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Updated: Mar 9, 2026

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How to Measure Load-Dependent Kinetics of Individual Motor Molecules Without a Force-Clamp.

J Sung1, K I Mortensen2, J A Spudich3

  • 1Department of Cellular and Molecular Pharmacology, The Howard Hughes Medical Institute, University of California, San Francisco, CA, United States.

Methods in Enzymology
|January 8, 2017
PubMed
Summary

Harmonic Force Spectroscopy (HFS) measures how molecular interactions change with force. This new method reveals how ADP release from cardiac myosin II is load-dependent, explaining muscle contraction mechanics.

Keywords:
CardiomyopathyForce spectroscopyMolecular motorMyosinOptical trapOptical tweezerSingle molecule

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Area of Science:

  • Biophysics
  • Molecular Biology
  • Biochemistry

Background:

  • Single-molecule force spectroscopy techniques (optical trapping, magnetic trapping, atomic force microscopy) offer insights into biological processes at nanoscale.
  • Optical trapping, with its high resolution, is crucial for studying motor proteins and molecular interactions.
  • Understanding force-dependent kinetics is key to elucidating molecular mechanisms in biological systems.

Purpose of the Study:

  • To introduce Harmonic Force Spectroscopy (HFS), a novel method for measuring load-dependent kinetics of transient molecular interactions.
  • To apply HFS to study the interaction between human β-cardiac myosin II and actin filaments.
  • To provide a practical guide to the HFS method, including its setup, protocol, theory, and analysis.

Main Methods:

  • Utilized a conventional dual-beam optical trap.
  • Implemented a simple harmonic oscillation of the sample stage to apply controlled forces.
  • Developed a straightforward experimental protocol and data analysis for HFS.

Main Results:

  • Successfully measured the load-dependent kinetics of transient molecular interactions.
  • Demonstrated that the ADP release rate of individual human β-cardiac myosin II molecules exhibits exponential dependence on applied load.
  • Provided insights into the molecular mechanism underlying the force-velocity relationship in cardiac muscle contraction.

Conclusions:

  • Harmonic Force Spectroscopy (HFS) is an efficient and simple method for studying molecular kinetics under force.
  • The observed load-dependent ADP release rate offers a mechanistic explanation for cardiac muscle's force-velocity properties.
  • HFS provides a valuable tool for advancing our understanding of molecular motors and force-dependent biological processes.