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Evaluation of Substrate Ubiquitylation by E3 Ubiquitin-ligase in Mammalian Cell Lysates
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Evaluation of Substrate Ubiquitylation by E3 Ubiquitin-ligase in Mammalian Cell Lysates

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FBW7-mediated ubiquitination and degradation of KLF5

Yi Luan1, Ping Wang1

  • 1Yi Luan, Ping Wang, Shanghai Key Laboratory of Regulatory Biology, Institute of Biomedical Sciences and School of Life Sciences, East China Normal University, Shanghai 200241, China.

World Journal of Biological Chemistry
|June 13, 2014
PubMed

Insights

The tumor suppressor FBW7 targets KLF5 for degradation via ubiquitination, controlling cell proliferation and tumorigenesis. This process involves KLF5 phosphorylation by Glycogen synthase kinase 3β and interaction with FBW7 through Cdc4 phospho-degrons.

Area of Science:

  • Molecular Biology
  • Cell Biology
  • Cancer Research

Background:

  • Krüppel-like factor (KLF) proteins are key transcription factors regulating cellular processes.
  • KLF5 is implicated in cell proliferation and tumorigenesis.
  • Post-translational modifications critically control KLF protein function.

Purpose of the Study:

  • To review the mechanisms of FBW7-mediated ubiquitination and degradation of KLF5.
  • To highlight the role of KLF5 stability in regulating gene expression.
  • To summarize the interplay between KLF5, FBW7, and cancer.

Main Methods:

  • Literature review of studies on KLF5, FBW7, and post-translational modifications.
  • Analysis of ubiquitination and degradation pathways.
  • Examination of KLF5 phosphorylation and interaction with FBW7.

Main Results:

  • FBW7, an E3 ubiquitin ligase, targets KLF5 for ubiquitination and degradation.
  • KLF5 contains Cdc4 phospho-degrons (CPDs) essential for FBW7 interaction.
  • Glycogen synthase kinase 3β phosphorylates KLF5 CPDs, facilitating FBW7 binding.
  • FBW7 modulates KLF5 stability, impacting target gene expression in cancer.

Conclusions:

  • FBW7-mediated degradation of KLF5 is a crucial regulatory mechanism.
  • Dysregulation of this pathway contributes to tumorigenesis.
  • Targeting the FBW7-KLF5 axis may offer therapeutic strategies for cancer.
Keywords:
DegradationFBW7Krüppel-like factor 5Krüppel-like factor familyUbiquitin proteasome system

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