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 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). Component of the TFIID basal transcription factor complex, composed of TATA-box-binding protein tbp, and a number of TBP-associated factors (TAFs). Component of the TATA-binding protein-free TAF complex (TFTC), the PCAF histone acetylase complex and the STAGA transcription coactivator-HAT complex. Belongs to the TAF12 family.