EC 1.8.2.1     
Accepted name: sulfite dehydrogenase (cytochrome)
Reaction: sulfite + 2 ferricytochrome c + H2O = sulfate + 2 ferrocytochrome c + 2 H+
Other name(s): sulfite cytochrome c reductase; sulfite-cytochrome c oxidoreductase; sulfite oxidase (ambiguous); sulfite dehydrogenase (ambiguous); sorAB (gene names)
Systematic name: sulfite:ferricytochrome-c oxidoreductase
Comments: Associated with cytochrome c-551. The enzyme from the bacterium Starkeya novella contains a molybdopyranopterin cofactor and a smaller monoheme cytochrome c subunit. cf. EC 1.8.5.6, sulfite dehydrogenase (quinone).
References:
1.  Charles, A.M. and Suzuki, I. Purification and properties of sulfite:cytochrome c oxidoreductase from Thiobacillus novellus. Biochim. Biophys. Acta 128 (1966) 522–534.
2.  Lyric, R.M. and Suzuki, I. Enzymes involved in the metabolism of thiosulfate by Thiobacillus thioparus. I. Survey of enzymes and properties of sulfite: cytochrome c oxidoreductase. Can. J. Biochem. 48 (1970) 334–343. [PMID: 5438321]
3.  Yamanaka, T., Yoshioka, T. and Kimura, K. Purification of sulphite cytocrome c reductase of Thiobacillus novellus and reconstitution of its sulphite oxidase system with the purified constituents. Plant and Cell Physiol. 22 (1981) 631.
4.  Lu, W.-P. and Kelly, D.P. Properties and role of sulphite:cytochrome c oxidoreductase purified from Thiobacillus versutus (A2). J. Gen. Microbiol. 130 (1984) 1683–1692.
5.  Kappler, U., Bennett, B., Rethmeier, J., Schwarz, G., Deutzmann, R., McEwan, A.G. and Dahl, C. Sulfite:Cytochrome c oxidoreductase from Thiobacillus novellus. Purification, characterization, and molecular biology of a heterodimeric member of the sulfite oxidase family. J. Biol. Chem. 275 (2000) 13202–13212. [PMID: 10788424]
[EC 1.8.2.1 created 1972, modified 2016]
 
 


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