Structure of an Agonist-Bound Human A2A Adenosine Receptor
Abstract
Activation of G protein-coupled receptors upon agonist binding is a critical step in the signaling cascade for this family of cell surface proteins. We report the crystal structure of the A2A adenosine receptor (A2AAR) bound to an agonist UK-432097 at 2.7 angstrom resolution. Relative to inactive, antagonist-bound A2AAR, the agonist-bound structure displays an outward tilt and rotation of the cytoplasmic half of helix VI, a movement of helix V, and an axial shift of helix III, resembling the changes associated with the active-state opsin structure. Additionally, a seesaw movement of helix VII and a shift of extracellular loop 3 are likely specific to A2AAR and its ligand. The results define the molecule UK-432097 as a “conformationally selective agonist” capable of receptor stabilization in a specific active-state configuration.
- Publication:
-
Science
- Pub Date:
- April 2011
- DOI:
- 10.1126/science.1202793
- Bibcode:
- 2011Sci...332..322X
- Keywords:
-
- BIOCHEM