Figure 6.
Salt-bridge formation in the (A) R2D and (B) R3D model. Acidic and basic residues in the α-helical TM region (red, S1; yellow, S2; green, S3; blue, S4) are shown in licorice representation. The salt bridges present in >10% of the most populated cluster obtained with Rc = 0.1 nm and are highlighted in thick dotted lines.