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2ot4

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[[Image:2ot4.png|left|200px]]
 
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==Structure of a hexameric multiheme c nitrite reductase from the extremophile bacterium Thiolkalivibrio nitratireducens==
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The line below this paragraph, containing "STRUCTURE_2ot4", creates the "Structure Box" on the page.
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<StructureSection load='2ot4' size='340' side='right'caption='[[2ot4]], [[Resolution|resolution]] 1.50&Aring;' scene=''>
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You may change the PDB parameter (which sets the PDB file loaded into the applet)
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== Structural highlights ==
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or the SCENE parameter (which sets the initial scene displayed when the page is loaded),
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<table><tr><td colspan='2'>[[2ot4]] is a 2 chain structure with sequence from [https://en.wikipedia.org/wiki/Dsm_14787 Dsm 14787]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2OT4 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=2OT4 FirstGlance]. <br>
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or leave the SCENE parameter empty for the default display.
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</td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=CA:CALCIUM+ION'>CA</scene>, <scene name='pdbligand=CIT:CITRIC+ACID'>CIT</scene>, <scene name='pdbligand=HEC:HEME+C'>HEC</scene>, <scene name='pdbligand=MPD:(4S)-2-METHYL-2,4-PENTANEDIOL'>MPD</scene>, <scene name='pdbligand=MRD:(4R)-2-METHYLPENTANE-2,4-DIOL'>MRD</scene></td></tr>
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<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=2ot4 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2ot4 OCA], [https://pdbe.org/2ot4 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=2ot4 RCSB], [https://www.ebi.ac.uk/pdbsum/2ot4 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=2ot4 ProSAT]</span></td></tr>
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{{STRUCTURE_2ot4| PDB=2ot4 | SCENE= }}
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</table>
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== Function ==
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[[https://www.uniprot.org/uniprot/Q5F2I3_9GAMM Q5F2I3_9GAMM]] Plays a role in nitrite reduction (By similarity).[SAAS:SAAS003321_004_001592]
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== Evolutionary Conservation ==
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[[Image:Consurf_key_small.gif|200px|right]]
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Check<jmol>
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<jmolCheckbox>
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<scriptWhenChecked>; select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/ot/2ot4_consurf.spt"</scriptWhenChecked>
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<scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview01.spt</scriptWhenUnchecked>
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<text>to colour the structure by Evolutionary Conservation</text>
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</jmolCheckbox>
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</jmol>, as determined by [http://consurfdb.tau.ac.il/ ConSurfDB]. You may read the [[Conservation%2C_Evolutionary|explanation]] of the method and the full data available from [http://bental.tau.ac.il/new_ConSurfDB/main_output.php?pdb_ID=2ot4 ConSurf].
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<div style="clear:both"></div>
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<div style="background-color:#fffaf0;">
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== Publication Abstract from PubMed ==
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Bacterial pentaheme cytochrome c nitrite reductases (NrfAs) are key enzymes involved in the terminal step of dissimilatory nitrite reduction of the nitrogen cycle. Their structure and functions are well studied. Recently, a novel octaheme cytochrome c nitrite reductase (TvNiR) has been isolated from the haloalkaliphilic bacterium Thioalkalivibrio nitratireducens. Here we present high-resolution crystal structures of the apoenzyme and its complexes with the substrate (nitrite) and the inhibitor (azide). Both in the crystalline state and in solution, TvNiR exists as a stable hexamer containing 48 hemes-the largest number of hemes accommodated within one protein molecule known to date. The subunit of TvNiR consists of two domains. The N-terminal domain has a unique fold and contains three hemes. The catalytic C-terminal domain hosts the remaining five hemes, their arrangement, including the catalytic heme, being identical to that found in NrfAs. The complete set of eight hemes forms a spatial pattern characteristic of other multiheme proteins, including structurally characterized octaheme cytochromes. The catalytic machinery of TvNiR resembles that of NrfAs. It comprises the lysine residue at the proximal position of the catalytic heme, the catalytic triad of tyrosine, histidine, and arginine at the distal side, channels for the substrate and product transport with a characteristic gradient of electrostatic potential, and, finally, two conserved Ca(2+)-binding sites. However, TvNiR has a number of special structural features, including a covalent bond between the catalytic tyrosine and the adjacent cysteine and the unusual topography of the product channels that open into the void interior space of the protein hexamer. The role of these characteristic structural features in the catalysis by this enzyme is discussed.
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===Structure of a hexameric multiheme c nitrite reductase from the extremophile bacterium Thiolkalivibrio nitratireducens===
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High-resolution structural analysis of a novel octaheme cytochrome c nitrite reductase from the haloalkaliphilic bacterium Thioalkalivibrio nitratireducens.,Polyakov KM, Boyko KM, Tikhonova TV, Slutsky A, Antipov AN, Zvyagilskaya RA, Popov AN, Bourenkov GP, Lamzin VS, Popov VO J Mol Biol. 2009 Jun 26;389(5):846-62. Epub 2009 Apr 23. PMID:19393666<ref>PMID:19393666</ref>
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From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
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</div>
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<div class="pdbe-citations 2ot4" style="background-color:#fffaf0;"></div>
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==See Also==
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The line below this paragraph, {{ABSTRACT_PUBMED_19393666}}, adds the Publication Abstract to the page
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*[[Cytochrome c nitrite reductase|Cytochrome c nitrite reductase]]
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(as it appears on PubMed at http://www.pubmed.gov), where 19393666 is the PubMed ID number.
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*[[Nitrite reductase 3D structures|Nitrite reductase 3D structures]]
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== References ==
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{{ABSTRACT_PUBMED_19393666}}
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<references/>
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__TOC__
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==About this Structure==
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</StructureSection>
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[[2ot4]] is a 2 chain structure with sequence from [http://en.wikipedia.org/wiki/Thioalkalivibrio_nitratireducens Thioalkalivibrio nitratireducens]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2OT4 OCA].
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[[Category: Dsm 14787]]
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[[Category: Large Structures]]
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==Reference==
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[[Category: Antipov, A N]]
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<ref group="xtra">PMID:19393666</ref><references group="xtra"/>
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[[Category: Bourenkov, G P]]
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[[Category: Thioalkalivibrio nitratireducens]]
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[[Category: Boyko, K M]]
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[[Category: Antipov, A N.]]
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[[Category: Lamzin, V S]]
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[[Category: Bourenkov, G P.]]
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[[Category: Polyakov, K M]]
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[[Category: Boyko, K M.]]
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[[Category: Popov, A N]]
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[[Category: Lamzin, V S.]]
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[[Category: Popov, V O]]
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[[Category: Polyakov, K M.]]
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[[Category: Slutsky, A]]
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[[Category: Popov, A N.]]
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[[Category: Tikhonova, T V]]
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[[Category: Popov, V O.]]
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[[Category: Zvyagilskaya, R A]]
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[[Category: Slutsky, A.]]
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[[Category: Tikhonova, T V.]]
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[[Category: Zvyagilskaya, R A.]]
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[[Category: Cytochrome c nitrite reductase]]
[[Category: Cytochrome c nitrite reductase]]
[[Category: Nrfa]]
[[Category: Nrfa]]
[[Category: Oxidoreductase]]
[[Category: Oxidoreductase]]
[[Category: Sulfite reductase]]
[[Category: Sulfite reductase]]

Current revision

Structure of a hexameric multiheme c nitrite reductase from the extremophile bacterium Thiolkalivibrio nitratireducens

PDB ID 2ot4

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