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Related Experiment Videos

Cdk5 phosphorylates p53 and regulates its activity.

Jianwen Zhang1, Pavan K Krishnamurthy, Gail V W Johnson

  • 1Department of Psychiatry and Neurobiology, University of Alabama at Birmingham, 35294-0017, USA.

Journal of Neurochemistry
|June 18, 2002
PubMed
Summary

Cyclin-dependent kinase 5 (Cdk5) phosphorylates the tumor suppressor p53, increasing its levels and activity. This finding reveals a novel mechanism by which Cdk5 may promote apoptosis and contribute to neurodegenerative diseases.

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Area of Science:

  • Neuroscience
  • Molecular Biology
  • Cell Biology

Background:

  • Cyclin-dependent kinase 5 (Cdk5) is a key kinase in the central nervous system (CNS).
  • Cdk5 is implicated in neurodegenerative diseases and apoptosis.
  • The tumor suppressor p53 regulates cell growth arrest and death via gene expression.

Purpose of the Study:

  • To investigate the role of Cdk5 in apoptosis by examining its effects on p53 activity.
  • To determine if p53 is a substrate of Cdk5.

Main Methods:

  • Analysis of p53 and Cdk5 levels in apoptotic PC12 cells.
  • In vitro phosphorylation assays using recombinant p53 and Cdk5/p25.
  • Transient transfection experiments to assess the impact of Cdk5/p25 on p53 and downstream gene expression.

Related Experiment Videos

  • Measurement of p53 transcriptional activity in situ.

    • Main Results:

    • Cdk5 and p53 levels increase concurrently in apoptotic PC12 cells.
    • Cdk5/p25 phosphorylates p53 in vitro.
    • Cdk5/p25 transfection increases p53 levels and expression of p53-responsive genes (p21, Bax).
    • Cdk5 activity significantly enhances p53 transcriptional activity in cells.

    Conclusions:

    • p53 is a direct substrate of Cdk5.
    • Cdk5 modulates p53 levels and transcriptional activity.
    • Cdk5 may facilitate apoptosis by activating p53, offering insights into neurodegeneration.