DNA-dependent RNA polymerase (RNAP) catalyzes the transcription of DNA into RNA using the four ribonucleoside triphosphates as substrates. a ribonucleoside 5'-triphosphate + RNA(n) = diphosphate + RNA(n+1) Part of the RNA polymerase complex (By similarity). Forms an Rpo3-Rpo10-Rpo11-Rpo12 complex upon coexpression (PubMed:11058130). Belongs to the archaeal Rpo11/eukaryotic RPB11/RPC19 RNA polymerase subunit family.