N-terminal L-glutamyl-L-glutamyl-L-glutamyl-[protein] + acetyl-CoA = N-terminal N-acetyl-L-glutamyl-L-glutamyl-L-glutamyl-[protein] + CoA + H(+)
n-terminal l-glutamyl-l-glutamyl-l-glutamyl-[protein] + acetyl-coa = n-terminal n-acetyl-l-glutamyl-l-glutamyl-l-glutamyl-[protein] + coa + h(+)