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Related Experiment Videos

Movement and force produced by a single myosin head

J E Molloy1, J E Burns, J Kendrick-Jones

  • 1Department of Biology, University of York, UK.

Nature
|November 9, 1995
PubMed
Summary

A single myosin head (S1) generates force and movement during muscle contraction. This study reveals the working stroke is approximately 4 nm, shorter than previously thought, with forces of at least 1.7 pN.

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Area of Science:

  • Muscle physiology
  • Molecular motor mechanics
  • Biophysics

Background:

  • Muscle contraction relies on myosin-actin interactions and ATP hydrolysis.
  • Previous studies used filamentous myosin and heavy meromyosin (HMM) to investigate these interactions.
  • Discrete mechanical events were observed, attributed to stochastic single myosin molecule interactions.

Purpose of the Study:

  • To determine if a single myosin subfragment-1 (S1), a single myosin head, can independently generate force and movement.
  • To quantify the mechanical properties of single acto-S1 interactions.
  • To reconcile observed displacement amplitudes with structural data.

Main Methods:

  • Utilized an optical-tweezers transducer to measure the force and displacement generated by single myosin S1 molecules.

Related Experiment Videos

  • Analyzed the stochastic interactions between single myosin S1 heads and actin filaments.
  • Measured isometric force generation under controlled conditions.

    • Main Results:

    • Demonstrated that a single myosin S1 head acts as an independent generator of force and movement.
    • Quantified the underlying movement (working stroke) of a single acto-S1 interaction at approximately 4 nm.
    • Measured an average force of at least 1.7 pN generated by S1 or HMM under isometric conditions.

    Conclusions:

    • Single myosin heads are capable of generating force and movement independently.
    • The working stroke of a single myosin head is approximately 4 nm, aligning with structural data.
    • This research provides new insights into the fundamental mechanics of muscle contraction at the single-molecule level.