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Proteomic identification of ZO-1/2 as a novel scaffold for Src/Csk regulatory circuit

Kazunobu Saito1, Kengo Enya, Chitose Oneyama

  • 1Department of Oncogene Research, Research Institute for Microbial Diseases, Osaka University, 3-1 Yamada-oka, Suita, Osaka 565-0871, Japan.

Biochemical and Biophysical Research Communications
|December 19, 2007
PubMed

Insights

This study reveals that ZO-1/2 proteins are key players in cell transformation regulated by c-Src tyrosine kinase. ZO-1/2 acts as a scaffold, interacting with both c-Src and its regulator Csk.

Area of Science:

  • Cell Biology
  • Molecular Oncology
  • Signal Transduction

Background:

  • Cell transformation is a critical step in cancer development.
  • c-Src tyrosine kinase plays a significant role in regulating cell growth and transformation.
  • Understanding the precise molecular mechanisms underlying c-Src-induced transformation is crucial for targeted therapies.

Purpose of the Study:

  • To investigate the regulatory mechanisms of cell transformation induced by c-Src tyrosine kinase.
  • To identify and characterize proteins interacting with c-Src and its negative regulator, Csk.
  • To elucidate the role of ZO-1/2 proteins in the context of c-Src-mediated cell transformation.

Main Methods:

  • Proteomic analysis using Liquid Chromatography-Mass Spectrometry/Mass Spectrometry (LC-MS/MS).
  • Affinity purification of c-Src interacting proteins utilizing the Src SH2 domain.
  • Tandem affinity purification to identify Csk binding proteins.

Main Results:

  • Identified known Src substrates (focal adhesion kinase, paxillin) and ZO-1/2 as a transformation-dependent Src target.
  • Discovered ZO-1/2 as a major Csk binding protein, in addition to Cbp/PAG, paxillin, and caveolin-1.
  • Demonstrated that ZO-2 phosphorylation and binding to Csk (via Csk SH2 domain) occur concurrently with Src transformation.

Conclusions:

  • ZO-1/2 proteins function as novel scaffolds for Src and Csk signaling pathways.
  • These ZO proteins are potentially involved in the regulation of Src-mediated cell transformation.
  • The findings provide new insights into the molecular basis of oncogenic Src signaling.

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