Mechanisms of valence selectivity in biological ion channels

B. Corry*, S. H. Chung

*Corresponding author for this work

    Research output: Contribution to journalReview articlepeer-review

    70 Citations (Scopus)

    Abstract

    Transmembrane ion channels play a crucial role in the existence of all living organisms. They partition the exterior from the interior of the cell, maintain the proper ionic gradient across the cell membrane and facilitate signaling between cells. To perform these functions, ion channels must be highly selective, allowing some types of ions to pass while blocking the passage of others. Here we review a number of studies that have helped to elucidate the mechanisms by which ion channels discriminate between ions of differing charge, focusing on four channel families as examples: gramicidin, ClC chloride, voltage-gated calcium and potassium channels. The recent availability of high-resolution structural data has meant that the specific inter-atomic interactions responsible for valence selectivity can be pinpointed. Not surprisingly, electrostatic considerations have been shown to play an important role in ion specificity, although many details of the origins of this discrimination remain to be determined.

    Original languageEnglish
    Pages (from-to)301-315
    Number of pages15
    JournalCellular and Molecular Life Sciences
    Volume63
    Issue number3
    DOIs
    Publication statusPublished - Feb 2006

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