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Regulation of Krüppel-like factor 4 by the anaphase promoting complex pathway is involved in TGF-beta signaling

Dong Hu1, Yong Wan

  • 1Department of Cell Biology and Physiology and University of Pittsburgh Cancer Institute, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania 15213, USA.

The Journal of Biological Chemistry
|December 24, 2010
PubMed

Insights

Krüppel-like factor 4 (KLF4) degradation is controlled by the Cdh1-anaphase promoting complex E3 ligase in response to TGF-β signaling. This mechanism involves KLF4

Area of Science:

  • Molecular Biology
  • Cell Biology
  • Biochemistry

Background:

  • Krüppel-like factor 4 (KLF4) is a transcription factor regulating key cellular processes.
  • Post-translational modifications influence KLF4 activity, with recent focus on its proteolysis.
  • The precise mechanisms of KLF4 degradation, especially in response to signaling pathways, are not fully understood.

Purpose of the Study:

  • To elucidate the mechanism of Krüppel-like factor 4 (KLF4) degradation induced by TGF-β signaling.
  • To identify the specific E3 ligase responsible for targeting KLF4 for degradation.
  • To investigate the functional consequences of KLF4 proteolysis in TGF-β signaling.

Main Methods:

  • Utilized RNA interference to deplete Cdh1.
  • Generated KLF4 mutants with disrupted destruction boxes.
  • Assessed KLF4 ubiquitylation and degradation via Western blotting.
  • Measured TGF-β-induced transcriptional activation.

Main Results:

  • Demonstrated profound KLF4 degradation in response to TGF-β signaling.
  • Identified the Cdh1-anaphase promoting complex as the E3 ligase for TGF-β-induced KLF4 degradation.
  • Confirmed that degradation is mediated by a destruction box within KLF4.
  • Showed that Cdh1 depletion or KLF4 stabilization attenuates ubiquitylation, degradation, and TGF-β-induced transcription.

Conclusions:

  • The Cdh1-anaphase promoting complex governs TGF-β-induced KLF4 degradation through its destruction box.
  • KLF4 proteolysis plays a significant role in regulating TGF-β signaling.
  • This finding provides new insights into the molecular mechanisms of TGF-β pathway regulation.

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