Structural insights into ligand recognition, activation, and signaling of the α2A adrenergic receptor.
Sci Adv
; 8(9): eabj5347, 2022 03 04.
Article
en En
| MEDLINE
| ID: mdl-35245122
ABSTRACT
The α2A adrenergic receptor (α2AAR) is a G protein (heterotrimeric guanine nucleotide-binding protein)-coupled receptor that mediates important physiological functions in response to the endogenous neurotransmitters norepinephrine and epinephrine, as well as numerous chemically distinct drugs. However, the molecular mechanisms of drug actions remain poorly understood. Here, we report the cryo-electron microscopy structures of the human α2AAR-GoA complex bound to norepinephrine and three imidazoline derivatives (brimonidine, dexmedetomidine, and oxymetazoline). Together with mutagenesis and functional data, these structures provide important insights into the molecular basis of ligand recognition, activation, and signaling at the α2AAR. Further structural analyses uncover different molecular determinants between α2AAR and ßARs for recognition of norepinephrine and key regions that determine the G protein coupling selectivity. Overall, our studies provide a framework for understanding the signal transduction of the adrenergic system at the atomic level, which will facilitate rational structure-based discovery of safer and more effective medications for α2AAR.
Texto completo:
1
Banco de datos:
MEDLINE
Asunto principal:
Transducción de Señal
/
Proteínas de Unión al GTP
Límite:
Humans
Idioma:
En
Revista:
Sci Adv
Año:
2022
Tipo del documento:
Article
País de afiliación:
China