2HG005639/HG/NHGRI NIH HHS/ -- U01 HG004258/HG/NHGRI NIH HHS/ -- U01 HG004271/HG/NHGRI NIH HHS/ -- U01 HG004279/HG/NHGRI NIH HHS/ -- U01HG004258/HG/NHGRI NIH HHS/ -- U01HG004261/HG/NHGRI NIH HHS/ -- U01HG004264/HG/NHGRI NIH HHS/ -- U01HG004271/HG/NHGRI NIH HHS/ -- U01HG004274/HG/NHGRI NIH HHS/ -- U01HG004279/HG/NHGRI NIH HHS/ -- U41HG004269/HG/NHGRI NIH HHS/ -- ZIA DK015600-14/Intramural NIH HHS/ -- Howard Hughes Medical Institute/ -- New York, N.Y. -- Science. 2010 Dec 24;330(6012):1787-97. doi: 10.1126/science.1198374. Epub 2010 Dec 22.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Computer Science and Artificial Intelligence Laboratory, Massachusetts Institute of Technology (MIT), Cambridge, MA 02139, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/21177974" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Binding Sites ; *Chromatin/genetics/metabolism ; Computational Biology/methods ; Drosophila Proteins/genetics/metabolism ; Drosophila melanogaster/*genetics/growth & development/metabolism ; Epigenesis, Genetic ; Gene Expression Regulation ; *Gene Regulatory Networks ; Genes, Insect ; *Genome, Insect ; Genomics/methods ; Histones/metabolism ; *Molecular Sequence Annotation ; Nucleosomes/genetics/metabolism ; Promoter Regions, Genetic ; RNA, Small Untranslated/genetics/metabolism ; Transcription Factors/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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  • 2
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    Allosteric control of RNA polymerase by a site that contacts nascent RNA hairpins (2001)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2001-04-28
    Description: DNA, RNA, and regulatory molecules control gene expression through interactions with RNA polymerase (RNAP). We show that a short alpha helix at the tip of the flaplike domain that covers the RNA exit channel of RNAP contacts a nascent RNA stem-loop structure (hairpin) that inhibits transcription, and that this flap-tip helix is required for activity of the regulatory protein NusA. Protein-RNA cross-linking, molecular modeling, and effects of alterations in RNAP and RNA all suggest that a tripartite interaction of RNAP, NusA, and the hairpin inhibits nucleotide addition in the active site, which is located 65 angstroms away. These findings favor an allosteric model for regulation of transcript elongation.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Toulokhonov, I -- Artsimovitch, I -- Landick, R -- GM38660/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 2001 Apr 27;292(5517):730-3.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Bacteriology, University of Wisconsin, Madison, WI 53706, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/11326100" target="_blank"〉PubMed〈/a〉
    Keywords: Allosteric Regulation ; Amino Acid Sequence ; Bacterial Proteins/metabolism ; Base Sequence ; Binding Sites ; Catalysis ; DNA-Directed RNA Polymerases/*chemistry/genetics/*metabolism ; Escherichia coli/genetics ; Escherichia coli Proteins ; Models, Molecular ; Molecular Sequence Data ; Mutation ; *Nucleic Acid Conformation ; Oligonucleotides, Antisense ; *Peptide Elongation Factors ; Protein Conformation ; Protein Structure, Secondary ; Protein Structure, Tertiary ; RNA/*chemistry/metabolism ; Transcription Factors/metabolism ; Transcription, Genetic ; Transcriptional Elongation Factors
    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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  • 3
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    Three-dimensional structure of the Tn5 synaptic complex transposition intermediate (2000)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2000-07-07
