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    Mol Endocrinol. 1999 Nov;13(11):1924-33.

    Steroid receptor coactivator-1 and its family members differentially regulate transactivation by the tumor suppressor protein p53.

    Source

    Department of Biology, Chonnam National University, Kwangju, Korea.

    Abstract

    The tumor suppressor protein p53 exerts its cell cycle-regulatory effects through its ability to function as a sequence-specific DNA-binding transcription factor. Herein, we show that p53 physically interacts with specific subregions of steroid receptor coactivator-1 (SRC-1) and its family members, p/CIP (p300/CBP interacting protein), xSRC-3, and AIB1 (amplified in breast cancer), originally isolated as transcription coactivators of nuclear receptors, as demonstrated by the yeast and mammalian two-hybrid tests as well as glutathione S-transferase pull-down assays. Interestingly, cotransfection of HeLa cells with SRC-1- or p/CIP expression vector potentiated the p53-mediated transactivation, whereas AIB1 and xSRC-3 were repressive. All of these SRC-1 members, however, similarly stimulated transactivation mediated by nuclear receptors and AP-1, as previously described. These results suggest that SRC-1 and its family members may differentially modulate the p53 transactivation in vivo.

    PMID:
    10551785
    [PubMed - indexed for MEDLINE]
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