General transcription factor that functions at the core of the DNA-binding multiprotein factor TFIID (Probable). Binding of TFIID to the TATA box is the initial transcriptional step of the pre-initiation complex (PIC), playing a role in the activation of eukaryotic genes transcribed by RNA polymerase II (By similarity). Belongs to the TFIID complex together with the TBP-associated factors (TAFs). Binds DNA as monomer (By similarity). Interacts with RF2A and TFIIB (PubMed:11971135). Interacts with CWZF7 (PubMed:28818372). Belongs to the TBP family.