Modeling hysteresis observed in the human erythrocyte voltage-dependent cation channel

Henrik Flyvbjerg, Ewa Gudowska-Nowak, Palle Christophersen, Poul Bennekou

    Research output: Contribution to journalJournal articleResearchpeer-review


    The non-selective voltage-activated cation channel from human red cells, which is activated at depolarizing potentials, has been shown to exhibit counter-clockwise gating hysteresis. Here, we analyze this phenomenon with the simplest possible phenomenological models. Specifically, the hysteresis cycle, including its direction, is reproduced by a model with 2×2 discrete states: the normal open/closed states and two different states of "gate tension". Rates of transitions between the two branches of the hysteresis curve are modeled with single-barrier kinetics by introducing a real-valued "reaction coordinate" parametrizing the protein's conformational change between the two states of gate tension. The resulting scenario suggests a reanalysis of former experiments with NSVDC channels.
    Original languageEnglish
    JournalActa Physica Polonica B
    Issue number11
    Pages (from-to)2117-2140
    Publication statusPublished - 2012

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