Predicted to enable arsenite methyltransferase activity and methylarsonite methyltransferase activity. Predicted to be involved in arsonoacetate metabolic process; methylation; and toxin metabolic process. Predicted to act upstream of or within response to arsenic-containing substance. Located in mitochondrion. Orthologous to human AS3MT (arsenite methyltransferase). [provided by Alliance of Genome Resources, Apr 2022]