tRNA(Pyl) + L-pyrrolysine + ATP = L-pyrrolysyl-tRNA(Pyl) + AMP + diphosphate
trna(pyl) + l-pyrrolysine + atp = l-pyrrolysyl-trna(pyl) + amp + diphosphate
"pyrrolysyl-tRNA synthetase"
"pyrrolysyl-trna synthetase"