The cellular transcription co-activators p300 and the CREB-binding protein CBP are cellular targets for transformation by the E1A proteins of non-oncogenic adenovirus 5 (Ad5). In this study, we show that the E1A proteins of oncogenic Ad12, like those of Ad5, can also bind to CBP and that this interaction is direct. In addition, we show that the Ad12 E1A proteins can also bind directly to p300. These results suggest that E1A can modulate the function of proteins of the p300 family via direct protein-protein interactions.


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