This is one of the several different receptors for 5-hydroxytryptamine (serotonin), a biogenic hormone that function as a neurotransmitter, a hormone, and a mitogen. The activity of this receptor is mediated by G proteins that stimulate adenylate cyclase. It has a high affinity for tricyclic psychotropic drugs (By similarity). Controls pyramidal neurons migration during corticogenesis, through the regulation of CDK5 activity (PubMed:25078650). Is an activator of TOR signaling (PubMed:23027611). Interacts with CDK5 (PubMed:25078650). Interacts with MTOR (PubMed:23027611). Interacts with RPTOR and NF1 (By similarity). Belongs to the G-protein coupled receptor 1 family.