The Enzyme Database

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Accepted name: sulfur oxygenase/reductase
Reaction: 4 sulfur + 4 H2O + O2 = 2 hydrogen sulfide + 2 sulfite
Other name(s): SOR; sulfur oxygenase; sulfur oxygenase reductase
Systematic name: sulfur:oxygen oxidoreductase (hydrogen-sulfide- and sulfite-forming)
Comments: This enzyme, which is found in thermophilic microorganisms, contains one mononuclear none-heme iron centre per subunit. Elemental sulfur is both the electron donor and one of the two known acceptors, the other being oxygen. Thiosulfate is also observed as a product, but is likely formed non-enzymically by a reaction between sulfite and sulfur [1]. This enzyme differs from EC, sulfur dioxygenase and EC, sulfhydrogenase, in that both activities occur simultaneously.
Links to other databases: BRENDA, EXPASY, KEGG, MetaCyc, PDB, CAS registry number: 120598-92-7
1.  Kletzin, A. Coupled enzymatic production of sulfite, thiosulfate, and hydrogen sulfide from sulfur: purification and properties of a sulfur oxygenase reductase from the facultatively anaerobic archaebacterium Desulfurolobus ambivalens. J. Bacteriol. 171 (1989) 1638–1643. [DOI] [PMID: 2493451]
2.  Kletzin, A. Molecular characterization of the sor gene, which encodes the sulfur oxygenase/reductase of the thermoacidophilic Archaeum Desulfurolobus ambivalens. J. Bacteriol. 174 (1992) 5854–5859. [DOI] [PMID: 1522063]
3.  Sun, C.W., Chen, Z.W., He, Z.G., Zhou, P.J. and Liu, S.J. Purification and properties of the sulfur oxygenase/reductase from the acidothermophilic archaeon, Acidianus strain S5. Extremophiles 7 (2003) 131–134. [DOI] [PMID: 12664265]
4.  Urich, T., Bandeiras, T.M., Leal, S.S., Rachel, R., Albrecht, T., Zimmermann, P., Scholz, C., Teixeira, M., Gomes, C.M. and Kletzin, A. The sulphur oxygenase reductase from Acidianus ambivalens is a multimeric protein containing a low-potential mononuclear non-haem iron centre. Biochem. J. 381 (2004) 137–146. [DOI] [PMID: 15030315]
[EC created 2006]

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