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Related Experiment Videos

Phosphatidylcholesterol bilayers. A model for phospholipid-cholesterol interaction.

M K Jain, F Ramirez, T M McCaffrey

    Biochimica Et Biophysica Acta
    |August 14, 1980
    PubMed
    Summary

    Divalent cations induce bilayer organization and a phase transition in O-(1,2-dipalmitoyl-sn-glycero-3-phosphoryl)cholesterol dispersions. Monovalent cations do not induce these effects, suggesting a novel one-dimensional model for calcium-induced structural changes.

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    Area of Science:

    • Lipid bilayer self-assembly
    • Phase transitions in lipid systems
    • Biophysical characterization of membrane components

    Background:

    • O-(1,2-dipalmitoyl-sn-glycero-3-phosphoryl)cholesterol (DSPC) is a key lipid component.
    • Understanding lipid behavior in aqueous dispersions is crucial for biomembrane studies.
    • Cation interactions with phospholipids influence membrane structure and dynamics.

    Purpose of the Study:

    • To investigate the effect of monovalent and divalent cations on DSPC dispersions.
    • To characterize the structural organization and phase transition behavior of DSPC in the presence of cations.
    • To propose a model explaining cation-induced structural changes.

    Main Methods:

    • Freeze-fracture electron microscopy
    • Negative staining electron microscopy

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  • Liposome swelling assays
  • Differential scanning calorimetry (DSC)

    • Main Results:

    • Aqueous dispersions of DSPC with divalent cations formed multilamellar vesicles.
    • Divalent cation salts of DSPC exhibited a thermotropic phase transition with a large cooperative unit (n>250 for Ca2+).
    • Monovalent cation salts of DSPC did not show a thermotropic phase transition.

    Conclusions:

    • Divalent cations, particularly Ca2+, induce bilayer organization and a highly cooperative phase transition in DSPC dispersions.
    • A linear array model is proposed where Ca2+ bridges DSPC molecules, leading to one-dimensional cooperative units.
    • DSPC in the presence of Ca2+ acts as a restricted analog of glycerophospholipid-cholesterol bilayers.