TRNAMet cytidine acetyltransferase (, YpfI, TmcA) is an enzyme with systematic name acetyl-CoA:(elongator tRNAMet)-cytidine<sup>34</sup> N<sup>4</sup>-acetyltransferase (ATP-hydrolysing). This enzyme catalyses the following chemical reaction
The enzyme acetylates the wobble base C<sup>34</sup> of the CAU anticodon of elongation-specific tRNAMet.