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A Multi-Scale Approach to Model K+ Permeation Through the KcsA Channel.

T L Horng1, R S Chen2, M V Leonardi3

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|August 1, 2022
PubMed
Summary
This summary is machine-generated.

Potassium (K+) channels efficiently transport ions. New simulations reveal K+ ions occupy specific sites within the KcsA channel

Keywords:
Bikerman–Poisson–BoltzmannIV curveK channelsKcsAkinetic modelmolecular dynamicspermeation

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Area of Science:

  • Biophysics
  • Molecular Biology
  • Ion Channel Function

Background:

  • Potassium (K+) channels are vital for cellular function, enabling efficient K+ ion passage while excluding Na+ ions.
  • The KcsA K+ channel structure, known for over 20 years, provides molecular insights into K+ permeation and selectivity.
  • Recent studies suggest the K+ channel selectivity filter (SF) lacks water and can hold four adjacent K+ ions.

Purpose of the Study:

  • To investigate the mechanism of K+ permeation through KcsA channels using a multi-scale approach.
  • To determine stable ion configurations within the KcsA SF under physiological conditions.
  • To develop a kinetic permeation model based on simulated ion configurations and experimental data.

Main Methods:

  • Molecular dynamics (MD) simulations to identify stable K+ ion configurations in the KcsA SF.
  • Continuum Bikerman-Poisson-Boltzmann modeling to validate MD findings, considering ion volume and dehydration.
  • Kinetic permeation modeling using rate constants from molecular meta-dynamics simulations.

Main Results:

  • MD simulations revealed K+ ions primarily occupy central SF sites (S2, S3) and channel entrances, with external and internal sites also occupied.
  • S1 and S4 sites within the KcsA SF were consistently found to be unoccupied by K+ ions.
  • The Bikerman-Poisson-Boltzmann model corroborated MD results, showing distinct K+ occupancy peaks at S2, S3, and entrances.
  • A kinetic permeation model accurately reproduced experimental KcsA channel properties, including current-voltage and conductance-concentration relationships.

Conclusions:

  • The identified equilibrium ion configuration in the KcsA SF is crucial for K+ permeation.
  • The multi-scale approach successfully modeled K+ channel function, aligning simulation results with experimental observations.
  • This study enhances understanding of the molecular mechanisms governing K+ ion selectivity and transport through ion channels.