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Sedimentation studies on membrane vesicles.

J Boom, W S Bont, H P Hofs

    Molecular Biology Reports
    |September 1, 1976
    PubMed
    Summary
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    Analytical centrifugation revealed that membrane vesicles exist in distinct size classes. This finding provides insight into the structural heterogeneity of vesicle populations in biological samples.

    Area of Science:

    • Biochemistry
    • Cell Biology
    • Biophysics

    Background:

    • Vesicles are crucial for cellular transport and signaling.
    • Understanding vesicle size distribution is key to elucidating their function.
    • Previous methods lacked precision in characterizing vesicle heterogeneity.

    Purpose of the Study:

    • To determine the size distribution of vesicles in membrane preparations.
    • To investigate the physical properties influencing vesicle sedimentation.
    • To establish if vesicles exist in continuous or discrete size ranges.

    Main Methods:

    • Analytical centrifugation was employed to analyze vesicle sedimentation.
    • Sedimentation profiles were recorded under controlled conditions (rotation speed, temperature).

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  • Discontinuous distribution of sedimentation coefficients indicated discrete size classes.

    • Main Results:

    • A characteristic sedimentation profile for membranous material was observed.
    • Vesicle sedimentation exhibited a discontinuous distribution.
    • This discontinuity implies the presence of a limited number of vesicle size classes.

    Conclusions:

    • Membrane vesicles are not uniformly distributed by size.
    • Vesicles predominantly exist in a few specific size classes.
    • Analytical centrifugation is a powerful tool for characterizing vesicle heterogeneity.