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Self-organization of the MinE protein ring in subcellular Min oscillations

DSpace at IIT Bombay

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Title Self-organization of the MinE protein ring in subcellular Min oscillations
 
Creator DERR, J
HOPPER, JT
SAIN, A
RUTENBERG, AD
 
Subject division-site selection
escherichia-coli
cell-division
model
localization
placement
dynamics
system
middle
cycle
 
Description We model the self-organization of the MinE ring that is observed during subcellular oscillations of the proteins MinD and MinE within the rod-shaped bacterium Escherichia coli. With a steady-state approximation, we can study the MinE ring generically-apart from the other details of the Min oscillation. Rebinding of MinE to depolymerizing MinD-filament tips controls MinE-ring formation through a scaled cell shape parameter (r) over tilde. We find two types of E-ring profiles near the filament tip: either a strong plateaulike E ring controlled by one-dimensional diffusion of MinE along the bacterial length or a weak cusplike E ring controlled by three-dimensional diffusion near the filament tip. While the width of a strong E ring depends on (r) over tilde, the occupation fraction of MinE at the MinD-filament tip is saturated and hence the depolymerization speed does not depend strongly on (r) over tilde. Conversely, for weak E rings both (r) over tilde and the MinE to MinD stoichiometry strongly control the tip occupation and hence the depolymerization speed. MinE rings in vivo are close to the threshold between weak and strong, and so MinD-filament depolymerization speed should be sensitive to cell shape, stoichiometry, and MinE-rebinding rate. We also find that the transient to MinE-ring formation is quite long in the appropriate open geometry for assays of ATPase activity in vitro, explaining the long delays of ATPase activity observed for smaller MinE concentrations in those assays without the need to invoke cooperative MinE activity.
 
Publisher AMER PHYSICAL SOC
 
Date 2011-07-16T23:42:43Z
2011-12-26T12:50:00Z
2011-12-27T05:35:55Z
2011-07-16T23:42:43Z
2011-12-26T12:50:00Z
2011-12-27T05:35:55Z
2009
 
Type Article
 
Identifier PHYSICAL REVIEW E, 80(1), -
1539-3755
http://dx.doi.org/10.1103/PhysRevE.80.011922
http://dspace.library.iitb.ac.in/xmlui/handle/10054/4562
http://hdl.handle.net/10054/4562
 
Language en