Myosin motors drive long range alignment of actin filaments.

The Journal of Biological Chemistry
Tariq ButtJustin E Molloy

Abstract

The bulk alignment of actin filament sliding movement, powered by randomly oriented myosin molecules, has been observed and studied using an in vitro motility assay. The well established, actin filament gliding assay is a minimal experimental system for studying actomyosin motility. Here, we show that when the assay is performed at densities of actin filaments approaching those found in living cells, filament gliding takes up a preferred orientation. The oriented patterns of movement that we have observed extend over a length scale of 10-100 microm, similar to the size of a mammalian cell. We studied the process of filament alignment and found that it depends critically upon filament length and density. We developed a simple quantitative measure of filament sliding orientation and this enabled us to follow the time course of alignment and the formation and disappearance of oriented domains. Domains of oriented filaments formed spontaneously and were separated by distinct boundaries. The pattern of the domain structures changed on the time scale of several seconds and the collision of neighboring domains led to emergence of new patterns. Our results indicate that actin filament crowding may play an important role in structuring ...Continue Reading

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Methods Mentioned

BETA
motility assays
rheology
fluorescence imaging
electron microscopy
Assay
fluorescence microscopy
motility assay
transmission electron microscopy

Software Mentioned

ImageJ
Matlab
Excel
GMimPro

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