title: MDM2-HDAC1-mediated deacetylation of p53 is required for its degradation.
abstract: The tumor suppressor p53 is stabilized and activated in response to cellular stress through post-translational modifications including acetylation. p300/CBP-mediated acetylation of p53 is negatively regulated by MDM2. Here we show that MDM2 can promote p53 deacetylation by recruiting a complex containing HDAC1. The HDAC1 complex binds MDM2 in a p53-independent manner and deacetylates p53 at all known acetylated lysines in vivo. Ectopic expression of a dominant-negative HDAC1 mutant restores p53 acetylation in the presence of MDM2, whereas wild-type HDAC1 and MDM2 deacetylate p53 synergistically. Fibroblasts overexpressing a dominant negative HDAC1 mutant display enhanced DNA damage-induced p53 acetylation, increased levels of p53 and a more pronounced induction of p21 and MDM2. These results indicate that acetylation promotes p53 stability and function. As the acetylated p53 lysine residues overlap with those that are ubiquitylated, our results suggest that one major function of p53 acetylation is to promote p53 stability by preventing MDM2-dependent ubiquitylation, while recruitment of HDAC1 by MDM2 promotes p53 degradation by removing these acetyl groups.
authors.affiliation: Department of Pharmacology and Cancer Biology, Duke University, Durham, NC 27710, USA.
authors.forename: Akihiro
authors.initials: A
authors.lastname: Ito
authors.forename: Yoshiharu
authors.initials: Y
authors.lastname: Kawaguchi
authors.forename: Chun-Hsiang
authors.initials: CH
authors.lastname: Lai
authors.forename: Jeffrey J
authors.initials: JJ
authors.lastname: Kovacs
authors.forename: Yuichiro
authors.initials: Y
authors.lastname: Higashimoto
authors.forename: Ettore
authors.initials: E
authors.lastname: Appella
authors.forename: Tso-Pang
authors.initials: TP
authors.lastname: Yao
mesh_terms: D016475:3T3 Cells / Q000528:radiation effects; D000107:Acetylation; D000123:Acetyltransferases / Q000378:metabolism; D000595:Amino Acid Sequence; D000818:Animals; D018797:Cell Cycle Proteins / Q000378:metabolism; D002478:Cells, Cultured; D004247:DNA / Q000528:radiation effects; D004249:DNA Damage; D005347:Fibroblasts / Q000378:metabolism; D005799:Genes, Dominant; D051548:Histone Acetyltransferases; D056284:Histone Deacetylase 1; D006655:Histone Deacetylases / Q000235:genetics / Q000502:physiology*; D006801:Humans; D008239:Lysine / Q000737:chemistry; D046911:Macromolecular Substances; D051379:Mice; D018345:Mice, Knockout; D008969:Molecular Sequence Data; D009687:Nuclear Proteins; D011499:Protein Processing, Post-Translational / Q000502:physiology*; D011518:Proto-Oncogene Proteins / Q000172:deficiency / Q000235:genetics / Q000502:physiology*; D051736:Proto-Oncogene Proteins c-mdm2; D011993:Recombinant Fusion Proteins / Q000378:metabolism; D014157:Transcription Factors; D014162:Transfection; D016159:Tumor Suppressor Protein p53 / Q000172:deficiency / Q000378:metabolism*; D025801:Ubiquitin / Q000378:metabolism; D050880:p300-CBP Transcription Factors; D000099224:p300-CBP-Associated Factor
chemical_list: D000123:Acetyltransferases; D018797:Cell Cycle Proteins; D004247:DNA; D051548:Histone Acetyltransferases; D056284:Histone Deacetylase 1; D006655:Histone Deacetylases; D008239:Lysine; D046911:Macromolecular Substances; D009687:Nuclear Proteins; D011518:Proto-Oncogene Proteins; D051736:Proto-Oncogene Proteins c-mdm2; D011993:Recombinant Fusion Proteins; D014157:Transcription Factors; D016159:Tumor Suppressor Protein p53; D025801:Ubiquitin; D050880:p300-CBP Transcription Factors; D000099224:p300-CBP-Associated Factor; C497206:MDM2 protein, human; C497207:Mdm2 protein, mouse; C110550:HDAC1 protein, human