A molecular theory for nonohmicity of the ion leak across the lipid- bilayer membrane

Youhei Fujitani, Dick Bedeaux

研究成果: Article査読

1 被引用数 (Scopus)

抄録

The current-voltage relationship of ion leak (i.e., ion transport involving neither special channels nor carriers) across the lipid-bilayer membrane has been observed to be log-linear above the ohmic regime. The coefficient of the linear term has been found to be universal for membranes and penetrants examined. This universality has been explained in terms of diffusion in an external field, where the ion position is described as a Markovian process. Such a diffusion picture can be questioned, however. It is also probable that a leaking ion gets over the potential barrier before experiencing sufficient random collision in the membrane, considering that each ion is surrounded with long lipid molecules aligned almost unidirectional y. As an alternative, we discuss this ion leak in terms of velocity distribution of the ions entering the membrane and density fluctuation of the lipids. We conclude that we can explain the universality without resorting to the diffusion picture.

本文言語English
ページ(範囲)1805-1814
ページ数10
ジャーナルBiophysical Journal
73
4
DOI
出版ステータスPublished - 1997 10

ASJC Scopus subject areas

  • 生物理学

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