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Assuming that the selectivity filter of KcsA potassium ion channel mayexhibit quantum coherence, we extend a previous model by Vaziri and Plenio(2010) to take into account Coulomb repulsion between potassium ions. We showthat typical ion transit timescales are determined by this interaction, whichimposes optimal input/output parameter ranges. Also, as observed in otherexamples of quantum tunneling in biological systems, addition of moderate noisehelps coherent ion transport.

Coulomb interaction rules timescales in potassium ion channel tunneling