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J Med Chem. 2017 Oct 26;60(20):8425-8440. doi: 10.1021/acs.jmedchem.7b00854. Epub 2017 Oct 10.

Molecular Recognition of Agonists and Antagonists by the Nucleotide-Activated G Protein-Coupled P2Y2 Receptor.

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PharmaCenter Bonn, Pharmaceutical Institute, Pharmaceutical Sciences Bonn (PSB), Pharmaceutical Chemistry I, University of Bonn , 53121 Bonn, Germany.
Department of Chemistry, Faculty of Science, Sultan Qaboos University , PO Box 36, Postal Code 123, Muscat, Oman.
PharmaCenter Bonn, Pharmaceutical Institute, Pharmaceutical Chemistry II, University of Bonn , 53121 Bonn, Germany.


A homology model of the nucleotide-activated P2Y2R was created based on the X-ray structures of the P2Y1 receptor. Docking studies were performed, and receptor mutants were created to probe the identified binding interactions. Mutation of residues predicted to interact with the ribose (Arg110) and the phosphates of the nucleotide agonists (Arg265, Arg292) or that contribute indirectly to binding (Tyr288) abolished activity. The Y114F, R194A, and F261A mutations led to inactivity of diadenosine tetraphosphate and to a reduced response of UTP. Significant reduction in agonist potency was observed for all other receptor mutants (Phe111, His184, Ser193, Phe261, Tyr268, Tyr269) predicted to be involved in agonist recognition. An ionic lock between Asp185 and Arg292 that is probably involved in receptor activation interacts with the phosphate groups. The antagonist AR-C118925 and anthraquinones likely bind to the orthosteric site. The updated homology models will be useful for virtual screening and drug design.

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