XPC promotes MDM2-mediated degradation of the p53 tumor suppressor

Jing Yan Krzeszinski, Vitnary Choe, Jia Shao, Xin Bao, Haili Cheng, Shiwen Luo, Keke Huo, Hai Rao

Research output: Contribution to journalArticlepeer-review

13 Scopus citations


Although ubiquitin receptor Rad23 has been implicated in bringing ubiquitylated p53 to the proteasome, how Rad23 recognizes p53 remains unclear. We demonstrate that XPC, a Rad23-binding protein, regulates p53 turnover. p53 protein in XPC-deficient cells remains ubiquitylated, but its association with the proteasome is drastically reduced, indicating that XPC regulates a postubiquitylation event. Furthermore, we found that XPC participates in the MDM2-mediated p53 degradation pathway via direct interaction with MDM2. XPC W690S pathogenic mutant is specifically defective for MDM2 binding and p53 degradation. p53 is known to become stabilized following UV irradiation but can be rendered unstable by XPC overexpression, underscoring a critical role of XPC in p53 regulation. Elucidation of the proteolytic role of XPC in cancer cells will help to unravel the detailed mechanisms underlying the coordination of DNA repair and proteolysis.

Original languageEnglish (US)
Pages (from-to)213-221
Number of pages9
JournalMolecular Biology of the Cell
Issue number2
StatePublished - Jan 15 2014

ASJC Scopus subject areas

  • Molecular Biology
  • Cell Biology


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