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Purification of Ubiquitinated p53 Proteins from Mammalian Cells
10:55

Purification of Ubiquitinated p53 Proteins from Mammalian Cells

Published on: March 21, 2022

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RNF12 promotes p53-dependent cell growth suppression and apoptosis by targeting MDM2 for destruction

Kun Gao1, Chenji Wang1, Xiaofeng Jin1

  • 1State Key Laboratory of Genetic Engineering, Collaborative Innovation Center for Genetics and Development, School of Life Sciences, Fudan University, 2005 Songhu Road, Shanghai 200433, China.

Cancer Letters
|March 2, 2016
PubMed

Insights

RNF12, an E3 ubiquitin ligase, targets MDM2 for degradation, stabilizing the tumor suppressor p53. This finding reveals RNF12 as a novel regulator of the MDM2-p53 pathway, impacting cancer suppression.

Area of Science:

  • Molecular Biology
  • Oncology
  • Biochemistry

Background:

  • The MDM2-p53 pathway is crucial for cell cycle control and tumor suppression.
  • MDM2, an E3 ubiquitin ligase, targets p53 for degradation, promoting cancer cell survival.
  • Dysregulation of the MDM2-p53 axis is common in human cancers.

Purpose of the Study:

  • To identify novel regulators of the MDM2-p53 axis.
  • To investigate the role of RNF12 in MDM2 degradation and p53 stabilization.
  • To elucidate the function of RNF12 in tumor suppression.

Main Methods:

  • Yeast two-hybrid screening to identify MDM2-interacting proteins.
  • Ubiquitination assays to assess MDM2 degradation.
  • Western blotting to measure protein levels of MDM2 and p53.
  • Cellular assays to evaluate cell growth and apoptosis.

Main Results:

  • RNF12 was identified as an MDM2-interacting protein.
  • RNF12 mediates the ubiquitination and proteasomal degradation of MDM2, independent of MDM2 self-ubiquitination.
  • RNF12 enhances p53 protein levels by inhibiting MDM2-mediated p53 degradation.
  • RNF12 promotes p53-dependent cell growth suppression and apoptosis.

Conclusions:

  • RNF12 acts as an external E3 ubiquitin ligase targeting MDM2 for destruction.
  • RNF12 functions as a positive regulator of the p53 pathway.
  • RNF12 has potential roles in tumor suppression via the MDM2-p53 axis.
Keywords:
ApoptosisDegradationMDM2RNF12Ubiquitinationp53

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