Abstract
THE cellular phosphoprotein p53 inhibits progression through the mammalian cell cycle1,2. Both p53 alleles are frequently mutated in human tumours3,4, indicating that p53 is a tumour suppressor. Recent studies have suggested that p53 functions as a transcrip-tional activator5–8, but the significance of this activity in cell-cycle control has not been established. The adenovirus 2 (Ad2) early IB (E1B) 55K protein binds to p53 in transformed cells9 and contributes to oncogenic transformation by Ad2 (refs 10-12). Here we report that mutants of E1B 55K and wild-type Adl2 E1B 54K proteins show a strong correlation between their ability to inhibit p53-mediated transcriptional activation and their ability to cooperate with adenovirus El A protein in the transformation of primary cells. These results indicate that p53 probably inhibits cell cycling by functioning as a transcription factor.
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Yew, P., Berk, A. Inhibition of p53 transactivation required for transformation by adenovirus early 1B protein. Nature 357, 82–85 (1992). https://doi.org/10.1038/357082a0
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DOI: https://doi.org/10.1038/357082a0
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