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Proteins show rotational as well as lateral diffusion across the membrane. The lateral diffusion of proteins was confirmed through the cell fusion experiment where mouse and human cells were fused, resulting in hybrid cells. When the human and mouse cells fused, the specific membrane proteins on human and mouse cells were marked with the red and green-fluorescent markers, respectively. Initially, the red and green fluorescence was located on the respective hemisphere of the cell. As time...
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Single-Molecule Diffusion and Assembly on Polymer-Crowded Lipid Membranes
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Accurate Single-Particle Tracking and Diffusion Measurement in Freestanding Lipid Bilayers and Model Membranes.

Lily Anne Van Ye1, Richard D Michael1, Joshua J Meyer1

  • 1Wheaton College, Dept. of Chemistry, Wheaton, Illinois 60187, United States.

Analytical Chemistry
|December 8, 2025
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Summary

This study introduces a dual-mode fluorescence microscope for lipid bilayers, enhancing diffusion measurements. The new method improves accuracy and overcomes challenges in studying molecular dynamics in membranes.

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Area of Science:

  • Biophysics
  • Materials Science
  • Analytical Chemistry

Background:

  • Accurate diffusion characterization in lipid bilayers is crucial for understanding molecular interactions.
  • Freestanding lipid bilayers present challenges like fragility, curvature, and low signal-to-background ratios.
  • Existing methods struggle with accurate measurements at higher concentrations, limiting studies.

Purpose of the Study:

  • To develop an improved method for accurate single-particle tracking (SPT) in lipid bilayers.
  • To overcome limitations of current techniques in measuring molecular diffusion.
  • To provide a robust platform for studying membrane dynamics.

Main Methods:

  • A dual-mode fluorescence microscope combining widefield SPT and confocal fluorescence correlation spectroscopy (FCS).
  • Utilizing a microelectrode cavity array (MECAopto-inv chip) for bilayer formation.
  • Employing FCS to calibrate SPT algorithms and correct for optical aberrations.

Main Results:

  • Demonstrated improved accuracy in diffusion constant measurements through FCS calibration.
  • Showed that calibration mitigates measurement bias at high particle concentrations.
  • Resolved variability in diffusion constants reported in previous studies.

Conclusions:

  • The developed dual-mode microscopy offers a robust and accurate method for studying lipid bilayer dynamics.
  • This approach is broadly applicable to planar bilayer systems and various membrane studies.
  • Provides a quantitative benchmark for future research in nanopores, protein assemblies, and ion transport.