Figure 6.
SASA for TM6-IL3-TM7 in the occluded and inward-facing conformations of DAT. SASA values were calculated for each position after residues were mutated to cysteines, one at a time, and then minimized and equilibrated in a water/lipid environment. In the SASA analysis, only surface area accessible to solvents was counted; surface area exposed to lipids was treated as buried. The SASA percentage was obtained as described in Methods. The 8.5 % threshold chosen to define accessibility is indicated with a stippled line.