DNA-directed RNA polymerase II subunit RPB1 (UniProt: P24928; also known as EC: 2.7.7.6, DNA-directed RNA polymerase II subunit A, DNA-directed RNA polymerase III largest subunit, is encoded by the POLR2A (also known as POLR2) gene (Gene ID: 5430) in human. DNA-dependent RNA polymerase II catalyzes the transcription of DNA into RNA using the four ribonucleoside triphosphates as substrates. RPB1 subunit is part of the core element with the central large cleft, the clamp element that moves to open and close the cleft and the jaws that suggested to grab the incoming DNA template. It has multiple zinc and magnesium ion binding sites and contains a repetitive C-terminal domain (CTD; aa 1593-1960) that consists of tandem repeats of the consensus sequence YSPTSPS and serves as a platform for assembly of factors that regulate transcription initiation, elongation, termination and mRNA processing. It can exist in both hypophosphorylated form, which is mainly cytosolic, and in hyperphosphorylated form. The phosphorylation of Serine 2 and 5 in the hepatapeptide repeat is achieved by Cdk7 and Cdk9. Cdk7 phosphorylation promotes transcription initiation by triggering promoter release and elongation.
Synonyms: DNA-directed RNA polymerase II subunit RPB1, EC: 2.7.7.6, RNA polymerase II subunit B1, DNA-directed RNA polymerase II subunit A, DNA-directed RNA polymerase III largest subunit, RNA-directed RNA polymerase II subunit RPB1
Application: Western Blotting Analysis: A representative lot detected RNA Polymerase II, CTD in Western Blotting applications (Patturajan, M., et. al. (1998). J Biol Chem. 273(8):4689-94; Zhang, J., et. al. (1991). J Biol Chem. 266(4):2290-6).Dot Blot Analysis: A representative lot detected RNA Polymerase II, CTD in Dot Blot applications (Thompson, N.E., et. al. (1989). J Biol Chem. 264(19):11511-20).Immunoprecipitation Analysis: A representative immunoprecipitated RNA Polymerase II, CTD in Immunoprecipitation applications (Bhaumik, S.R., et. al. (2001). Genes Dev. 15(15):1935-45).Inhibition Analysis: A representative lot inhibited the interaction of RNA Polymerase II, CTD with the transcription complex. (Thompson, N.E., et. al. (1989). J Biol Chem. 264(19):11511-20).
Other Notes: Concentration: Please refer to lot specific datasheet.