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Related Experiment Videos

Structural microtubule cap: stability, catastrophe, rescue, and third state.

Imre M Jánosi1, Denis Chrétien, Henrik Flyvbjerg

  • 1The Niels Bohr Institute, DK-2100 Copenhagen Ø, Denmark. flyvbjerg@nbi.dk

Biophysical Journal
|August 31, 2002
PubMed
Summary

Microtubules form a structural cap due to mechanical forces between straight tubulin and curved protofilaments. This cap explains microtubule dynamic instability, including polymerization, depolymerization, and rescue.

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Area of Science:

  • Cell Biology
  • Biophysics
  • Structural Biology

Background:

  • Microtubules are dynamic polymers essential for cell structure and function.
  • Tubulin dimers polymerize in a GTP-bound state but hydrolyze GTP to GDP within the microtubule lattice.
  • GDP-bound tubulin favors a curved conformation, creating internal stress within the straight microtubule polymer.

Purpose of the Study:

  • To investigate the mechanical tug-of-war between straight, GDP-bound tubulin and the microtubule lattice.
  • To propose a model for a structural cap at microtubule ends arising from these forces.
  • To explain key aspects of microtubule dynamic instability through this structural cap mechanism.

Main Methods:

  • Theoretical investigation of forces and configurations at microtubule ends.

Related Experiment Videos

  • Analysis of the mechanical consequences of GDP-tubulin's intrinsic curvature.
  • Modeling the properties and implications of a proposed structural cap.

    • Main Results:

    • A structural cap forms at microtubule ends due to the release of mechanical stress from curved GDP-tubulin.
    • This cap facilitates polymerization of GTP-tubulin and rapid depolymerization in its absence.
    • The model explains rescue phenomena, a meta-stable intermediate state, and the stabilization of tapered tips during growth.

    Conclusions:

    • The structural cap is a direct mechanical consequence of microtubule composition and elasticity.
    • This mechanism provides a physical basis for the widely accepted GTP-cap model of dynamic instability.
    • The findings offer a unified explanation for diverse experimental observations of microtubule dynamics.