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- W2019436256 abstract "Electron transfer (ET) processes in reaction centers (RC) of photosystem II (PSII) are prerequisites of oxygen generation. They are promoted by energy transfer from antenna to RC. Here, we calculated the redox potentials of chlorophylla/β-carotene (Chla/Car) in PSII CP43/CP47 antenna complexes, solving the linearized Poisson−Boltzmann (LPB) equation based on the PSII crystal structure. The majority of antenna Chla redox potentials for reduction/oxidation were lower than those of RC Chla. Hence, ET events with excess electrons remain localized in the RC. Simultaneously antenna Chla can serve as an efficient cation sink to rereduce RC Chla if normal PSII function is inhibited. Especially three antenna Chla (Chl-47, Chl-18, and Chl-12) and two Car bridging the space between ChlZ(D1) and cytochrome (cyt) b559 have the same level of oxidation redox potential. Together with ChlZ(D2) they form an electron hole transfer pathway and temporary storage device guiding from the oxidized P680+• Chla to the cyt b559. This path may play a photoprotective role as efficient electron hole quencher." @default.
- W2019436256 created "2016-06-24" @default.
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- W2019436256 date "2005-01-25" @default.
- W2019436256 modified "2023-09-26" @default.
- W2019436256 title "Redox Potentials of Chlorophylls and β-Carotene in the Antenna Complexes of Photosystem II" @default.
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- W2019436256 doi "https://doi.org/10.1021/ja045058i" @default.
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