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Purification of Ubiquitinated p53 Proteins from Mammalian Cells
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Purification of Ubiquitinated p53 Proteins from Mammalian Cells

Published on: March 21, 2022

The p53--Mdm2--HAUSP complex is involved in p53 stabilization by HAUSP.

C L Brooks1, M Li, M Hu

  • 11Department of Pathology, Institute for Cancer Genetics, College of Physicians and Surgeons, Columbia University, New York, NY, USA.

Oncogene
|May 26, 2007
PubMed
Summary

HAUSP deubiquitinase activity on p53 is surprisingly effective even without direct binding. Mdm2 acts as a bridge, enabling HAUSP to function in trans, revealing complex p53-Mdm2 pathway regulation.

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Area of Science:

  • Molecular Biology
  • Biochemistry
  • Cancer Research

Background:

  • The ubiquitin-specific protease HAUSP (also known as USP7) is a key regulator in the p53-Mdm2 pathway.
  • HAUSP deubiquitinates both p53 and Mdm2, influencing their stability and function.
  • Structural data suggests p53 and Mdm2 bind to HAUSP in a mutually exclusive manner.

Purpose of the Study:

  • To investigate the mechanism of HAUSP's action in the p53-Mdm2 pathway.
  • To elucidate the role of direct HAUSP-p53 interaction in regulating p53 ubiquitination and stability.
  • To explore the potential for therapeutic targeting of the HAUSP-p53-Mdm2 interaction.

Main Methods:

  • Site-directed mutagenesis to create a p53 mutant unable to bind HAUSP.
  • In vitro and in vivo assays to assess protein-protein interactions and ubiquitination.
  • Analysis of protein complex formation using co-immunoprecipitation.

Main Results:

  • A p53 mutant lacking HAUSP binding was generated and confirmed to interact with Mdm2 but not HAUSP.
  • Direct interaction between HAUSP and p53 was not essential for HAUSP to inhibit Mdm2-mediated p53 ubiquitination.
  • HAUSP demonstrated trans-acting deubiquitinase activity on p53, with Mdm2 acting as a molecular bridge.
  • A stable trimeric complex of p53, Mdm2, and HAUSP was observed in vivo, mediated by Mdm2.

Conclusions:

  • Direct binding of HAUSP to p53 is not strictly required for HAUSP to antagonize p53 ubiquitination.
  • Mdm2 plays a crucial role in mediating the interaction between HAUSP and p53, allowing for trans-acting deubiquitination.
  • These findings reveal a more complex regulatory mechanism within the p53-Mdm2 pathway and suggest novel therapeutic strategies targeting these interactions.