dorsal/arxiv
View SchemaNon-Markovian Stochastic Resonance: three state model of ion channel gating
| Authors | I. Goychuk, P. Hanggi, J. L. Vega, S. Miret-Artes |
|---|---|
| Categories | |
| ArXiv ID | physics/0601070 |
| URL | https://arxiv.org/abs/physics/0601070 |
| DOI | 10.1103/PhysRevE.71.061906 |
| Journal | Phys. Rev. E 71, 061906 (2005) |
Abstract
Stochastic Resonance in single voltage-dependent ion channels is investigated within a three state non-Markovian modeling of the ion channel conformational dynamics. In contrast to a two-state description one assumes the presence of an additional closed state for the ion channel which mimics the manifold of voltage-independent closed subconformations (inactivated ``state''). The conformational transition into the open state occurs through a domain of voltage-dependent closed subconformations (closed ``state''). At distinct variance with a standard two-state or also three-state Markovian approach, the inactivated state is characterized by a broad, non-exponential probability distribution of corresponding residence times. The linear response to a periodic voltage signal is determined for arbitrary distributions of the channel's recovery times. Analytical results are obtained for the spectral amplification of the applied signal and the corresponding signal-to-noise ratio. Alternatively, these results are also derived by use of a corresponding two-state non-Markovian theory which is based on driven integral renewal equations [I. Goychuk and P. Hanggi, Phys. Rev. E 69, 021104 (2004)]. The non-Markovian features of stochastic resonance are studied for a power law distribution of the residence time-intervals in the inactivated state which exhibits a large variance. A comparison with the case of bi-exponentially distributed residence times possessing the same mean value, i.e. a simplest non-Markovian two-state description, is also presented.
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"abstract": "Stochastic Resonance in single voltage-dependent ion channels is investigated\nwithin a three state non-Markovian modeling of the ion channel conformational\ndynamics. In contrast to a two-state description one assumes the presence of an\nadditional closed state for the ion channel which mimics the manifold of\nvoltage-independent closed subconformations (inactivated ``state\u0027\u0027). The\nconformational transition into the open state occurs through a domain of\nvoltage-dependent closed subconformations (closed ``state\u0027\u0027). At distinct\nvariance with a standard two-state or also three-state Markovian approach, the\ninactivated state is characterized by a broad, non-exponential probability\ndistribution of corresponding residence times. The linear response to a\nperiodic voltage signal is determined for arbitrary distributions of the\nchannel\u0027s recovery times. Analytical results are obtained for the spectral\namplification of the applied signal and the corresponding signal-to-noise\nratio. Alternatively, these results are also derived by use of a corresponding\ntwo-state non-Markovian theory which is based on driven integral renewal\nequations [I. Goychuk and P. Hanggi, Phys. Rev. E 69, 021104 (2004)]. The\nnon-Markovian features of stochastic resonance are studied for a power law\ndistribution of the residence time-intervals in the inactivated state which\nexhibits a large variance. A comparison with the case of bi-exponentially\ndistributed residence times possessing the same mean value, i.e. a simplest\nnon-Markovian two-state description, is also presented.",
"arxiv_id": "physics/0601070",
"authors": [
"I. Goychuk",
"P. Hanggi",
"J. L. Vega",
"S. Miret-Artes"
],
"categories": [
"physics.bio-ph"
],
"doi": "10.1103/PhysRevE.71.061906",
"journal_ref": "Phys. Rev. E 71, 061906 (2005)",
"title": "Non-Markovian Stochastic Resonance: three state model of ion channel gating",
"url": "https://arxiv.org/abs/physics/0601070"
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