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On phasing the small-angle x-ray diffraction pattern from nerve myelin.

A E Blaurock

    Biophysical Journal
    |April 1, 1979
    PubMed
    Summary
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    The study reveals that nerve myelin swelling causes real changes in membrane profiles, challenging the assumption of a constant structure. Protein interdigitation, not measurement errors, explains these observed myelin profile variations.

    Area of Science:

    • Neuroscience
    • Biophysics
    • Structural Biology

    Background:

    • Previous studies, including Stamatoff and Krimm (1976), have analyzed nerve myelin swelling data.
    • The assumption of a constant membrane profile during myelin swelling has been widely accepted.

    Purpose of the Study:

    • To compare electron-density profiles derived from two different phase datasets of nerve myelin swelling.
    • To investigate the validity of the constant membrane profile assumption during myelin swelling.

    Main Methods:

    • Developed a method to phase swelling data from nerve myelin.
    • Computed and compared electron-density profiles using two distinct phase datasets.
    • Analyzed differences in membrane profiles at varying degrees of swelling.

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    Main Results:

    • Small but significant differences were observed in the membrane profiles between the two phasings.
    • These differences are unlikely to be due to measurement errors, indicating a real change in the myelin profile.
    • The findings suggest that the membrane profile is not constant during myelin swelling.

    Conclusions:

    • The assumption of a constant membrane profile during nerve myelin swelling is invalid.
    • Observed profile changes are attributed to the interdigitation of protein molecules between neighboring membranes.
    • The study proposes that Stamatoff and Krimm's determined phases are not valid for myelin swelling analysis.