Single-Molecule Rotation for EGFR Conformational Dynamics in Live Cells

Area of Science:

• Molecular and Cellular Dynamics
• Biophysics
• Nanotechnology

Background:

• Understanding protein dynamics in live cells is crucial for deciphering complex regulatory mechanisms.
• Existing tools struggle to capture protein conformational changes over time at the required spatiotemporal scales.
• Visualizing molecular dynamics in real-time remains a significant challenge in cell biology.

Purpose of the Study:

• To develop an advanced imaging technique for monitoring protein conformational dynamics in live cells.
• To investigate the structural dynamics of membrane proteins, specifically the epidermal growth factor receptor (EGFR).
• To provide a non-perturbing method for observing protein-protein interactions and conformational changes.

Main Methods:

• Development of gyroscopic plasmonic nanoparticles for single-molecule stroboscopic imaging.
• Utilizing rotational and lateral velocities of nanoparticles to track protein movements.
• Monitoring the rotational motion of epidermal growth factor receptor (EGFR) in live cellular environments.

Main Results:

• Successfully demonstrated a novel method for imaging conformational changes in live cells without molecular perturbation.
• Replicated protein-protein interactions and conformational dynamics using nanoparticle rotational and lateral velocities.
• Deciphered previously undiscovered structural dynamics of the membrane protein EGFR.

Conclusions:

• The developed gyroscopic plasmonic nanoparticle probes offer a powerful strategy for visualizing protein assemblies and conformational changes.
• This technique provides unique insights into the molecular mechanisms underlying receptor dynamics.
• Enables real-time, non-invasive monitoring of protein behavior critical for understanding cellular regulation.