FIGURE 4.

Water densities in wild-type and L109S gain-of-function MscS pores. The probability of the occurrence of water oxygens was calculated using a three-dimensional volumetric grid and normalized to the density of bulk water outside the pore. The maps represent 2 Å slices along the pore axis, averaged for the last 5.5 ns of WT MscS simulation with (a) and without (b) salt, and for 3.5 ns of L109S (c) in the presence of salt. Inset in a shows the density in the slice across the wider nonpolar region where water is organized as two concentric cylindrical layers.