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Yeast As a Chassis for Developing Functional Assays to Study Human P53
14:57

Yeast As a Chassis for Developing Functional Assays to Study Human P53

Published on: August 4, 2019

p53 mediates the negative regulation of MDM2 by orphan receptor TR3

Bi-xing Zhao1, Hang-zi Chen, Na-zi Lei

  • 1Key Laboratory of the Ministry of Education for Cell Biology and Tumor Cell Engineering, School of Life Sciences, Xiamen University, Xiamen 361005, Fujian, China.

The EMBO Journal
|December 2, 2006
PubMed

Insights

Orphan receptor TR3 suppresses MDM2 oncoprotein by interacting with p53, inhibiting MDM2 transcription and promoting its degradation. This reveals TR3 as a potential anticancer target.

Area of Science:

  • Molecular Biology
  • Oncology
  • Biochemistry

Background:

  • MDM2 is an oncoprotein that drives tumor progression when overexpressed.
  • Orphan receptor TR3 negatively regulates MDM2 expression, but the mechanism is unclear.
  • Understanding TR3's regulation of MDM2 is crucial for cancer therapy development.

Purpose of the Study:

  • To elucidate the mechanism by which TR3 inhibits MDM2 expression.
  • To investigate the role of p53 in TR3-mediated suppression of MDM2.
  • To explore the therapeutic potential of TR3 in cancer treatment.

Main Methods:

  • Co-immunoprecipitation assays to detect protein interactions.
  • Western blotting to assess protein levels and modifications.
  • Reporter assays to measure transcriptional activity.
  • UV irradiation and apoptosis assays.

Main Results:

  • TR3 directly interacts with p53, not MDM2.
  • TR3 inhibits MDM2 transcription by blocking p53 acetylation.
  • TR3 binding to p53 prevents MDM2-induced p53 degradation.
  • TR3 enhances p53-mediated apoptosis following UV irradiation.

Conclusions:

  • p53 mediates TR3's suppression of MDM2 at both transcriptional and post-transcriptional levels.
  • TR3 represents a promising therapeutic target for inhibiting MDM2-driven tumor progression.
  • Targeting TR3 may offer a novel strategy for developing anticancer agents.

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