Transcription initiation factor TFIID, 23-30kDa subunit (IPR003923)

Short name: TFIID_30kDa

Overlapping homologous superfamilies


Family relationships



Transcription initiation factor TFIID is a multimeric protein complex that plays a central role in mediating promoter responses to various activators and repressors. The complex includes TATA binding protein (TBP) and various TBP-associated factors (TAFS). TFIID is a bona fide RNA polymerase II-specific TATA-binding protein-associated factor (TAF) and is essential for viability [PMID: 8662725]. This entry represents one of the TAFs, TAF10.

TFIID acts to nucleate the transcription complex, recruiting the rest of the factors through a direct interaction with TFIIB. The TBP subunit of TFIID is sufficient for TATA-element binding and TFIIB interaction, and can support basal transcription. The protein belongs to the TAF2H family.

TAF10 is part of other transcription regulatory multiprotein complexes (e.g., SAGA, TBP-free TAF-containing complex [TFTC], STAGA, and PCAF/GCN5). Several TAFs interact via histone-fold motifs. The histone fold (HFD) is the interaction motif involved in heterodimerization of the core histones and their assembly into nucleosome octamer. The minimal HFD contains three alpha-helices linked by two loops. The HFD is found in core histones, TAFs and many other transcription factors. Five HF-containing TAF pairs have been described in TFIID: TAF6-TAF9, TAF4-TAF12, TAF11-TAF13, TAF8-TAF10 and TAF3-TAF10 [PMID: 16858867, PMID: 15870280, PMID: 17375202].

GO terms

Biological Process

GO:0006352 DNA-templated transcription, initiation

Molecular Function

No terms assigned in this category.

Cellular Component

GO:0005634 nucleus

Contributing signatures

Signatures from InterPro member databases are used to construct an entry.