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- W2790010080 abstract "This study with recombinant reconstituted system mimicking the cellular conditions of the native cones documents that photoreceptor ROS-GC1 is modulated by gaseous CO2. Mechanistically, CO2 is sensed by carbonic anhydrase (CAII), generates bicarbonate that, in turn, directly targets the core catalytic domain of ROS-GC1, and activates it to increased synthesis of cyclic GMP. This, then, functions as a second messenger for the cone phototransduction. The study demonstrates that, in contrast to the Ca2+-modulated phototransduction, the CO2 pathway is Ca2+-independent, yet is linked with it and synergizes it. It, through R787C mutation in the third heptad of the signal helix domain of ROS-GC1, affects cone-rod dystrophy, CORD6. CORD6 is caused firstly by lowered basal and GCAP1-dependent ROS-GC1 activity and secondly, by a shift in Ca2+ sensitivity of the ROS-GC1/GCAP1 complex that remains active in darkness. Remarkably, the first but not the second defect disappears with bicarbonate thus explaining the basis for CORD6 pathological severity. Because cones, but not rods, express CAII, the excessive synthesis of cyclic GMP would be most acute in cones." @default.
- W2790010080 created "2018-03-29" @default.
- W2790010080 creator A5019911183 @default.
- W2790010080 creator A5023920092 @default.
- W2790010080 creator A5040063909 @default.
- W2790010080 date "2018-02-09" @default.
- W2790010080 modified "2023-09-26" @default.
- W2790010080 title "CO2/bicarbonate modulates cone photoreceptor ROS-GC1 and restores its CORD6-linked catalytic activity" @default.
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- W2790010080 doi "https://doi.org/10.1007/s11010-018-3317-9" @default.
- W2790010080 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/6687076" @default.
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