TAFs are components of the transcription factor IID (TFIID) complex that is essential for mediating regulation of RNA polymerase transcription. Component of the TFIID complex. TFIID is composed of TATA binding protein (TBP) and a number of TBP-associated factors (TAFs) whose MWs range from 14-217 kDa. Interacts with TAF5, TAF10, TAF12, TAF12B, TAF15 and TAF15B. Expressed in roots, leaves and inflorescences. Belongs to the TAF4 family.