RPB8, DNA-directed RNA polymerases I, II, and III subunit RPABC3
Also Known as
DNA-dependent RNA polymerases catalyze the transcription. of DNA into RNA using the four ribonucleoside triphosphates as substrates. Common component of RNA polymerases I, II and III which synthesize ribosomal RNA precursors, mRNA precursors and many functional non-coding RNAs, and small RNAs, such as 5S rRNA and tRNAs, respectively. Component of the RNA polymerase I (Pol I), RNA polymerase II (Pol II) and RNA polymerase III (Pol III) complexes. Component of the RNA polymerase I (Pol I) complex consisting of 14 subunits: RPA135, RPA190, RPC40, RPA14, RPB5, RPO26, RPA43, RPB8, RPA12, RPB10, RPC19, RPC10, RPA49 and RPA34. The complex is composed of a horseshoe-shaped core containing ten subunits (RPA135, RPA190, RPB5, RPO26, RPB8, RPB10, RPC10, RPA12, RPC19 and RPC40) where RPA135 and RPA190 form the DNA-binding cleft. Outside of the core, RPA14 and RPA43 form the stalk that mediates interactions with transcription initiation factors and newly synthesized RNA. Component of the RNA polymerase II (Pol II) complex consisting of 12 subunits: RPO21, RPB2, RPB3, RPB4, RPB5, RPO26, RPB7, RPB8, RPB9, RPB10 and RPC10. Component of the RNA polymerase III (Pol III) complex consisting of 17 subunits. Directly interacts with POLR2A.