Plk1 phosphorylation of Topors is involved in its degradation

Xiaoming Yang, Hongchang Li, Anping Deng, Xiaoqi Liu

Research output: Contribution to journalArticlepeer-review

9 Scopus citations


Topors is a DNA topoisomerase I- and p53-binding protein, and mainly functions as a p53 regulator. Accumulating evidence also supports the notion that Topors plays the role as a negative regulator of cell growth, and possibly as a tumor suppressor. Here, we demonstrated that Topors is also involved in normal mitotic progression, since Topors depletion delays mitotic entry and affects mitotic progression. Furthermore, Topors is degradated in response to the activation of the spindle checkpoint. Significantly, Polo-like kinase 1 (Plk1)-associated phosphorylation of Topors at S718 is essential for nocodazole-induced degradation of Topors.

Original languageEnglish
Pages (from-to)3023-3028
Number of pages6
JournalMolecular Biology Reports
Issue number6
StatePublished - Jul 2010

Bibliographical note

Funding Information:
Acknowledgments We thank Drs. Ourania Andrisani and Wen-Horng Wang for helpful discussions. X.L. is a recipient of the Howard Temin Award K01 CA114401 from the National Cancer Institute. X.Y. is supported by the China Scholarship Council.


  • Phosphorylation
  • Polo-like kinase 1
  • Protein degradation
  • Spindle checkpoint
  • Topors

ASJC Scopus subject areas

  • Molecular Biology
  • Genetics


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