Background: The eukaryotic voltage-gated sodium channel(e-Nav) is a large asymmetric
transmembrane protein with important functions concerning neurological function. No structure has
been resolved at high resolution for this protein.
Methods: A homology model of the transmembrane and extracellular regions of an Anopheles
gambiae para-like channel with emphasis on the pore entrance has been constructed, based upon the
templates provided by a prokaryotic sodium channel and a potassium two-pore channel. The latter
provides a template for the extracellular regions, which are located above the entrance to the pore,
which is likely to open at a side of a dome formed by these loops.
Results: A model created with this arrangement shows a structure similar to low-resolution cryoelectron
microscope images of a related structure. The pore entrance also shows favorable
Conclusion: Residues responsible for the negative charge around the pore have been traced in
phylogeny to highlight their importance. This model is intended for the study of pore-blocking toxins.