ArticlePloS one2015
Mechanism of Ion Permeation in Mammalian Voltage-Gated Sodium Channels.
Article in PloS one, 2015. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 11 papers.
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Who cites it
11 citing papers in PubMed.
- Subunit-specific conductance of single homomeric and heteromeric HCN pacemaker channels at femtosiemens resolution.Proceedings of the National Academy of Sciences of the United States of America · 2025Article
- Molecular Dynamics Simulations of Ion Permeation in Human Voltage-Gated Sodium Channels.Journal of chemical theory and computation · 2023Article
- Neuromorphic van der Waals crystals for substantial energy generation.Nature communications · 2021Article
- Comparison of permeation mechanisms in sodium-selective ion channels.Neuroscience letters · 2019Review
- Challenges and advances in atomistic simulations of potassium and sodium ion channel gating and permeation.The Journal of physiology · 2019Review
- Selective ion permeation involves complexation with carboxylates and lysine in a model human sodium channel.PLoS computational biology · 2018Article
- Simulating the ion permeation and ion selection for a eukaryotic voltage-gated sodium channel NaProtein & cell · 2018Article
- Node of Ranvier as an Array of Bio-Nanoantennas for Infrared Communication in Nerve Tissue.Scientific reports · 2018Article
- Guanidinium Toxins and Their Interactions with Voltage-Gated Sodium Ion Channels.Marine drugs · 2017Review
- Modeling the human NaDrug design, development and therapy · 2017Article
- Article
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Authors and funding
2 authors.
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Abstract
Recent determination of the crystal structures of bacterial voltage-gated sodium (NaV) channels have raised hopes that modeling of the mammalian counterparts could soon be achieved. However, there are substantial differences between the pore domains of the bacterial and mammalian NaV channels, which necessitates careful validation of mammalian homology models constructed from the bacterial NaV structures. Such a validated homology model for the NaV1.4 channel was constructed recently using the extensive mutagenesis data available for binding of μ-conotoxins. Here we use this NaV1.4 model to study the ion permeation mechanism in mammalian NaV channels. Linking of the DEKA residues in the selectivity filter with residues in the neighboring domains is found to be important for keeping the permeation pathway open. Molecular dynamics simulations and potential of mean force calculations reveal that there is a binding site for a Na+ ion just inside the DEKA locus, and 1-2 Na+ ions can occupy the vestibule near the EEDD ring. These sites are separated by a low free energy barrier, suggesting that inward conduction occurs when a Na+ ion in the vestibule goes over the free energy barrier and pushes the Na+ ion in the filter to the intracellular cavity, consistent with the classical knock-on mechanism. The NaV1.4 model also provides a good description of the observed Na+/K+ selectivity.
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