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Updated: Jan 25, 2026

Single-Molecule Tracking Microscopy - A Tool for Determining the Diffusive States of Cytosolic Molecules
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Resolving Cytosolic Diffusive States in Bacteria by Single-Molecule Tracking.

Julian Rocha1, Jacqueline Corbitt1, Ting Yan1

  • 1Department of Chemistry, University of Virginia, Charlottesville, Virginia.

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|April 30, 2019
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Summary

Analyzing single protein trajectories in cells reveals molecular interactions. This new method accurately characterizes intracellular diffusive states by accounting for experimental biases and using Monte Carlo simulations.

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Area of Science:

  • Cellular biology
  • Biophysics
  • Molecular dynamics

Background:

  • Single protein trajectory analysis in the cell cytosol offers insights into molecular interactions.
  • Characterizing intracellular diffusive states is challenging due to simplifying assumptions in analytical methods.

Purpose of the Study:

  • To develop a method for accurately resolving multiple intracellular diffusive states.
  • To account for experimental biases in single-molecule tracking data analysis.

Main Methods:

  • Utilized an empirical data analysis framework based on Monte Carlo simulations of confined Brownian motion.
  • Applied the framework to camera-based and MINFLUX-based single-molecule tracking data.
  • Incorporated stepwise increasing time windows for averaging displacements to determine state switching timescales.

Main Results:

  • Successfully resolved multiple intracellular diffusive states with sufficient trajectory data and bias correction.
  • Determined diffusion coefficients, populations of diffusive states, and timescales of diffusive state switching.
  • Demonstrated the framework's generalizability to various cell geometries and tracking parameters (2D/3D).

Conclusions:

  • Time-averaged diffusion analysis of single-molecule tracking data provides quantitative insights into molecular binding and unbinding reactions.
  • This approach is crucial for understanding cellular functions involving rapidly diffusing molecules.