Recoverin (RCVRN)

Recoverin is a 23 kDa neuronal calcium-binding protein predominately found in the photoreceptor cells of the vertebrate retina[1][2][3][4]. It belongs to the neuronal calcium sensor family and contains several EF-hand domains responsible for calcium binding[2][4]. Recoverin plays a crucial role in regulating the visual phototransduction cascade by inhibiting rhodopsin kinase (also known as G protein-coupled receptor kinase 1, GRK1) in a calcium-dependent manner[1][2][5]. Under low light (darkness), calcium-bound recoverin inhibits GRK1, preventing phosphorylation of activated rhodopsin and thereby prolonging the visual signal[2][3][4]. During illumination, the decrease in intracellular calcium releases the inhibition, enabling GRK1 to phosphorylate and deactivate rhodopsin, which allows signal termination and aids sensory adaptation of photoreceptors[1][2][3]. Recoverin also influences signal transmission between rods and bipolar cells and may have additional modulatory functions in the retina[1][2][3]. Recoverin is notable as an autoantigen in cancer-associated retinopathy, where autoantibodies against recoverin contribute to retinal dysfunction[1][3]. No approved drugs specifically target recoverin; its role is mainly established in the context of retinal physiology and disease such as CAR.

Other names

RecoverinRCV1Protein CARCancer-associated retinopathy proteincancer-associated retinopathy antigen

Inhibition of rhodopsin kinase-mediated phosphorylation of rhodopsin, Regulation of visual pigment deactivation, Negative calcium feedback in light adaptation