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Related Experiment Videos

Microinjection of Ca++-calmodulin causes a localized depolymerization of microtubules.

C Keith, M DiPaola, F R Maxfield

    The Journal of Cell Biology
    |December 1, 1983
    PubMed
    Summary

    Calcium-saturated calmodulin rapidly disrupts cellular microtubules and stress fibers. This calcium-dependent regulation of the cytoskeleton by calmodulin is crucial for cellular processes like mitosis.

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    Area of Science:

    • Cell Biology
    • Molecular Biology
    • Biochemistry

    Background:

    • Calmodulin is a key calcium-binding protein involved in cellular signaling.
    • Microtubules and stress fibers are essential components of the cytoskeleton, crucial for cell structure and function.

    Purpose of the Study:

    • To investigate the role of calcium-saturated calmodulin in cytoskeletal disruption.
    • To determine the calcium-dependent mechanism of calmodulin's effect on microtubules and stress fibers.

    Main Methods:

    • Microinjection of calcium-saturated calmodulin and calcium-free calmodulin into living fibroblasts.
    • Manipulation of intracellular calcium levels to assess potentiation effects.
    • Analysis of cytoskeletal disruption via microscopy.

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    Main Results:

    • Calcium-saturated calmodulin caused rapid, localized disruption of microtubules and stress fibers.
    • The effect was specific to calcium-bound calmodulin; calcium ions alone had minimal impact.
    • Pre-loading with calcium-free calmodulin potentiated disruption upon calcium elevation.
    • High intracellular calcium levels were required for significant disruption in uninjected cells.
    • A 2:1 molar ratio of calmodulin to tubulin dimer was sufficient to disrupt microtubules.

    Conclusions:

    • Calmodulin regulates microtubule calcium lability in a calcium-dependent, localized manner.
    • These findings support a model where calmodulin controls microtubule polymerization, particularly in areas of high local concentration like the mitotic spindle.