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Variation in swimming speed of Escherichia coli in response to attractant

DSpace at IIT Bombay

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Title Variation in swimming speed of Escherichia coli in response to attractant
 
Creator DEEPIKA, D
KARMAKAR, R
TIRUMKUDULU, MS
VENKATESH, KV
 
Subject BACTERIAL CHEMOTAXIS
PHOSPHOTRANSFERASE-SYSTEM
ADAPTATION KINETICS
SIGNAL-TRANSDUCTION
ASPARTATE
MOTILITY
SUGARS
CHEMORECEPTOR
TRAJECTORIES
RECEPTOR
Chemotaxis
Bacterial motility
Bacterial motor
Escherichia coli
 
Description It is well known that Escherichia coli executes chemotactic motion in response to chemical cues by modulating the flagellar motor bias alone. However, previous studies have reported the possibility of variation in run speed in the presence of attractants although it is unclear whether bacteria can deliberately modulate their swimming speeds in response to environmental cues or if the motor speeds are hardwired. By studying the detailed motion of cells in a uniform concentration of glucose and its non-metabolizable analogue, we show that changing concentrations may be accompanied by variation in the swimming speed. For a fixed run duration, cells exposed to the attractants achieved a higher peak-swimming speed after a tumble compared with that in plain motility buffer. Our experiments using the mutant strain lacking the Trg sensor show no change in swimming speed with varying concentrations of the non-metabolizable analogue, suggesting that sensing may play a role in the observed variation of swimming speed.
 
Publisher SPRINGER
 
Date 2016-01-14T10:55:34Z
2016-01-14T10:55:34Z
2015
 
Type Article
 
Identifier ARCHIVES OF MICROBIOLOGY, 197(2)211-222
0302-8933
1432-072X
http://dx.doi.org/10.1007/s00203-014-1044-5
http://dspace.library.iitb.ac.in/jspui/handle/100/17412
 
Language en