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Updated: Jun 26, 2026

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

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

Published on: August 4, 2019

The p53 mRNA-Mdm2 interaction.

Nadia Naski¹, Madhavsai Gajjar, Karima Bourougaa

¹INSERM Unité 716, Laboratoire de Pharmacologie, Institut de Génétique Moléculaire, Université Paris 7, 27 rue Juliette Dodu, Paris, France.

Cell Cycle (Georgetown, Tex.)

|December 25, 2008

Summary

The E3 ligase Mdm2 regulates p53 activity through complex feedback. Mdm2 stimulates p53 mRNA translation and protein degradation, with overlapping domains suggesting co-evolution of these functions.

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Purification of Ubiquitinated p53 Proteins from Mammalian Cells

Purification of Ubiquitinated p53 Proteins from Mammalian Cells

Published on: March 21, 2022

Area of Science:

Molecular Biology
Cancer Biology
Genetics

Background:

The E3 ligase Mdm2 is a critical regulator of the tumor suppressor p53.
Regulation involves transcription, mRNA translation, and protein degradation.
Mdm2's role as a positive regulator of p53 activity is an emerging area of research.

Purpose of the Study:

To investigate how p53-Mdm2 protein-protein and mRNA-Mdm2 interactions influence Mdm2-mediated control of p53 expression.
To utilize the Phe19Ala p53 mutant to elucidate these regulatory mechanisms.
To explore the evolutionary origins and functional significance of the p53-Mdm2 feedback system.

Main Methods:

Analysis of p53-Mdm2 protein-protein interactions.
Investigation of p53 mRNA-Mdm2 interactions, including binding sites and functional consequences.
Utilizing the Phe19Ala p53 mutant to dissect specific regulatory roles.
Comparative analysis of Mdm2's RNA binding and E3 ligase domains.

Main Results:

Mdm2 binding to p53 mRNA stimulates p53 translation.
This interaction concurrently suppresses Mdm2's ability to promote p53 polyubiquitination and degradation.
The p53 mRNA sequence interacting with Mdm2's N-terminus is identical to the sequence interacting with the Mdm2 RING domain.
Overlapping RNA binding and E3 ligase domains in Mdm2 suggest co-evolution of p53 synthesis and degradation control.

Conclusions:

The p53-Mdm2 interaction is a sophisticated feedback system regulating p53 expression at multiple levels.
Insights into this regulation can illuminate the system's origin and the function of Mdm2 isoforms.
The dual function of Mdm2 in controlling p53 synthesis and degradation highlights a conserved regulatory strategy.