Recombinant Human Transcription initiation factor TFIID subunit 9 (TAF9)

Function

The TFIID basal transcription factor complex plays a major role in the initiation of RNA polymerase II (Pol II)-dependent transcription (PubMed:33795473). TFIID recognizes and binds promoters with or without a TATA box via its subunit TBP, a TATA-box-binding protein, and promotes assembly of the pre-initiation complex (PIC) (PubMed:33795473). The TFIID complex consists of TBP and TBP-associated factors (TAFs), including TAF1, TAF2, TAF3, TAF4, TAF5, TAF6, TAF7, TAF8, TAF9, TAF10, TAF11, TAF12 and TAF13 (PubMed:33795473). TAF9 is also a component of the TBP-free TAFII complex (TFTC), the PCAF histone acetylase complex and the STAGA transcription coactivator-HAT complex (PubMed:15899866). TAF9 and its paralog TAF9B are involved in transcriptional activation as well as repression of distinct but overlapping sets of genes (PubMed:15899866). Essential for cell viability (PubMed:15899866). May have a role in gene regulation associated with apoptosis (PubMed:15899866)

Subcellular Location

Nucleus

Subunit

Component of the TFIID basal transcription factor complex, composed of TATA-box-binding protein TBP, and a number of TBP-associated factors (TAFs), including TAF1, TAF2, TAF3, TAF4, TAF5, TAF6, TAF7, TAF8, TAF9, TAF10, TAF11, TAF12 and TAF13 (PubMed:33795473). Component of the TATA-binding protein-free TAF complex (TFTC), the PCAF histone acetylase complex and the STAGA transcription coactivator-HAT complex (PubMed:11564863, PubMed:9885574). The PCAF complex consists at least of TADA2L/ADA2, SUPT3H/SPT3, TADA3L/ADA3, TAF5L/PAF65-beta, TAF6L/PAF65-alpha, TAF10/TAFII30, TAF12/TAFII20, TAF9/TAFII31 and TRRAP (PubMed:9674425, PubMed:9885574). The STAGA transcription coactivator-HAT complex consists at least of SUPT3H, GCN5L2, SUPT7L, TAF5L, TAF6L, TADA3L, TAD1L, TAF10, TAF12, TRRAP and TAF9 (PubMed:11564863). Binds N-terminal domain of p53/TP53 which is essential for transcription (PubMed:7761466). Component of some MLL1/MLL complex, at least composed of the core components KMT2A/MLL1, ASH2L, HCFC1/HCF1, WDR5 and RBBP5, as well as the facultative components BACC1, CHD8, E2F6, HSP70, INO80C, KANSL1, LAS1L, MAX, MCRS1, MGA, MYST1/MOF, PELP1, PHF20, PRP31, RING2, RUVB1/TIP49A, RUVB2/TIP49B, SENP3, TAF1, TAF4, TAF6, TAF7, TAF9 and TEX10 (PubMed:15960975). Binds TFIIB and the Herpes simplex virus activator VP16 (PubMed:7761466). Forms a heterodimer with TAF6 in a complex with the TAF4B-TAF12 heterodimer (PubMed:15601843, PubMed:7597030). Also interacts with TAF5 (PubMed:15899866). Binds directly DNA (PubMed:15601843). Increased DNA binding when complexed with TAF6 (PubMed:15601843)

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