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  • Crystallography, X-Ray  (123)
  • Astronomy
  • Nature Publishing Group (NPG)  (126)
  • 2005-2009  (126)
  • 2000-2004
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  • 1
    Publication Date: 2009-12-22
    Description: Broken chromosomes arising from DNA double-strand breaks result from endogenous events such as the production of reactive oxygen species during cellular metabolism, as well as from exogenous sources such as ionizing radiation. Left unrepaired or incorrectly repaired they can lead to genomic changes that may result in cell death or cancer. DNA-dependent protein kinase (DNA-PK), a holoenzyme that comprises the DNA-PK catalytic subunit (DNA-PKcs) and the heterodimer Ku70/Ku80, has a major role in non-homologous end joining-the main pathway in mammals used to repair double-strand breaks. DNA-PKcs is a serine/threonine protein kinase comprising a single polypeptide chain of 4,128 amino acids and belonging to the phosphatidylinositol-3-OH kinase (PI(3)K)-related protein family. DNA-PKcs is involved in the sensing and transmission of DNA damage signals to proteins such as p53, setting off events that lead to cell cycle arrest. It phosphorylates a wide range of substrates in vitro, including Ku70/Ku80, which is translocated along DNA. Here we present the crystal structure of human DNA-PKcs at 6.6 A resolution, in which the overall fold is clearly visible, to our knowledge, for the first time. The many alpha-helical HEAT repeats (helix-turn-helix motifs) facilitate bending and allow the polypeptide chain to fold into a hollow circular structure. The carboxy-terminal kinase domain is located on top of this structure, and a small HEAT repeat domain that probably binds DNA is inside. The structure provides a flexible cradle to promote DNA double-strand-break repair.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2811870/" 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/PMC2811870/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Sibanda, Bancinyane L -- Chirgadze, Dimitri Y -- Blundell, Tom L -- 079281/Wellcome Trust/United Kingdom -- A3846/Cancer Research UK/United Kingdom -- Wellcome Trust/United Kingdom -- England -- Nature. 2010 Jan 7;463(7277):118-21. doi: 10.1038/nature08648. Epub 2009 Dec 20.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Biochemistry, University of Cambridge, Old Addenbrooke's site, 80 Tennis Court Road, Cambridge CB2 1GA, UK. lynn@cryst.bioc.cam.ac.uk〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/20023628" target="_blank"〉PubMed〈/a〉
    Keywords: Antigens, Nuclear/chemistry ; Catalytic Domain ; Crystallography, X-Ray ; DNA/metabolism ; DNA Breaks, Double-Stranded ; DNA-Activated Protein Kinase/*chemistry/metabolism ; DNA-Binding Proteins/chemistry ; HeLa Cells ; *Helix-Turn-Helix Motifs ; Humans ; Models, Molecular ; Nuclear Proteins/*chemistry/metabolism ; Protein Folding ; Protein Structure, Secondary
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  • 2
    Publication Date: 2009-12-17
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Knepper, Mark A -- Mindell, Joseph A -- England -- Nature. 2009 Dec 10;462(7274):733-4. doi: 10.1038/462733a.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/20010678" target="_blank"〉PubMed〈/a〉
    Keywords: Crystallography, X-Ray ; Desulfovibrio vulgaris/*chemistry ; Humans ; Kidney/metabolism ; Membrane Transport Proteins/*chemistry/*metabolism ; Protein Structure, Quaternary ; Structure-Activity Relationship ; Urea/chemistry/*metabolism
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  • 3
    Publication Date: 2009-12-17
    Description: How living systems detect the presence of genotoxic damage embedded in a million-fold excess of undamaged DNA is an unresolved question in biology. Here we have captured and structurally elucidated a base-excision DNA repair enzyme, MutM, at the stage of initial encounter with a damaged nucleobase, 8-oxoguanine (oxoG), nested within a DNA duplex. Three structures of intrahelical oxoG-encounter complexes are compared with sequence-matched structures containing a normal G base in place of an oxoG lesion. Although the protein-DNA interfaces in the matched complexes differ by only two atoms-those that distinguish oxoG from G-their pronounced structural differences indicate that MutM can detect a lesion in DNA even at the earliest stages of encounter. All-atom computer simulations show the pathway by which encounter of the enzyme with the lesion causes extrusion from the DNA duplex, and they elucidate the critical free energy difference between oxoG and G along the extrusion pathway.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2951314/" 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/PMC2951314/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Qi, Yan -- Spong, Marie C -- Nam, Kwangho -- Banerjee, Anirban -- Jiralerspong, Sao -- Karplus, Martin -- Verdine, Gregory L -- CA100742/CA/NCI NIH HHS/ -- GM030804/GM/NIGMS NIH HHS/ -- GM044853/GM/NIGMS NIH HHS/ -- GM047467/GM/NIGMS NIH HHS/ -- P01 GM047467/GM/NIGMS NIH HHS/ -- P01 GM047467-100006/GM/NIGMS NIH HHS/ -- P30 EB009998/EB/NIBIB NIH HHS/ -- R01 CA100742/CA/NCI NIH HHS/ -- R01 CA100742-06A1/CA/NCI NIH HHS/ -- R01 GM044853/GM/NIGMS NIH HHS/ -- R01 GM044853-18/GM/NIGMS NIH HHS/ -- Howard Hughes Medical Institute/ -- England -- Nature. 2009 Dec 10;462(7274):762-6. doi: 10.1038/nature08561.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Graduate Program in Biophysics, Harvard Medical School, Boston, Massachusetts 02115, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/20010681" target="_blank"〉PubMed〈/a〉
