Methylarsonate reductase

In enzymology, a methylarsonate reductase (EC 1.20.4.2) is an enzyme that catalyzes the chemical reaction

Thus, the two substrates of this enzyme are methylarsonate and glutathione, whereas its 3 products are methylarsonite, glutathione disulfide, and H₂O.

This enzyme belongs to the family of oxidoreductases, specifically those acting on phosphorus or arsenic in donor with disulfide as acceptor. The systematic name of this enzyme class is gluthathione:methylarsonate oxidoreductase. This enzyme is also called MMA(V) reductase.