    Description: Genomic evolution has been profoundly influenced by DNA transposition, a process whereby defined DNA segments move freely about the genome. Transposition is mediated by transposases, and similar events are catalyzed by retroviral integrases such as human immunodeficiency virus-1 (HIV-1) integrase. Understanding how these proteins interact with DNA is central to understanding the molecular basis of transposition. We report the three-dimensional structure of prokaryotic Tn5 transposase complexed with Tn5 transposon end DNA determined to 2.3 angstrom resolution. The molecular assembly is dimeric, where each double-stranded DNA molecule is bound by both protein subunits, orienting the transposon ends into the active sites. This structure provides a molecular framework for understanding many aspects of transposition, including the binding of transposon end DNA by one subunit and cleavage by a second, cleavage of two strands of DNA by a single active site via a hairpin intermediate, and strand transfer into target DNA.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Davies, D R -- Goryshin, I Y -- Reznikoff, W S -- Rayment, I -- AR35186/AR/NIAMS NIH HHS/ -- GM50692/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 2000 Jul 7;289(5476):77-85.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Biochemistry, University of Wisconsin, Madison, WI 53706, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/10884228" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Motifs ; Binding Sites ; Catalysis ; Catalytic Domain ; Crystallization ; Crystallography, X-Ray ; DNA/*chemistry/*metabolism ; *DNA Transposable Elements ; Dimerization ; Manganese/metabolism ; Mutation ; Nucleic Acid Conformation ; Plasmids ; Protein Binding ; Protein Conformation ; Protein Folding ; Protein Structure, Secondary ; Protein Structure, Tertiary ; Transposases/*chemistry/genetics/*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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    Repression of the insulin-like growth factor II gene by the Wilms tumor suppressor WT1 (1992)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1992-07-31
    Description: The Wilms tumor suppressor gene wt1 encodes a zinc finger DNA binding protein, WT1, that functions as a transcriptional repressor. The fetal mitogen insulin-like growth factor II (IGF-II) is overexpressed in Wilms tumors and may have autocrine effects in tumor progression. The major fetal IGF-II promoter was defined in transient transfection assays as a region spanning from nucleotides -295 to +135, relative to the transcription start site. WT1 bound to multiple sites in this region and functioned as a potent repressor of IGF-II transcription in vivo. Maximal repression was dependent on the presence of WT1 binding sites on each side of the transcriptional initiation site. These findings provide a molecular basis for overexpression of IGF-II in Wilms tumors and suggest that WT1 negatively regulates blastemal cell proliferation by limiting the production of a fetal growth factor in the developing vertebrate kidney.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Drummond, I A -- Madden, S L -- Rohwer-Nutter, P -- Bell, G I -- Sukhatme, V P -- Rauscher, F J 3rd -- CA 10817/CA/NCI NIH HHS/ -- CA 47983/CA/NCI NIH HHS/ -- CA 52009/CA/NCI NIH HHS/ -- New York, N.Y. -- Science. 1992 Jul 31;257(5070):674-8.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Howard Hughes Medical Institute, University of Chicago, IL 60637.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/1323141" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Base Sequence ; Binding Sites ; Blotting, Northern ; DNA/chemistry/metabolism ; DNA-Binding Proteins/*metabolism ; Deoxyribonuclease I/metabolism ; *Gene Expression Regulation, Neoplastic ; Genes, Wilms Tumor/*physiology ; Humans ; Insulin-Like Growth Factor II/*genetics ; Kidney/embryology/metabolism ; Mice ; Molecular Sequence Data ; Promoter Regions, Genetic ; Rats ; Sequence Homology, Nucleic Acid ; Transfection ; WT1 Proteins ; Wilms Tumor/genetics/metabolism ; Zinc Fingers
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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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    Mechanism of Na+/H+ antiporting (2007)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2007-08-11
