Regulation of polo-like kinase 1 by DNA damage and PP2A/B55α

Ling Wang, Qingyuan Guo, Laura A. Fisher, Dongxu Liu, Aimin Peng

Research output: Contribution to journalArticlepeer-review

26 Scopus citations


In addition to governing mitotic progression, Plk1 also suppresses the activation of the G2 DNA damage checkpoint and promotes checkpoint recovery. Previous studies have shown that checkpoint activation after DNA damage requires inhibition of Plk1, but the underlying mechanism of Plk1 regulation was unknown. In this study we show that the specific phosphatase activity toward Plk1 Thr-210 in interphase Xenopus egg extracts is predominantly PP2Adependent, and this phosphatase activity is upregulated by DNA damage. Consistently, PP2A associates with Plk1 and the association increases after DNA damage. We further revealed that B55α, a targeting subunit of PP2A and putative tumor suppressor, mediates PP2A/Plk1 association and Plk1 dephosphorylation. B55α and PP2A association is greatly strengthened after DNA damage in an ATM/ATR and checkpoint kinase-dependent manner. Collectively, we report a phosphatase-dependent mechanism that responds to DNA damage and regulates Plk1 and checkpoint recovery.

Original languageEnglish (US)
Pages (from-to)157-166
Number of pages10
JournalCell Cycle
Issue number1
StatePublished - Jan 1 2015


  • B55a
  • Checkpoint recovery
  • DNA damage
  • PP2A
  • Plk1

ASJC Scopus subject areas

  • Molecular Biology
  • Developmental Biology
  • Cell Biology


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