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Lipid-mediated protein interaction in membranes

S Marcelja

    Biochimica Et Biophysica Acta
    |November 11, 1976
    PubMed
    Summary

    Membrane proteins alter surrounding lipid structures, influencing lipid ordering and temperature dependence. This lipid-mediated interaction can cause protein aggregation, particularly at low lipid-protein ratios.

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    Area of Science:

    • Biophysics
    • Membrane Biology
    • Computational Biology

    Background:

    • Membrane integral proteins interact with surrounding lipids.
    • Lipid ordering near proteins is crucial for membrane function.

    Purpose of the Study:

    • To investigate the effects of non-specific protein-lipid interactions on membrane lipid ordering.
    • To elucidate the mechanism of lipid-mediated interactions between membrane proteins.

    Main Methods:

    • Utilized molecular field theory to model lipid ordering.
    • Analyzed the spatial extent and temperature dependence of lipid structure modification around proteins.

    Main Results:

    • Lipid structure modification extends beyond the immediate annulus, affecting 2-3 layers.
    • Lipid ordering within the annulus shows altered temperature dependence, becoming continuous at low lipid/protein ratios.
    • A sensitive, lipid-mediated interaction between proteins arises from altered lipid ordering.

    Conclusions:

    • Non-specific protein-lipid interactions significantly impact membrane lipid organization.
    • Altered lipid ordering mediates protein-protein interactions, potentially leading to aggregation.
    • This interaction is highly dependent on bulk lipid order.

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