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Papers In Press, published online ahead of print February 1, 2007
Division of Cancer Biology, Department of Medicine, Evanston Northwestern Healthcare Research Institute, Northwestern University Feinberg School of Medicine, Evanston, IL 60201
Corresponding Author: v-band{at}northwestern.edu
The p53 tumor suppressor protein functions as a critical component of genotoxic stress response by regulating the expression of effector gene products that control the fate of a cell following DNA damage. Unstressed cells maintain p53 at low levels through regulated degradation, and p53 levels and activity are rapidly elevated upon genotoxic stress. Biochemical mechanisms that control the levels and activity of p53 are therefore of great interest. We and others have recently identified hAda3 (human homologue of yeast alteration/deficiency in activation 3) as a p53-interacting protein and enhancer of p53 activity. Here, we show that endogenous levels of p53 and Ada3 interact with each other and by using inducible overexpression and shRNA-mediated knockdown strategies we demonstrate that hAda3 stabilizes p53 protein by promoting its acetylation. Use of a p53 mutant with mutations of known p300/CBP acetylation sites demonstrated that hAda3-dependent acetylation is required for increase in p53 stability and target gene induction. Importantly, we demonstrate that endogenous hAda3 is essential for DNA damage-induced acetylation and stabilization of p53 as well as p53 target gene induction. Overall, our results establish hAda3, a component of coactivator complexes that include histone acetyl transferase p300/CBP as a critical mediator of acetylation-dependent stabilization and activation of p53 upon genotoxic stress in mammalian cells.
J. Biol. Chem, 10.1074/jbc.M610443200
Submitted on November 9, 2006
Revised on January 29, 2007
Accepted on February 1, 2007
An essential role of human ADA3 in p53 acetylation
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