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Interaction of the Dr1 inhibitory factor with the TATA binding protein is disrupted by adenovirus E1A

, : Interaction of the Dr1 inhibitory factor with the TATA binding protein is disrupted by adenovirus E1A. Proceedings of the National Academy of Sciences of the United States of America 91(14): 6279-6282

Past experiments have shown that the adenovirus E1A-12S product activates the hsp70 promoter, dependent on the TATA element and dependent on N-terminal E1A sequences. Other experiments have identified a factor termed Dr1 that interacts with and inhibits the transcriptional activity of the TATA-binding protein (TBP). We now rind that the E1A-12S protein can disrupt the interaction of the Dr1 factor with the TATA-specific TBP factor, allowing the productive interaction of TBP with TFIIA. This E1A-mediated disruption is dependent on N-terminal sequences that are also essential for the TATA-dependent trans-activation of the hsp70 promoter. Moreover, we also rind that Dr1 expression in transfected cells can inhibit transcription from the hsp70 promoter and that this can be overcome by coexpression of the wild-type E1A protein, dependent on N-terminal sequences. We conclude that the activation of hsp70 through the TATA element may be mechanistically similar to the activation of the E2 promoter via E2F, in each case involving a release of a transcription factor from an inactive complex.


PMID: 8022773

DOI: 10.2307/2364955

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