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Related Experiment Videos

Ionic and nucleotide requirements for microtubule polymerization in vitro.

J B Olmsted, G G Borisy

    Biochemistry
    |July 1, 1975
    PubMed
    Summary

    This study details the optimal ionic and nucleotide conditions for in vitro microtubule assembly. Magnesium and GTP are crucial for tubulin polymerization, influencing both rate and extent.

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    [Microtubule dynamics in cultured cells].

    Ontogenez·2001

    Area of Science:

    • Biochemistry
    • Cell Biology
    • Structural Biology

    Background:

    • Microtubules are essential cytoskeletal components involved in various cellular processes.
    • Understanding the in vitro assembly of microtubules is crucial for studying their dynamics and function.

    Purpose of the Study:

    • To characterize the ionic and nucleotide requirements for in vitro microtubule polymerization using purified brain tubulin.
    • To determine optimal conditions for maximal microtubule assembly rate and extent.

    Main Methods:

    • Purification of tubulin protein via temperature-dependent assembly-disassembly cycles.
    • Viscometry was employed to measure microtubule polymerization.
    • Systematic variation of buffer concentrations (Pipes, NaCl), pH, and divalent cation concentrations (Ca2+, Mg2+) to assess their impact on polymerization.

    Main Results:

    • Maximal polymerization occurred at 0.1 M Pipes, pH 6.6-6.8, and physiological salt concentrations (150 mM).
    • Magnesium (Mg2+) is essential for polymerization, with optimal rate and extent at stoichiometric concentrations relative to tubulin.
    • Guanosine triphosphate (GTP) is required, with stoichiometric levels sufficient for maximal polymerization; a Mg2+-GTP complex is suggested as the active substrate.

    Conclusions:

    • Optimal in vitro microtubule assembly requires specific ionic conditions, including Pipes buffer, physiological salt concentrations, and crucially, magnesium and GTP.
    • Magnesium plays a vital role in promoting both the rate and extent of microtubule polymerization, likely via a Mg2+-GTP complex.
    • These findings provide a detailed understanding of the biochemical requirements for microtubule formation, essential for further research into microtubule-associated proteins and cellular functions.

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