Combining with epinephrine or norepinephrine to initiate a change in cell activity via activation of a G protein, with pharmacological characteristics of alpha2-adrenergic receptors; the activity involves transmitting the signal to the Gi alpha subunit of a heterotrimeric G protein.
Synonyms:
exact_synonym:
alpha2 adrenoceptor
xref:
Reactome:R-HSA-400071 "Alpha-2A,alpha-2C Adrenergic Receptors bind adrenaline or noradrenaline"