    Description: Na+/H+ antiporters are central to cellular salt and pH homeostasis. The structure of Escherichia coli NhaA was recently determined, but its mechanisms of transport and pH regulation remain elusive. We performed molecular dynamics simulations of NhaA that, with existing experimental data, enabled us to propose an atomically detailed model of antiporter function. Three conserved aspartates are key to our proposed mechanism: Asp164 (D164) is the Na+-binding site, D163 controls the alternating accessibility of this binding site to the cytoplasm or periplasm, and D133 is crucial for pH regulation. Consistent with experimental stoichiometry, two protons are required to transport a single Na+ ion: D163 protonates to reveal the Na+-binding site to the periplasm, and subsequent protonation of D164 releases Na+. Additional mutagenesis experiments further validated the model.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Arkin, Isaiah T -- Xu, Huafeng -- Jensen, Morten O -- Arbely, Eyal -- Bennett, Estelle R -- Bowers, Kevin J -- Chow, Edmond -- Dror, Ron O -- Eastwood, Michael P -- Flitman-Tene, Ravenna -- Gregersen, Brent A -- Klepeis, John L -- Kolossvary, Istvan -- Shan, Yibing -- Shaw, David E -- New York, N.Y. -- Science. 2007 Aug 10;317(5839):799-803.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉D. E. Shaw Research, New York, NY 10036, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17690293" target="_blank"〉PubMed〈/a〉
    Keywords: Aspartic Acid/metabolism ; Binding Sites ; Computer Simulation ; Crystallization ; Cytoplasm/metabolism ; Escherichia coli/growth & development/*metabolism ; Escherichia coli Proteins/*chemistry/*metabolism ; Hydrogen Bonding ; Hydrogen-Ion Concentration ; Ion Transport ; *Models, Biological ; Models, Molecular ; Mutagenesis ; Periplasm/metabolism ; Protein Conformation ; Protein Structure, Secondary ; *Protons ; Sodium/*metabolism ; Sodium-Hydrogen Antiporter/*chemistry/*metabolism
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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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    Cardiac myosin activation: a potential therapeutic approach for systolic heart failure (2011)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2011-03-19
    Description: Decreased cardiac contractility is a central feature of systolic heart failure. Existing drugs increase cardiac contractility indirectly through signaling cascades but are limited by their mechanism-related adverse effects. To avoid these limitations, we previously developed omecamtiv mecarbil, a small-molecule, direct activator of cardiac myosin. Here, we show that it binds to the myosin catalytic domain and operates by an allosteric mechanism to increase the transition rate of myosin into the strongly actin-bound force-generating state. Paradoxically, it inhibits adenosine 5'-triphosphate turnover in the absence of actin, which suggests that it stabilizes an actin-bound conformation of myosin. In animal models, omecamtiv mecarbil increases cardiac function by increasing the duration of ejection without changing the rates of contraction. Cardiac myosin activation may provide a new therapeutic approach for systolic heart failure.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4090309/" 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/PMC4090309/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Malik, Fady I -- Hartman, James J -- Elias, Kathleen A -- Morgan, Bradley P -- Rodriguez, Hector -- Brejc, Katjusa -- Anderson, Robert L -- Sueoka, Sandra H -- Lee, Kenneth H -- Finer, Jeffrey T -- Sakowicz, Roman -- Baliga, Ramesh -- Cox, David R -- Garard, Marc -- Godinez, Guillermo -- Kawas, Raja -- Kraynack, Erica -- Lenzi, David -- Lu, Pu Ping -- Muci, Alexander -- Niu, Congrong -- Qian, Xiangping -- Pierce, Daniel W -- Pokrovskii, Maria -- Suehiro, Ion -- Sylvester, Sheila -- Tochimoto, Todd -- Valdez, Corey -- Wang, Wenyue -- Katori, Tatsuo -- Kass, David A -- Shen, You-Tang -- Vatner, Stephen F -- Morgans, David J -- 1-R43-HL-66647-1/HL/NHLBI NIH HHS/ -- R01 HL106511/HL/NHLBI NIH HHS/ -- R43 HL066647/HL/NHLBI NIH HHS/ -- New York, N.Y. -- Science. 2011 Mar 18;331(6023):1439-43. doi: 10.1126/science.1200113.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Preclinical Research and Development, Cytokinetics, Inc., South San Francisco, CA 94080, USA. fmalik@cytokinetics.com〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/21415352" target="_blank"〉PubMed〈/a〉
    Keywords: Actin Cytoskeleton/metabolism ; Actins/metabolism ; Adenosine Triphosphatases/metabolism ; Adenosine Triphosphate/metabolism ; Adrenergic beta-Agonists/pharmacology ; Allosteric Regulation ; Animals ; Binding Sites ; Calcium/metabolism ; Cardiac Myosins/chemistry/*metabolism ; Cardiac Output/drug effects ; Dogs ; Female ; Heart Failure, Systolic/*drug therapy/physiopathology ; Isoproterenol/pharmacology ; Male ; Myocardial Contraction/*drug effects ; Myocytes, Cardiac/*drug effects/physiology ; Phosphates/metabolism ; Protein Binding ; Protein Conformation ; Protein Isoforms/chemistry/metabolism ; Rats ; Rats, Sprague-Dawley ; Urea/*analogs & derivatives/chemistry/metabolism/pharmacology ; Ventricular Function, Left/drug effects
