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

Journal Article (Journal Article)

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. In 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.

Full Text

Duke Authors

Cited Authors

  • Ito, A; Lai, CH; Zhao, X; Saito, S; Hamilton, MH; Appella, E; Yao, TP

Published Date

  • March 15, 2001

Published In

Volume / Issue

  • 20 / 6

Start / End Page

  • 1331 - 1340

PubMed ID

  • 11250899

Pubmed Central ID

  • PMC145533

International Standard Serial Number (ISSN)

  • 0261-4189

Digital Object Identifier (DOI)

  • 10.1093/emboj/20.6.1331


  • eng

Conference Location

  • England