Why is gramicidin valence selective? A theoretical study

Shen-shu Sung, P. C. Jordan

Research output: Contribution to journalArticle

31 Citations (Scopus)

Abstract

Calculations contrasting the channel solvation energy for cesium ions and chloride ions associated with water in gramicidin-like channels are presented. The energy profile for the cation exhibits a deep well at the channel entrance; within the single file region the solvation energy is roughly constant. The anion exhibits a totally different energy profile. There is an energy barrier at the channel entrance; if the ion could surmount this barrier, it would be quite stable within the channel. At the channel entrance, the calculated solvation energy difference between anion and cation is approximately 15 kcal mol-1. This is completely consistent with the observation that chloride neither permeates nor blocks the channel since the estimated rate of ion entry would be approximately 0.01–10(-5) s-1, far slower than the rate at which the channel dimer dissociates into monomers.

Original languageEnglish (US)
Pages (from-to)661-672
Number of pages12
JournalBiophysical journal
Volume51
Issue number4
DOIs
StatePublished - Jan 1 1987

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Gramicidin
Theoretical Models
Ions
Anions
Cations
Chlorides
Water

All Science Journal Classification (ASJC) codes

  • Biophysics

Cite this

Sung, Shen-shu ; Jordan, P. C. / Why is gramicidin valence selective? A theoretical study. In: Biophysical journal. 1987 ; Vol. 51, No. 4. pp. 661-672.
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Why is gramicidin valence selective? A theoretical study. / Sung, Shen-shu; Jordan, P. C.

In: Biophysical journal, Vol. 51, No. 4, 01.01.1987, p. 661-672.

Research output: Contribution to journalArticle

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