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We consider ion transport through protein ion channels in lipid membranes andwater-filled nanopores in silicon films. It is known that, due to the largeratio of dielectric constants of water and the surrounding material, an ionplaced inside the channel faces a large electrostatic self-energy barrier. Thebarrier leads to an exponentially large resistance of the channel. We studyreduction of the electrostatic barrier by immobile charges located on theinternal walls of the channel. We show that the barrier practically vanishesalready at relatively small concentration of wall charges.Comment: 4 pages, 5 figures, typos eliminated, references adde

Conductance of Ion Channels and Nanopores with Charged Walls: A Toy Model