label: a 3-[(3S)-3-amino-3-carboxypropyl]uridine in tRNA + S-methyl-5'-thioadenosine + H(+) => a uridine in tRNA + S-adenosyl-L-methionine
label_lc: a 3-[(3s)-3-amino-3-carboxypropyl]uridine in trna + s-methyl-5'-thioadenosine + h(+) => a uridine in trna + s-adenosyl-l-methionine