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1h32

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Revision as of 19:32, 10 September 2015

REDUCED SOXAX COMPLEX FROM RHODOVULUM SULFIDOPHILUM

Structural highlights

1h32 is a 2 chain structure with sequence from Rhodovulum sulfidophilum. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
Ligands:	,
NonStd Res:
Related:	1h31, 1h33
Resources:	FirstGlance, OCA, PDBe, RCSB, PDBsum

Function

[SOXA_RHOSU] C-type diheme cytochrome, which is part of the SoxAX cytochrome complex involved in sulfur oxidation. The SoxAX complex catalyzes the formation of a heterodisulfide bond between the conserved cysteine residue on a sulfur carrier SoxYZ complex subunit SoxY and thiosulfate or other inorganic sulfur substrates. This leads to the liberation of two electrons, which may be transferred from the SoxAX complex to another cytochrome c and which then may be used for reductive CO(2) fixation.^[1] ^[2] ^[3] ^[4]

Evolutionary Conservation

Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf.

Publication Abstract from PubMed

Reduced inorganic sulfur compounds are utilized by many bacteria as electron donors to photosynthetic or respiratory electron transport chains. This metabolism is a key component of the biogeochemical sulfur cycle. The SoxAX protein is a heterodimeric c-type cytochrome involved in thiosulfate oxidation. The crystal structures of SoxAX from the photosynthetic bacterium Rhodovulum sulfidophilum have been solved at 1.75 A resolution in the oxidized state and at 1.5 A resolution in the dithionite-reduced state, providing the first structural insights into the enzymatic oxidation of thiosulfate. The SoxAX active site contains a haem with unprecedented cysteine persulfide (cysteine sulfane) coordination. This unusual post-translational modification is also seen in sulfurtransferases such as rhodanese. Intriguingly, this enzyme shares further active site characteristics with SoxAX such as an adjacent conserved arginine residue and a strongly positive electrostatic potential. These similarities have allowed us to suggest a catalytic mechanism for enzymatic thiosulfate oxidation. The atomic coordinates and experimental structure factors have been deposited in the PDB with the accession codes 1H31, 1H32 and 1H33.

Structural basis for the oxidation of thiosulfate by a sulfur cycle enzyme.,Bamford VA, Bruno S, Rasmussen T, Appia-Ayme C, Cheesman MR, Berks BC, Hemmings AM EMBO J. 2002 Nov 1;21(21):5599-610. PMID:12411478^[5]

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

References

↑ Cheesman MR, Little PJ, Berks BC. Novel heme ligation in a c-type cytochrome involved in thiosulfate oxidation: EPR and MCD of SoxAX from Rhodovulum sulfidophilum. Biochemistry. 2001 Sep 4;40(35):10562-9. PMID:11523998
↑ Appia-Ayme C, Little PJ, Matsumoto Y, Leech AP, Berks BC. Cytochrome complex essential for photosynthetic oxidation of both thiosulfate and sulfide in Rhodovulum sulfidophilum. J Bacteriol. 2001 Oct;183(20):6107-18. PMID:11567011 doi:http://dx.doi.org/10.1128/JB.183.20.6107-6118.2001
↑ Bamford VA, Bruno S, Rasmussen T, Appia-Ayme C, Cheesman MR, Berks BC, Hemmings AM. Structural basis for the oxidation of thiosulfate by a sulfur cycle enzyme. EMBO J. 2002 Nov 1;21(21):5599-610. PMID:12411478
↑ Bradley JM, Marritt SJ, Kihlken MA, Haynes K, Hemmings AM, Berks BC, Cheesman MR, Butt JN. Redox and chemical activities of the hemes in the sulfur oxidation pathway enzyme SoxAX. J Biol Chem. 2012 Nov 23;287(48):40350-9. doi: 10.1074/jbc.M112.396192. Epub 2012, Oct 11. PMID:23060437 doi:http://dx.doi.org/10.1074/jbc.M112.396192
↑ Bamford VA, Bruno S, Rasmussen T, Appia-Ayme C, Cheesman MR, Berks BC, Hemmings AM. Structural basis for the oxidation of thiosulfate by a sulfur cycle enzyme. EMBO J. 2002 Nov 1;21(21):5599-610. PMID:12411478

1 Structural highlights
2 Function
3 Evolutionary Conservation
4 Publication Abstract from PubMed
5 See Also
6 References

Proteopedia Page Contributors and Editors (what is this?)

OCA

Retrieved from "http://52.214.119.220/wiki/index.php/1h32"

@@ Line 6: / Line 6: @@
 <tr id='NonStdRes'><td class="sblockLbl"><b>[[Non-Standard_Residue|NonStd Res:]]</b></td><td class="sblockDat"><scene name='pdbligand=CSS:S-MERCAPTOCYSTEINE'>CSS</scene></td></tr>
 <tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[1h31|1h31]], [[1h33|1h33]]</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=1h32 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1h32 OCA], [http://www.rcsb.org/pdb/explore.do?structureId=1h32 RCSB], [http://www.ebi.ac.uk/pdbsum/1h32 PDBsum]</span></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=1h32 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1h32 OCA], [http://pdbe.org/1h32 PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=1h32 RCSB], [http://www.ebi.ac.uk/pdbsum/1h32 PDBsum]</span></td></tr>
 </table>
+== Function ==
+[[http://www.uniprot.org/uniprot/SOXA_RHOSU SOXA_RHOSU]] C-type diheme cytochrome, which is part of the SoxAX cytochrome complex involved in sulfur oxidation. The SoxAX complex catalyzes the formation of a heterodisulfide bond between the conserved cysteine residue on a sulfur carrier SoxYZ complex subunit SoxY and thiosulfate or other inorganic sulfur substrates. This leads to the liberation of two electrons, which may be transferred from the SoxAX complex to another cytochrome c and which then may be used for reductive CO(2) fixation.<ref>PMID:11523998</ref> <ref>PMID:11567011</ref> <ref>PMID:12411478</ref> <ref>PMID:23060437</ref>
 == Evolutionary Conservation ==
 [[Image:Consurf_key_small.gif|200px|right]]
@@ Line 26: / Line 28: @@
 From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
 </div>
+<div class="pdbe-citations 1h32" style="background-color:#fffaf0;"></div>
 ==See Also==

1h32

From Proteopedia

Revision as of 19:32, 10 September 2015

REDUCED SOXAX COMPLEX FROM RHODOVULUM SULFIDOPHILUM

Structural highlights

Function

Evolutionary Conservation

Publication Abstract from PubMed

See Also

References

Contents

Proteopedia Page Contributors and Editors (what is this?)

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