View source for 4uql


==High-resolution structure of a Ni-A Ni-Sox mixture of the D. fructosovorans NiFe-hydrogenase L122A mutant==
<StructureSection load='4uql' size='340' side='right'caption='[[4uql]], [[Resolution|resolution]] 1.22&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[4uql]] is a 4 chain structure with sequence from [https://en.wikipedia.org/wiki/Solidesulfovibrio_fructosivorans Solidesulfovibrio fructosivorans]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=4UQL OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=4UQL 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]] 1.22&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=CL:CHLORIDE+ION'>CL</scene>, <scene name='pdbligand=CSS:S-MERCAPTOCYSTEINE'>CSS</scene>, <scene name='pdbligand=CSX:S-OXY+CYSTEINE'>CSX</scene>, <scene name='pdbligand=FCO:CARBONMONOXIDE-(DICYANO)+IRON'>FCO</scene>, <scene name='pdbligand=GLY:GLYCINE'>GLY</scene>, <scene name='pdbligand=GOL:GLYCEROL'>GOL</scene>, <scene name='pdbligand=H2S:HYDROSULFURIC+ACID'>H2S</scene>, <scene name='pdbligand=MG:MAGNESIUM+ION'>MG</scene>, <scene name='pdbligand=NI:NICKEL+(II)+ION'>NI</scene>, <scene name='pdbligand=SOT:MORPHOLINE-4-SULFONIC+ACID'>SOT</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=4uql FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4uql OCA], [https://pdbe.org/4uql PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=4uql RCSB], [https://www.ebi.ac.uk/pdbsum/4uql PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=4uql ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/PHNS_SOLFR PHNS_SOLFR] Involved in hydrogen uptake for the anaerobic reduction of sulfate to hydrogen sulfide in an electron transport chain. Cytochrome c3 is the physiological electron acceptor.
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
Catalytically inactive oxidized O2-sensitive [NiFe]-hydrogenases are characterized by a mixture of the paramagnetic Ni-A and Ni-B states. Upon O2 exposure, enzymes in a partially reduced state preferentially form the unready Ni-A state. Because partial O2 reduction should generate a peroxide intermediate, this species was previously assigned to the elongated Ni-Fe bridging electron density observed for preparations of [NiFe]-hydrogenases known to contain the Ni-A state. However, this proposition has been challenged based on the stability of this state to UV light exposure and the possibility of generating it anaerobically under either chemical or electrochemical oxidizing conditions. Consequently, we have considered alternative structures for the Ni-A species including oxidation of thiolate ligands to either sulfenate or sulfenic acid. Here, we report both new and revised [NiFe]-hydrogenases structures and conclude, taking into account corresponding characterizations by Fourier transform infrared spectroscopy (FTIR), that the Ni-A species contains oxidized cysteine and bridging hydroxide ligands instead of the peroxide ligand we proposed earlier. Our analysis was rendered difficult by the typical formation of mixtures of unready oxidized states that, furthermore, can be reduced by X-ray induced photoelectrons. The present study could be carried out thanks to the use of Desulfovibrio fructosovorans [NiFe]-hydrogenase mutants with special properties. In addition to the Ni-A state, crystallographic results are also reported for two diamagnetic unready states, allowing the proposal of a revised oxidized inactive Ni-SU model and a new structure characterized by a persulfide ion that is assigned to an Ni-'Sox' species.

Crystallographic studies of [NiFe]-hydrogenase mutants: towards consensus structures for the elusive unready oxidized states.,Volbeda A, Martin L, Barbier E, Gutierrez-Sanz O, De Lacey AL, Liebgott PP, Dementin S, Rousset M, Fontecilla-Camps JC J Biol Inorg Chem. 2014 Oct 15. PMID:25315838<ref>PMID:25315838</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 4uql" style="background-color:#fffaf0;"></div>
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Large Structures]]
[[Category: Solidesulfovibrio fructosivorans]]
[[Category: Barbier E]]
[[Category: DeLacey AL]]
[[Category: Dementin S]]
[[Category: Fontecilla-Camps JC]]
[[Category: Gutierrez-Sanz O]]
[[Category: Liebgott PP]]
[[Category: Martin L]]
[[Category: Rousset M]]
[[Category: Volbeda A]]