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Related Experiment Videos

The effect of solution composition on microtubule dynamic instability.

M J Schilstra1, P M Bayley, S R Martin

  • 1Division of Physical Biochemistry, National Institute for Medical Research, London, U.K.

The Biochemical Journal
|August 1, 1991
PubMed
Summary

Microtubule dynamic instability, crucial for cell processes, is modulated by solution conditions. Glycerol concentration, magnesium, and calcium ions significantly impact tubulin exchange and microtubule dynamics.

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Area of Science:

  • Biochemistry
  • Cell Biology
  • Biophysics

Background:

  • Microtubules are essential cytoskeletal polymers involved in cell division and intracellular transport.
  • Dynamic instability, characterized by polymerization and depolymerization, governs microtubule function.
  • Understanding factors influencing dynamic instability is key to comprehending cellular processes.

Purpose of the Study:

  • To investigate the impact of various buffer components on microtubule dynamic instability.
  • To assess how solution conditions affect tubulin dimer exchange into steady-state microtubules.
  • To interpret findings within the Lateral Cap model framework.

Main Methods:

  • Studied tubulin dimer exchange into microtubules under varying solution conditions.

Related Experiment Videos

  • Assessed the effects of glycerol, magnesium (Mg2+), calcium (Ca2+), and phosphate ions.
  • Utilized the exchange method to quantify dynamic instability.

    • Main Results:

    • Increased glycerol concentration (>2 M) suppressed microtubule exchange and dynamic instability.
    • Enhanced Mg2+ (up to 17 mM) and Ca2+ (up to 0.4 mM) increased tubulin exchange.
    • Phosphate ions (150 mM) showed minimal effect on microtubule dynamics.
    • Findings align with the Lateral Cap model, particularly concerning the tubulin-GDP dissociation rate constant.

    Conclusions:

    • Solution conditions, including glycerol, Mg2+, and Ca2+ concentrations, critically regulate microtubule dynamic instability.
    • The Lateral Cap model effectively explains the observed variations in microtubule dynamics.
    • Modulating tubulin exchange offers a means to control microtubule activity.