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Related Experiment Videos

HAUSP is required for p53 destabilization.

Jordan M Cummins1, Bert Vogelstein

  • 1The Howard Hughes Medical Institute, The Sidney Kimmel Comprehensive Cancer Center, Program in Cellular and Molecular Medicine, The Johns Hopkins University Medical Institutions, Baltimore, Maryland, USA. jcummins@jhmi.edu

Cell Cycle (Georgetown, Tex.)
|May 1, 2004
PubMed
Summary
This summary is machine-generated.

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The study found that HAUSP (USP7) deficiency unexpectedly increases p53 levels by reducing p53 ubiquitination. This occurs because HAUSP normally targets MDM2, a p53 regulator, for ubiquitination.

Area of Science:

  • Molecular Biology
  • Cell Biology
  • Biochemistry

Background:

  • p53 protein levels are primarily regulated by ubiquitination.
  • HAUSP (USP7) was previously thought to deubiquitinate and stabilize p53.
  • Overexpression of HAUSP was reported to increase p53 levels.

Purpose of the Study:

  • To investigate the role of HAUSP in p53 regulation.
  • To determine the effect of HAUSP gene disruption on p53 levels and activity.
  • To elucidate the mechanism underlying HAUSP's influence on the p53/MDM2 axis.

Main Methods:

  • Homologous recombination was used to disrupt the HAUSP genomic locus.
  • p53 ubiquitination levels were assessed in HAUSP-deficient cells.
  • p53 transcriptional targets and cellular growth arrest were analyzed.

Related Experiment Videos

  • MDM2 ubiquitination was examined in the context of HAUSP deficiency.

    • Main Results:

    • HAUSP ablation led to p53 accumulation, contrary to predictions.
    • p53 ubiquitination decreased in the absence of HAUSP.
    • p53 remained active in HAUSP-deficient cells, inducing target genes and causing growth arrest.
    • Increased ubiquitination of MDM2 was observed in HAUSP-deficient cells.

    Conclusions:

    • MDM2, not p53, is the physiological substrate for HAUSP.
    • HAUSP deficiency stabilizes p53 by increasing MDM2 ubiquitination and degradation.
    • This study reveals an unexpected regulatory mechanism within the p53/MDM2 pathway.