This is a receptor for the tachykinin neuropeptide substance P. It is probably associated with G proteins that activate a phosphatidylinositol-calcium second messenger system. The rank order of affinity of this receptor to tachykinins is: substance P > substance K > neuromedin-K.
[1] "Molecular cloning, structural characterization and functional expression of the human substance P receptor."Takeda Y., Chou K.B., Takeda J., Sachais B.S., Krause J.E.Biochem. Biophys. Res. Commun. 179:1232-1240(1991) [2] "Isolation and characteris