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