    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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  • 7
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    Functional adaptation of BabA, the H. pylori ABO blood group antigen binding adhesin (2004)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2004-07-27
    Description: Adherence by Helicobacter pylori increases the risk of gastric disease. Here, we report that more than 95% of strains that bind fucosylated blood group antigen bind A, B, and O antigens (generalists), whereas 60% of adherent South American Amerindian strains bind blood group O antigens best (specialists). This specialization coincides with the unique predominance of blood group O in these Amerindians. Strains differed about 1500-fold in binding affinities, and diversifying selection was evident in babA sequences. We propose that cycles of selection for increased and decreased bacterial adherence contribute to babA diversity and that these cycles have led to gradual replacement of generalist binding by specialist binding in blood group O-dominant human populations.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Aspholm-Hurtig, Marina -- Dailide, Giedrius -- Lahmann, Martina -- Kalia, Awdhesh -- Ilver, Dag -- Roche, Niamh -- Vikstrom, Susanne -- Sjostrom, Rolf -- Linden, Sara -- Backstrom, Anna -- Lundberg, Carina -- Arnqvist, Anna -- Mahdavi, Jafar -- Nilsson, Ulf J -- Velapatino, Billie -- Gilman, Robert H -- Gerhard, Markus -- Alarcon, Teresa -- Lopez-Brea, Manuel -- Nakazawa, Teruko -- Fox, James G -- Correa, Pelayo -- Dominguez-Bello, Maria Gloria -- Perez-Perez, Guillermo I -- Blaser, Martin J -- Normark, Staffan -- Carlstedt, Ingemar -- Oscarson, Stefan -- Teneberg, Susann -- Berg, Douglas E -- Boren, Thomas -- P30 DK52574/DK/NIDDK NIH HHS/ -- R01 AI38166/AI/NIAID NIH HHS/ -- R01 DK53727/DK/NIDDK NIH HHS/ -- R01 DK63041/DK/NIDDK NIH HHS/ -- R03 AI49161/AI/NIAID NIH HHS/ -- R0IGM62370/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 2004 Jul 23;305(5683):519-22.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Odontology, section of Oral Microbiology, Umea University, SE-901 87 Umea, Sweden.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/15273394" target="_blank"〉PubMed〈/a〉
    Keywords: ABO Blood-Group System/*metabolism ; Adaptation, Biological ; Adhesins, Bacterial/chemistry/*genetics/immunology/*metabolism ; Alleles ; *Bacterial Adhesion ; Base Sequence ; Binding Sites ; Evolution, Molecular ; Fucose/metabolism ; Gastric Mucosa/microbiology ; Helicobacter Infections/microbiology ; Helicobacter pylori/genetics/immunology/*physiology ; Humans ; Indians, South American ; Lewis Blood-Group System/metabolism ; Molecular Sequence Data ; Mutation ; Peru ; Phenotype ; Phylogeny ; Protein Binding ; Selection, Genetic ; Transformation, Bacterial
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  • 8
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    Side-on copper-nitrosyl coordination by nitrite reductase (2004)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2004-05-08
    Description: A copper-nitrosyl intermediate forms during the catalytic cycle of nitrite reductase, the enzyme that mediates the committed step in bacterial denitrification. The crystal structure of a type 2 copper-nitrosyl complex of nitrite reductase reveals an unprecedented side-on binding mode in which the nitrogen and oxygen atoms are nearly equidistant from the copper cofactor. Comparison of this structure with a refined nitrite-bound crystal structure explains how coordination can change between copper-oxygen and copper-nitrogen during catalysis. The side-on copper-nitrosyl in nitrite reductase expands the possibilities for nitric oxide interactions in copper proteins such as superoxide dismutase and prions.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Tocheva, Elitza I -- Rosell, Federico I -- Mauk, A Grant -- Murphy, Michael E P -- New York, N.Y. -- Science. 2004 May 7;304(5672):867-70.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Microbiology and Immunology, The University of British Columbia, Vancouver, BC, Canada V6T 1Z3.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/15131305" target="_blank"〉PubMed〈/a〉
