Catalyzes the transfer of an acetyl group from acetyl coenzyme A (AcCoA) to an acceptor substrate and releases both CoA and the acetylated product. It prefers the peptide Asp-Phe methyl ester (or aspartame) and the peptide antibiotics polymyxin B and colistin. Other substrates like dopamine, serotonin, puromycin, chloramphenicol, D-glucosamine, glycine and N-alpha-acetyl-L-glutamine are used and displayed lower activity.