Reaction: sulfite + hydrogen sulfide + 2 ferricytochrome c3 = thiosulfate + 2 ferrocytochrome c3
Systematic name: sulfite,hydrogen sulfide:ferricytochrome-c3 oxidoreductase (thiosulfate-forming)
Comments: The enzyme is found in sulfate-reducing bacteria. The source of the electrons is molecular hydrogen, via EC 1.12.2.1, cytochrome-c3 hydrogenase. The organisms utilize the sulfite that is produced for energy generation by EC 1.8.99.5, dissimilatory sulfite reductase.
Links to other databases: BRENDA, EXPASY, KEGG, MetaCyc, CAS registry number:
References:
1. Ishimoto, M. and Koyama, J. On the role of a cytochrome in the thiosulfate reduction by sulfate-reducing bacterium. B. Chem. Soc. Jpn. 28 (1955) 231b-232.
2. Ishimoto, M., Toyama, J. Biochemical studies on sulfate reducing bacteria. VI. Separation of hydrogenase and thiosulfate reductase and partial purification of cytochrome and green pigment. J. Biochem. (Tokyo) 44 (1957) 233-242.
3. Nakatsukasa, W. and Akagi, J.M. Thiosulfate reductase isolated from Desulfotomaculum nigrificans. J. Bacteriol. 98 (1969) 429-433. [PMID: 5784203]
4. Haschke, R.H. and Campbell, L.L. Thiosulfate reductase of Desulfovibrio vulgaris. J. Bacteriol. 106 (1971) 603-607. [PMID: 5573735]
5. Hatchikian, E.C. Purification and properties of thiosulfate reductase from Desulfovibrio gigas. Arch. Microbiol. 105 (1975) 249-256. [PMID: 242299]
6. Aketagawa, J., Kobayashi, K. and Ishimoto, M. Purification and properties of thiosulfate reductase from Desulfovibrio vulgaris, Miyazaki F. J. Biochem. 97 (1985) 1025-1032. [PMID: 2993256]