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The TATA box-binding factor TFIID plays a primary role in the process of transcription initiation by RNA polymerase II and its regulation by various gene-specific factors. Here we employ a permuted binding site/gel retardation assay with recombinant yeast and human TFIID to show that this factor induces DNA bending around the TATA element. These results are consistent with the presence of G + C-rich sequence elements flanking the consensus TATA element and led to the recently confirmed suggestion that TFIID interacts with the TATA element via the minor groove. They also raise the possibility that TFIID-induced bending might facilitate promoter interactions of other general factors in the preinitiation complex or interactions between general transcription factors and regulatory factors bound at upstream sites.

Transcription factor TFIID induces DNA bending upon binding to the TATA element.