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. C31 is involved in the formation of the initiation complex. Component of the RNA polymerase III (Pol III) complex consisting of 17 subunits. The acidic domain is essential for its function. Belongs to the eukaryotic RPC7 RNA polymerase subunit family.