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- W2062625687 abstract "The photosynthetic oxidation of water to oxygen occurs in photosystem II (PSII) at an active site composed of a tetranuclear cluster of manganese ions, a redox active tyrosine, YZ, and two essential cofactors, calcium and chloride. Recently, several experimental observations have led to the proposal of a metalloradical catalytic cycle in which water oxidation occurs via hydrogen-atom abstraction by the tyrosyl radical from water bound to the manganese cluster. This model predicts a close proximity between the radical tyrosine, Yz•, and the Mn cluster and the involvement of the radical in a bifurcated hydrogen bond. Magnetic resonance techniques have been used in this work to probe the interaction of the tyrosyl radical with its environment in PSII samples in which the catalytic cycle is blocked by acetate treatment and the enzyme is trapped in a paramagnetic S2Yz• state. Radical interaction with the metal cluster has been studied via simulations of the EPR spectra obtained for this state. The simulations ..." @default.
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- W2062625687 date "1998-08-13" @default.
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- W2062625687 title "Interaction of YZ• with Its Environment in Acetate-Treated Photosystem II Membranes and Reaction Center Cores" @default.
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- W2062625687 doi "https://doi.org/10.1021/jp981609d" @default.
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