    Keywords: Biocatalysis ; Computer Simulation ; Crystallography, X-Ray ; *DNA Damage ; *DNA Repair ; DNA-Formamidopyrimidine Glycosylase/genetics/*metabolism ; Genome, Bacterial/genetics ; Geobacillus stearothermophilus/*enzymology/genetics ; Guanine/*analogs & derivatives/metabolism ; Models, Biological ; Models, Molecular ; Molecular Dynamics Simulation ; Mutation/genetics ; Thermodynamics
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  • 4
    Publication Date: 2009-12-17
    Description: 〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3225193/" 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/PMC3225193/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Wollmuth, Lonnie P -- Traynelis, Stephen F -- R01 MH066892/MH/NIMH NIH HHS/ -- R01 MH066892-08/MH/NIMH NIH HHS/ -- England -- Nature. 2009 Dec 10;462(7274):729-31. doi: 10.1038/462729a.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/20010675" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Crystallography, X-Ray ; Ion Channel Gating ; Models, Molecular ; Protein Conformation ; Protein Subunits/chemistry/metabolism ; Rats ; Receptors, AMPA/antagonists & inhibitors/*chemistry/*metabolism ; Receptors, N-Methyl-D-Aspartate/chemistry/metabolism
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  • 5
    Publication Date: 2009-12-01
    Description: Ionotropic glutamate receptors mediate most excitatory neurotransmission in the central nervous system and function by opening a transmembrane ion channel upon binding of glutamate. Despite their crucial role in neurobiology, the architecture and atomic structure of an intact ionotropic glutamate receptor are unknown. Here we report the crystal structure of the alpha-amino-3-hydroxy-5-methyl-4-isoxazole propionic acid (AMPA)-sensitive, homotetrameric, rat GluA2 receptor at 3.6 A resolution in complex with a competitive antagonist. The receptor harbours an overall axis of two-fold symmetry with the extracellular domains organized as pairs of local dimers and with the ion channel domain exhibiting four-fold symmetry. A symmetry mismatch between the extracellular and ion channel domains is mediated by two pairs of conformationally distinct subunits, A/C and B/D. Therefore, the stereochemical manner in which the A/C subunits are coupled to the ion channel gate is different from the B/D subunits. Guided by the GluA2 structure and site-directed cysteine mutagenesis, we suggest that GluN1 and GluN2A NMDA (N-methyl-d-aspartate) receptors have a similar architecture, with subunits arranged in a 1-2-1-2 pattern. We exploit the GluA2 structure to develop mechanisms of ion channel activation, desensitization and inhibition by non-competitive antagonists and pore blockers.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2861655/" 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/PMC2861655/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Sobolevsky, Alexander I -- Rosconi, Michael P -- Gouaux, Eric -- F32 NS049767-05/NS/NINDS NIH HHS/ -- R01 NS038631/NS/NINDS NIH HHS/ -- R01 NS038631-06/NS/NINDS NIH HHS/ -- Howard Hughes Medical Institute/ -- England -- Nature. 2009 Dec 10;462(7274):745-56. doi: 10.1038/nature08624. Epub .〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Vollum Institute, Oregon Health and Science University, 3181 SW Sam Jackson Park Road, Portland, Oregon 97239, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/19946266" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Cell Line ; Crystallization ; Crystallography, X-Ray ; Ion Channel Gating ; Models, Molecular ; Potassium Channels/chemistry/metabolism ; Protein Conformation ; Protein Subunits/chemistry/metabolism ; Rats ; Receptors, AMPA/antagonists & inhibitors/*chemistry/*metabolism ; alpha-Amino-3-hydroxy-5-methyl-4-isoxazolepropionic Acid/metabolism
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  • 6
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    Nature Publishing Group (NPG)
    Publication Date: 2009-11-27
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Lee, Anthony G -- England -- Nature. 2009 Nov 26;462(7272):420-1. doi: 10.1038/462420a.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/19940907" target="_blank"〉PubMed〈/a〉
