L-seryl-tRNA(Sec) + AMP + diphosphate + H(+) => tRNA(Sec) + L-serine + ATP
l-seryl-trna(sec) + amp + diphosphate + h(+) => trna(sec) + l-serine + atp
L-seryl-tRNA(Sec) + AMP + diphosphate + H(+) => tRNA(Sec) + L-serine + ATP
l-seryl-trna(sec) + amp + diphosphate + h(+) => trna(sec) + l-serine + atp