The general transcription factor, TFIID, consists of the TATA-binding protein (TBP) associated with a series of TBP-associated factors (TAFs) that together participate in the assembly of the transcription preinitiation complex. TAFII55 binds to TAFII250 and inhibits it acetyltransferase activity. The exact role of TAFII55 is currently unknown. The conserved region is situated towards the N-terminus of the protein [1].

1: TAFII55 binding to TAFII250 inhibits its acetyltransferase activity. Gegonne A, Weissman JD, Singer DS; Proc Natl Acad Sci U S A 2001;98:12432-12437. PMID:11592977