adenosine(9) in tRNA + S-adenosyl-L-methionine => N(1)-methyladenosine(9) in tRNA + S-adenosyl-L-homocysteine + H(+)
adenosine(9) in trna + s-adenosyl-l-methionine => n(1)-methyladenosine(9) in trna + s-adenosyl-l-homocysteine + h(+)