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Force-velocity relation for growing biopolymers.

A E Carlsson1

  • 1Department of Physics, Washington University, St. Louis, Missouri 63130-4899, USA.

Physical Review. E, Statistical Physics, Plasmas, Fluids, and Related Interdisciplinary Topics
|December 2, 2000
PubMed
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Biopolymer growth simulations reveal how fiber orientation impacts force generation. Specific alignments with obstacles significantly reduce growth velocity due to monomer diffusion effects.

Area of Science:

  • Biophysics
  • Polymer Physics
  • Computational Biology

Background:

  • Biopolymer formation is crucial in biological processes.
  • Understanding force generation during growth is key to cellular mechanics.
  • Existing theories often simplify interactions at growth interfaces.

Purpose of the Study:

  • To simulate biopolymer fiber growth and force generation.
  • To investigate the influence of monomer-monomer interactions on fiber morphology.
  • To analyze the force-velocity relationship under different growth conditions.

Main Methods:

  • Langevin dynamics simulations were employed.
  • Monomer-monomer interaction forces were modeled to favor straight fiber growth.
  • Simulations considered growth against a flat obstacle.

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Main Results:

  • Force-velocity relations were obtained for two distinct force fields.
  • Corrections to analytic theories were evaluated, showing small deviations for most orientations.
  • Significant reductions in fiber velocity were observed when the fiber surface was parallel to the obstacle.

Conclusions:

  • Monomer diffusion properties near the fiber tip explain velocity reductions.
  • Obstacle mobility has minimal impact on growth rate across a wide parameter range.
  • Simulation results refine theoretical models of biopolymer force generation.