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Identification of Cyclin-dependent Kinase 1 Specific Phosphorylation Sites by an In Vitro Kinase Assay
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Identification of Cyclin-dependent Kinase 1 Specific Phosphorylation Sites by an In Vitro Kinase Assay

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CDK2 phosphorylation regulates the protein stability of KLF10 by interfering with binding of the E3 ligase SIAH1

Ching-Hui Lin1, Shu-Yu Lin2, Hsuen-Wen Chang3

  • 1National Institute of Cancer Research, National Health Research Institutes, Taipei, Taiwan.

Biochimica Et Biophysica Acta
|March 3, 2015
PubMed

Insights

Cyclin-dependent kinase 2 (CDK2) phosphorylation stabilizes the tumor suppressor KLF10 by preventing its degradation. This CDK2-dependent regulation impacts KLF10

Area of Science:

  • Molecular Biology
  • Cell Biology
  • Oncology

Background:

  • Transforming growth factor-beta 1 (TGF-β1) inhibits human carcinoma cell proliferation via cell cycle regulation.
  • KLF10, a known tumor suppressor, mimics TGF-β1's anti-proliferative and apoptotic effects on epithelial and tumor cells.
  • KLF10 protein levels are linked to cell cycle events, but its regulatory mechanisms remain unclear.

Purpose of the Study:

  • To elucidate the regulatory mechanism of KLF10 protein expression.
  • To identify the specific kinase responsible for KLF10 phosphorylation.
  • To understand how KLF10 phosphorylation affects its stability and function in cell cycle regulation.

Main Methods:

  • Mass spectrometry to identify phosphorylation sites.
  • Site-directed mutagenesis to confirm kinase activity.
  • In vitro kinase assays to assess CDK2 interaction and phosphorylation.
  • Depletion assays to evaluate the role of SIAH1 in KLF10 degradation.

Main Results:

  • KLF10 is phosphorylated by CDK2/cyclin E, with strong binding to CDK2.
  • CDK2 specifically phosphorylates KLF10 at Serine 206 (Ser206).
  • CDK2-mediated phosphorylation stabilizes KLF10 by reducing its interaction with the E3-ubiquitin ligase SIAH1, thereby inhibiting proteasomal degradation.

Conclusions:

  • CDK2-dependent phosphorylation is a key regulator of KLF10 protein stability.
  • This phosphorylation mechanism influences KLF10's role as a tumor suppressor.
  • Understanding this pathway offers insights into controlling cell proliferation in human carcinomas.
Keywords:
CDK2Cell cycleKLF10PhosphorylationTGF-β1

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