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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

Nuclear FAK promotes cell proliferation and survival through FERM-enhanced p53 degradation

Ssang-Taek Lim1, Xiao Lei Chen, Yangmi Lim

  • 1Department of Reproductive Medicine, Moores Cancer Center, University of California, San Diego, 3855 Health Sciences Drive, MC0803, La Jolla, CA 92093, USA.

Molecular Cell
|January 22, 2008
PubMed

Insights

Focal adhesion kinase (FAK) controls cell growth by degrading p53. FAK

Area of Science:

  • Cell Biology
  • Molecular Biology
  • Biochemistry

Background:

  • Focal adhesion kinase (FAK) is a tyrosine kinase involved in cell motility.
  • FAK signaling is crucial for cell growth and survival, often downstream of integrins and growth factors.

Purpose of the Study:

  • To investigate the role of FAK in cell cycle regulation during mouse development.
  • To elucidate the mechanism by which FAK influences p53 stability and cell proliferation.
  • To define the scaffolding function of nuclear FAK in cellular stress response.

Main Methods:

  • Analysis of FAK knockout mouse models and primary fibroblasts.
  • Biochemical assays to assess p53 ubiquitination and degradation.
  • Studies involving FAK knockdown in human cells under various conditions (e.g., cell adhesion, drug treatment).

Main Results:

  • FAK inactivation leads to p53- and p21-dependent mesodermal cell growth arrest.
  • FAK, independent of its kinase activity, promotes p53 degradation via Mdm2-dependent ubiquitination.
  • Specific FAK FERM lobes are essential for p53 binding, nuclear localization, and Mdm2 interaction.
  • FAK knockdown in human cells increases p53-p21 levels and reduces proliferation.
  • FAK knockdown sensitizes cells to cisplatin-induced apoptosis, which is rescued by FAK re-expression.

Conclusions:

  • FAK plays a critical role in cell cycle control by regulating p53 stability.
  • Nuclear FAK acts as a scaffold to promote p53 degradation, thereby facilitating cell survival under stress.
  • These findings highlight a novel, kinase-independent function of FAK in cellular homeostasis.

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