An assembly of RNA polymerase and associated factors at a gene promoter before productive RNA synthesis. Its positioning and opening of template DNA help determine initiation.
A general transcription factor complex containing activities involved in promoter opening and regulation of RNA polymerase II; some components also function in DNA repair.
A DNA translocase component of TFIIH involved in opening RNA polymerase II gene promoters. It is a molecular target of triptolide.[ref]
A general transcription factor contributing to assembly and positioning of RNA polymerase II in the preinitiation complex.
A general transcription factor complex containing TATA-binding protein and associated subunits, involved in recognition and assembly at many RNA polymerase II core promoters.

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