DNA-directed RNA polymerase subunit alpha DNA-dependent RNA polymerase catalyzes the transcription of DNA into RNA using the four ribonucleoside triphosphates as substrates. 337 PA101 MVREEVAGSTQTLQWKCVESRVDSKRLYYGRFILSPLRKGQADTVGIALRRALLGETEGTCITHAKFGSVPHEYSTIAGIEESVQEILLNLKEIVLRSNLYGVRTASICVKGPRYITAQDIILPPSVEIVDTAQPIANLTEPTDFRIELRIKRDRGYHTEVRKNTQDGSYPIDAVSMPVRNVNYSIFACGNGNAKYEILFLEIWTNGSLTPKEALYEASRNLIDLFLPFLHTEEEGTRFQENKNRFTSPLLSFQKRLTNLKKNKKRIPLNCIFIDQLELPSRTYNCLKRANIHTLLDLLSKTEEDLMRIDSFRMQDGKQIWDTLEKHLPMDLPKNKF RPOA_ORYSA rpoA Plastid-encoded RNA polymerase subunit alpha