Abstract
Quantum chemical model calculations were carried out for modeling the ion transport through an isolated ion channel of a cell membrane. An isolated part of a natural ion channel was modeled. The model channel was a calixarene derivative, hydrated sodium and potassium ions were the models of the transported ion. The electrostatic potential of the channel and the energy of the channel-ion system were calculated as a function of the alkali ion position. Both attractive and repulsive ion-channel interactions were found. The calculations – namely the dependence of the system energy and the atomic charges of the water molecules with respect to the position of the alkali ion in the channel – revealed the molecular-structural background of the potassium selectivity of this artificial ion channel. It was concluded that the studied ion channel mimics real biological ion channel quite well.
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Acknowledgments
The authors would like to express their gratitude for the help of Prof. Reiner Saltzer (Institute of Analytical Chemistry, Dresden University of Technology). I. M-Z participated in this work as a former staff member of IR and Raman Laboratory, Chemical Research Center of the Hungarian Academy of Sciences, Budapest.
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Billes, F., Mohammed-Ziegler, I. & Mikosch, H. Transportation behavior of alkali ions through a cell membrane ion channel. A quantum chemical description of a simplified isolated model. J Mol Model 18, 3627–3637 (2012). https://doi.org/10.1007/s00894-012-1364-9
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DOI: https://doi.org/10.1007/s00894-012-1364-9