Figure 6.
X-ray crystallographic binding modes of dipeptide amide 8 bound to rat nNOS (A; PDB 1P6H) and bovine eNOS (B; PDB 1P6L). Polar interactions are shown as dashed lines. Note the tighter electrostatic interaction between the α-amine of 8 and Glu592 (in A) from the negative charge of Asp597 (4.9 Å away).