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- W2080546907 abstract "Protons in the vicinity of the oxygen-evolving manganese cluster in photosystem II were studied by proton matrix ENDOR. Six pairs of proton ENDOR signals were detected in both the S(0) and S(2) states of the Mn-cluster. Two pairs of signals that show hyperfine constants of 2.3/2.2 and 4.0 MHz, respectively, disappeared after D(2)O incubation in both states. The signals with 2.3/2.2 MHz hyperfine constants in S(0) and S(2) state multiline disappeared after 3 h of D(2)O incubation in the S(0) and S(1) states, respectively. The signal with 4.0 MHz hyperfine constants in S(0) state multiline disappeared after 3 h of D(2)O incubation in the S(0) state, while the similar signal in S(2) state multiline disappeared only after 24 h of D(2)O incubation in the S(1) state. The different proton exchange rates seem to be ascribable to the change in affinities of water molecules to the variation in oxidation state of the Mn cluster during the water oxidation cycle. Based on the point dipole approximation, the distances between the center of electronic spin of the Mn cluster and the exchangeable protons were estimated to be 3.3/3.2 and 2.7 A, respectively. These short distances suggest the protons belong to the water molecules ligated to the manganese cluster. We propose a model for the binding of water to the manganese cluster based on these results." @default.
- W2080546907 created "2016-06-24" @default.
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- W2080546907 date "2007-03-01" @default.
- W2080546907 modified "2023-10-11" @default.
- W2080546907 title "Protons bound to the Mn cluster in photosystem II oxygen evolving complex detected by proton matrix ENDOR" @default.
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- W2080546907 doi "https://doi.org/10.1016/j.bbabio.2007.02.001" @default.
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