label: tRNA (cytidine-3-)-methyltransferase activity
label_lc: trna (cytidine-3-)-methyltransferase activity
description: "Catalysis of the reaction: a cytidine in tRNA + S-adenosyl-L-methionine = an N3-methylcytidine in tRNA + H+ + S-adenosyl-L-homocysteine."