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Physical force considerations in model and biological membranes.

R P Rand, V A Parsegian

    Canadian Journal of Biochemistry and Cell Biology = Revue Canadienne De Biochimie Et Biologie Cellulaire
    |August 1, 1984
    PubMed
    Summary

    Understanding phospholipid bilayer forces is key to membrane fusion. Hydration repulsion dominates short distances, while electrostatic forces act at longer ranges, both influenced by hydration. Divalent cations can induce rupture rather than controlled fusion.

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    Area of Science:

    • Biophysics
    • Physical Chemistry

    Background:

    • Phospholipid bilayers are fundamental to cell membranes.
    • Understanding interbilayer forces is crucial for membrane dynamics like fusion.

    Purpose of the Study:

    • To elucidate the general principles governing forces within and between phospholipid bilayers.
    • To investigate the influence of hydration and electrostatic forces on bilayer interactions.
    • To apply these findings to the process of phospholipid vesicle fusion.

    Main Methods:

    • Measurement of forces between phospholipid bilayers at varying separations.
    • Characterization of hydration forces based on water polarization.
    • Analysis of electrostatic double-layer forces and their modification by hydration.
    • Measurement of bilayer lateral pressures and compressibilities at thermodynamic equilibrium.

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    Main Results:

    • Strong hydration repulsion dominates interactions within 30 Å, common to hydrophilic surfaces.
    • Electrostatic double-layer forces at >30 Å are modulated by long-range hydration.
    • Bilayer pressures and compressibilities are lipid-specific and nonlinear.
    • Divalent cations promote attraction but lead to vesicle rupture, not controlled fusion.

    Conclusions:

    • Hydration forces are a primary barrier to vesicle fusion.
    • Controlled biological membrane fusion likely requires localized biochemical changes alongside hydration force reduction.
    • Current models of divalent cation-mediated fusion may not accurately reflect biological processes.