G-protein coupled receptor for glutamate. Ligand binding causes a conformation change that triggers signaling via guanine nucleotide-binding proteins (G proteins) and modulates the activity of down-stream effectors, such as adenylate cyclase. Signaling inhibits adenylate cyclase activity. May mediate suppression of neurotransmission or may be involved in synaptogenesis or synaptic stabilization. Interacts with TAMALIN (By similarity). Interacts with HTR2A. Detected in brain cortex (at protein level). Widely expressed in different regions of the adult brain as well as in fetal brain. Belongs to the G-protein coupled receptor 3 family.