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The recently resolved crystal structure of the neuropeptide Y Y1 receptor (Y1R), co-crystallized with the high-affinity (pK i: 10.11), argininamide-type Y1R antagonist UR-MK299 (2), revealed that the N ω-carbamoyl substituent (van der Waals volume: 139 Å3) is deeply buried in the receptor, occupying a hydrophobic pocket. We synthesized and characterized a series of argininamides, structurally related to 2. Y1R affinity decreased with increasing size of the carbamoyl residue (minimal pK i: 5.67). Exceeding a critical size of the substituent (van der Waals volume: 212 Å3), the ligands bound in an inverted mode with the carbamoyl side chain located at the surface of the receptor, as suggested by induced-fit docking and MD simulations.

rsc medicinal chemistry

Argininamide-type neuropeptide Y Y1 receptor antagonists: the nature of Nω-carbamoyl substituents determines Y1R binding mode and affinity