Structural basis of human Na v 1.5 gating mechanisms.

Voltage-gated Na v 1.5 channels are central to the generation and propagation of cardiac action potentials 1 . Aberrations in their function are associated with a wide spectrum of cardiac diseases including arrhythmias and heart failure 2-5 . Despite decades of progress in Na v 1.5 biology 6-8 , the lack of structural insights into intracellular regions has hampered our understanding of its gating mechanisms. Here we present three cryo-EM structures of human Na v 1.5 in previously unanticipated open states, revealing sequential conformational changes in gating charges of the voltage-sensing domains (VSDs) and several intracellular regions. Despite the channel being in the open state, these structures show the IFM motif repositioned in the receptor site but not dislodged. In particular, our structural findings highlight a dynamic C-terminal domain (CTD) and III-IV linker interaction, which regulates the conformation of VSDs and pore opening. Electrophysiological studies confirm that disrupting this interaction results in the fast inactivation of Na v 1.5. Together, our structure-function studies establish a foundation for understanding the gating mechanisms of Na v 1.5 and the mechanisms underlying CTD-related channelopathies.