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Related Experiment Videos

X-ray diffraction analysis of dehydrated myelin

N S Murthy, C R Worthington

    Biochimica Et Biophysica Acta
    |August 12, 1982
    PubMed
    Summary

    New X-ray diffraction data reveals a 14 A series in dry nerve myelin, suggesting ordered hydrocarbon chains in single bilayers and disordered chains in double bilayers and fluid phases. Cholesterol forms a bilayer, with the 14 A series likely representing another cholesterol phase.

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    Area of Science:

    • Biophysics
    • Neuroscience
    • Materials Science

    Background:

    • Nerve myelin structure is crucial for neuronal function and insulation.
    • Previous X-ray diffraction studies identified key spacings in myelin structure.

    Purpose of the Study:

    • To present improved X-ray diffraction data from dry nerve myelin.
    • To identify new structural spacings and elucidate molecular ordering within myelin layers.

    Main Methods:

    • Acquisition of high-resolution X-ray diffraction data from dry nerve myelin samples.
    • Analysis of diffraction patterns to determine structural spacings.

    Main Results:

    • Identification of a previously unreported 14 A spacing in addition to known spacings (approx. 150 A, 44 A, 34.6 A).
    • Evidence of ordered hydrocarbon chains in the single bilayer (approx. 60 A).
    • Indication of disordered hydrocarbon chains in the double bilayer (approx. 150 A) and fluid phase (approx. 44 A).
    • Confirmation that cholesterol exists as a bilayer (approx. 34.6 A).
    • Hypothesis that the 14 A series represents an additional cholesterol phase.

    Conclusions:

    • The study provides refined structural insights into dry nerve myelin.
    • Distinct ordering of hydrocarbon chains is observed depending on the myelin bilayer configuration.
    • Cholesterol's structural organization within myelin is further characterized.

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