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 (By similarity). Component of the RNA polymerase I (Pol I) complex. Up-regulated by phagocytic stimuli. Belongs to the eukaryotic RPA43 RNA polymerase subunit family.