Ions in Action! Studying ion channels by Computational Electrophysiology¶
This module allows the detailed investigation of membrane-embedded ion channels (sketched in yellow and magenta in the figure) in GROMACS. By employing an ion/water exchange protocol in a double-membrane simulation setup, combined with an ion concentration and/or charge imbalance across the membrane, a steady state with a continuous flow of ions through the channels is achieved. For each channel the anionic and cationic permeation events are recorded in the output file as a function of time. The permeation events reveal conductance, selectivity, and rectification behaviour, which allow a straightforward comparison to experiment. In addition, the ionic pathways through the channels are uncovered.