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Related Experiment Videos

An oscillatory mode for microtubule assembly.

F Pirollet1, D Job, R L Margolis

  • 1INSERM U244, Département de Recherche Fondamentale, Grenoble, France.

The EMBO Journal
|November 1, 1987
PubMed
Summary

Tubulin polymerization can exhibit complex oscillatory behavior or simple monotonic kinetics depending on conditions. Changes in protein, nucleotide, or magnesium ion concentrations influence these polymerization dynamics.

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Area of Science:

  • Biochemistry
  • Cell Biology
  • Biophysics

Background:

  • Tubulin polymerization is fundamental for microtubule dynamics in cells.
  • Microtubule assembly can follow different kinetic pathways, including monotonic and oscillatory mechanisms.

Purpose of the Study:

  • To investigate the conditions that govern tubulin polymerization kinetics.
  • To analyze the characteristics of oscillatory polymerization and its regulation.

Main Methods:

  • In vitro polymerization assays of purified tubulin.
  • Kinetic analysis of microtubule assembly under varying conditions.
  • Characterization of microtubule populations (number and length) at different time points.

Main Results:

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  • Tubulin polymerization can switch between monotonic and oscillatory kinetics.
  • Oscillations involve significant cyclic changes in polymer mass and microtubule distribution.
  • Polymerization amplitude is sensitive to protein, nucleotide (GTP, GDP, GMPpNp), magnesium ion, and GTP regenerating system concentrations.
  • Increased free nucleotide (GTP or GDP) concentration shifts polymerization from oscillatory to monotonic.

Conclusions:

  • Conditions such as nucleotide concentration critically control tubulin polymerization pathways.
  • Understanding these dynamics is crucial for comprehending microtubule assembly regulation.
  • The study reveals a sensitive switch between distinct polymerization mechanisms.