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Related Concept Videos

Protein Dynamics in Living Cells01:19

Protein Dynamics in Living Cells

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Different fluorescence-based techniques are used to study the protein dynamics in living cells. These techniques include FRAP, FRET, and PET.
Fluorescent recovery after photobleaching (FRAP) is a fluorescent-protein-based detection technique used to quantify protein movement rates within the cell. This method exposes a small portion of the cell to an intense laser beam. The laser beam causes permanent photobleaching of the fluorophore-tagged proteins in the exposed region. As the bleached...
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Related Experiment Video

Updated: May 21, 2025

Monitoring Conformational Dynamics of Single Unmodified Proteins using Plasmonic Nanotweezers
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Probing heterogeneous binding events at single molecule level by single nanoparticle tracking.

Yi Wang1, Liting Qi1, Le Sun1

  • 1State Key Laboratory of Organic Electronics and Information Displays & Institute of Advanced Materials (IAM), Nanjing University of Posts & Telecommunications, 9 Wenyuan Road, Nanjing, 210023, China.

Talanta
|March 20, 2025
PubMed
Summary

This study presents a single-molecule sensing platform using nanoparticle tracking for biomarker detection. It achieves a low detection limit for neuron specific enolase and differentiates specific from nonspecific binding events.

Keywords:
Distance-dependent diffusion velocityOptical imagingSingle nanoparticle countingSingle nanoparticle mappingSingle-molecule biosensing

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Area of Science:

  • Biophysics
  • Nanotechnology
  • Biomarker Detection

Background:

  • Single-molecule analysis is vital for biological research and clinical diagnostics.
  • Optical imaging techniques like single-nanoparticle tracking offer powerful tools for molecular interaction studies.

Purpose of the Study:

  • To develop an advanced single-molecule sensing platform for sensitive biomarker detection.
  • To characterize molecular interactions and surface modifications at the single-molecule level.

Main Methods:

  • Utilizing dark-field microscopy to track single nanoparticles over a sensing surface.
  • Digitally counting individual nanoparticles to determine detection limits.
  • Quantifying nanoparticle velocities to analyze transient and specific binding events.

Main Results:

  • Achieved a detection limit of 7.5 ng/mL for neuron specific enolase.
  • Successfully differentiated specific from nonspecific binding by analyzing nanoparticle velocities.
  • Revealed surface modification heterogeneity through precise nanoparticle trajectory analysis.

Conclusions:

  • The developed platform enables sensitive biomarker detection and detailed molecular interaction studies.
  • Excluding nonspecific binding events significantly enhances detection performance.
  • This technology offers insights into molecular heterogeneity at the single-molecule level.