ACT_SITE 112; /note="Acyl-thioester intermediate"; /evidence="ECO:0000250|UniProtKB:P07623"; ACT_SITE 204; /note="Proton acceptor"; /evidence="ECO:0000250|UniProtKB:P07623"; ACT_SITE 206; /evidence="ECO:0000250|UniProtKB:P07623"