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Related Experiment Videos

Single-molecule anisotropy imaging.

G S Harms1, M Sonnleitner, G J Schütz

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

Biophysical Journal
|November 5, 1999
PubMed
Summary
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Single-molecule anisotropy imaging reveals enhanced lipid mobility in fluid membranes and allows observation of molecular rotation in gel phases. This technique offers new insights into membrane dynamics and protein conformational changes.

Area of Science:

  • Membrane biophysics
  • Single-molecule imaging
  • Lipid dynamics

Background:

  • Understanding lipid diffusion and rotation is crucial for membrane function.
  • Existing methods have limitations in simultaneously measuring lateral and rotational diffusion.
  • Supported phospholipid membranes provide a model system for studying membrane properties.

Purpose of the Study:

  • To develop and apply a novel method, single-molecule anisotropy imaging, for simultaneous study of lipid diffusion.
  • To investigate the lateral and rotational diffusion of lipids in fluid and gel phases.
  • To explore the potential of this technique for observing protein conformational motions.

Main Methods:

  • Single-molecule anisotropy imaging technique.
  • Utilizing fluorescence-labeled lipids (rhodamine) on supported phospholipid membranes.

Related Experiment Videos

  • Analysis of single-molecule trajectories and mean square angular displacement.

    • Main Results:

    • Determined rotational diffusion constant (D(rot) = 7 x 10^7 rad^2/s) and lateral diffusion constant (D(lat) = 3.5 x 10^-8 cm^2/s) in fluid membranes.
    • Observed significantly enhanced lipid mobility on the nanosecond timescale, consistent with the free-volume model.
    • Measured slow rotational mobility (D(rot) = 1.2 rad^2/s) in gel phase membranes (DPPC lipids).

    Conclusions:

    • Single-molecule anisotropy imaging is a powerful tool for simultaneously measuring lateral and rotational diffusion of lipids.
    • The technique provides insights into lipid dynamics across different membrane phases.
    • This method holds promise for studying conformational dynamics of individual proteins over millisecond to second timescales.