1.A.1.14.6
Bacterial voltage-gated sodium channel, Nav.  3-d crystal structures of vaious conformations are known (4P_3A A-D; 4PA7_A-D; 4P9P_A-D. etc.)  (McCusker et al. 2012).  It has its internal cavity accessible to the cytoplasmic surface as a result of a bend/rotation about a central residue in the carboxy-terminal TMS that opens the gate to allow entry of hydrated sodium ions. The molecular dynamics of ion transport through the open conformation has been analyzed (Ulmschneider et al. 2013).  The C-terminal four helix coiled coil bundle domain couples inactivation with channel opining, depedent on the negatively charged linker region (Bagnéris et al. 2013).