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    Genes Dev. 1999 Jan 15;13(2):152-7.

    A role for ATR in the DNA damage-induced phosphorylation of p53.

    Tibbetts RS, Brumbaugh KM, Williams JM, Sarkaria JN, Cliby WA, Shieh SY, Taya Y, Prives C, Abraham RT.

    Department of Pharmacology and Cancer Cell Biology, Duke University, Durham, North Carolina 27710 USA.

    Phosphorylation at Ser-15 may be a critical event in the up-regulation and functional activation of p53 during cellular stress. In this report we provide evidence that the ATM-Rad3-related protein ATR regulates phosphorylation of Ser-15 in DNA-damaged cells. Overexpression of catalytically inactive ATR (ATRki) in human fibroblasts inhibited Ser-15 phosphorylation in response to gamma-irradiation and UV light. In gamma-irradiated cells, ATRki expression selectively interfered with late-phase Ser-15 phosphorylation, whereas ATRki blocked UV-induced Ser-15 phosphorylation in a time-independent manner. ATR phosphorylated p53 at Ser-15 and Ser-37 in vitro, suggesting that p53 is a target for phosphorylation by ATR in DNA-damaged cells.

    PMID: 9925639 [PubMed - indexed for MEDLINE]

    PMCID: 316393

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