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Related Experiment Video

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A High-content Imaging Workflow to Study Grb2 Signaling Complexes by Expression Cloning
10:52

A High-content Imaging Workflow to Study Grb2 Signaling Complexes by Expression Cloning

Published on: October 30, 2012

A high-content imaging workflow to study Grb2 signaling complexes by expression cloning.

Jamie Freeman1, Janos Kriston-Vizi, Brian Seed

  • 1MRC LMCB, University College London.

Journal of Visualized Experiments : Jove
|November 15, 2012
PubMed
Summary

This study presents a microscopy assay to track Grb2 protein recruitment to the cell membrane, aiding in the identification of protein interactions in mammalian cells. This method visualizes Grb2

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Published on: March 22, 2012

Area of Science:

  • Cellular Biology
  • Molecular Biology
  • Biochemistry

Background:

  • Signal transduction via growth factor receptors is crucial for cell proliferation and differentiation.
  • Grb2 (Growth factor receptor-bound protein 2) is a key adaptor protein regulating mitogenic signaling by linking activated receptors to downstream pathways like Ras-MAP kinase.
  • Grb2's modular structure enables diverse protein interactions and signaling roles, including regulation of receptor endocytosis.

Purpose of the Study:

  • To develop and describe a simple microscopy assay for monitoring Grb2 recruitment to the plasma membrane.
  • To adapt this assay for genome-wide, high-content screening to identify in vivo Grb2 protein complexes based on sub-cellular localization.
  • To enable visualization and analysis of protein interactions within mammalian cells at their site of action.

Main Methods:

  • Utilizing a green-fluorescent protein (GFP)-tagged Grb2 to monitor its sub-cellular localization changes in response to stimuli.
  • Employing a microscopy-based assay to observe the recruitment of GFP-Grb2 to the plasma membrane upon interaction with activated receptors like EGFR.
  • Adapting the assay for high-content screening, involving cDNA expression, cell transfection, and image acquisition.

Main Results:

  • The assay successfully monitors the recruitment of GFP-Grb2 to the plasma membrane, correlating with receptor activation.
  • Demonstrates that activated receptors, such as EGFR, recruit GFP-Grb2 to the plasma membrane, followed by relocation to endosomal compartments.
  • The microscopy assay allows for both qualitative assessment of localization patterns and quantitative measurement of interaction strength.

Conclusions:

  • The developed microscopy assay provides a straightforward method for visualizing Grb2 recruitment and interactions in live mammalian cells.
  • This technique facilitates genome-wide screening for identifying novel Grb2-interacting proteins and understanding their sub-cellular localization.
  • Offers advantages over traditional methods like yeast-two-hybrid by enabling direct observation of protein complex formation at the site of interaction in a cellular context.