Figure 8. No water channels from the cytoplasm are found in cNOR.
The region similar to the K- and D-pathways in oxidases is shown (MD snapshot at ∼100 ns). In cNOR, residues in this region are mostly hydrophobic. The interior region remains minimally hydrated (as shown by the water density averaged over 300 ns), except for a small charged region below the active site with Glu211, Glu280, and Glu215.