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• W2034970017 abstract "The active site for water oxidation in photosystem II (PSII) consists of a Mn4Ca cluster close to a redox-active tyrosine residue (TyrZ). The enzyme cycles through five sequential oxidation states (S0 to S4) in the water oxidation process. Earlier electron paramagnetic resonance (EPR) work showed that metalloradical states, probably arising from the Mn4 cluster interacting with TyrZ., can be trapped by illumination of the S0, S1 and S2 states at cryogenic temperatures. The EPR signals reported were attributed to S0TyrZ., S1TyrZ. and S2TyrZ., respectively. The equivalent states were examined here by EPR in PSII isolated from Thermosynechococcus elongatus with either Sr or Ca associated with the Mn4 cluster. In order to avoid spectral contributions from the second tyrosyl radical, TyrD., PSII was used in which Tyr160 of D2 was replaced by phenylalanine. We report that the metalloradical signals attributed to TyrZ. interacting with the Mn cluster in S0, S1, S2 and also probably the S3 states are all affected by the presence of Sr. Ca/Sr exchange also affects the non-haem iron which is situated approximately 44 A units away from the Ca site. This could relate to the earlier reported modulation of the potential of QA by the occupancy of the Ca site. It is also shown that in the S3 state both visible and near-infrared light are able to induce a similar Mn photochemistry." @default.
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• W2034970017 date "2007-10-25" @default.
• W2034970017 modified "2023-10-09" @default.
• W2034970017 title "Low-temperature photochemistry in photosystem II from Thermosynechococcus elongatus induced by visible and near-infrared light" @default.
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• W2034970017 doi "https://doi.org/10.1098/rstb.2007.2216" @default.
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