Initiation of transcription by RNA polymerase II requires the activities of more than 70 polypeptides. The protein that coordinates these activities is transcription factor IID (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 one of the smaller subunits of TFIID that binds weakly to TBP but strongly to TAF1, the largest subunit of TFIID. Alternative splicing results in multiple transcript variants. [provided by RefSeq, Jun 2010]
Function:
TAFs are components of the transcription factor IID (TFIID) complex, PCAF histone acetylase complex and TBP-free TAFII complex (TFTC). TIIFD is multimeric protein complex that plays a central role in mediating promoter responses to various activators and repressors.
Subunit:
TFIID and PCAF are composed of TATA binding protein (TBP) and a number of TBP-associated factors (TAFs). TBP is not part of TFTC. Interacts directly with TBP, TAF1/TAFII250, TAF9/TAFII31 AND TAF12/TAFII20. The TAF6/TAFII70-TAF9/TAFII31 heterodimer forms an octamer complex with the TAF4B/TFII105-TAF12/TFIID20 heterodimer. 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 BAP18, 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. Also interacts with the GTFs, TFIIEalpha/GTF2E1 and TFIIFalpha/GTF2F1. Component of the TFTSLCHAT complex.
Subcellular Location:
Nuclear.
Similarity:
Belongs to the TAF6 family.
SWISS:
P49848
Gene ID:
6878
Database links:
Entrez Gene: 505638 Cow
Entrez Gene: 6878 Human
Entrez Gene: 21343 Mouse
Entrez Gene: 288533 Rat
Entrez Gene: 447818 Zebrafish
Omim: 602955 Human
SwissProt: Q58DG7 Cow
SwissProt: P49848 Human
SwissProt: Q62311 Mouse
SwissProt: Q498R0 Rat
SwissProt: Q63801 Rat
Unigene: 489309 Human
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