label: 5-methyluridine(54) in tRNA + S-adenosyl-L-homocysteine + H(+) => uridine(54) in tRNA + S-adenosyl-L-methionine
label_lc: 5-methyluridine(54) in trna + s-adenosyl-l-homocysteine + h(+) => uridine(54) in trna + s-adenosyl-l-methionine