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3sx6

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==Crystal structure of sulfide:quinone oxidoreductase Cys356Ala variant from Acidithiobacillus ferrooxidans complexed with decylubiquinone==
==Crystal structure of sulfide:quinone oxidoreductase Cys356Ala variant from Acidithiobacillus ferrooxidans complexed with decylubiquinone==
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<StructureSection load='3sx6' size='340' side='right' caption='[[3sx6]], [[Resolution|resolution]] 1.80&Aring;' scene=''>
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<StructureSection load='3sx6' size='340' side='right'caption='[[3sx6]], [[Resolution|resolution]] 1.80&Aring;' scene=''>
== Structural highlights ==
== Structural highlights ==
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<table><tr><td colspan='2'>[[3sx6]] is a 1 chain structure with sequence from [http://en.wikipedia.org/wiki/Acidithiobacillus_ferrooxidans Acidithiobacillus ferrooxidans]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=3SX6 OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=3SX6 FirstGlance]. <br>
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<table><tr><td colspan='2'>[[3sx6]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Acidithiobacillus_ferrooxidans_ATCC_23270 Acidithiobacillus ferrooxidans ATCC 23270]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=3SX6 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=3SX6 FirstGlance]. <br>
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</td></tr><tr><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=DCQ:2-DECYL-5,6-DIMETHOXY-3-METHYLCYCLOHEXA-2,5-DIENE-1,4-DIONE'>DCQ</scene>, <scene name='pdbligand=FAD:FLAVIN-ADENINE+DINUCLEOTIDE'>FAD</scene>, <scene name='pdbligand=H2S:HYDROSULFURIC+ACID'>H2S</scene>, <scene name='pdbligand=LMT:DODECYL-BETA-D-MALTOSIDE'>LMT</scene>, <scene name='pdbligand=SO4:SULFATE+ION'>SO4</scene><br>
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</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 1.7955&#8491;</td></tr>
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<tr><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[3kpg|3kpg]], [[3kpi|3kpi]], [[3kpk|3kpk]], [[3sxi|3sxi]], [[3sy4|3sy4]], [[3syi|3syi]], [[3sz0|3sz0]], [[3szc|3szc]], [[3szf|3szf]]</td></tr>
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<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=DCQ:2-DECYL-5,6-DIMETHOXY-3-METHYLCYCLOHEXA-2,5-DIENE-1,4-DIONE'>DCQ</scene>, <scene name='pdbligand=FAD:FLAVIN-ADENINE+DINUCLEOTIDE'>FAD</scene>, <scene name='pdbligand=H2S:HYDROSULFURIC+ACID'>H2S</scene>, <scene name='pdbligand=LMT:DODECYL-BETA-D-MALTOSIDE'>LMT</scene>, <scene name='pdbligand=SO4:SULFATE+ION'>SO4</scene></td></tr>
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<tr><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">AFE_1792 ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=920 Acidithiobacillus ferrooxidans])</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=3sx6 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=3sx6 OCA], [https://pdbe.org/3sx6 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=3sx6 RCSB], [https://www.ebi.ac.uk/pdbsum/3sx6 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=3sx6 ProSAT]</span></td></tr>
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<tr><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=3sx6 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=3sx6 OCA], [http://www.rcsb.org/pdb/explore.do?structureId=3sx6 RCSB], [http://www.ebi.ac.uk/pdbsum/3sx6 PDBsum]</span></td></tr>
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</table>
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<table>
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== Function ==
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<div style="background-color:#fffaf0;">
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[https://www.uniprot.org/uniprot/SQRD_ACIF2 SQRD_ACIF2] Catalyzes the oxidation of hydrogen sulfide, with the help of a quinone. Consecutive reaction cycles lead to the accumulation of a polysulfide product on the active site Cys residues; these products are released when they exceed a critical length, typically as cyclooctasulfur.<ref>PMID:20303979</ref> <ref>PMID:22542586</ref>
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== Publication Abstract from PubMed ==
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Sulfide:quinone oxidoreductase (SQR) is a peripheral membrane protein that catalyzes the oxidation of sulfide species to elemental sulfur. The enzymatic reaction proceeds in two steps. The electrons from sulfides are transferred first to the enzyme cofactor, FAD, which, in turn, passes them onto the quinone pool in the membrane. Several wild-type SQR structures have been reported recently. However, the enzymatic mechanism of SQR has not been fully delineated. In order to understand the role of the catalytically essential residues in the enzymatic mechanism of SQR we produced a number of variants of the conserved residues in the catalytic site including the cysteine triad of SQR from the acidophilic, chemolithotrophic bacterium Acidithiobacillus ferrooxidans. These were structurally characterized and their activities for each reaction step were determined. In addition, the crystal structures of the wild-type SQR with sodium selenide and gold(I) cyanide have been determined. Previously we proposed a mechanism for the reduction of sulfides to elemental sulfur involving nucleophilic attack of Cys356 on C(4A) atom of FAD. Here we also consider an alternative anionic radical mechanism by direct electron transfer from Cys356 to the isoalloxazine ring of FAD.
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Structure-activity characterization of sulfide:quinone oxidoreductase variants.,Cherney MM, Zhang Y, James MN, Weiner JH J Struct Biol. 2012 Apr 19. PMID:22542586<ref>PMID:22542586</ref>
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.<br>
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</div>
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== References ==
== References ==
<references/>
<references/>
__TOC__
__TOC__
</StructureSection>
</StructureSection>
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[[Category: Acidithiobacillus ferrooxidans]]
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[[Category: Acidithiobacillus ferrooxidans ATCC 23270]]
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[[Category: Cherney, M M.]]
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[[Category: Large Structures]]
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[[Category: James, M N.G.]]
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[[Category: Cherney MM]]
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[[Category: Weiner, J H.]]
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[[Category: James MNG]]
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[[Category: Zhang, Y.]]
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[[Category: Weiner JH]]
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[[Category: Complex with sulfide and decylubiquinone]]
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[[Category: Zhang Y]]
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[[Category: Cys356ala variant]]
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[[Category: Integral monotopic membrane protein]]
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[[Category: Oxidoreductase]]
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[[Category: Sulfide:quinone oxidoreductase]]
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Current revision

Crystal structure of sulfide:quinone oxidoreductase Cys356Ala variant from Acidithiobacillus ferrooxidans complexed with decylubiquinone

PDB ID 3sx6

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