HCRTR1

G protein-coupled receptor that binds the neuropeptide orexin-A with high affinity, and orexin-B with lower affinity, two peptides derived from a common precursor, prepro-orexin. Its activity is mediated via a G(q)-protein-coupled pathway, which activates the phosphatidylinositol-calcium second messenger system in response to orexin-A binding. In addition to G(q)-mediated signaling, orexin-A stimulation also promotes beta-arrestin recruitment, leading to receptor internalization. Plays a significant role in the regulation of food intake (By similarity)..

Function from UniProtKB (O43613), read 2026-09-23. CC BY 4.0.