    Keywords: Crystallography, X-Ray ; Hydrogen Bonding ; Hydrophobic and Hydrophilic Interactions ; Lipid Bilayers/*chemistry/*metabolism ; Models, Molecular ; Molecular Dynamics Simulation ; Neutron Diffraction ; Potassium Channels, Voltage-Gated/*chemistry/*metabolism ; Protein Structure, Tertiary ; Static Electricity
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  • 7
    Publication Date: 2009-11-27
    Description: FocA is a representative member of the formate-nitrite transporter family, which transports short-chain acids in bacteria, archaea, fungi, algae and parasites. The structure and transport mechanism of the formate-nitrite transporter family remain unknown. Here we report the crystal structure of Escherichia coli FocA at 2.25 A resolution. FocA forms a symmetric pentamer, with each protomer consisting of six transmembrane segments. Despite a lack of sequence homology, the overall structure of the FocA protomer closely resembles that of aquaporin and strongly argues that FocA is a channel, rather than a transporter. Structural analysis identifies potentially important channel residues, defines the channel path and reveals two constriction sites. Unlike aquaporin, FocA is impermeable to water but allows the passage of formate. A structural and biochemical investigation provides mechanistic insights into the channel activity of FocA.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Wang, Yi -- Huang, Yongjian -- Wang, Jiawei -- Cheng, Chao -- Huang, Weijiao -- Lu, Peilong -- Xu, Ya-Nan -- Wang, Pengye -- Yan, Nieng -- Shi, Yigong -- England -- Nature. 2009 Nov 26;462(7272):467-72. doi: 10.1038/nature08610.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Ministry of Education Protein Science Laboratory, Center for Structural Biology, School of Life Sciences and School of Medicine, Tsinghua University, Beijing 100084, China.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/19940917" target="_blank"〉PubMed〈/a〉
    Keywords: Aquaporins/*chemistry/metabolism ; Crystallography, X-Ray ; Escherichia coli/chemistry/genetics/metabolism ; Escherichia coli Proteins/*chemistry/genetics/metabolism ; Formates/metabolism ; Liposomes/chemistry/metabolism ; Membrane Transport Proteins/*chemistry/genetics/metabolism ; Models, Molecular ; Molecular Mimicry ; Mutation ; Permeability ; Protein Structure, Quaternary ; Structure-Activity Relationship ; Water/analysis/metabolism
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  • 8
    Publication Date: 2009-11-26
    Description: Mutations in the enzyme cytosolic isocitrate dehydrogenase 1 (IDH1) are a common feature of a major subset of primary human brain cancers. These mutations occur at a single amino acid residue of the IDH1 active site, resulting in loss of the enzyme's ability to catalyse conversion of isocitrate to alpha-ketoglutarate. However, only a single copy of the gene is mutated in tumours, raising the possibility that the mutations do not result in a simple loss of function. Here we show that cancer-associated IDH1 mutations result in a new ability of the enzyme to catalyse the NADPH-dependent reduction of alpha-ketoglutarate to R(-)-2-hydroxyglutarate (2HG). Structural studies demonstrate that when arginine 132 is mutated to histidine, residues in the active site are shifted to produce structural changes consistent with reduced oxidative decarboxylation of isocitrate and acquisition of the ability to convert alpha-ketoglutarate to 2HG. Excess accumulation of 2HG has been shown to lead to an elevated risk of malignant brain tumours in patients with inborn errors of 2HG metabolism. Similarly, in human malignant gliomas harbouring IDH1 mutations, we find markedly elevated levels of 2HG. These data demonstrate that the IDH1 mutations result in production of the onco-metabolite 2HG, and indicate that the excess 2HG which accumulates in vivo contributes to the formation and malignant progression of gliomas.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2818760/" 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/PMC2818760/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Dang, Lenny -- White, David W -- Gross, Stefan -- Bennett, Bryson D -- Bittinger, Mark A -- Driggers, Edward M -- Fantin, Valeria R -- Jang, Hyun Gyung -- Jin, Shengfang -- Keenan, Marie C -- Marks, Kevin M -- Prins, Robert M -- Ward, Patrick S -- Yen, Katharine E -- Liau, Linda M -- Rabinowitz, Joshua D -- Cantley, Lewis C -- Thompson, Craig B -- Vander Heiden, Matthew G -- Su, Shinsan M -- P01 CA104838/CA/NCI NIH HHS/ -- P01 CA104838-05/CA/NCI NIH HHS/ -- P30 EB009998/EB/NIBIB NIH HHS/ -- R01 CA105463/CA/NCI NIH HHS/ -- R01 CA105463-06/CA/NCI NIH HHS/ -- R21 CA128620/CA/NCI NIH HHS/ -- England -- Nature. 2009 Dec 10;462(7274):739-44. doi: 10.1038/nature08617. Epub .〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Agios Pharmaceuticals, Cambridge, Massachusetts 02139, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/19935646" target="_blank"〉PubMed〈/a〉
