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. Signaling inhibits adenylate cyclase activity. Interacts with TAMALIN. Detected in brain cortex, thalamus, subthalamic nucleus, substantia nigra, hypothalamus, hippocampus, corpus callosum, caudate nucleus and amygdala. Appears to be membrane-associated, despite the absence of the seven-transmembrane domain. Belongs to the G-protein coupled receptor 3 family. Truncated N-terminus. Extended N-terminus. Truncated N-terminus.