An Element Of Determinism In A Stochastic Flagellar Motor Switch

Physics > Biological Physics arXiv:1504.05631 (physics) [Submitted on 22 Apr 2015] Title:An Element of Determinism in a Stochastic Flagellar Motor Switch Authors:Li Xie, Tuba Altindal, Xiao-Lun Wu View a PDF of the paper titled An Element of Determinism in a Stochastic Flagellar Motor Switch, by Li Xie and 1 other authors View PDF

Abstract:Marine bacterium Vibrio alginolyticus uses a single polar flagellum to navigate in an aqueous environment. Similar to Escherichia coli cells, the polar flagellar motor has two states; when the motor is counter-clockwise, the cell swims forward and when the motor is clockwise, the cell swims backward. V. alginolyticus also incorporates a direction randomization step at the start of the forward swimming interval by flicking its flagellum. To gain an understanding on how the polar flagellar motor switch is regulated, distributions of the forward $\Delta_{f}$ and backward $\Delta_{b}$ intervals are investigated herein. We found that the steady-state probability density functions, $P(\Delta_{f})$ and $P(\Delta_{b})$, of freely swimming bacteria are strongly peaked at a finite time, suggesting that the motor switch is not Poissonian. The short-time inhibition is sufficiently strong and long lasting, i.e., several hundred milliseconds for both intervals, which is readily observed and characterized. Treating motor reversal dynamics as a first-passage problem, which results from conformation fluctuations of the motor switch, we calculated $P(\Delta_{f})$ and $P(\Delta_{b})$ and found good agreement with the measurements.

Subjects:	Biological Physics (physics.bio-ph)
Cite as:	arXiv:1504.05631 [physics.bio-ph]
(or arXiv:1504.05631v1 [physics.bio-ph] for this version)
https://doi.org/10.48550/arXiv.1504.05631 Focus to learn more arXiv-issued DOI via DataCite
Related DOI:	https://doi.org/10.1371/journal.pone.0141654 Focus to learn more DOI(s) linking to related resources

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From: Xiao-Lun Wu [view email] [v1] Wed, 22 Apr 2015 01:53:10 UTC (3,943 KB) Full-text links:

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