Arsenite methyltransferase

Arsenite methyltransferase (EC 2.1.1.137, S-adenosyl-L-methionine:arsenic(III) methyltransferase, S-adenosyl-L-methionine:methylarsonite As-methyltransferase, methylarsonite methyltransferase) is an enzyme with systematic name S-adenosyl-L-methionine:arsenite As-methyltransferase. This enzyme catalyses the following chemical reaction

(1) S-adenosyl-L-methionine + arsenite ⇌ S-adenosyl-L-homocysteine + methylarsonate (2) S-adenosyl-L-methionine + methylarsonite ⇌ S-adenosyl-L-homocysteine + dimethylarsinate

An enzyme of the biotransformation pathway that forms dimethylarsinate from inorganic arsenite and arsenate.