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• W2070163247 abstract "Cone photoreceptors function under daylight conditions and are essential for color perception and vision with high temporal and spatial resolution. A remarkable feature of cones is that, unlike rods, they remain responsive in bright light. In rods, light triggers a decline in intracellular calcium, which exerts a well studied negative feedback on phototransduction that includes calcium-dependent inhibition of rhodopsin kinase (GRK1) by recoverin. Rods and cones share the same isoforms of recoverin and GRK1, and photoactivation also triggers a calcium decline in cones. However, the molecular mechanisms by which calcium exerts negative feedback on cone phototransduction through recoverin and GRK1 are not well understood. Here, we examined this question using mice expressing various levels of GRK1 or lacking recoverin. We show that although GRK1 is required for the timely inactivation of mouse cone photoresponse, gradually increasing its expression progressively delays the cone response recovery. This surprising result is in contrast with the known effect of increasing GRK1 expression in rods. Notably, the kinetics of cone responses converge and become independent of GRK1 levels for flashes activating more than ∼1% of cone pigment. Thus, mouse cone response recovery in bright light is independent of pigment phosphorylation and likely reflects the spontaneous decay of photoactivated visual pigment. We also find that recoverin potentiates the sensitivity of cones in dim light conditions but does not contribute to their capacity to function in bright light." @default.
• W2070163247 created "2016-06-24" @default.
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• W2070163247 date "2015-04-01" @default.
• W2070163247 modified "2023-10-16" @default.
• W2070163247 title "Regulation of Mammalian Cone Phototransduction by Recoverin and Rhodopsin Kinase" @default.
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• W2070163247 doi "https://doi.org/10.1074/jbc.m115.639591" @default.
• W2070163247 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/4423708" @default.
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• W2070163247 hasPublicationYear "2015" @default.
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