N-terminal N(alpha)-acetyl-L-methionyl-L-aspartyl-[protein] + CoA + H(+) => N-terminal L-methionyl-L-aspartyl-[protein] + acetyl-CoA
n-terminal n(alpha)-acetyl-l-methionyl-l-aspartyl-[protein] + coa + h(+) => n-terminal l-methionyl-l-aspartyl-[protein] + acetyl-coa