DNA-dependent RNA polymerase catalyzes the transcription of DNA into RNA using the four ribonucleoside triphosphates as substrates. Specific component of RNA polymerase III which synthesizes small RNAs, such as 5S rRNA and tRNAs (By similarity). Accessory protein for the calcitonin gene-related peptide (CGRP) receptor. It modulates CGRP responsiveness in a variety of tissues. Component of the RNA polymerase III (Pol III) complex consisting of 17 subunits. Interacts with POLR3H/RPC8. POLR3H/RPC8 and CRCP/RPC9 probably form a Pol III subcomplex (By similarity). Belongs to the eukaryotic RPC9 RNA polymerase subunit family.