N(4)-acetylcytidine(34) in elongator tRNA(Met) + AMP + diphosphate => cytidine(34) in elongator tRNA(Met) + acetate + ATP
n(4)-acetylcytidine(34) in elongator trna(met) + amp + diphosphate => cytidine(34) in elongator trna(met) + acetate + atp