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- W2019299030 abstract "The recent finding of a transition state with a significantly lower barrier than previously found, has made the mechanism for O–O bond formation in photosystem II much clearer. The full mechanism can be described in the following way. Electrons and protons are ejected from the oxygen-evolving complex (OEC) in an alternating fashion, avoiding unnecessary build-up of charge. The S 0 –S 1 and S 1 –S 2 transitions are quite exergonic, while the S 2 –S 3 transition is only weakly exergonic. The strong endergonic S 3 –S 4 transition is a key step in the mechanism in which an oxygen radical is produced, held by the dangling manganese outside the Mn 3 Ca cube. The O–O bond formation in the S 4 -state occurs by an attack of the oxygen radical on a bridging oxo ligand in the cube. The mechanism explains the presence of both a cube with bridging oxo ligands and a dangling manganese. Optimal orbital overlap puts further constraints on the structure of the OEC. An alternating spin alignment is necessary for a low barrier. The computed rate-limiting barrier of 14.7 kcal mol −1 is in good agreement with experiments." @default.
- W2019299030 created "2016-06-24" @default.
- W2019299030 creator A5068989141 @default.
- W2019299030 date "2007-10-29" @default.
- W2019299030 modified "2023-10-16" @default.
- W2019299030 title "Mechanism and energy diagram for O–O bond formation in the oxygen-evolving complex in photosystem II" @default.
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- W2019299030 doi "https://doi.org/10.1098/rstb.2007.2218" @default.
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