The TFIID basal transcription factor complex plays a major role in the initiation of RNA polymerase II (Pol II)-dependent transcription . 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) . 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 . The TFIID complex structure can be divided into 3 modules TFIID-A, TFIID-B, and TFIID-C . TAF3 forms the TFIID-A module together with TAF5 and TBP . Required in complex with TBPL2 for the differentiation of myoblasts into myocytes . The TAF3-TBPL2 complex replaces TFIID at specific promoters at an early stage in the differentiation process .
Subcellular locations: Nucleus