The Force-Velocity Relation for Growing Biopolymers

Details The Force-Velocity Relation for Growing Biopolymers The Force-Velocity Relation for Growing Biopolymers

2000-03-16

arxiv.org/abs/physics/0003038v1

Physics

Biological Physics

Latex source, 9 postscript figures, uses psfig.sty

Scientific paper

10.1103/PhysRevE.62.7082

The process of force generation by the growth of biopolymers is simulated via a Langevin-dynamics approach. The interaction forces are taken to have simple forms that favor the growth of straight fibers from solution. The force-velocity relation is obtained from the simulations for two versions of the monomer-monomer force field. It is found that the growth rate drops off more rapidly with applied force than expected from the simplest theories based on thermal motion of the obstacle. The discrepancies amount to a factor of three or more when the applied force exceeds 2.5kT/a, where a is the step size for the polymer growth. These results are explained on the basis of restricted diffusion of monomers near the fiber tip. It is also found that the mobility of the obstacle has little effect on the growth rate, over a broad range.

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