This enzyme belongs to the family of oxidoreductases, specifically those acting on a sulfur group of donor with a cytochrome as acceptor. The systematic name of this enzyme class is sulfite:ferricytochrome-c oxidoreductase. Other names in common use include sulfite cytochrome c reductase, sulfite-cytochrome c oxidoreductase, and sulfite oxidase. This enzyme participates in sulfur metabolism.

References

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Charles AM, Suzuki I (1966). "Purification and properties of sulfite:cytochrome c oxidoreductase from Thiobacillus novellus". Biochim. Biophys. Acta. 128: 522–534. doi:10.1016/0926-6593(66)90013-0.
Lu WP, Kelly DP (1984). "Properties and role of sulphite:cytochrome c oxidoreductase purified from Thiobacillus versutus (A2)". J. Gen. Microbiol. 130: 1683–1692. doi:10.1099/00221287-130-7-1683.

v t e Oxidoreductases: sulfur oxidoreductases (EC 1.8)
1.8.1: NAD or NADP	Dihydrolipoamide dehydrogenase Glutathione reductase Thioredoxin reductase
1.8.2: cytochrome	Sulfite dehydrogenase Thiosulfate dehydrogenase Flavocytochrome c sulfide dehydrogenase
1.8.3: oxygen	Sulfite oxidase
1.8.4: disulfide	Glutathione—homocystine transhydrogenase
1.8.5: quinone	Glutathione dehydrogenase (ascorbate)
1.8.98: Other, known	CoB—CoM heterodisulfide reductase
1.8.99: Other	Sulfite reductase

v t e Enzymes
Activity	Active site Binding site Catalytic triad Oxyanion hole Enzyme promiscuity Diffusion-limited enzyme Cofactor Enzyme catalysis
Regulation	Allosteric regulation Cooperativity Enzyme inhibitor Enzyme activator
Classification	EC number Enzyme superfamily Enzyme family List of enzymes
Kinetics	Enzyme kinetics Eadie–Hofstee diagram Hanes–Woolf plot Lineweaver–Burk plot Michaelis–Menten kinetics
Types	EC1 Oxidoreductases (list) EC2 Transferases (list) EC3 Hydrolases (list) EC4 Lyases (list) EC5 Isomerases (list) EC6 Ligases (list) EC7 Translocases (list)