Design of a True Bivalent Ligand with Picomolar Binding Affinity for a G Protein-Coupled Receptor Homodimer

Daniel Pulido, Verònica Casadó-Anguera, Laura Pérez-Benito, Estefanía Moreno, Arnau Cordomí, Laura López, Antoni Cortés, Sergi Ferré, Leonardo Pardo, Vicent Casadó, Miriam Royo

Research output: Contribution to journalArticleResearch

17 Citations (Scopus)

Abstract

Copyright © 2018 American Chemical Society. Bivalent ligands have emerged as chemical tools to study G protein-coupled receptor dimers. Using a combination of computational, chemical, and biochemical tools, here we describe the design of bivalent ligand 13 with high affinity (KDB1 = 21 pM) for the dopamine D2 receptor (D2R) homodimer. Bivalent ligand 13 enhances the binding affinity relative to monovalent compound 15 by 37-fold, indicating simultaneous binding at both protomers. Using synthetic peptides with amino acid sequences of transmembrane (TM) domains of D2R, we provide evidence that TM6 forms the interface of the homodimer. Notably, the disturber peptide TAT-TM6 decreased the binding of bivalent ligand 13 by 52-fold and had no effect on monovalent compound 15, confirming the D2R homodimer through TM6 ex vivo. In conclusion, by using a versatile multivalent chemical platform, we have developed a precise strategy to generate a true bivalent ligand that simultaneously targets both orthosteric sites of the D2R homodimer.
Original languageEnglish
Pages (from-to)9335-9346
JournalJournal of Medicinal Chemistry
Volume61
DOIs
Publication statusPublished - 25 Oct 2018

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