label: a 5'-end adenosine-5'-diphospho-5'-ribonucleotide-tRNA(His) + GTP <=> a 5'-end triphospho-guanosine-ribonucleotide-tRNA(His) + AMP + H(+)
label_lc: a 5'-end adenosine-5'-diphospho-5'-ribonucleotide-trna(his) + gtp <=> a 5'-end triphospho-guanosine-ribonucleotide-trna(his) + amp + h(+)