POLR2B

POLR2B
Available structures PDB Ortholog search: PDBe RCSB List of PDB id codes 5IY9, 5IYA, 5IYC, 5IYB, 5IY7, 5IY8, 5IYD, 5IY6
Identifiers
Aliases	POLR2B, POL2RB, RPB2, hRPB140, hsRPB2, polymerase (RNA) II subunit B
External IDs	MGI: 2388280 HomoloGene: 722 GeneCards: POLR2B
Gene ontology Molecular function • transferase activity • DNA binding • nucleotidyltransferase activity • ribonucleoside binding • RNA polymerase II activity • chromatin binding • metal ion binding • DNA-directed 5'-3' RNA polymerase activity • protein binding • poly(A) RNA binding Cellular component • membrane • nucleoplasm • DNA-directed RNA polymerase II, core complex • nucleus • nuclear chromosome, telomeric region Biological process • mRNA splicing, via spliceosome • gene expression • somatic stem cell population maintenance • transcription elongation from RNA polymerase II promoter • 7-methylguanosine mRNA capping • transcription from RNA polymerase II promoter • transcription, DNA-templated • positive regulation of viral transcription • gene silencing by RNA • transcription-coupled nucleotide-excision repair • transcription initiation from RNA polymerase II promoter • snRNA transcription from RNA polymerase II promoter • fibroblast growth factor receptor signaling pathway Sources:Amigo / QuickGO
RNA expression pattern
More reference expression data
Orthologs
Species	Human	Mouse
Entrez	5431	231329
Ensembl	ENSG00000047315	ENSMUSG00000029250
UniProt	P30876	Q8CFI7
RefSeq (mRNA)	NM_001303269 NM_000938 NM_001303268	NM_153798
RefSeq (protein)	NP_000929.1 NP_001290197.1 NP_001290198.1	NP_722493.2
Location (UCSC)	Chr 4: 56.98 – 57.03 Mb	Chr 5: 77.31 – 77.35 Mb
PubMed search	[1]	[2]
Wikidata

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DNA-directed RNA polymerase II subunit RPB2 is an enzyme that in humans is encoded by the POLR2B gene.^[3][4]

This gene encodes the second largest subunit of RNA polymerase II, the polymerase responsible for synthesizing messenger RNA in eukaryotes. This subunit, in combination with at least two other polymerase subunits, forms a structure within the polymerase that maintains contact in the active site of the enzyme between the DNA template and the newly synthesized RNA.^[5]

Interactions

POLR2B has been shown to interact with POLR2C,^[6] POLR2E,^[6] POLR2H^[6] and POLR2L.^[6]

References

1. "Human PubMed Reference:".
2. "Mouse PubMed Reference:".
3. Acker J, Wintzerith M, Vigneron M, Kedinger C (October 1992). "Primary structure of the second largest subunit of human RNA polymerase II (or B)". J Mol Biol. 226 (4): 1295–9. doi:10.1016/0022-2836(92)91071-V. PMID 1518060.
4. Acker J, Mattei MG, Wintzerith M, Roeckel N, Depetris D, Vigneron M, Kedinger C (August 1994). "Chromosomal localization of human RNA polymerase II subunit genes". Genomics. 20 (3): 496–9. doi:10.1006/geno.1994.1208. PMID 8034326.
5. "Entrez Gene: POLR2B polymerase (RNA) II (DNA directed) polypeptide B, 140kDa".
6. Acker, J; de Graaff M; Cheynel I; Khazak V; Kedinger C; Vigneron M (July 1997). "Interactions between the human RNA polymerase II subunits". J. Biol. Chem. UNITED STATES. 272 (27): 16815–21. doi:10.1074/jbc.272.27.16815. ISSN 0021-9258. PMID 9201987.

