Figure 4. Interaction vs. ligand binding affinity at S1P4.
S1P4 complex with FTY720P (A), phosphonate (B) and SEW2871 (C). Ball and stick atoms represent ligands and stick atoms represent residues required for ligand binding. Non-polar hydrogens are omitted for clarity. S1P4 interactions with ligands in order FTY720P (A) > S1P ~ benzimidazole > Phosphonate (B) > Azetidine > SEW2871 (C) agree with binding affinity observed for these ligands (Table 1).