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Energy transfer in lipid bilayers.

T N Estep, T E Thompson

    Biophysical Journal
    |May 1, 1979
    PubMed
    Summary
    This summary is machine-generated.

    Fluorescence quenching in lipid bilayers was measured, showing intensity decreases predictably with quencher concentration. This energy transfer phenomenon, crucial for membrane research, was accurately modeled by new and existing theories.

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    Area of Science:

    • Biophysics
    • Photochemistry
    • Materials Science

    Background:

    • Fluorescence quenching is vital for understanding molecular interactions in lipid bilayers.
    • Energy transfer between donor and acceptor chromophores influences emission intensity.
    • Accurate theoretical models are needed to interpret experimental data.

    Purpose of the Study:

    • To measure fluorescence quenching in lipid bilayers due to energy transfer.
    • To compare experimental results with theoretical predictions.
    • To develop and validate models for predicting fluorescence quenching.

    Main Methods:

    • Utilized dilute, random arrays of donor and acceptor chromophores in lipid bilayers.
    • Measured fluorescence emission intensity as a function of quencher concentration.

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  • Compared experimental data with theoretical expressions, including a new simple relation and Tweet's equation.

    • Main Results:

    • Observed fluorescence intensity followed the same functional dependence on quencher concentration in planar and spherical lipid systems.
    • Experimental quenching levels were accurately predicted by both the newly derived and Tweet's equations.
    • Significant quenching occurred even at large donor-acceptor separations, exceeding the Förster critical distance.

    Conclusions:

    • The study validates theoretical models for fluorescence quenching in lipid bilayers.
    • The findings provide a reliable method for quantifying energy transfer in membrane systems.
    • Results have direct applications in membrane research and understanding molecular dynamics.