title: Regulation of p53 by Mdm2: fate is in the numbers.
abstract: The p53 tumor suppressor protein is normally restrained by the Mdm2 oncoprotein, which promotes p53 ubiquitination. In a recent issue of Science, report that p53 may face two alternative fates, depending on Mdm2 levels: high Mdm2 drives p53 polyubiquitination and degradation within the cell nucleus, whereas low Mdm2 promotes p53 monoubiquitination and nuclear exclusion.
authors.affiliation: Department of Molecular Cell Biology, The Weizmann Institute of Science, POB 26, 76100 Rehovot, Israel.
authors.forename: Ayelet
authors.initials: A
authors.lastname: Shmueli
authors.forename: Moshe
authors.initials: M
authors.lastname: Oren
mesh_terms: D021581:Active Transport, Cell Nucleus; D017209:Apoptosis; D002467:Cell Nucleus / Q000378:metabolism*; D003546:Cysteine Endopeptidases / Q000378:metabolism; D003593:Cytoplasm / Q000378:metabolism; D005786:Gene Expression Regulation; D006801:Humans; D008025:Ligases; D008954:Models, Biological; D009097:Multienzyme Complexes / Q000378:metabolism; D009687:Nuclear Proteins; D046988:Proteasome Endopeptidase Complex; D011518:Proto-Oncogene Proteins / Q000378:metabolism*; D051736:Proto-Oncogene Proteins c-mdm2; D011993:Recombinant Fusion Proteins / Q000378:metabolism; D016159:Tumor Suppressor Protein p53 / Q000235:genetics / Q000378:metabolism*; D025801:Ubiquitin / Q000235:genetics / Q000378:metabolism
chemical_list: D009097:Multienzyme Complexes; D009687:Nuclear Proteins; D011518:Proto-Oncogene Proteins; D011993:Recombinant Fusion Proteins; D016159:Tumor Suppressor Protein p53; D025801:Ubiquitin; C497206:MDM2 protein, human; D051736:Proto-Oncogene Proteins c-mdm2; D003546:Cysteine Endopeptidases; D046988:Proteasome Endopeptidase Complex; D008025:Ligases