4.8 Article

p300/CBP-mediated p53 acetylation is commonly induced by p53-activating agents and inhibited by MDM2

期刊

EMBO JOURNAL
卷 20, 期 6, 页码 1331-1340

出版社

WILEY
DOI: 10.1093/emboj/20.6.1331

关键词

acetylation; CBP; MDM2; p300; p53

资金

  1. NCI NIH HHS [R01 CA085676, CA85676-01A1] Funding Source: Medline
  2. NIDDK NIH HHS [R01 DK050494, DK50494] Funding Source: Medline

向作者/读者索取更多资源

The tumor suppressor p53 is activated in response to many types of cellular and environmental insults via mechanisms involving post-translational modification, Here we demonstrate that, unlike phosphorylation, p53 invariably undergoes acetylation in cells exposed to a variety of stress-inducing agents including hypoxia, anti-metabolites, nuclear export inhibitor and actinomycin D treatment. lie vivo, p53 acetylation is mediated by the p300 and CBP acetyltransferases. Overexpression of either p300 or CBP, but not an acetyltransferase-deficient mutant, efficiently induces specific p53 acetylation, In contrast, MDM2, a negative regulator of p53, actively suppresses p300/CBP-mediated p53 acetylation in vivo and in vitro. This inhibitory activity of MDM2 on p53 acetylation is in turn abrogated by tumor suppressor p19(ARF), indicating that regulation of acetylation is a central target of the p53-MDM2-p19(ARF) feedback loop. Functionally, inhibition of deacetylation promotes p53 stability, suggesting that acetylation plays a positive role in the accumulation of p53 protein in stress response. Our results provide evidence that p300/CBP-mediated acetylation may be a universal and critical modification for p53 function.

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