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Origin of ion selectivity in Phaseolus coccineus mitochondrial VDAC.

par Krammer, Eva-Maria ;Saidani, Hayet;Prévost, Martine ;Homblé, Fabrice
Référence Mitochondrion
Publication Publié, 2014

Article révisé par les pairs

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Résumé :

The mitochondrial voltage-dependent anion-selective channel (VDAC) is the major permeation pathway for small ions and metabolites. Although a wealth of electrophysiological data has been obtained on different VDAC species, the physical mechanisms of their ionic selectivity are still elusive. We addressed this issue using electrophysiological experiments performed on plant VDAC. A simple macroscopic electrodiffusion model accounting for ion diffusion and for an effective fixed charge of the channel describes well its selectivity. Brownian Dynamics simulations of ion permeation performed on plant and mammalian VDACs point to the role of specific charged residues located at about the middle of the pore.