label: N-terminal L-leucyl-L-aspartyl-[protein] + tRNA(Leu) + H(+) => N-terminal L-aspartyl-[protein] + L-leucyl-tRNA(Leu)
label_lc: n-terminal l-leucyl-l-aspartyl-[protein] + trna(leu) + h(+) => n-terminal l-aspartyl-[protein] + l-leucyl-trna(leu)