View source for 1qdb


==CYTOCHROME C NITRITE REDUCTASE==
<StructureSection load='1qdb' size='340' side='right'caption='[[1qdb]], [[Resolution|resolution]] 1.90&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[1qdb]] is a 3 chain structure with sequence from [http://en.wikipedia.org/wiki/Sulfurospirillum_deleyianum Sulfurospirillum deleyianum]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1QDB OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1QDB FirstGlance]. <br>
</td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=CA:CALCIUM+ION'>CA</scene>, <scene name='pdbligand=HEM:PROTOPORPHYRIN+IX+CONTAINING+FE'>HEM</scene>, <scene name='pdbligand=SO4:SULFATE+ION'>SO4</scene></td></tr>
<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1qdb FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1qdb OCA], [http://pdbe.org/1qdb PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=1qdb RCSB], [http://www.ebi.ac.uk/pdbsum/1qdb PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=1qdb ProSAT]</span></td></tr>
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== Function ==
[[http://www.uniprot.org/uniprot/NRFA_SULDE NRFA_SULDE]] Plays a role in nitrite reduction.[HAMAP-Rule:MF_01182] 
== 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/qd/1qdb_consurf.spt"</scriptWhenChecked>
    <scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview01.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=1qdb ConSurf].
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== Publication Abstract from PubMed ==
The enzyme cytochrome c nitrite reductase catalyses the six-electron reduction of nitrite to ammonia as one of the key steps in the biological nitrogen cycle, where it participates in the anaerobic energy metabolism of dissimilatory nitrate ammonification. Here we report on the crystal structure of this enzyme from the microorganism Sulfurospirillum deleyianum, which we solved by multiwavelength anomalous dispersion methods. We propose a reaction scheme for the transformation of nitrite based on structural and spectroscopic information. Cytochrome c nitrite reductase is a functional dimer, with 10 close-packed haem groups of type c and an unusual lysine-coordinated high-spin haem at the active site. By comparing the haem arrangement of this nitrite reductase with that of other multihaem cytochromes, we have been able to identify a family of proteins in which the orientation of haem groups is conserved whereas structure and function are not.

Structure of cytochrome c nitrite reductase.,Einsle O, Messerschmidt A, Stach P, Bourenkov GP, Bartunik HD, Huber R, Kroneck PM Nature. 1999 Jul 29;400(6743):476-80. PMID:10440380<ref>PMID:10440380</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 1qdb" style="background-color:#fffaf0;"></div>

==See Also==
*[[Cytochrome C 3D structures|Cytochrome C 3D structures]]
*[[Nitrite reductase 3D structures|Nitrite reductase 3D structures]]
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Large Structures]]
[[Category: Sulfurospirillum deleyianum]]
[[Category: Einsle, O]]
[[Category: Huber, R]]
[[Category: Kroneck, P M.H]]
[[Category: Messerschmidt, A]]
[[Category: Stach, P]]
[[Category: C-type cytochrome lysine-coordinated heme nitrite reductase]]
[[Category: Oxidoreductase]]