Sulfur oxygenase/reductase

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In enzymology, a sulfur oxygenase/reductase (EC 1.13.11.55) is an enzyme that catalyzes the chemical reaction

4 sulfur + 4 H₂O + O₂ $\rightleftharpoons$ 2 hydrogen sulfide + 2 bisulfite + 2 H⁺

The 3 substrates of this enzyme are sulfur, H₂O, and O₂, whereas its 3 products are hydrogen sulfide, bisulfite, and H⁺.

This enzyme belongs to the family of oxidoreductases, specifically those acting on single donors with O₂ as oxidant and incorporation of two atoms of oxygen into the substrate (oxygenases). The oxygen incorporated need not be derived from O₂. The systematic name of this enzyme class is sulfur:oxygen oxidoreductase (hydrogen-sulfide- and sulfite-forming). Other names in common use include SOR, sulfur oxygenase, and sulfur oxygenase reductase.

[edit] References

IUBMB entry for 1.13.11.55
BRENDA references for 1.13.11.55 (Recommended.)
PubMed references for 1.13.11.55
PubMed Central references for 1.13.11.55
Google Scholar references for 1.13.11.55
Kletzin A (1989). "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: 1638–43. PMID 2493451.
Kletzin A (1992). "Molecular characterization of the sor gene, which encodes the sulfur oxygenase/reductase of the thermoacidophilic Archaeum Desulfurolobus ambivalens". J. Bacteriol. 174: 5854–9. PMID 1522063.
Sun CW, Chen ZW, He ZG, Zhou PJ, Liu SJ (2003). "Purification and properties of the sulfur oxygenase/reductase from the acidothermophilic archaeon, Acidianus strain S5". Extremophiles. 7: 131–4. doi:10.1007/s00792-002-0304-5. PMID 12664265.
Scholz C, Teixeira M, Gomes CM, Kletzin A (2004). "The sulphur oxygenase reductase from Acidianus ambivalens is a multimeric protein containing a low-potential mononuclear non-haem iron centre". Biochem. J. 381: 137–46. doi:10.1042/BJ20040003. PMID 15030315.