DNA-dependent RNA polymerase catalyzes the transcription of DNA into RNA using the four ribonucleoside triphosphates as substrates. Specific peripheric component of RNA polymerase III which synthesizes small RNAs, such as 5S rRNA and tRNAs. Component of the RNA polymerase III (Pol III) complex consisting of 17 subunits (By similarity). Found a trimeric complex with POLR3C and POLR3G. Directly interacts with POLR3C (By similarity). Expressed in the liver. Belongs to the eukaryotic RPC7 RNA polymerase subunit family.