Catalytic component of the NatC N-terminal acetyltransferase, which catalyzes acetylation of the N-terminus Met of L-A virus GAG protein and possibly GRH1. acetyl-CoA + N-terminal L-methionyl-L-leucyl-[protein] = CoA + H(+) + N-terminal N(alpha)-acetyl-L-methionyl-L-leucyl-[protein] acetyl-CoA + N-terminal L-methionyl-L-isoleucyl-[protein] = CoA + H(+) + N-terminal N(alpha)-acetyl-L-methionyl-L-isoleucyl-[protein] acetyl-CoA + N-terminal L-methionyl-L-phenylalanyl-[protein] = CoA + H(+) + N-terminal N(alpha)-acetyl-L-methionyl-L-phenylalanyl-[protein] acetyl-CoA + N-terminal L-methionyl-L-tryptophyl-[protein] = CoA + H(+) + N-terminal N(alpha)-acetyl-L-methionyl-L-tryptophyl-[protein] acetyl-CoA + N-terminal L-methionyl-L-tyrosyl-[protein] = CoA + H(+) + N-terminal N(alpha)-acetyl-L-methionyl-L-tyrosyl-[protein] Component of the N-terminal acetyltransferase C (NatC) complex, which is composed of MAK3, MAK10 and MAK31. Present with 1940 molecules/cell in log phase SD medium. Belongs to the acetyltransferase family. MAK3 subfamily.