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Lateral diffusion in planar lipid bilayers

P F Fahey, D E Koppel, L S Barak

    Science (New York, N.Y.)
    |January 21, 1977
    PubMed
    Summary
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    Lipid diffusion in membranes is rapid, exceeding 10(-7) cm²/s. Cholesterol slows this diffusion, while solvents can accelerate it, impacting membrane dynamics.

    Area of Science:

    • Biophysics
    • Membrane Biology
    • Physical Chemistry

    Background:

    • Lipid bilayer membranes are fundamental to cell structure and function.
    • Understanding lipid dynamics is crucial for cellular processes.
    • Lateral diffusion governs membrane fluidity and molecular interactions.

    Purpose of the Study:

    • To directly measure the lateral diffusion coefficients of fluorescent lipid analogs in lipid bilayer membranes.
    • To investigate the effects of cholesterol and hydrocarbon solvents on lipid diffusion.

    Main Methods:

    • Utilized fluorescence correlation spectroscopy (FCS) for direct measurements.
    • Employed fluorescent lipid analogs to track molecular movement.
    • Studied various lipid systems above their transition temperatures.

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    Main Results:

    • Observed self-diffusion coefficients (D) greater than 10(-7) cm²/s for multiple lipid systems.
    • Found that cholesterol, at a 1:2 mole ratio in egg lecithin, reduced diffusion coefficients approximately twofold.
    • Determined that retained hydrocarbon solvents could increase diffusion coefficients by two- to threefold.

    Conclusions:

    • Lipid lateral diffusion in membranes is a rapid process above transition temperatures.
    • Cholesterol acts as a modulator, decreasing lipid mobility.
    • Hydrocarbon solvents can significantly enhance lipid diffusion rates, influencing membrane fluidity.