Abstract
K+ ions move rapidly through potassium channels more or less ignoring Na+. The mechanism of selectivity is thought to depend on the solvation of K+ and its electrostatic interactions with carbonyl dipoles of the channel wall, made of the side chains Thr Val Gly Tyr Gly TVGYG in many types of potassium channels. We calculate the conductance of the tetrameric KcsA prokaryotic K+ channel measured in solutions of different K+ concentration. The 3D model used here consists of two regions of different dielectric constant, one representing the protein and one representing a bath of implicit water.
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