Sulfite reductase

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In enzymology, a sulfite reductase (EC is an enzyme that catalyzes the chemical reaction

hydrogen sulfide + acceptor + 3 H2O sulfite + reduced acceptor

The 3 substrates of this enzyme are hydrogen sulfide, acceptor, and H2O, whereas its two products are sulfite 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 hydrogen-sulfide:acceptor oxidoreductase. Other names in common use include assimilatory sulfite reductase, assimilatory-type sulfite reductase, and hydrogen-sulfide:(acceptor) oxidoreductase. This enzyme participates in selenoamino acid metabolism and sulfur metabolism. It employs one cofactor, iron.


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  • Asada K (1967). "Purification and properties of a sulfite reductase from leaf tissue". J. Biol. Chem. 242: 3646&ndash, 54. PMID 6038492.
  • Asada K, Tamura G, Bandurski RS (1969). "Methyl viologen-linked sulfite reductase from spinach leaves". J. Biol. Chem. 244: 4904&ndash, 15. PMID 5824566.
  • Yoshimoto A, Nakamura T, Sato R (Tokyo). "Isolation from Aspergillus nidulans, of a protein catalyzing the reduction of sulfite by reduced viologen dyes". J. Biochem.: 756&ndash, 66. PMID 5589532. Check date values in: |date= (help)

External links

The CAS registry number for this enzyme class is 37256-51-2.

Gene Ontology (GO) codes