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Related Experiment Videos

Visualization of neural cell adhesion molecule by electron microscopy.

A K Hall, U Rutishauser

    The Journal of Cell Biology
    |June 1, 1987
    PubMed
    Summary

    Neural cell adhesion molecule (NCAM) forms were visualized using electron microscopy, revealing a distinct molecular structure with a central bend. Aggregates suggest NCAM molecules associate via their NH2-terminal binding sites, crucial for cell-cell adhesion.

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    Area of Science:

    • Cell Biology
    • Molecular Biology
    • Biophysics

    Background:

    • Neural cell adhesion molecule (NCAM) mediates cell-cell adhesion.
    • NCAM exists in various polypeptide forms, including 130- and 160-kD variants.
    • Understanding NCAM's molecular structure is key to elucidating its function in neural development and plasticity.

    Purpose of the Study:

    • To visualize the three-dimensional structure of individual NCAM molecules and their aggregates.
    • To investigate the role of the polysialic acid moiety in NCAM aggregation.
    • To map the binding sites of NCAM using specific antibodies.

    Main Methods:

    • Low angle rotary shadowing and freeze replication electron microscopy.
    • Enzymatic removal of polysialic acid.
    • Immunolabeling with monoclonal antibodies against defined NCAM epitopes.

    Main Results:

    • Individual NCAM molecules appear as rod-like structures with a central bend.
    • NCAM aggregates form pinwheel-like structures with molecules associating near the NH2 terminus.
    • Polysialic acid removal increased aggregate formation.
    • Antibody mapping confirmed NH2-terminal association in aggregates.

    Conclusions:

    • NCAM molecules aggregate via their NH2-terminal homophilic binding sites.
    • The central bend region influences the geometry of NCAM aggregates.
    • These findings provide insights into the molecular mechanisms of NCAM-mediated cell-cell adhesion.

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