Transient response to chemotactic stimuli in Escherichia coli.
نویسندگان
چکیده
منابع مشابه
Modeling the chemotactic response of Escherichia coli to time-varying stimuli.
In their natural environment, cells need to extract useful information from complex temporal signals that vary over a wide range of intensities and time scales. Here, we study how such signals are processed by Escherichia coli during chemotaxis by developing a general theoretical model based on receptor adaptation and receptor-receptor cooperativity. Measured responses to various monotonic, osc...
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Adaptation of the chemotaxis sensory pathway of the bacterium Escherichia coli is integral for detecting chemicals over a wide range of background concentrations, ultimately allowing cells to swim towards sources of attractant and away from repellents. Its biochemical mechanism based on methylation and demethylation of chemoreceptors has long been known. Despite the importance of adaptation for...
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Information-carrying signals in the real world are often obscured by noise. A challenge for any system is to filter the signal from the corrupting noise. This task is particularly acute for the signal transduction network that mediates bacterial chemotaxis, because the signals are subtle, the noise arising from stochastic fluctuations is substantial, and the system is effectively acting as a di...
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The bacterium E. coli maneuvers itself to regions with high chemoattractant concentrations by performing two stereotypical moves: ‘runs’, in which it moves in near straight lines, and ‘tumbles’, in which it does not advance but changes direction randomly. The duration of each move is stochastic and depends upon the chemoattractant concentration experienced in the recent past. We relate this sto...
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Experimental mastitis was induced by inoculating rear right quarters of 10 healthy cows with 10(3) cfu of Escherichia coli. The chemotactic responses of peripheral blood polymorphonuclear leukocytes at d-6, -5, -2, -1, and immediately prior to inoculation were measured. Chemiluminescence of polymorphonuclear leukocytes was measured immediately prior to inoculation. Severity of the experimental ...
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ژورنال
عنوان ژورنال: Proceedings of the National Academy of Sciences
سال: 1975
ISSN: 0027-8424,1091-6490
DOI: 10.1073/pnas.72.8.3235