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