A stochastic model for the stepwise motion in actomyosin dynamics

Details A stochastic model for the stepwise motion in actomyosin dynamics A stochastic model for the stepwise motion in actomyosin dynamics

2003-05-06

arxiv.org/abs/cond-mat/0305115v1

Physics

Condensed Matter

Soft Condensed Matter

9 pages, 4 figures

Scientific paper

A jump-diffusion process is proposed to describe the displacements performed by single myosin heads along actin filaments during the rising phases. The process consists of the superposition of a Wiener and a jump process, with jumps originated by sequences of Poisson-distributed energy-supplying pulses. In a previous paper, the amplitude of the jumps was described by a mixture of two Gaussian distributions. To embody the effects of ATP hydrolysis, we now refine such a model by assuming that the jumps' amplitude is described by a mixture of three Gaussian distributions. This model has been inspired by the experimental data of T. Yanagida and his co-workers concerning observations at single molecule processes level.

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