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arXiv · 1005.0278

Ionic correlations at the nanoscale: inversion of selectivity in a bio-nanochannel

Marcel Aguilella-Arzo·Carles Calero·Jordi Faraudo
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Abstract

Here we show, combining a simulation and theoretical study, that electrostatic correlations typical of multivalent ions can reverse the selectivity of a biological nanochannel. Our results provide a physical mechanism for a new, experimentally observed phenomenon, namely the inversion of the selectivity of a bacterial porin (the E. Coli OmpF) in presence of divalent and trivalent cations. Also, the differences and similarities between the driving force for this phenomenon and other similar nano and micro-escale electrokinetic effects (e.g. inversion of streaming current in silica nanochannels) are explored.

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Marcel Aguilella-Arzo, Carles Calero, Jordi Faraudo. 2010-05-03. Ionic correlations at the nanoscale: inversion of selectivity in a bio-nanochannel. https://doi.org/10.1039/c0sm00904k

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