Optimization of Adenosine 5′-Carboxamide Derivatives as Adenosine Receptor Agonists Using Structure-Based Ligand Design and Fragment Screening
- Dilip K. Tosh
- ,
- Khai Phan
- ,
- Zhan-Guo Gao
- ,
- Andrei A. Gakh
- ,
- Fei Xu
- ,
- Francesca Deflorian
- ,
- Ruben Abagyan
- ,
- Raymond C. Stevens
- ,
- Kenneth A. Jacobson
- , and
- Vsevolod Katritch
Abstract

Structures of G protein-coupled receptors (GPCRs) have a proven utility in the discovery of new antagonists and inverse agonists modulating signaling of this important family of clinical targets. Applicability of active-state GPCR structures to virtual screening and rational optimization of agonists, however, remains to be assessed. In this study of adenosine 5′ derivatives, we evaluated the performance of an agonist-bound A2A adenosine receptor (AR) structure in retrieval of known agonists and then employed the structure to screen for new fragments optimally fitting the corresponding subpocket. Biochemical and functional assays demonstrate high affinity of new derivatives that include polar heterocycles. The binding models also explain modest selectivity gain for some substituents toward the closely related A1AR subtype and the modified agonist efficacy of some of these ligands. The study suggests further applicability of in silico fragment screening to rational lead optimization in GPCRs.
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