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The effects of Ca2+ on lipid diffusion.

E Blatt, W L Vaz

    Chemistry and Physics of Lipids
    |October 1, 1986
    PubMed
    Summary

    Calcium ions (Ca2+) affect lipid diffusion in DMPC-water systems. Above the phase transition temperature, Ca2+ alters probe mobility, while below it, Ca2+ immobilizes lipid molecules by excluding water and tightening lipid packing.

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    Area of Science:

    • Biophysics
    • Materials Science
    • Physical Chemistry

    Background:

    • Lipid bilayers are fundamental to cell membranes.
    • Understanding lipid diffusion is crucial for membrane function.
    • Calcium ions are known to interact with lipid headgroups.

    Purpose of the Study:

    • To investigate the effects of Ca2+ on lipid diffusion in dimyristoylphosphatidylcholine (DMPC) multilamellar systems.
    • To differentiate between probe and lipid motion in the presence of Ca2+.
    • To elucidate the mechanism of Ca2+-induced changes in lipid packing and dynamics.

    Main Methods:

    • Time-resolved phosphorescence anisotropy
    • Steady-state fluorescence polarization
    • Fluorescence recovery after photobleaching (FRAP)

    Main Results:

    • Above Tm: Ca2+ increased segmental motion of phosphorescent probes but slowed diffusion of fluorescent and lateral diffusion probes, indicating altered interface structure.
    • Below Tm: Increasing Ca2+ concentrations progressively slowed diffusion of all probes, with significant immobilization around 500 mM.
    • Ca2+ association with lipid phosphate groups and water exclusion were identified as key factors.

    Conclusions:

    • Ca2+ significantly impacts lipid diffusion and dynamics in DMPC bilayers, with distinct effects above and below the phase transition temperature.
    • The observed effects are attributed to Ca2+ binding to lipid headgroups, leading to altered hydration and packing.
    • These findings provide insights into the role of divalent cations in modulating membrane physical properties.

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