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Related Experiment Videos

Motor proteins transporting cargos.

K B Zeldovich1, J-F Joanny, J Prost

  • 1UMR 168 CNRS, Institut Curie, Section de Recherche, 26 rue d'Ulm, 75248 Paris Cedex 05, France.

The European Physical Journal. E, Soft Matter
|May 10, 2005
PubMed
Summary
This summary is machine-generated.

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Thermal fluctuations of cargo disrupt molecular motor function, slowing transport velocity. Optimal motor friction maximizes velocity by balancing thermal effects and motor dynamics.

Area of Science:

  • Biophysics
  • Molecular Biology
  • Cellular Mechanics

Background:

  • Processive motor proteins like kinesin and myosin-V utilize ATP hydrolysis for movement along cytoskeletal filaments.
  • These motors transport vesicles and protein complexes, crucial for intracellular functions.
  • Cargo attachment is mediated by motor light chains.

Purpose of the Study:

  • To investigate the impact of cargo's thermal fluctuations on motor-cargo complex velocity.
  • To model the motor-cargo system using a linear elastic spring for the light chain and a two-state model for the motor.
  • To understand how cargo properties influence motor efficiency.

Main Methods:

  • Numerical solution of Fokker-Planck equations governing motor motion.
  • Modeling the light chain as a linear elastic spring.

Related Experiment Videos

  • Employing a two-state model for one- and two-headed molecular motors.

    • Main Results:

    • Mean velocity of the motor-cargo complex decreases with increasing cargo spring softness (reduced stiffness).
    • Larger cargo size (increased friction coefficient) also reduces motor velocity.
    • A non-monotonic relationship was observed: velocity peaks at a specific motor friction for a given cargo size.

    Conclusions:

    • Thermal fluctuations of the cargo impede molecular motor performance.
    • The interplay between thermal fluctuation length, motor diffusion, and filament periodicity dictates optimal motor friction.
    • Findings aid interpretation of single-molecule experiments, such as bead assays, involving molecular motors.