View source for 6tpo


==Conformation of cd1 nitrite reductase NirS without bound heme d1==
<StructureSection load='6tpo' size='340' side='right'caption='[[6tpo]], [[Resolution|resolution]] 1.86&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=6TPO OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=6TPO 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]] 1.861&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=1PE:PENTAETHYLENE+GLYCOL'>1PE</scene>, <scene name='pdbligand=BU3:(R,R)-2,3-BUTANEDIOL'>BU3</scene>, <scene name='pdbligand=HEC:HEME+C'>HEC</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=6tpo FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=6tpo OCA], [https://pdbe.org/6tpo PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=6tpo RCSB], [https://www.ebi.ac.uk/pdbsum/6tpo PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=6tpo ProSAT]</span></td></tr>
</table>
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== Publication Abstract from PubMed ==
A key step in anaerobic nitrate respiration is the reduction of nitrite to nitric oxide, which is catalysed by the cd1 nitrite reductase NirS in, for example, the Gram-negative opportunistic pathogen Pseudomonas aeruginosa. Each subunit of this homodimeric enzyme consists of a cytochrome c domain and an eight-bladed beta-propeller that binds the uncommon isobacteriochlorin heme d1 as an essential part of its active site. Although NirS has been well studied mechanistically and structurally, the focus of previous studies has been on the active heme d1-bound form. The heme d1-free form of NirS reported here, which represents a premature state of the reductase, adopts an open conformation with the cytochrome c domains moved away from each other with respect to the active enzyme. Further, the movement of a loop around Trp498 seems to be related to a widening of the propeller, allowing easier access to the heme d1-binding side. Finally, a possible link between the open conformation of NirS and flagella formation in P. aeruginosa is discussed.

Structure of heme d1-free cd1 nitrite reductase NirS.,Klunemann T, Blankenfeldt W Acta Crystallogr F Struct Biol Commun. 2020 Jun 1;76(Pt 6):250-256. doi:, 10.1107/S2053230X20006676. Epub 2020 May 29. PMID:32510465<ref>PMID:32510465</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 6tpo" style="background-color:#fffaf0;"></div>

==See Also==
*[[Cytochrome c nitrite reductase|Cytochrome c nitrite reductase]]
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Large Structures]]
[[Category: Blankenfeldt W]]
[[Category: Kluenemann T]]