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Bent fatty acid chains in lecithin bilayers.

B G McFarland, H M McConnell

    Proceedings of the National Academy of Sciences of the United States of America
    |June 1, 1971
    PubMed
    Summary

    Phospholipid fatty acid chains in lecithin bilayers exhibit a bent conformation, with rigid, tilted chains near head groups and flexible, parallel chains near methyl termini. This structure allows for varied chain flexibility within packed bilayers.

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    Area of Science:

    • Biophysics
    • Materials Science
    • Structural Biology

    Background:

    • Phospholipids are key components of biological membranes, forming bilayer structures.
    • Understanding the dynamics and conformation of phospholipid fatty acid chains is crucial for membrane function.
    • Paramagnetic resonance spectroscopy is a powerful tool for probing molecular dynamics in lipid bilayers.

    Purpose of the Study:

    • To analyze the conformational and motional properties of phospholipid fatty acid chains within lecithin bilayers.
    • To investigate the relationship between chain conformation and packing in multi-lamellar arrays.
    • To elucidate the role of chain dynamics in maintaining bilayer integrity.

    Main Methods:

    • Analysis of paramagnetic resonance spectra from phospholipid spin labels.
    • Study of multi-lamellar arrays of lecithin bilayers.
    • Characterization of label orientations and high-frequency random motions.

    Main Results:

    • Identified a long-lived average bending in fatty acid chains (>10^-8 sec).
    • Observed rigid, tilted chains (~30 degrees to normal) near polar head groups.
    • Found flexible, parallel chains near terminal methyl groups, indicating differential mobility.

    Conclusions:

    • The bent chain conformation facilitates the packing of phospholipids into planar lamellar arrays.
    • This structural adaptation accommodates varying motional freedom along the fatty acid chain.
    • The findings provide insights into the structural adaptability and dynamic behavior of lipid bilayers.

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