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Biophysical Journal 45: 1101-1107 (1984)
© 1984 the Biophysical Society

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Effect of pore structure on energy barriers and applied voltage profiles. II. Unsymmetrical channels.

P C Jordan

ABSTRACT

This paper examines "realistic" pores, i.e., ones that are neither symmetric nor of uniform diameter. Methods are described that permit estimation of the image potential for an ion in an aqueous pore spanning a lipid membrane and for the electric field produced in such a pore when a transmembrane potential is applied. They are used to model features of the delayed rectifier potassium channel. Constraints on the geometry of the exterior mouth, the dielectric properties of the narrow part of the pore and the conduction mechanism are determined for this channel.






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Copyright © 1984 by the Biophysical Society.