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Related Experiment Videos

Tubulin-associated nucleoside diphosphokinase.

M Jacobs, P Huitorel

    European Journal of Biochemistry
    |September 1, 1979
    PubMed
    Summary

    Microtubule protein contains a nucleoside diphosphokinase (NDP kinase) enzyme. This NDP kinase activity is associated with tubulin and increases during microtubule assembly, suggesting a functional role.

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    Area of Science:

    • Cell Biology
    • Biochemistry
    • Molecular Biology

    Background:

    • Microtubules are dynamic polymers essential for cellular structure and function.
    • Microtubule-associated proteins (MAPs) influence tubulin polymerization.
    • The enzymatic activities within purified microtubule preparations are not fully characterized.

    Purpose of the Study:

    • To identify and characterize enzymatic activities present in purified microtubule protein.
    • To investigate the association of these activities with tubulin and MAPs.
    • To determine the functional relevance of observed enzymatic activities during microtubule assembly.

    Main Methods:

    • Preparation of microtubule protein through polymerization-dissociation cycles.
    • Assay of nucleoside diphosphokinase (NDP kinase) activity.
    • Analysis of enzyme properties including molecular weight and substrate specificity.
    • Investigation of enzyme activity during ATP-dependent microtubule assembly.

    Main Results:

    • Microtubule protein exhibited significant NDP kinase activity (EC 2.7.4.6).
    • The NDP kinase existed in both low-molecular-weight and multimeric forms associated with tubulin and MAPs.
    • GDP bound to tubulin was identified as a substrate for the NDP kinase.
    • NDP kinase activity increased sevenfold during microtubule assembly.

    Conclusions:

    • Microtubule protein contains a distinct NDP kinase activity associated with tubulin.
    • This NDP kinase is not intrinsic to tubulin dimers or MAPs.
    • The observed increase in NDP kinase activity during microtubule assembly suggests a role in microtubule dynamics or function.

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