    Keywords: Alcaligenes faecalis/enzymology ; Ascorbic Acid/metabolism ; Binding Sites ; Catalysis ; Copper/*metabolism ; Crystallization ; Crystallography, X-Ray ; Electron Spin Resonance Spectroscopy ; Hydrogen Bonding ; Models, Chemical ; Models, Molecular ; Nitric Oxide/*metabolism ; Nitrite Reductases/*chemistry/*metabolism ; Nitrites/*metabolism ; Oxidation-Reduction ; Oxygen/metabolism
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    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 9
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    Optical imaging of surface chemistry and dynamics in confinement (2017)
    American Association for the Advancement of Science (AAAS)
    In: Science
    Details
    Publication Date: 2017-08-25
    Description: We imaged the interfacial structure and dynamics of water in a microscopically confined geometry, in three dimensions and on millisecond time scales, with a structurally illuminated wide-field second harmonic microscope. The second harmonic images reported on the orientational order of interfacial water, induced by charge-dipole interactions between water molecules and surface charges. The images were converted into surface potential maps. Spatially resolved surface acid dissociation constant (p K a,s ) values were determined for the silica deprotonation reaction by following pH-induced chemical changes on the curved and confined surfaces of a glass microcapillary immersed in aqueous solutions. These values ranged from 2.3 to 10.7 along the wall of a single capillary because of surface heterogeneities. Water molecules that rotate along an oscillating external electric field were also imaged.
    Keywords: Chemistry
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    Topics: Biology , Chemistry and Pharmacology , Geosciences , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 10
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    The Prp19p-associated complex in spliceosome activation (2003)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2003-09-13
    Description: During spliceosome activation, a large structural rearrangement occurs that involves the release of two small nuclear RNAs, U1 and U4, and the addition of a protein complex associated with Prp19p. We show here that the Prp19p-associated complex is required for stable association of U5 and U6 with the spliceosome after U4 is dissociated. Ultraviolet crosslinking analysis revealed the existence of two modes of base pairing between U6 and the 5' splice site, as well as a switch of such base pairing from one to the other that required the Prp19p-associated complex during spliceosome activation. Moreover, a Prp19p-dependent structural change in U6 small nuclear ribonucleoprotein particles was detected that involves destabilization of Sm-like (Lsm) proteins to bring about interactions between the Lsm binding site of U6 and the intron sequence near the 5' splice site, indicating dynamic association of Lsm with U6 and a direct role of Lsm proteins in activation of the spliceosome.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Chan, Shih-Peng -- Kao, Der-I -- Tsai, Wei-Yu -- Cheng, Soo-Chen -- New York, N.Y. -- Science. 2003 Oct 10;302(5643):279-82. Epub 2003 Sep 11.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Institute of Microbiology and Immunology, National Yang-Ming University, Shih-Pai, Taiwan, Republic of China.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/12970570" target="_blank"〉PubMed〈/a〉
    Keywords: Adenosine Triphosphate/metabolism ; Base Pairing ; Binding Sites ; Blotting, Northern ; Introns ; Molecular Sequence Data ; RNA Precursors/metabolism ; RNA Splicing ; RNA, Small Nuclear/metabolism ; RNA-Binding Proteins/chemistry/metabolism ; Ribonuclease H/metabolism ; Ribonucleoprotein, U4-U6 Small Nuclear/chemistry/*metabolism ; Saccharomyces cerevisiae Proteins/*metabolism ; Spliceosomes/*metabolism
    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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