Reaction: sulfite + a quinone + H2O = sulfate + a quinol
Other name(s): soeABC (gene names)
Systematic name: sulfite:quinone oxidoreductase
Comments: This membrane-bound bacterial enzyme catalyses the direct oxidation of sulfite to sulfate in the cytoplasm. The enzyme, characterized from the bacteria Ruegeria pomeroyi and Allochromatium vinosum, is a complex that consists of a membrane anchor (SoeC) and two cytoplasmic subunits: an iron-sulfur protein (SoeB) and a molybdoprotein that contains a [4Fe-4S] iron-sulfur cluster (SoeA). cf. EC 126.96.36.199, sulfite dehydrogenase (cytochrome).
Links to other databases: BRENDA, EXPASY, KEGG, Metacyc, CAS registry number:
1. Dahl, C., Franz, B., Hensen, D., Kesselheim, A. and Zigann, R. Sulfite oxidation in the purple sulfur bacterium Allochromatium vinosum: identification of SoeABC as a major player and relevance of SoxYZ in the process. Microbiology 159 (2013) 2626-2638. [PMID: 24030319]