Channelpedia

PubMed 21625456


Referenced in Channelpedia wiki pages of: none

Automatically associated channels: KCNQ1 , Kv7.1



Title: Continuum Molecular Simulation of Large Conformational Changes during Ion-Channel Gating.

Authors: Ali Nekouzadeh, Yoram Rudy

Journal, date & volume: PLoS ONE, 2011 , 6, e20186

PubMed link: http://www.ncbi.nlm.nih.gov/pubmed/21625456


Abstract
A modeling framework was developed to simulate large and gradual conformational changes within a macromolecule (protein) when its low amplitude high frequency vibrations are not concerned. Governing equations were derived as alternative to Langevin and Smoluchowski equations and used to simulate gating conformational changes of the Kv7.1 ion-channel over the time scale of its gating process (tens of milliseconds). The alternative equations predict the statistical properties of the motion trajectories with good accuracy and do not require the force field to be constant over the diffusion length, as assumed in Langevin equation. The open probability of the ion-channel was determined considering cooperativity of four subunits and solving their concerted transition to the open state analytically. The simulated open probabilities for a series of voltage clamp tests produced current traces that were similar to experimentally recorded currents.