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A highly specific gold nanoprobe for live-cell single-molecule imaging.

Cécile Leduc1, Satyabrata Si, Jérémie Gautier

  • 1LP2N, Université de Bordeaux, Institut d'Optique & CNRS UMR 5298, Talence, France.

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Summary

Researchers developed novel 5 nm gold nanoparticles, called GFP-nanobodies, for tracking proteins in live cells. This breakthrough overcomes limitations of probe size and photostability, enabling long-term observation of protein dynamics in crowded cellular environments.

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Area of Science:

  • Biophysics
  • Cell Biology
  • Nanotechnology

Background:

  • Single molecule tracking is crucial for understanding protein dynamics.
  • Existing probes face limitations in size and photostability, hindering long-term studies in crowded cellular environments.

Purpose of the Study:

  • To develop a novel optical probe for long-term, high-resolution single molecule tracking in live cells.
  • To overcome the limitations of current probes in terms of size and photostability.

Main Methods:

  • Functionalization of 5 nm gold nanoparticles with camelid antibody fragments (nanobodies) targeting green fluorescent proteins (GFPs).
  • Utilizing photothermal imaging for detection and tracking of the gold nanoparticles.
  • Application of the probes in vitro and in live cell cultures, including crowded intracellular environments.

Main Results:

  • Successfully developed and characterized GFP-nanobodies for high-affinity GFP labeling.
  • Demonstrated effective labeling and tracking of surface and intracellular GFP-proteins in crowded cellular structures.
  • Achieved arbitrarily long tracking periods due to the photostability of gold nanoparticles.

Conclusions:

  • GFP-nanobodies offer a versatile, highly specific, and photostable probe for single molecule tracking.
  • This technology enables unprecedented long-term observation of protein dynamics in challenging cellular environments.
  • The small size and high affinity of these probes open new avenues for studying subcellular protein behavior.