Figure 2.
General structure of glutamate receptors. Metabotropic glutamate receptors belong to the family C G-protein-coupled receptors (GPCR). Group I mGluRs is coupled to phospholipase C, while groups II and III are negatively coupled to adenylate cyclase (AC). The iGluRs are ligand-gated cation channels that are divided into three groups: N-methyl-D-aspartate (NMDA), α-amino-3-hydroxy-5-methyl-4-isoxazole propionic acid (AMPA), and 2-carboxy-3-carboxymethyl-4-isopropenyl pyrrolidine (kainate, KA) receptors.