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Biophys J. 2012 Apr 18;102(8):1815-25. doi: 10.1016/j.bpj.2012.03.032.

A theoretical model for calculating voltage sensitivity of ion channels and the application on Kv1.2 potassium channel.

Author information

  • 1Drug Discovery and Design Center, State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, Shanghai, China.

Abstract

Voltage sensing confers conversion of a change in membrane potential to signaling activities underlying the physiological processes. For an ion channel, voltage sensitivity is usually experimentally measured by fitting electrophysiological data to Boltzmann distributions. In our study, a two-state model of the ion channel and equilibrium statistical mechanics principle were used to test the hypothesis of empirically calculating the overall voltage sensitivity of an ion channel on the basis of its closed and open conformations, and determine the contribution of individual residues to the voltage sensing. We examined the theoretical paradigm by performing experimental measurements with Kv1.2 channel and a series of mutants. The correlation between the calculated values and the experimental values is at respective level, R(2) = 0.73. Our report therefore provides in silico prediction of key conformations and has identified additional residues critical for voltage sensing.

Copyright © 2012 Biophysical Society. Published by Elsevier Inc. All rights reserved.

PMID:
22768937
[PubMed - indexed for MEDLINE]
PMCID:
PMC3328696
Free PMC Article

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