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Multiplexed imaging for probing RAS-RAF interactions in living cells.

Mohammad Ahmad1, Liviu Movileanu2

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Summary

Researchers developed a novel FRET biosensor to visualize human RAS (HRAS)-CRAF protein interactions in living cells. This method allows concurrent probing of epidermal growth factor receptor (EGFR) activation and HRAS-CRAF complex formation.

Keywords:
Binding affinityCell signalingEGFRGTPaseIntracellular measurementsMulticolor microscopyProtein engineeringProtein-protein interactions

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Area of Science:

  • Cellular signaling and molecular biology
  • Biophysics and biosensing technologies
  • Cancer research and drug discovery

Background:

  • RAS proteins are key regulators of cellular signaling pathways, mediating responses to extracellular stimuli.
  • Measuring transient protein-protein interactions (PPIs) like RAS-effector binding in living cells remains a significant challenge.
  • Existing methods often lack the sensitivity required for heterogeneous cellular environments.

Purpose of the Study:

  • To develop and validate a sensitive intermolecular Förster Resonance Energy Transfer (FRET) biosensing approach for visualizing HRAS-CRAF interactions in real-time within living cells.
  • To concurrently probe epidermal growth factor receptor (EGFR) activation and downstream HRAS-CRAF complex formation.
  • To quantitatively assess transient PPIs in both cell-free and cellular contexts.

Main Methods:

  • Development of an intermolecular FRET biosensor tailored for detecting HRAS-CRAF complex formation.
  • Application of the FRET biosensor in living cells to visualize and localize HRAS-CRAF interactions upon EGFR activation.
  • Concurrent probing of EGFR activation and HRAS-CRAF complex formation within single cells.
  • Quantitative FRET measurements in cell-free systems to validate the biosensor's performance.

Main Results:

  • Successful visualization and localization of HRAS-CRAF interactions at cellular and organelle membranes in response to EGF stimulation.
  • Demonstration of concurrent probing of EGFR activation and HRAS-CRAF complex formation in single cells.
  • Quantitative FRET measurements confirmed the ability to assess transient PPIs in cell-free environments.
  • Validation of the biosensing approach by identifying an EGFR-binding compound as an inhibitor of HRAS-CRAF interactions.

Conclusions:

  • The developed FRET biosensing strategy provides a sensitive and specific method for visualizing and quantifying HRAS-CRAF PPIs in living cells.
  • This approach enables the simultaneous study of upstream receptor activation and downstream effector complex formation.
  • The findings lay the groundwork for investigating the spatiotemporal dynamics of various signaling networks and for drug discovery efforts targeting PPIs.