label: tRNA (adenine(9)-N1)-methyltransferase activity
label_lc: trna (adenine(9)-n1)-methyltransferase activity
description: "Catalysis of the reaction: adenosine(9) in tRNA + S-adenosyl-L-methionine = H+ + N(1)-methyladenosine(9) in tRNA + S-adenosyl-L-homocysteine."