Definition: A DNA-dependent RNA polymerase present in bacterial, plant, and animal cells. The enzyme functions in the nucleolar structure and transcribes DNA into RNA. It has different requirements for cations and salts than RNA polymerase II and III and is not inhibited by alpha-amanitin. EC 220.127.116.11.
Other names DNA-Dependent RNA Polymerase I; Polymerase I, RNA; Polymerase A, RNA; I, RNA Polymerase; DNA Dependent RNA Polymerase I; A, RNA Polymerase; RNA Polymerase A