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The adenovirus E1A gene products are nuclear phosphoproteins that can transactivate the other adenovirus early genes as well as several cellular genes, and can transform primary rodent cells in culture. Transformation and transactivation by E1A proteins is most likely to be mediated through binding to several cellular proteins, including the retinoblastoma gene product pRb, the pRb-related p107 and p130, and the TATA box binding protein TBP. We report here the cloning of BS69, a novel protein that specifically interacts with adenovirus 5 E1A. BS69 has no significant homology to known proteins and requires the region that is unique to the large (289R) E1A protein for high affinity binding. BS69 and E1A proteins coimmunoprecipitate in adenovirus-transformed 293 cells, indicating that these proteins also interact in vivo. BS69 specifically inhibits transactivation by the 289R E1A protein, but not by the 243R E1A protein. BS69 also suppressed the E1A-stimulated transcription of the retinoic acid receptor in COS cells, but did not affect the cellular E1A-like activity that is present in embryonic carcinoma cells. Our data indicate that BS69 is a novel and specific suppressor of E1A-activated transcription.
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