Structure of the Na1.4-β1 Complex from Electric Eel.

TitleStructure of the Na1.4-β1 Complex from Electric Eel.
Publication TypeJournal Article
Year of Publication2017
AuthorsYan, Z, Zhou, Q, Wang, L, Wu, J, Zhao, Y, Huang, G, Peng, W, Shen, H, Lei, J, Yan, N
JournalCell
Volume170
Issue3
Pagination470-482.e11
Date Published2017 Jul 27
ISSN1097-4172
KeywordsAmino Acid Sequence, Animals, Cryoelectron Microscopy, Electrophorus, Fish Proteins, Models, Molecular, Protein Domains, Sequence Alignment, Voltage-Gated Sodium Channels
Abstract

<p>Voltage-gated sodium (Na) channels initiate and propagate action potentials. Here, we present the cryo-EM structure of EeNa1.4, the Na channel from electric eel, in complex with the β1 subunit at 4.0 Å resolution. The immunoglobulin domain of β1 docks onto the extracellular L5 and L6 loops of EeNa1.4 via extensive polar interactions, and the single transmembrane helix interacts with the third voltage-sensing domain (VSD). The VSDs exhibit "up" conformations, while the intracellular gate of the pore domain is kept open by a digitonin-like molecule. Structural comparison with closed NaPaS shows that the outward transfer of gating charges is coupled to the iris-like pore domain dilation through intricate force transmissions involving multiple channel segments. The IFM fast inactivation motif on the III-IV linker is plugged into the corner enclosed by the outer S4-S5 and inner S6 segments in repeats III and IV, suggesting a potential allosteric blocking mechanism for fast inactivation.</p>

DOI10.1016/j.cell.2017.06.039
Alternate JournalCell
PubMed ID28735751