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- W3160501854 abstract "We derive a model that provides an exact solution to the substrate-water exchange kinetics in a double-conformation system and use this model to interpret recently published data for Ca2+- and Sr2+-containing PSII in the S2 state, in which the g = 2.0 and g = 4.1 conformations coexist. The component concentrations derived from the kinetic model provide an analytic description of the substrate-water exchange kinetics, allowing us to more accurately interpret the results. Based on this model and the previously reported data on the S2 state g = 2.0 conformation, we obtain the substrate-water exchange rates of the g = 4.1 conformation and the conformational change rates. Two conclusions are made from the analyses. First, contrary to previous reports, there is no significant effect of substituting Sr2+ for Ca2+ on any of the exchange rate constants. Second, the exchange rate of the slowly-exchanging water (Ws) in the S2 state g = 4.1 conformation is much faster than that in the S2 state g = 2.0 conformation. The second conclusion is consistent with the assignment of Ws to W1 or W2 bound as terminal ligands to Mn4; Mn4 has been proposed to undergo an oxidation state change from Mn(IV) in the g = 2.0 conformation to Mn(III) in the g = 4.1 conformation." @default.
- W3160501854 created "2021-05-24" @default.
- W3160501854 creator A5041449966 @default.
- W3160501854 creator A5064040856 @default.
- W3160501854 date "2021-01-01" @default.
- W3160501854 modified "2023-10-14" @default.
- W3160501854 title "Kinetic modeling of substrate-water exchange in Photosystem II" @default.
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- W3160501854 doi "https://doi.org/10.1016/j.bbadva.2021.100014" @default.
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