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Related Experiment Videos

Phospholipid head-group conformations; intermolecular interactions and cholesterol effects

P L Yeagle, W C Hutton, C Huang

    Biochemistry
    |October 4, 1977
    PubMed
    Summary

    Phosphatidylcholine head groups in bilayers align parallel to the surface, facilitated by intermolecular interactions. Cholesterol disrupts this specific phospholipid bilayer organization.

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    Area of Science:

    • Biophysics
    • Structural Biology
    • Lipid Bilayer Dynamics

    Background:

    • Phosphatidylcholine and sphingomyelin are key components of biological membranes.
    • Understanding lipid head group orientation is crucial for membrane function.
    • Cholesterol is known to modulate membrane properties.

    Purpose of the Study:

    • To determine the orientation of the phosphorylcholine head group in phospholipid bilayers.
    • To investigate how cholesterol affects this orientation.
    • To elucidate the intermolecular interactions governing head group arrangement.

    Main Methods:

    • Utilizing 31P (1H) nuclear Overhauser effect (NOE) in 31P NMR spectroscopy.
    • Measuring NOE magnitude as a function of proton-decoupler frequency.

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  • Analyzing data from pure and mixed phospholipid systems, including deuterium-labeled phosphatidylcholine.

    • Main Results:

    • A significant NOE (40%) was observed in egg phosphatidylcholine bilayers, peaking at the N-methyl proton resonance.
    • In deuterium-labeled phosphatidylcholine, NOE originated from methylene protons adjacent to the phosphate.
    • Cholesterol addition disrupted intermolecular interactions in phosphatidylcholine bilayers.

    Conclusions:

    • The phosphorylcholine head group is oriented parallel to the bilayer surface.
    • Intermolecular interactions between the N-methyl and phosphate groups stabilize this orientation.
    • Cholesterol perturbs these specific intermolecular interactions within phosphatidylcholine bilayers.