title: p53-Dependent regulation of Cdc6 protein stability controls cellular proliferation.
abstract: Activation of tumor suppressor p53 in response to genotoxic stress imposes cellular growth arrest or apoptosis. We identified Cdc6, a licensing factor of the prereplication complex, as a novel target of the p53 pathway. We show that activation of p53 by DNA damage results in enhanced Cdc6 destruction by the anaphase-promoting complex. This destruction is triggered by inhibition of CDK2-mediated CDC6 phosphorylation at serine 54. Conversely, suppression of p53 expression results in stabilization of Cdc6. We demonstrate that loss of p53 results in more replicating cells, an effect that can be reversed by reducing Cdc6 protein levels. Collectively, our data suggest that initiation of DNA replication is regulated by p53 through Cdc6 protein stability.
authors.affiliation: Division of Tumor Biology, The Netherlands Cancer Institute, Amsterdam.
authors.forename: Anja
authors.initials: A
authors.lastname: Duursma
authors.forename: Reuven
authors.initials: R
authors.lastname: Agami
mesh_terms: D000705:Anaphase; D000818:Animals; D015153:Blotting, Western; D018797:Cell Cycle Proteins / Q000378:metabolism*; D045744:Cell Line, Tumor; D049109:Cell Proliferation; D002469:Cell Separation; D004249:DNA Damage; D004261:DNA Replication; D004307:Dose-Response Relationship, Radiation; D004591:Electrophoresis, Polyacrylamide Gel; D005434:Flow Cytometry; D006801:Humans; D047468:Immunoprecipitation; D008156:Luciferases / Q000378:metabolism; D051379:Mice; D008954:Models, Biological; D010766:Phosphorylation; D047428:Protein Kinase Inhibitors / Q000494:pharmacology; D017434:Protein Structure, Tertiary; D011687:Purines / Q000494:pharmacology; D000077546:Roscovitine; D029701:Saccharomyces cerevisiae Proteins / Q000378:metabolism*; D012694:Serine / Q000737:chemistry; D013997:Time Factors; D016159:Tumor Suppressor Protein p53 / Q000378:metabolism*
chemical_list: C066503:CDC6 protein, S cerevisiae; D018797:Cell Cycle Proteins; D047428:Protein Kinase Inhibitors; D011687:Purines; D029701:Saccharomyces cerevisiae Proteins; D016159:Tumor Suppressor Protein p53; D000077546:Roscovitine; D012694:Serine; D008156:Luciferases