Counterion-induced abnormal slowdown of F-actin diffusion across the isotropic-to-nematic phase transition.

Counterion-induced abnormal slowdown of F-actin diffusion across the isotropic-to-nematic phase transition. Research Abstract Details 

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Counterion-induced abnormal slowdown of F-actin diffusion across the isotropic-to-nematic phase transition. Abstract Text:

Jun He,Jorge Viamontes,Jay X Tang,Jun He,Jorge Viamontes,Jay X Tang,

We report an abnormal slowdown of the longitudinal diffusion of F-actin across the isotropic-to-nematic phase transition region. To probe the underlying physics of this counterintuitive discovery, we compared the diffusion of F-actin, microtubules and fd virus in F-actin solutions across the transition region and found the F-actin diffusion markedly different from the other two filament types. Also, the viscous drag probed by F-actin was found to increase sharply with [Mg(2+)] in the nematic but not in the isotropic state. Based on the experimental results, we propose that the abnormal slowdown is caused by the weak electrostatic attraction between actin filaments in the nematic phase, in which neighboring filaments in parallel associate with each other transiently as they collide due to thermal fluctuations.

Counterion-induced abnormal slowdown of F-actin diffusion across the isotropic-to-nematic phase transition. Publishing Authors By Initials

J He,J Viamontes,JX Tang,J He,J Viamontes,JX Tang,

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Counterion-induced abnormal slowdown of F-actin diffusion across the isotropic-to-nematic phase transition. Journal Published:

PUBLICATION TYPE: Research Support, U.S. Gov't,

Journal: Physical review letters

VOLUME: 99

Page Numbers: 068103

Journal Abbreviation: Phys. Rev. Lett.

ISSN: 0031-9007

DAY: 9

MONTH: 08

YEAR: 2007

Counterion-induced abnormal slowdown of F-actin diffusion across the isotropic-to-nematic phase transition. Information

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LANGUAGE: eng

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Grant and Affiliation Information for Counterion-induced abnormal slowdown of F-actin diffusion across the isotropic-to-nematic phase transition.

AFFILIATION: Department of Physics, Brown University, Rhode Island 02912, USA.

Country: United States

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MEDLINETA: Phys Rev Lett

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