    Keywords: Arginine/genetics ; Brain Neoplasms/*genetics/*metabolism/pathology ; Catalytic Domain ; Cell Line ; Crystallography, X-Ray ; Disease Progression ; Enzyme Assays ; Glioma/genetics/metabolism/pathology ; Glutarates/*metabolism ; Histidine/genetics/metabolism ; Humans ; Isocitrate Dehydrogenase/*genetics/*metabolism ; Ketoglutaric Acids/metabolism ; Models, Molecular ; Mutant Proteins/*genetics/*metabolism ; Mutation/genetics ; Protein Conformation
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  • 9
    Publication Date: 2009-11-20
    Description: Glutamate transporters are integral membrane proteins that catalyse a thermodynamically uphill uptake of the neurotransmitter glutamate from the synaptic cleft into the cytoplasm of glia and neuronal cells by harnessing the energy of pre-existing electrochemical gradients of ions. Crucial to the reaction is the conformational transition of the transporters between outward and inward facing states, in which the substrate binding sites are accessible from the extracellular space and the cytoplasm, respectively. Here we describe the crystal structure of a double cysteine mutant of a glutamate transporter homologue from Pyrococcus horikoshii, Glt(Ph), which is trapped in the inward facing state by cysteine crosslinking. Together with the previously determined crystal structures of Glt(Ph) in the outward facing state, the structure of the crosslinked mutant allows us to propose a molecular mechanism by which Glt(Ph) and, by analogy, mammalian glutamate transporters mediate sodium-coupled substrate uptake.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2934767/" 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/PMC2934767/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Reyes, Nicolas -- Ginter, Christopher -- Boudker, Olga -- R01 NS064357/NS/NINDS NIH HHS/ -- R01 NS064357-01A1/NS/NINDS NIH HHS/ -- England -- Nature. 2009 Dec 17;462(7275):880-5. doi: 10.1038/nature08616. Epub 2009 Nov 18.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Physiology and Biophysics, Weill Cornell Medical College, 1300 York Avenue, Box 75, New York, New York 10065, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/19924125" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Transport System X-AG/*chemistry/genetics/*metabolism ; Binding Sites ; Biological Transport ; Cross-Linking Reagents ; Crystallography, X-Ray ; Cysteine/genetics/metabolism ; Models, Molecular ; Movement ; Mutant Proteins/chemistry/genetics/metabolism ; Protein Structure, Tertiary ; Pyrococcus horikoshii/*chemistry ; Sodium/metabolism ; Structure-Activity Relationship
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  • 10
    Publication Date: 2009-11-06
    Description: Recent earth science studies have pointed out that massive acceleration of the global nitrogen cycle by anthropogenic addition of bio-available nitrogen has led to a host of environmental problems. Nitrous oxide (N(2)O) is a greenhouse gas that is an intermediate during the biological process known as denitrification. Copper-containing nitrite reductase (CuNIR) is a key enzyme in the process; it produces a precursor for N(2)O by catalysing the one-electron reduction of nitrite (NO2-) to nitric oxide (NO). The reduction step is performed by an efficient electron-transfer reaction with a redox-partner protein. However, details of the mechanism during the electron-transfer reaction are still unknown. Here we show the high-resolution crystal structure of the electron-transfer complex for CuNIR with its cognate cytochrome c as the electron donor. The hydrophobic electron-transfer path is formed at the docking interface by desolvation owing to close contact between the two proteins. Structural analysis of the interface highlights an essential role for the loop region with a hydrophobic patch for protein-protein recognition; it also shows how interface construction allows the variation in atomic components to achieve diverse biological electron transfers.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Nojiri, Masaki -- Koteishi, Hiroyasu -- Nakagami, Takuya -- Kobayashi, Kazuo -- Inoue, Tsuyoshi -- Yamaguchi, Kazuya -- Suzuki, Shinnichiro -- England -- Nature. 2009 Nov 5;462(7269):117-20. doi: 10.1038/nature08507.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Chemistry, Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043, Japan. nojiri@ch.wani.osaka-u.ac.jp〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/19890332" target="_blank"〉PubMed〈/a〉
    Keywords: Achromobacter denitrificans/*enzymology ; Crystallography, X-Ray ; Cytochromes c/chemistry/metabolism ; Electron Transport ; Hydrophobic and Hydrophilic Interactions ; Models, Molecular ; Nitric Oxide/metabolism ; Nitrite Reductases/*chemistry/*metabolism ; Nitrites/metabolism ; Nitrous Oxide/metabolism ; Protein Conformation ; Structure-Activity Relationship
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