Metabotropic glutamate receptor 6 (GRM6)

Metabotropic glutamate receptor 6 (GRM6, also known as mGluR6) is a class C G protein-coupled receptor (GPCR) specifically expressed in the retina, primarily localized on ON bipolar cells where it mediates visual signal transduction from photoreceptors to other retinal neurons[1][2][4][6]. It is activated by the neurotransmitter glutamate, resulting in a conformational change that initiates intracellular signaling via G proteins, primarily inhibiting adenylate cyclase and modulating the TRPM1 channel to control visual signaling. Mutations in the GRM6 gene are a known cause of congenital stationary night blindness type 1B, indicating a critical role for this receptor in normal vision. GRM6 remains a subject of experimental pharmacological research, especially in the context of structure-function analysis and the search for selective modulators, but is not yet a clinical drug target.

Other names

Metabotropic glutamate receptor 6GRM6mGluR6GPRC1FMGLUR6mGlu6CSNB1BGRM6_HUMANglutamate receptor, metabotropic 6

Agonists (such as L-glutamate) bind to the orthosteric site and activate the receptor, resulting in G protein–mediated inhibition of adenylate cyclase; experimental allosteric modulators can increase or decrease signaling by binding to alternative receptor sites[3][6].