Issue
EPL
Volume 87, Number 2, July 2009
Article Number 28002
Number of page(s) 6
Section Interdisciplinary Physics and Related Areas of Science and Technology
DOI http://dx.doi.org/10.1209/0295-5075/87/28002
Published online 29 July 2009
EPL, 87 (2009) 28002
DOI: 10.1209/0295-5075/87/28002

Enhancement of the processivity of kinesin-transported cargo by myosin V

F. Berger, M. J. I. Müller and R. Lipowsky

Max Planck Institute of Colloids and Interfaces - 14424 Potsdam, Germany, EU

florian.berger@mpikg.mpg.de

received 19 March 2009; accepted in final form 30 June 2009; published July 2009
published online 29 July 2009

Abstract
Intracellular transport by molecular motors proceeds in two steps: long-range transport along microtubules and local delivery via actin filaments. A recent in vitro experiment has revealed that the actin-based motor myosin V can diffuse along microtubules and can enhance the processivity of cargos pulled by the microtubule-based motor kinesin-1 (ALI M. Y. et al., Proc. Natl. Acad. Sci. U.S.A., 105 (2008) 4691). Here we present a stochastic model for cargo transport by a directional motor (kinesin) and a diffusing motor (myosin). By using a subset of the experimental data of Ali et al. to adjust our model parameters, we are able to describe all experimental results. In our model, the myosins do not influence kinesin's motion and only act as tethers which allow the kinesin to rebind. Furthermore we find that the run length of the cargo increases exponentially with the number of myosins.

PACS
87.16.Nn - Motor proteins (myosin, kinesin, dynein).
87.15.hj - Biomolecules: structure and physical properties: Transport dynamics.
87.10.Mn - Biological and medical physics: Stochastic modeling.

© EPLA 2009