Sulfite reductase

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


 * hydrogen sulfide + acceptor + 3 H2O $$\rightleftharpoons$$ 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.