cytidine(4) in tRNA(Gly)(GCC) + S-adenosyl-L-methionine => 2'-O-methylcytidine(4) in tRNA(Gly)(GCC) + S-adenosyl-L-homocysteine + H(+)
cytidine(4) in trna(gly)(gcc) + s-adenosyl-l-methionine => 2'-o-methylcytidine(4) in trna(gly)(gcc) + s-adenosyl-l-homocysteine + h(+)