Further reading

• Jeang KT (1998). "Tat, Tat-associated kinase, and transcription.". J. Biomed. Sci. 5 (1): 24–7. doi:10.1007/BF02253352. PMID 9570510.
• Yankulov K, Bentley D (1998). "Transcriptional control: Tat cofactors and transcriptional elongation.". Curr. Biol. 8 (13): R447–9. doi:10.1016/S0960-9822(98)70289-1. PMID 9651670.
• Romano G, Kasten M, De Falco G, et al. (2000). "Regulatory functions of Cdk9 and of cyclin T1 in HIV tat transactivation pathway gene expression". J. Cell. Biochem. 75 (3): 357–68. doi:10.1002/(SICI)1097-4644(19991201)75:3<357::AID-JCB1>3.0.CO;2-K. PMID 10536359.
• Marcello A, Zoppé M, Giacca M (2002). "Multiple modes of transcriptional regulation by the HIV-1 Tat transactivator". IUBMB Life. 51 (3): 175–81. doi:10.1080/152165401753544241. PMID 11547919.
• Stevens M, De Clercq E, Balzarini J (2007). "The regulation of HIV-1 transcription: molecular targets for chemotherapeutic intervention". Med Res Rev. 26 (5): 595–625. doi:10.1002/med.20081. PMID 16838299.
• Harrich D, McMillan N, Munoz L, et al. (2007). "Will diverse Tat interactions lead to novel antiretroviral drug targets?". Current drug targets. 7 (12): 1595–606. doi:10.2174/138945006779025338. PMID 17168834.
• Kato H, Sumimoto H, Pognonec P, et al. (1992). "HIV-1 Tat acts as a processivity factor in vitro in conjunction with cellular elongation factors". Genes Dev. 6 (4): 655–66. doi:10.1101/gad.6.4.655. PMID 1559613.
• Southgate C, Zapp ML, Green MR (1990). "Activation of transcription by HIV-1 Tat protein tethered to nascent RNA through another protein". Nature. 345 (6276): 640–2. doi:10.1038/345640a0. PMID 2190099.
• Zheng XM, Black D, Chambon P, Egly JM (1990). "Sequencing and expression of complementary DNA for the general transcription factor BTF3". Nature. 344 (6266): 556–9. doi:10.1038/344556a0. PMID 2320128.
• Wu-Baer F, Sigman D, Gaynor RB (1995). "Specific binding of RNA polymerase II to the human immunodeficiency virus trans-activating region RNA is regulated by cellular cofactors and Tat". Proc. Natl. Acad. Sci. U.S.A. 92 (16): 7153–7. doi:10.1073/pnas.92.16.7153. PMC 41297. PMID 7638159.
• Herrmann CH, Rice AP (1995). "Lentivirus Tat proteins specifically associate with a cellular protein kinase, TAK, that hyperphosphorylates the carboxyl-terminal domain of the large subunit of RNA polymerase II: candidate for a Tat cofactor". J. Virol. 69 (3): 1612–20. PMC 188757. PMID 7853496.
• Andersson B, Wentland MA, Ricafrente JY, et al. (1996). "A "double adaptor" method for improved shotgun library construction". Anal. Biochem. 236 (1): 107–13. doi:10.1006/abio.1996.0138. PMID 8619474.
• Keen NJ, Gait MJ, Karn J (1996). "Human immunodeficiency virus type-1 Tat is an integral component of the activated transcription-elongation complex". Proc. Natl. Acad. Sci. U.S.A. 93 (6): 2505–10. doi:10.1073/pnas.93.6.2505. PMC 39827. PMID 8637904.
• Yang X, Herrmann CH, Rice AP (1996). "The human immunodeficiency virus Tat proteins specifically associate with TAK in vivo and require the carboxyl-terminal domain of RNA polymerase II for function". J. Virol. 70 (7): 4576–84. PMC 190394. PMID 8676484.
• Agostini I, Navarro JM, Rey F, et al. (1996). "The human immunodeficiency virus type 1 Vpr transactivator: cooperation with promoter-bound activator domains and binding to TFIIB". J. Mol. Biol. 261 (5): 599–606. doi:10.1006/jmbi.1996.0485. PMID 8800208.
• Zhou Q, Sharp PA (1996). "Tat-SF1: cofactor for stimulation of transcriptional elongation by HIV-1 Tat". Science. 274 (5287): 605–10. doi:10.1126/science.274.5287.605. PMID 8849451.
• Okamoto H, Sheline CT, Corden JL, et al. (1996). "Trans-activation by human immunodeficiency virus Tat protein requires the C-terminal domain of RNA polymerase II". Proc. Natl. Acad. Sci. U.S.A. 93 (21): 11575–9. doi:10.1073/pnas.93.21.11575. PMC 38099. PMID 8876177.
• Chun RF, Jeang KT (1996). "Requirements for RNA polymerase II carboxyl-terminal domain for activated transcription of human retroviruses human T-cell lymphotropic virus I and HIV-1". J. Biol. Chem. 271 (44): 27888–94. doi:10.1074/jbc.271.44.27888. PMID 8910388.