A photic visual cycle of rhodopsin regeneration is dependent on Rgr

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 con...

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Veröffentlicht in:Nature genetics 2001-07, Vol.28 (3), p.256-260
Hauptverfasser: Fong, Henry K.W, Chen, Pu, Hao, Wenshan, Rife, Lawrence, Wang, Xiao Peng, Shen, Daiwei, Chen, Jeannie, Ogden, Thomas, Van Boemel, Gretchen B, Wu, Lanyin, Yang, Mao
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container_issue 3
container_start_page 256
container_title Nature genetics
container_volume 28
creator Fong, Henry K.W
Chen, Pu
Hao, Wenshan
Rife, Lawrence
Wang, Xiao Peng
Shen, Daiwei
Chen, Jeannie
Ogden, Thomas
Van Boemel, Gretchen B
Wu, Lanyin
Yang, Mao
description 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.
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subjects 11-cis-Retinal
Adaptation
Animals
Biological and medical sciences
Cell physiology
Classical genetics, quantitative genetics, hybrids
Darkness
Dose-Response Relationship, Radiation
Electroretinography
Eye - metabolism
Eye - radiation effects
Eye Proteins - genetics
Eye Proteins - metabolism
Fundamental and applied biological sciences. Psychology
Genetic aspects
Genetics of eukaryotes. Biological and molecular evolution
Irradiation
Light
Mice
Mice, Mutant Strains
Models, Chemical
Molecular and cellular biology
Mutation
Neurosciences
Photic Stimulation
Photoactivation
Photobiology
Physiological aspects
pigment epithelium
Proteins
Publishing
Receptors, Cell Surface - genetics
Receptors, Cell Surface - metabolism
Receptors, G-Protein-Coupled
retinal pigment epithelium
Retinal Rod Photoreceptor Cells - metabolism
Retinal Rod Photoreceptor Cells - radiation effects
Retinaldehyde - metabolism
Rgr gene
Rhodopsin
Rhodopsin - metabolism
Rhodopsin - radiation effects
Vertebrata
Vision, photoreception
title A photic visual cycle of rhodopsin regeneration is dependent on Rgr
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