Cooperation and competition in the collective drive by motor proteins: mean active force, fluctuations, and self-load. Issue 9 (15th February 2023)

• Record Type: Journal Article
• Authors: Karan, Chitrak; Chaudhuri, Debasish
• Is Part Of: Soft matter. Volume 19:Issue 9(2023)
• Page Start: 1834
• Page End: 1843
• Publication Date: 2023-02-15
• Subjects: Soft condensed matter -- Periodicals; 530.413
• DOI: 10.1039/d2sm01183b
• Languages: English
• ISSNs: 1744-683X

Abstract

Abstract : We consider a bio-filament under the collective drive of motor proteins to obtain an active Langevin description of its dynamics. The competition between motor proteins generates self-load captured by an effective temperature. Abstract : We consider the dynamics of a bio-filament under the collective drive of motor proteins. They are attached irreversibly to a substrate and undergo stochastic attachment–detachment with the filament to produce a directed force on it. We establish the dependence of the mean directed force and force correlations on the parameters describing the individual motor proteins using analytical theory and direct numerical simulations. The effective Langevin description for the filament motion gives mean-squared displacement, asymptotic diffusion constant, and mobility leading to an effective temperature. Finally, we show how competition between motor protein extensions generates a self-load, describable in terms of the effective temperature, affecting the filament motion.