Adenosine receptors (version 2019.4) in the IUPHAR/BPS Guide to Pharmacology Database
Adenosine receptors (nomenclature as agreed by the NC-IUPHAR Subcommittee on Adenosine Receptors ) are activated by the endogenous ligand adenosine (potentially inosine also at A3 receptors). Crystal structures for the antagonist-bound [146, 305, 213, 55], agonist-bound [362, 196, 198] and G protein-bound A2A adenosine receptors  have been described. The structures of an antagonist-bound A1 receptor  and an adenosine-bound A1 receptor-Gi complex  have been resolved by cryo-electronmicroscopy. Another structure of an antagonist-bound A1 receptor obtained with X-ray crystallography has also been reported .
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