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Related Experiment Video

Updated: May 30, 2026

Motility of Single Molecules and Clusters of Bi-Directional Kinesin-5 Cin8 Purified from S. cerevisiae Cells
10:46

Motility of Single Molecules and Clusters of Bi-Directional Kinesin-5 Cin8 Purified from S. cerevisiae Cells

Published on: February 2, 2022

Conformational changes, diffusion and collective behavior in monomeric kinesin-based motility.

Kerwyn Casey Huang1, Christian Vega, Ajay Gopinathan

  • 1Department of Bioengineering, Stanford University, Stanford, CA 94305, USA.

Journal of Physics. Condensed Matter : an Institute of Physics Journal
|August 25, 2011
PubMed
Summary
This summary is machine-generated.

This study presents a detailed molecular model for kinesin motor protein motility. The model reveals how power stroke size and microtubule interactions influence motor speed and movement, highlighting cooperative effects in motor pairs.

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Area of Science:

  • Biophysics
  • Molecular Biology
  • Cellular Mechanics

Background:

  • Molecular motors convert chemical energy into mechanical work for intracellular transport.
  • Existing models for monomeric kinesin motility simplify complex processes, limiting insights into microscopic contributions.

Purpose of the Study:

  • To develop a detailed molecular-level model of monomeric kinesin motility.
  • To elucidate the contributions of conformational changes and biased diffusion to motor dynamics.
  • To investigate the cooperative function of kinesin motor pairs.

Main Methods:

  • Developed a detailed molecular-level model for monomeric kinesin.
  • Incorporated conformational changes (power strokes) and biased diffusion into the model.
  • Analyzed the impact of microscopic parameters on motor velocity and run length.

Main Results:

  • Mean velocity is most sensitive to power stroke size.
  • Run length distribution is primarily influenced by microtubule bias potential, with tunable dependence on power stroke under load.
  • Motor pairs exhibit cooperative function, enhancing motility in both directions.

Conclusions:

  • A detailed mechanochemical model is crucial for dissecting microscopic parameter contributions to kinesin dynamics.
  • Understanding these dynamics is key to comprehending intracellular transport and motor protein function.
  • Cooperative action of motor pairs offers a mechanism for enhanced cargo transport.