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Colchicine binding to antibodies

J Wolff, H G Capraro, A Brossi

    The Journal of Biological Chemistry
    |August 10, 1980
    PubMed
    Summary
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    Researchers developed high-titer antibodies to colchicine, which mimic tubulin binding but offer distinct chemical specificity. These antibodies can restore tubulin polymerization and prevent colchicine-induced fluorescence.

    Area of Science:

    • Biochemistry
    • Immunology
    • Cell Biology

    Background:

    • Colchicine is a potent inhibitor of microtubule polymerization, crucial for cell division.
    • Understanding colchicine's interaction with tubulin is key to developing anti-cancer drugs.
    • Specific antibodies can serve as valuable tools for studying molecular interactions.

    Purpose of the Study:

    • To generate and characterize antibodies against colchicine.
    • To investigate the binding properties and specificity of these antibodies.
    • To assess the functional utility of colchicine antibodies in biological systems.

    Main Methods:

    • Antibodies were produced in rabbits by immunizing with a deacetylcolchicine-bovine serum albumin conjugate.
    • Antibody-colchicine binding affinity was determined using equilibrium dissociation constants (Kd).

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  • Specificity was assessed by comparing antibody binding to tubulin binding characteristics.

    • Main Results:

    • High-titer antibodies with colchicine dissociation constants of 5-17 nM were successfully generated.
    • Antibody binding site specificity for colchicine's A and B rings mirrored tubulin, but tolerated C ring modifications.
    • Antibody binding did not induce fluorescence, unlike tubulin, and could prevent colchicine-induced fluorescence.

    Conclusions:

    • Novel antibodies to colchicine exhibit unique binding properties distinct from tubulin.
    • These antibodies can functionally interfere with colchicine's effects on tubulin polymerization.
    • Colchicine antibodies represent a promising tool for biochemical and cell biology research.