Catalyzes the hydrolysis of N-acetylated amino acids to acetate and free amino acids. an N-acyl-L-amino acid + H2O = a carboxylate + an L-alpha-amino acid H2O + N(alpha)-acetyl-L-methionine = acetate + L-methionine H2O + N-acetyl-L-glutamine = acetate + L-glutamine Binds 2 Zn(2+) ions per subunit. Homodimer (By similarity). Interacts with SPHK1 (By similarity). Belongs to the peptidase M20A family.