APC/C (Cdh1) controls the proteasome-mediated degradation of E2F3 during cell cycle exit

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Zhen Ping1, Ratna Lim, Tarig Bashir

  • 1Hubrecht Institute-KNAW and University Medical Center Utrecht, Utrecht, The Netherlands.

Cell Cycle (Georgetown, Tex.)
|May 15, 2012
PubMed

Insights

E2F3 protein is degraded by the APC/C (Cdh1) complex during cell cycle exit. This regulation is crucial for cell differentiation and preventing tumor formation.

Area of Science:

  • Molecular Biology
  • Cell Biology
  • Cancer Biology

Background:

  • E2F transcription factors are key regulators of cell cycle progression and differentiation.
  • E2F3 amplification in human tumors highlights its oncogenic potential.
  • Understanding E2F3 regulation is crucial for cancer research.

Purpose of the Study:

  • To investigate the regulatory mechanisms controlling E2F3 stability.
  • To determine the role of the anaphase-promoting complex/cyclosome (APC/C) in E2F3 degradation.
  • To elucidate the specific APC/C activator involved in E2F3 turnover.

Main Methods:

  • Co-immunoprecipitation to study protein interactions.
  • Western blotting to assess protein levels and degradation.
  • RNA interference to silence Cdh1 expression.
  • Overexpression studies of APC/C activators (Cdh1 and Cdc20).

Main Results:

  • E2F3 protein levels decrease upon cell cycle exit.
  • E2F3 degradation is mediated by the anaphase-promoting complex/cyclosome (APC/C) and its activator Cdh1.
  • E2F3 interacts with Cdh1 but not Cdc20.
  • Cdh1 overexpression leads to E2F3 degradation, while Cdc20 overexpression does not.
  • Silencing Cdh1 stabilizes E2F3 in differentiating neuroblastoma cells.

Conclusions:

  • The APC/C (Cdh1) ubiquitin ligase targets E2F3 for proteasome-dependent degradation.
  • This degradation process is essential for cell cycle exit and neuronal differentiation.
  • Targeting the APC/C (Cdh1)-E2F3 pathway may offer therapeutic strategies for tumors with E2F3 amplification.

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