dorsal/arxiv
View SchemaCooperative Model of Bacterial Sensing
| Authors | Yu Shi, Thomas Duke |
|---|---|
| Categories | |
| ArXiv ID | physics/9901052 |
| URL | https://arxiv.org/abs/physics/9901052 |
| DOI | 10.1103/PhysRevE.58.6399 |
| Journal | Phys. Rev. E 58, 6399-6406 (1998) |
Abstract
Bacterial chemotaxis is controlled by the signalling of a cluster of receptors. A cooperative model is presented, in which coupling between neighbouring receptor dimers enhances the sensitivity with which stimuli can be detected, without diminishing the range of chemoeffector concentration over which chemotaxis can operate. Individual receptor dimers have two stable conformational states: one active, one inactive. Noise gives rise to a distribution between these states, with the probability influenced by ligand binding, and also by the conformational states of adjacent receptor dimers. The two-state model is solved, based on an equivalence with the Ising model in a randomly distributed magnetic field. The model has only two effective parameters, and unifies a number of experimental findings. According to the value of the parameter comparing coupling and noise, the signal can be arbitrarily sensitive to changes in the fraction of receptor dimers to which ligand is bound. The counteracting effect of a change of methylation level is mapped to an induced field in the Ising model. By returning the activity to the pre-stimulus level, this adapts the receptor cluster to a new ambient concentration of chemoeffector and ensures that a sensitive response can be maintained over a wide range of concentrations.
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"abstract": "Bacterial chemotaxis is controlled by the signalling of a cluster of\nreceptors. A cooperative model is presented, in which coupling between\nneighbouring receptor dimers enhances the sensitivity with which stimuli can be\ndetected, without diminishing the range of chemoeffector concentration over\nwhich chemotaxis can operate. Individual receptor dimers have two stable\nconformational states: one active, one inactive. Noise gives rise to a\ndistribution between these states, with the probability influenced by ligand\nbinding, and also by the conformational states of adjacent receptor dimers. The\ntwo-state model is solved, based on an equivalence with the Ising model in a\nrandomly distributed magnetic field. The model has only two effective\nparameters, and unifies a number of experimental findings. According to the\nvalue of the parameter comparing coupling and noise, the signal can be\narbitrarily sensitive to changes in the fraction of receptor dimers to which\nligand is bound. The counteracting effect of a change of methylation level is\nmapped to an induced field in the Ising model. By returning the activity to the\npre-stimulus level, this adapts the receptor cluster to a new ambient\nconcentration of chemoeffector and ensures that a sensitive response can be\nmaintained over a wide range of concentrations.",
"arxiv_id": "physics/9901052",
"authors": [
"Yu Shi",
"Thomas Duke"
],
"categories": [
"physics.bio-ph",
"cond-mat",
"q-bio.MN"
],
"doi": "10.1103/PhysRevE.58.6399",
"journal_ref": "Phys. Rev. E 58, 6399-6406 (1998)",
"title": "Cooperative Model of Bacterial Sensing",
"url": "https://arxiv.org/abs/physics/9901052"
},
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