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Vistoli, Giulio; Pedretti, Alessandro; Dei, Silvia; Scapecchi, Serena; Marconi, Cristina; Romanelli, Maria Novella
Bioorganic & medicinal chemistry, 03/2008, Letnik: 16, Številka: 6Journal Article
The study presents a docking analysis for the interaction capabilities of some muscarinic receptors (i.e., M 1, M 2, and M 5) whose full-length models were previously generated by us. In detail, the docking simulations involved a dataset of 30 agonists, taken from the literature, including a first series of oxathiolane/dioxolane congeners and a second subset of more heterogeneous ligands. The obtained results unveil that it is possible to discriminate among the binding modes of considered muscarinic receptors, developing specific interaction patterns which are significantly different for the arrangement of both polar and hydrophobic interactions. Thus, the M 1 subtype possesses the widest binding site, while the M 2 receptor is characterized by a large but asymmetric region that accommodates the ligand’s ammonium head and finally the M 5 binding site is quite similar to that of M 2 subtype being univocally characterized by a second aspartate residue which interacts with the ammonium head. The significant correlations between docking scores and affinity values afford an encouraging validation for the reported binding modes and confirm the key role of molecular flexibility in the ligand recognition of muscarinic receptors.
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