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Transcription initiation factor TFIID subunit 1, also known as transcription initiation factor TFIID 250 kDa subunit (TAFII-250) or TBP-associated factor 250 kDa (p250), is a protein that in humans is encoded by the TAF1gene.[1][2]
Initiation of transcription by RNA polymerase II requires the activities of more than 70 polypeptides. The protein that coordinates these activities is the basal transcription factor TFIID, which binds to the core promoter to position the polymerase properly, serves as the scaffold for assembly of the remainder of the transcription complex, and acts as a channel for regulatory signals. TFIID is composed of the TATA-binding protein (TBP) and a group of evolutionarily conserved proteins known as TBP-associated factors or TAFs. TAFs may participate in basal transcription, serve as coactivators, function in promoter recognition or modify general transcription factors (GTFs) to facilitate complex assembly and transcription initiation. This gene encodes the largest subunit of TFIID. This subunit binds to core promoter sequences encompassing the transcription start site. It also binds to activators and other transcriptional regulators, and these interactions affect the rate of transcription initiation. This subunit contains two independent protein kinase domains at the N and C-terminals, but also possesses acetyltransferase activity and can act as a ubiquitin-activating/conjugating enzyme. Two transcripts encoding different isoforms have been identified for this gene.[1]
Histones are often acetylated to open DNA for transcription. TAF1 contains two bromodomains, which each can bind one of two acetyllysine residues at position 5 and 12 in the H4 tail, to stabilize the TBP-TATA box complex.
Clinical significance
A mutation in TAF1 was identified that contributes to a phenotype with severe intellectual disability (ID), a characteristic intergluteal crease, and distinctive facial features, including a broad, upturned nose, sagging cheeks, downward sloping palpebral fissures, prominent periorbital ridges, deep-set eyes, relative hypertelorism, thin upper lip, a high-arched palate, prominent ears with thickened helices, and a pointed chin[3][4] This is a non-synonymous change in TAF1 that results in an isoleucine (hydrophobic) to threonine (polar) change on the 1337th amino acid residue in the protein (NP_001273003.1). Two other mutations were reported in TAF1 in two families with intellectual disability, although further clinical details were not reported.[5]
↑Sekiguchi T, Yoshida MC, Sekiguchi M, Nishimoto T (April 1987). "Isolation of a human X chromosome-linked gene essential for progression from G1 to S phase of the cell cycle". Exp. Cell Res. 169 (2): 395–407. doi:10.1016/0014-4827(87)90200-X. PMID3556424.
↑Hu H, Haas SA, Chelly J, Van Esch H, Raynaud M, de Brouwer AP, Weinert S, Froyen G, Frints SG, Laumonnier F, Zemojtel T, Love MI, Richard H, Emde AK, Bienek M, Jensen C, Hambrock M, Fischer U, Langnick C, Feldkamp M, Wissink-Lindhout W, Lebrun N, Castelnau L, Rucci J, Montjean R, Dorseuil O, Billuart P, Stuhlmann T, Shaw M, Corbett MA, Gardner A, Willis-Owen S, Tan C, Friend KL, Belet S, van Roozendaal KE, Jimenez-Pocquet M, Moizard MP, Ronce N, Sun R, O'Keeffe S, Chenna R, van Bömmel A, Göke J, Hackett A, Field M, Christie L, Boyle J, Haan E, Nelson J, Turner G, Baynam G, Gillessen-Kaesbach G, Müller U, Steinberger D, Budny B, Badura-Stronka M, Latos-Bieleńska A, Ousager LB, Wieacker P, Rodríguez Criado G, Bondeson ML, Annerén G, Dufke A, Cohen M, Van Maldergem L, Vincent-Delorme C, Echenne B, Simon-Bouy B, Kleefstra T, Willemsen M, Fryns JP, Devriendt K, Ullmann R, Vingron M, Wrogemann K, Wienker TF, Tzschach A, van Bokhoven H, Gecz J, Jentsch TJ, Chen W, Ropers HH, Kalscheuer VM (Feb 2015). "X-exome sequencing of 405 unresolved families identifies seven novel intellectual disability genes". Molecular Psychiatry. 21: 133–48. doi:10.1038/mp.2014.193. PMID25644381.
↑Allende-Vega N, McKenzie L, Meek D (September 2008). "Transcription factor TAFII250 phosphorylates the acidic domain of Mdm2 through recruitment of protein kinase CK2". Mol. Cell. Biochem. 316 (1–2): 99–106. doi:10.1007/s11010-008-9816-3. PMID18548200.
