Ionic Coulomb blockade and the determinants of selectivity in the NaChBac bacterial sodium channel.
Mutation-induced transformations of conductivity and selectivity in NaChBac bacterial channels are studied experimentally and interpreted within the framework of ionic Coulomb blockade (ICB), while also taking account of resonant quantised dehydration (QD) and site protonation. Site-directed mutagenesis and whole-cell patch-clamp experiments are used to investigate how the fixed charge Qf at the selectivity filter (SF) affects both valence selectivity and same-charge selectivity. The new ICB/QD model predicts that increasing ∣Qf∣ should lead to a shift in selectivity sequences toward larger ion sizes, in agreement with the present experiments and with earlier work. Comparison of the model with experimental data leads to the introduction of an effective charge Qf∗ at the SF, which was found to differ between Aspartate and Glutamate charged rings, and also to depend on position within the SF. It is suggested that protonation of the residues within the restricted space of the SF is important in significantly reducing the effective charge of the EEEE ring. Values of Qf∗ derived from experiments on divalent blockade agree well with expectations based on the ICB/QD model and have led to the first demonstration of ICB oscillations in Ca2+ conduction as a function of the fixed charge. Preliminary studies of the dependence of Ca2+ conduction on pH are qualitatively consistent with the predictions of the model.
['Fedorenko|O A|OA|', 'Kaufman|I Kh|IK|', 'Gibby|W A T|WAT|', 'Barabash|M L|ML|', 'Luchinsky|D G|DG|', 'Roberts|S K|SK|', 'McClintock|P V E|PVE|']
D000595:Amino Acid Sequence D001224:Aspartic Acid D002118:Calcium D018698:Glutamic Acid D052578:Ionic Liquids D007477:Ions D016297:Mutagenesis, Site-Directed D018408:Patch-Clamp Techniques D015222:Sodium Channels
Ionic coulomb blockade Ion channel selectivity Voltage-gated sodium and calcium channels Whole-cell patch clamp