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Single-molecule microscopy on model membranes reveals anomalous diffusion

G J Schütz1, H Schindler, T Schmidt

  • 1Institute for Biophysics, University of Linz, Austria.

Biophysical Journal
|August 1, 1997
PubMed
Summary
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A new analysis of lipid tracking data reveals membrane mobility variations. This method, using probability distributions of square displacements, identifies distinct mobility components and restricted diffusion in lipid membranes.

Area of Science:

  • Biophysics
  • Materials Science
  • Cell Biology

Background:

  • Lipid lateral mobility in phospholipid membranes is crucial for cellular functions.
  • Singer-Nicholson and Saffman-Delbrück models provide foundational understanding.
  • Fluorescence recovery after photobleaching (FRAP) offers ensemble-averaged diffusion data.

Purpose of the Study:

  • To introduce a novel analysis method for single-molecule tracking data.
  • To characterize lipid mobility in fluid and polymer-stabilized phospholipid systems.
  • To demonstrate the potential of single-molecule imaging for resolving membrane inhomogeneities.

Main Methods:

  • Analysis of probability distribution of square displacements for tracking data.
  • Single-molecule imaging to follow individual fluorescence-labeled lipids.

Related Experiment Videos

  • Investigation of fluid-supported phospholipid membranes and polymer-stabilized phospholipid monolayers.

    • Main Results:

    • Identified high-mobility (4.4 microns2/s) and low-mobility (0.07 microns2/s) components in fluid membranes.
    • Proposed the low-mobility component corresponds to the 'immobile fraction' seen in FRAP.
    • Visualized diffusion restricted to 140 nm corrals in polymer-stabilized systems.

    Conclusions:

    • The new analysis method, combined with single-molecule techniques, resolves membrane mobility inhomogeneities.
    • Achieves spatial resolution of 100 nm with minimal structural interference.
    • Offers a powerful tool for detailed characterization of membrane dynamics.