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Many DNA-binding transcriptional activator proteins enhance the initiation rate of RNA polymerase II-mediated gene transcription by interacting functionally with the general transcription machinery bound at the basal promoter. Adaptor proteins are usually required for this activation, possibly to acetylate and destabilize nucleosomes, thereby relieving chromatin constraints at the promoter. The protein encoded by this gene is a transcriptional activator adaptor and has been found to be part of the PCAF histone acetylase complex. In addition, it associates with the tumor suppressor protein p53 and is required for full activity of p53 and p53-mediated apoptosis. At least four alternatively spliced variants have been found for this gene, but the full-length nature of some variants has not been determined. Data identify hADA3, human homologue of the yeast transcriptional coactivator yADA3, as a novel human papillomavirus oncoprotein E6-interacting protein and a target of E6-induced degradation. Results demonstrate that human papilloma virus 16 E6 oncoprotein inhibits the RXR(alpha)-mediated transactivation of target genes, implying that perturbation of RXR-mediated transactivation by E6 could contribute to HPV oncogenesis. Results demonstrate that transcriptional adaptor ADA3 protein directly binds to human estrogen receptor alpha and beta and enhances the transcription of estrogen receptor-responsive genes.
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