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Structural Change Of The Mn Cluster During The S2→S3 State Transition Of The Oxygen-Evolving Complex Of Photosystem Ii. Does It Reflect The Onset Of Water/Substrate Oxidation? Determination By Mn X-Ray Absorption Spectroscopy, Wenchuan Liang, Theo A. Toelofs, Roehl M. Cinco, Annette Rompel, Matthew J. Latimer, Edward Yu, Kenneth Sauer, Melvin P. Klein, Vittal K. Yachandra
Structural Change Of The Mn Cluster During The S2→S3 State Transition Of The Oxygen-Evolving Complex Of Photosystem Ii. Does It Reflect The Onset Of Water/Substrate Oxidation? Determination By Mn X-Ray Absorption Spectroscopy, Wenchuan Liang, Theo A. Toelofs, Roehl M. Cinco, Annette Rompel, Matthew J. Latimer, Edward Yu, Kenneth Sauer, Melvin P. Klein, Vittal K. Yachandra
Edward Yu
The oxygen-evolving complex of Photosystem II in plants and cyanobacteria catalyzes the oxidation of two water molecules to one molecule of dioxygen. A tetranuclear Mn complex is believed to cycle through five intermediate states (S0−S4) to couple the four-electron oxidation of water with the one-electron photochemistry occurring at the Photosystem II reaction center. We have used X-ray absorption spectroscopy to study the local structure of the Mn complex and have proposed a model for it, based on studies of the Mn K-edges and the extended X-ray absorption fine structure of the S1 and S2 states. The proposed model consists of …