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. May direct RNA Pol III binding to the TFIIIB-DNA complex. Plays a key role in sensing and limiting infection by intracellular bacteria and DNA viruses. Acts as nuclear and cytosolic DNA sensor involved in innate immune response. Can sense non-self dsDNA that serves as template for transcription into dsRNA. The non-self RNA polymerase III transcripts induce type I interferon and NF- Kappa-B through the RIG-I pathway (By similarity). Preferentially binds double-stranded DNA (dsDNA) (By similarity). Component of the RNA polymerase III (Pol III) complex consisting of 17 subunits. RPC3/POLR3C, RPC6/POLR3F and RPC7/POLR3G form a Pol III subcomplex (By similarity). Directly interacts with POLR3C (By similarity). Interacts with TBP and TFIIIB90 and GTF3C4 (By similarity). Interacts with MAF1 (By similarity). Belongs to the eukaryotic RPC34/RPC39 RNA polymerase subunit family.