The dynamics in the bacterial chemosensory arrays

Ady Vaknin*

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

Bacterial chemoreceptors form two-dimensional sensory arrays on the cell membrane. These sensory arrays, which contain thousands of molecules, detect chemical changes in the environment of the bacterial cell and accordingly control its swimming behaviour, allowing these bacteria to track chemical gradients. It was recently demonstrated that stimulus, by ligand binding, alters the physical organization of these arrays, with dynamics that follow an apparent logarithmic time dependence. Such non-exponential dynamics is often observed in glass-like systems in which the internal dynamics slow down exponentially as the system approaches its equilibrium state. In a few of these "glassy" systems it was also demonstrated that after altering the equilibrium state of the system for a certain time tw the ensuing relaxation scales with tw. Here, we examined the relaxation of the receptor arrays in the bacterium E. coli after a perturbation by ligand binding for varying periods of times. We find that changing the time tw, during which the stimulus was present, affects mostly the deviation of the receptor arrays from equilibrium, but the dynamics of the relaxation seem to be independent of tw. A possible interpretation is discussed.

Original languageAmerican English
Title of host publication15th International Conference on Transport in Interacting Disordered Systems, TIDS 2013
PublisherAmerican Institute of Physics Inc.
Pages34-40
Number of pages7
ISBN (Print)9780735412460
DOIs
StatePublished - 2014
Event15th International Conference on Transport in Interacting Disordered Systems, TIDS 2013 - Sant Feliu de Guixols, Spain
Duration: 1 Sep 20135 Sep 2013

Publication series

NameAIP Conference Proceedings
Volume1610
ISSN (Print)0094-243X
ISSN (Electronic)1551-7616

Conference

Conference15th International Conference on Transport in Interacting Disordered Systems, TIDS 2013
Country/TerritorySpain
CitySant Feliu de Guixols
Period1/09/135/09/13

Keywords

  • Aging
  • Bacteria
  • Chemotaxis
  • Dynamics
  • Receptor clusters

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