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Related Experiment Videos

Force production by depolymerizing microtubules: a theoretical study.

M I Molodtsov1, E L Grishchuk, A K Efremov

  • 1Department of Molecular, Cellular, and Developmental Biology, University of Colorado, Boulder, CO 80309, USA.

Proceedings of the National Academy of Sciences of the United States of America
|March 16, 2005
PubMed
Summary
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Kinetochore microtubules (MTs) power chromosome movement during cell division. A new model shows MT disassembly stores energy in tubulin bonds, generating force via a protofilament power-stroke for efficient mechanical work.

Area of Science:

  • Cell Biology
  • Biophysics
  • Molecular Mechanics

Background:

  • Chromosome movement during mitosis relies on energy from kinetochore microtubule (MT) depolymerization.
  • A specialized coupling between kinetochores and MT plus ends is hypothesized to convert chemical energy into mechanical work.
  • Understanding this energy transduction is crucial for comprehending cellular mechanics and the efficiency of force-generating mechanisms.

Purpose of the Study:

  • To investigate the mechanism of force generation during microtubule disassembly.
  • To analyze how energy from GTP hydrolysis is stored and utilized within the microtubule lattice.
  • To evaluate the efficiency of different coupling device designs in energy transduction.

Main Methods:

  • Utilized a recently developed molecular-mechanical model of microtubules.

Related Experiment Videos

  • Focused on changes in tubulin dimer conformation during MT disassembly.
  • Simulated the process of energy storage and force generation based on bond deformations.

    • Main Results:

    • All energy from polymerization-associated GTP hydrolysis can be stored as deformations in longitudinal bonds between tubulin dimers.
    • Optimal energy utilization does not necessitate weakening of lateral bonds between tubulin dimers.
    • Maximum force generation is achieved through a protofilament power-stroke mechanism when coupling devices allow full lateral bond dissociation.

    Conclusions:

    • Microtubule disassembly is a key mechanism for storing and releasing energy to power cellular processes like chromosome movement.
    • The molecular-mechanical model provides insights into the efficient conversion of chemical energy into mechanical force.
    • The design of the coupling device significantly impacts the efficiency of force generation during microtubule depolymerization.