↑Adnane J, Shao Z, Robbins PD (January 1999). "Cyclin D1 associates with the TBP-associated factor TAF(II)250 to regulate Sp1-mediated transcription". Oncogene. 18 (1): 239–47. doi:10.1038/sj.onc.1202297. PMID9926939.
↑Dikstein R, Ruppert S, Tjian R (March 1996). "TAFII250 is a bipartite protein kinase that phosphorylates the base transcription factor RAP74". Cell. 84 (5): 781–90. doi:10.1016/s0092-8674(00)81055-7. PMID8625415.
↑Ruppert S, Tjian R (November 1995). "Human TAFII250 interacts with RAP74: implications for RNA polymerase II initiation". Genes Dev. 9 (22): 2747–55. doi:10.1101/gad.9.22.2747. PMID7590250.
↑Ruppert S, Wang EH, Tjian R (March 1993). "Cloning and expression of human TAFII250: a TBP-associated factor implicated in cell-cycle regulation". Nature. 362 (6416): 175–9. doi:10.1038/362175a0. PMID7680771.
↑Lin CY, Tuan J, Scalia P, Bui T, Comai L (Dec 2002). "The cell cycle regulatory factor TAF1 stimulates ribosomal DNA transcription by binding to the activator UBF". Curr. Biol. 12 (24): 2142–6. doi:10.1016/s0960-9822(02)01389-1. PMID12498690.
Further reading
Wassarman DA, Sauer F (2001). "TAF(II)250: a transcription toolbox". J. Cell Sci. 114 (Pt 16): 2895–902. PMID11686293.
Ha I, Lane WS, Reinberg D (1991). "Cloning of a human gene encoding the general transcription initiation factor IIB". Nature. 352 (6337): 689–95. doi:10.1038/352689a0. PMID1876184.
Sekiguchi T, Yoshida MC, Sekiguchi M, Nishimoto T (1987). "Isolation of a human X chromosome-linked gene essential for progression from G1 to S phase of the cell cycle". Exp. Cell Res. 169 (2): 395–407. doi:10.1016/0014-4827(87)90200-X. PMID3556424.
Ruppert S, Tjian R (1995). "Human TAFII250 interacts with RAP74: implications for RNA polymerase II initiation". Genes Dev. 9 (22): 2747–55. doi:10.1101/gad.9.22.2747. PMID7590250.
Ruppert S, Wang EH, Tjian R (1993). "Cloning and expression of human TAFII250: a TBP-associated factor implicated in cell-cycle regulation". Nature. 362 (6416): 175–9. doi:10.1038/362175a0. PMID7680771.
Parada CA, Yoon JB, Roeder RG (1995). "A novel LBP-1-mediated restriction of HIV-1 transcription at the level of elongation in vitro". J. Biol. Chem. 270 (5): 2274–83. doi:10.1074/jbc.270.5.2274. PMID7836461.
Jacq X, Brou C, Lutz Y, Davidson I, Chambon P, Tora L (1994). "Human TAFII30 is present in a distinct TFIID complex and is required for transcriptional activation by the estrogen receptor". Cell. 79 (1): 107–17. doi:10.1016/0092-8674(94)90404-9. PMID7923369.
Sun X, Ma D, Sheldon M, Yeung K, Reinberg D (1994). "Reconstitution of human TFIIA activity from recombinant polypeptides: a role in TFIID-mediated transcription". Genes Dev. 8 (19): 2336–48. doi:10.1101/gad.8.19.2336. PMID7958900.
Kashanchi F, Piras G, Radonovich MF, Duvall JF, Fattaey A, Chiang CM, Roeder RG, Brady JN (1994). "Direct interaction of human TFIID with the HIV-1 transactivator tat". Nature. 367 (6460): 295–9. doi:10.1038/367295a0. PMID8121496.
Nakashima T, Sekiguchi T, Sunamoto H, Yura K, Tomoda S, Go M, Kere J, Schlessinger D, Nishimoto T (1994). "Structure of the human CCG1 gene: relationship between the exons/introns and functional domain/modules of the protein". Gene. 141 (2): 193–200. doi:10.1016/0378-1119(94)90570-3. PMID8163188.
Ma D, Watanabe H, Mermelstein F, Admon A, Oguri K, Sun X, Wada T, Imai T, Shiroya T, Reinberg D (1993). "Isolation of a cDNA encoding the largest subunit of TFIIA reveals functions important for activated transcription". Genes Dev. 7 (11): 2246–57. doi:10.1101/gad.7.11.2246. PMID8224850.
