DNA damage-dependent acetylation of p73 dictates the selective activation of apoptotic target genes.

Laboratory of Gene Expression, Fondazione Andrea Cesalpino, University of Rome La Sapienza, 00161, Rome, Italy.
The tumor suppressor p53 and its close relative p73 are activated in response to DNA damage resulting in either cell cycle arrest or apoptosis. Here, we show that DNA damage induces the acetylation of p73 by the acetyltransferase p300. Inhibiting the enzymatic activity of p300 hampers apoptosis in a p53(-/-) background. Furthermore, a nonacetylatable p73 is defective in activating transcription of the proapoptotic p53AIP1 gene but retains an intact ability to regulate other targets such as p21. Finally, p300-mediated acetylation of p73 requires the protooncogene c-abl. Our results suggest that DNA damage-induced acetylation potentiates the apoptotic function of p73 by enhancing the ability of p73 to selectively activate the transcription of proapoptotic target genes.
Mesh Terms:
Acetylation, Apoptosis, Apoptosis Regulatory Proteins, Cyclin-Dependent Kinase Inhibitor p21, Cyclins, DNA Damage, DNA-Binding Proteins, Gene Expression Regulation, Genes, Tumor Suppressor, Humans, Nuclear Proteins, Proteins, Tumor Cells, Cultured, Tumor Suppressor Protein p53, Tumor Suppressor Proteins
Mol. Cell Jan. 01, 2002; 9(1);175-86 [PUBMED:11804596]
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