N-terminal N(alpha)-acetyl-L-seryl-[ribosomal protein bL12] + CoA + H(+) => N-terminal L-seryl-[ribosomal protein bL12] + acetyl-CoA
n-terminal n(alpha)-acetyl-l-seryl-[ribosomal protein bl12] + coa + h(+) => n-terminal l-seryl-[ribosomal protein bl12] + acetyl-coa
N-terminal N(alpha)-acetyl-L-seryl-[ribosomal protein bL12] + CoA + H(+) => N-terminal L-seryl-[ribosomal protein bL12] + acetyl-CoA
n-terminal n(alpha)-acetyl-l-seryl-[ribosomal protein bl12] + coa + h(+) => n-terminal l-seryl-[ribosomal protein bl12] + acetyl-coa