PML regulates p53 stability by sequestering Mdm2 to the nucleolus

Rosa Bernardi, Pier Paolo Scaglioni, Stephan Bergmann, Henning F. Horn, Karen H. Vousden, Pier Paolo Pandolfi

Research output: Contribution to journalArticlepeer-review

287 Scopus citations


The promyelocytic leukaemia (PML) tumour-suppressor protein potentiates p53 function by regulating post-translational modifications, such as CBP-dependent acetylation1,2 and Chk2-dependent phosphorylation, in the PML-Nuclear Body (NB)3. PML was recently shown to interact with the p53 ubiquitin-ligase Mdm2 (refs 4-6); however, the mechanism by which PML regulates Mdm2 remains unclear. Here, we show that PML enhances p53 stability by sequestering Mdm2 to the nucleolus. We found that after DNA damage, PML and Mdm2 accumulate in the nucleolus in an Arf-independent manner. In addition, we found that the nucleolar localization of PML is dependent on ATR activation and phosphorylation of PML by ATR. Notably, in Pml-/- cells, sequestration of Mdm2 to the nucleolus was impaired, as well as p53 stabilization and the induction of apoptosis. Furthermore, we demonstrate that PML physically associates with the nucleolar protein L11, and that L11 knockdown impairs the ability of PML to localize to nucleoli after DNA damage. These findings demonstrate an unexpected role of PML in the nucleolar network for tumour suppression.

Original languageEnglish (US)
Pages (from-to)665-672
Number of pages8
JournalNature cell biology
Issue number7
StatePublished - Jul 2004

ASJC Scopus subject areas

  • Cell Biology


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