title: Structural Insights into 5-HT1A/D4 Selectivity of WAY-100635 Analogues: Molecular Modeling, Synthesis, and in Vitro Binding.
abstract: The resurgence of interest in 5-HT1A receptors as a therapeutic target requires the existence of highly selective 5-HT1A ligands. To date, WAY-100635 has been the prototypical antagonist of these receptors. However, this compound also has significant affinity for and activity at D4 dopamine receptors. In this context, this work was aimed at better understanding the 5-HT1A/D4 selectivity of WAY-100635 and analogues from a structural point of view. In silico investigations revealed two key interactions for the 5-HT1A/D4 selectivity of WAY-100635 and analogues. First, a hydrogen bond only found with the Ser 7.36 of D4 receptor appeared to be the key for a higher D4 affinity for newly synthesized aza analogues. The role of Ser 7.36 was confirmed as the affinity of aza analogues for the mutant D4 receptor S7.36A was reduced. Then, the formation of another hydrogen bond with the conserved Ser 5.42 residue appeared to be also critical for D4 binding.
authors.affiliation: Laboratory of Medicinal Chemistry and C.I.R.M. and ‡Laboratory of Pharmacology and GIGA-Neuroscience, University of Liège , avenue Hippocrate, 15 (B36), B-4000 Liège 1, Belgium.
authors.forename: Sébastien
authors.initials: S
authors.lastname: Dilly
authors.affiliation: Laboratory of Medicinal Chemistry and C.I.R.M. and ‡Laboratory of Pharmacology and GIGA-Neuroscience, University of Liège , avenue Hippocrate, 15 (B36), B-4000 Liège 1, Belgium.
authors.forename: Jean-François
authors.initials: JF
authors.lastname: Liégeois
mesh_terms: D000818:Animals; D060326:Chemistry Techniques, Synthetic; D006801:Humans; D008024:Ligands; D008958:Models, Molecular; D062105:Molecular Docking Simulation; D009154:Mutation; D010879:Piperazines / Q000138:chemical synthesis* / Q000737:chemistry / Q000378:metabolism*; D011485:Protein Binding; D011487:Protein Conformation; D011725:Pyridines / Q000138:chemical synthesis* / Q000737:chemistry / Q000378:metabolism*; D044282:Receptor, Serotonin, 5-HT1A / Q000737:chemistry* / Q000378:metabolism*; D050638:Receptors, Dopamine D4 / Q000737:chemistry* / Q000235:genetics / Q000378:metabolism*; D061987:Sf9 Cells; D018411:Spodoptera; D013379:Substrate Specificity
chemical_list: D008024:Ligands; D010879:Piperazines; D011725:Pyridines; D044282:Receptor, Serotonin, 5-HT1A; D050638:Receptors, Dopamine D4; C090413:N-(2-(4-(2-methoxyphenyl)-1-piperazinyl)ethyl)-N-(2-pyridinyl)cyclohexanecarboxamide