Glutamate receptor ionotropic, delta-2 (GRID2) (GRID2)

Glutamate receptor ionotropic, delta-2 (GRID2), also known as GluD2, is a member of the ionotropic glutamate receptor family predominantly expressed in the Purkinje cells of the cerebellum (Hirbec et al., 2002, European Journal of Pharmacology). Unlike typical ionotropic glutamate receptors, GRID2 does not function as a traditional glutamate-gated ion channel but plays a crucial role in synapse formation, maintenance, and long-term depression (LTD) at the parallel fiber-Purkinje cell synapse (Yuzaki, 2003, Neuroscience Research). Gacyclidine (GK-11), originally developed as a non-competitive NMDA receptor antagonist for neuroprotection, was found to possess a high-affinity "non-NMDA" binding site specifically on the dendritic trees of Purkinje cells, which was later identified as GRID2 (Hirbec et al., 2005, Journal of Neurochemistry). This interaction is significant because GRID2 is involved in motor coordination and its dysfunction is linked to various forms of cerebellar ataxia (UniProt, O43424). Research into gacyclidine's binding at this site has provided insights into the structural biology of the delta receptor family and its potential as a therapeutic target for cerebellar disorders. The receptor acts as a bridge between the presynaptic and postsynaptic membranes, interacting with proteins like Cbln1 and Neurexin to stabilize synapses. Consequently, drugs targeting this site may influence cerebellar circuit integrity and motor learning.

Other names

GluD2GluR delta-2Ionotropic glutamate receptor delta-2 subunitGacyclidine non-NMDA binding siteNon-NMDA gacyclidine binding sites on Purkinje cell dendritic trees

Gacyclidine acts as a high-affinity ligand for the GRID2 receptor, potentially modulating its role in synaptic scaffolding and cerebellar signaling.