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In enzymology, a hydrogensulfite reductase (EC 1.8.99.3) is an enzyme that catalyzes the chemical reaction

trithionate + acceptor + 2 H₂O + OH- ${\displaystyle \rightleftharpoons }$ 3 bisulfite + reduced acceptor

The 4 substrates of this enzyme are trithionate, acceptor, H₂O, and OH-, whereas its two products are bisulfite and reduced acceptor.

This enzyme belongs to the family of oxidoreductases, specifically those acting on a sulfur group of donors with other acceptors. The systematic name of this enzyme class is trithionate:acceptor oxidoreductase. Other names in common use include bisulfite reductase, dissimilatory sulfite reductase, desulfoviridin, desulforubidin, desulfofuscidin, dissimilatory-type sulfite reductase, and trithionate:(acceptor) oxidoreductase. It has 4 cofactors: iron, sulfur, siroheme, and iron-sulfur.

References

• Hatchikian EC, Zeikus JG (1983). "Characterization of a new type of dissimilatory sulfite reductase present in Thermodesulfobacterium commune". J. Bacteriol. 153 (3): 1211–20. PMC 221765. PMID 6826522.
• Lee JP, Yi CS, LeGall J, Peck HD Jr (1973). "Isolation of a new pigment, desulforubidin, from Desulfovibrio desulfuricans (Norway strain) and its role in sulfite reduction". J. Bacteriol. 115 (1): 453–5. PMC 246260. PMID 4717523.
• Trudinger PA (1970). "Carbon monoxide-reacting pigment from Desulfotomaculum nigrificans and its possible relevance to sulfite reduction". J. Bacteriol. 104 (1): 158–70. PMC 248196. PMID 5473884.

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