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- W2891561968 abstract "Natural anion channelrhodopsins (ACRs) have recently received increased attention because of their effectiveness in optogenetic manipulation for neuronal silencing. In this study, we focused on Proteomonas sulcata ACR1 (PsuACR1), which has rapid channel closing kinetics and a rapid recovery to the initial state of its anion channel function that is useful for rapid optogenetic control. To reveal the anion concentration dependency of the channel function, we investigated the photochemical properties of PsuACR1 using spectroscopic techniques. Recombinant PsuACR1 exhibited a Cl- dependent spectral red-shift from 531 nm at 0.1 mM to 535 nm at 1000 mM, suggesting that it binds Cl- in the initial state with a Kd of 5.5 mM. Flash-photolysis experiments revealed that the photocycle was significantly changed at high Cl- concentrations, which led not only to suppression of the accumulation of the M-intermediate involved in the Cl- non-conducting state but also to a drastic change in the equilibrium state of the other photo-intermediates. Because of this, the Cl- conducting state is protracted by one order of magnitude, which implies an impairment of the rapid channel closing of PsuACR1 in the presence of high concentrations of Cl-." @default.
- W2891561968 created "2018-09-27" @default.
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- W2891561968 date "2018-09-07" @default.
- W2891561968 modified "2023-10-16" @default.
- W2891561968 title "Implications for the impairment of the rapid channel closing of Proteomonas sulcata anion channelrhodopsin 1 at high Cl− concentrations" @default.
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- W2891561968 doi "https://doi.org/10.1038/s41598-018-31742-6" @default.
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