| First Author | Chen P | Year | 2001 |
| Journal | Nat Genet | Volume | 28 |
| Issue | 3 | Pages | 256-60 |
| PubMed ID | 11431696 | Mgi Jnum | J:77333 |
| Mgi Id | MGI:2181438 | Doi | 10.1038/90089 |
| Citation | Chen P, et al. (2001) A photic visual cycle of rhodopsin regeneration is dependent on Rgr. Nat Genet 28(3):256-60 |
| abstractText | During visual excitation, rhodopsin undergoes photoactivation and bleaches to opsin and all-trans-retinal. To regenerate rhodopsin and maintain normal visual sensitivity, the all-trans isomer must be metabolized and reisomerized to produce the chromophore 11-cis-retinal in biochemical steps that constitute the visual cycle and involve the retinal pigment epithelium (RPE; refs. 3-8). A key step in the visual cycle is isomerization of an all-trans retinoid to 11-cis-retinol in the RPE (refs. 9-11). It could be that the retinochrome-like opsins, peropsin, or the retinal G protein-coupled receptor (RGR) opsin12-16 are isomerases in the RPE. In contrast to visual pigments, RGR is bound predominantly to endogenous all-trans-retinal, and irradiation of RGR in vitro results in stereospecific conversion of the bound all-trans isomer to 11-cis-retinal. Here we show that RGR is involved in the formation of 11-cis-retinal in mice and functions in a light-dependent pathway of the rod visual cycle. Mutations in the human gene encoding RGR are associated with retinitis pigmentosa. |
