DNA-dependent RNA polymerase catalyzes the transcription of DNA into RNA using the four ribonucleoside triphosphates as substrates. Component of RNA polymerase I which synthesizes ribosomal RNA precursors. May be involved in recruitment of Pol I to rDNA promoters (By similarity). Component of the RNA polymerase I (Pol I) complex consisting of at least 13 subunits. Belongs to the eukaryotic RPA43 RNA polymerase subunit family.