View source for 3bnh


==W. succinogenes NrfA Y218F Nitrite Complex==
<StructureSection load='3bnh' size='340' side='right'caption='[[3bnh]], [[Resolution|resolution]] 1.75&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[3bnh]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Wolinella_succinogenes Wolinella succinogenes]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=3BNH OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=3BNH FirstGlance]. <br>
</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 1.75&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=ACT:ACETATE+ION'>ACT</scene>, <scene name='pdbligand=CA:CALCIUM+ION'>CA</scene>, <scene name='pdbligand=HEM:PROTOPORPHYRIN+IX+CONTAINING+FE'>HEM</scene>, <scene name='pdbligand=NO2:NITRITE+ION'>NO2</scene>, <scene name='pdbligand=SO4:SULFATE+ION'>SO4</scene>, <scene name='pdbligand=Y1:YTTRIUM+ION'>Y1</scene></td></tr>
<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=3bnh FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=3bnh OCA], [https://pdbe.org/3bnh PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=3bnh RCSB], [https://www.ebi.ac.uk/pdbsum/3bnh PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=3bnh ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/NRFA_WOLSU NRFA_WOLSU] Plays a role in nitrite reduction.<ref>PMID:10672190</ref> 
== Evolutionary Conservation ==
[[Image:Consurf_key_small.gif|200px|right]]
Check<jmol>
  <jmolCheckbox>
    <scriptWhenChecked>; select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/bn/3bnh_consurf.spt"</scriptWhenChecked>
    <scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview03.spt</scriptWhenUnchecked>
    <text>to colour the structure by Evolutionary Conservation</text>
  </jmolCheckbox>
</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=3bnh ConSurf].
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== Publication Abstract from PubMed ==
Pentaheme cytochrome c nitrite reductase (ccNiR) catalyzes the six-electron reduction of nitrite to ammonia as the final step in the dissimilatory pathway of nitrate ammonification. It has also been shown to reduce sulfite to sulfide, thus forming the only known link between the biogeochemical cycles of nitrogen and of sulfur. We have found the sulfite reductase activity of ccNiR from Wolinella succinogenes to be significantly smaller than its nitrite reductase activity but still several times higher than the one described for dissimilatory, siroheme-containing sulfite reductases. To compare the sulfite reductase activity of ccNiR with our previous data on nitrite reduction, we determined the binding mode of sulfite to the catalytic heme center of ccNiR from W. succinogenes at a resolution of 1.7 A. Sulfite and nitrite both provide a pair of electrons to form the coordinative bond to the Fe(III) active site of the enzyme, and the oxygen atoms of sulfite are found to interact with the three active site protein residues conserved within the enzyme family. Furthermore, we have characterized the active site variant Y218F of ccNiR that exhibited an almost complete loss of nitrite reductase activity, while sulfite reduction remained unaffected. These data provide a first direct insight into the role of the first sphere of protein ligands at the active site in ccNiR catalysis.

Binding and Reduction of Sulfite by Cytochrome c Nitrite Reductase(,).,Lukat P, Rudolf M, Stach P, Messerschmidt A, Kroneck PM, Simon J, Einsle O Biochemistry. 2008 Feb 19;47(7):2080-2086. Epub 2008 Jan 18. PMID:18201106<ref>PMID:18201106</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
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<div class="pdbe-citations 3bnh" style="background-color:#fffaf0;"></div>

==See Also==
*[[Cytochrome c nitrite reductase|Cytochrome c nitrite reductase]]
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Large Structures]]
[[Category: Wolinella succinogenes]]
[[Category: Einsle O]]
[[Category: Lukat P]]