Acetylation is an important modification of proteins in cell biology. N-acetylation, or the transfer of an acetyl group to nitrogen, occurs in almost all eukaryotic proteins through both irreversible and reversible mechanisms. N-terminal acetylation requires the cleavage of the N-terminal methionine by methionine aminopeptidase (MAP) before replacing the amino acid with an acetyl group from acetyl-CoA by N-acetyltransferase (NAT) enzymes. It occurs as a co-translational and post-translational modification of proteins, for example, histones, STAT, and microtubules. 	Protein N-acetylation	https://www.creative-proteomics.com/services/n-acetylation.htm