Jan 28, 2016

On the Importance of Hydrodynamic Interactions in the Stepping Kinetics of Kinesin

BioRxiv : the Preprint Server for Biology
Dave ThirumalaiZhechun Zhang

Abstract

Conventional kinesin walks by a hand-over-hand mechanism on the microtubule (MT) by taking ∼ 8 nm discrete steps, and consumes one ATP molecule per step. The time needed to complete a single step is on the order of twenty microseconds. We show, using simulations of a coarse-grained model of the complex containing the two motor heads, the MT, and the coiled coil that in order to obtain quantitative agreement with experiments for the stepping kinetics hydrodynamic interactions (HI) have to be included. In simulations without hydrodynamic interactions spanning nearly twenty microseconds not a single step was completed in hundred trajectories. In sharp contrast, nearly 14% of the steps reached the target binding site within 6 microseconds when HI were included. Somewhat surprisingly, there are qualitative differences in the diffusion pathways in simulations with and without HI. The extent of movement of the trailing head of kinesin on the MT during the diffusion stage of stepping is considerably greater in simulations with HI than in those without HI. Our results suggest that inclusion of HI is crucial in the accurate description of motility of other motors as well.

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Mentioned in this Paper

KIF2B
Biochemical Pathway
Gait, Drop Foot
Cell Motility
Kinesin Activity
Motility
Coiled-Coil Domain
Kinesin
Microtubules
Ligand Binding Domain

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