. "\"Interacting selectively and non-covalently with a member of the class of TATA-binding proteins (TBP), including any of the TBP-related factors (TRFs), to facilitate the aggregation, arrangement and bonding together of proteins on RNA polymerase II promoter DNA to form the transcriptional preinitiation complex (PIC), the formation of which is a prerequisite for transcription by RNA polymerase.\" [GOC:txnOH, PMID:16858867]" . . "TBP-class protein binding RNA polymerase II transcription factor activity involved in preinitiation complex assembly" . "For example, both TFIIA as well as TFIIB interact with TBP bound to DNA to stabilize formation of the preinitiation complex." . . "TATA-binding protein binding RNA polymerase II transcription factor activity involved in preinitiation complex assembly" .