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Related Experiment Videos

Myosin-V is a mechanical ratchet.

J Christof M Gebhardt1, Anabel E-M Clemen, Johann Jaud

  • 1Physics Department E22, Technical University of Munich, James-Franck-Strasse, D-85748 Garching, Germany.

Proceedings of the National Academy of Sciences of the United States of America
|May 30, 2006
PubMed
Summary

Myosin-V motors act as mechanical ratchets under high backward forces, enabling ATP-independent backward movement along actin filaments. This backward motion is processive, unlike forward movement, revealing a key mechanical asymmetry.

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Area of Science:

  • Biophysics
  • Molecular Biology
  • Cellular Mechanics

Background:

  • Myosin-V is a molecular motor that moves along actin filaments.
  • Previous studies focused on low-force myosin-V motion.
  • Understanding motor behavior under varying forces is crucial for cellular function.

Purpose of the Study:

  • Investigate myosin-V's response to high forces.
  • Characterize the mechanical asymmetry of myosin-V motion.
  • Develop a model explaining the observed force-velocity dependence.

Main Methods:

  • Single-molecule assays.
  • Application of controlled backward and forward forces.
  • Analysis of myosin-V step behavior.

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Main Results:

  • High backward forces induce rapid, processive backward steps.
  • Backward motion is independent of ATP binding and hydrolysis.
  • Forward forces do not induce ATP-independent forward steps.
  • A model explains this asymmetry via lever arm conformation modulating actin binding.

Conclusions:

  • Myosin-V exhibits pronounced mechanical asymmetry, acting as a ratchet under backward load.
  • Lever arm conformation is critical for modulating actin binding strength and motor behavior.
  • Understanding force-velocity relationships is key to myosin-V's cellular roles.