Reaction: S-sulfanylglutathione + O2 + H2O = glutathione + sulfite + 2 H+ (overall reaction)
(1a) S-sulfanylglutathione + O2 = S-sulfinatoglutathione + H+
(1b) S-sulfinatoglutathione + H2O = glutathione + sulfite + H+ (spontaneous)
Other name(s): sulfur oxygenase (incorrect); sulfur:oxygen oxidoreductase (incorrect); sulfur dioxygenase (incorrect)
Systematic name: S-sulfanylglutathione:oxygen oxidoreductase
Comments: An iron protein. Perthiols, formed spontaneously by interactions between thiols and elemental sulfur or sulfide, are the only acceptable substrate to the enzyme. The sulfite that is formed by the enzyme can be further converted into sulfate, thiosulfate or S-sulfoglutathione (GSSO3-) non-enzymically [2].
Links to other databases: BRENDA, EXPASY, KEGG, MetaCyc, PDB, CAS registry number: 37256-58-9
References:
1. Suzuki, I. and Silver, M. The initial product and properties of the sulfur-oxidizing enzyme of thiobacilli. Biochim. Biophys. Acta 122 (1966) 22-33. [PMID: 5968172]
2. Rohwerder, T. and Sand, W. The sulfane sulfur of persulfides is the actual substrate of the sulfur-oxidizing enzymes from Acidithiobacillus and Acidiphilium spp. Microbiology 149 (2003) 1699-1710. [PMID: 12855721]
3. Liu, H., Xin, Y. and Xun, L. Distribution, diversity, and activities of sulfur dioxygenases in heterotrophic bacteria. Appl. Environ. Microbiol. 80 (2014) 1799-1806. [PMID: 24389926]
4. Holdorf, M.M., Owen, H.A., Lieber, S.R., Yuan, L., Adams, N., Dabney-Smith, C. and Makaroff, C.A. Arabidopsis ETHE1 encodes a sulfur dioxygenase that is essential for embryo and endosperm development. Plant Physiol. 160 (2012) 226-236. [PMID: 22786886]
5. Pettinati, I., Brem, J., McDonough, M.A. and Schofield, C.J. Crystal structure of human persulfide dioxygenase: structural basis of ethylmalonic encephalopathy. Hum. Mol. Genet. 24 (2015) 2458-2469. [PMID: 25596185]