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Negatively charged phospholipids and their position in the cholesterol affinity sequence.

P W van Dijck

    Biochimica Et Biophysica Acta
    |July 19, 1979
    PubMed
    Summary

    Cholesterol preferentially binds to specific phospholipids based on their charge and type. This study reveals a hierarchy of phospholipid affinity for cholesterol, crucial for understanding lipid interactions.

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    Area of Science:

    • Biochemistry
    • Physical Chemistry
    • Membrane Biophysics

    Background:

    • Cholesterol is a vital lipid component of cell membranes.
    • Phospholipids form the lipid bilayer, and their interactions with cholesterol influence membrane properties.
    • Understanding cholesterol-phospholipid interactions is key to deciphering membrane structure and function.

    Purpose of the Study:

    • To investigate the preferential binding of low concentrations of cholesterol to various phospholipid mixtures.
    • To determine the influence of phospholipid charge and type on cholesterol association.
    • To establish an affinity order of phospholipids for cholesterol.

    Main Methods:

    • Differential scanning calorimetry (DSC) was used to study lipid mixtures.
    • Mixtures exhibiting a gel phase miscibility gap were specifically selected for analysis.

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  • Cholesterol's association patterns with different phospholipid combinations were analyzed.

    • Main Results:

    • Cholesterol preferentially associated with negatively charged phospholipids (phosphatidylserine, phosphatidylglycerol) when mixed with phosphatidylethanolamine.
    • In mixtures with phosphatidylcholine, cholesterol associated with the negatively charged phospholipid, and also with phosphatidylcholine if it had a low transition temperature.
    • Cholesterol showed preferential association with sphingomyelin over phosphatidylserine when sphingomyelin had a high transition temperature.

    Conclusions:

    • Phospholipids exhibit a distinct order of decreasing affinity for cholesterol: sphingomyelin > phosphatidylserine, phosphatidylglycerol > phosphatidylcholine > phosphatidylethanolamine.
    • The findings provide insights into the complex phase behavior and molecular interactions within lipid bilayers.
    • This hierarchy of affinity is critical for models of membrane lipid organization and cholesterol homeostasis.