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- W2084765780 abstract "The correlation between the reduction of Q(A) and the oxidation of Tyr(Z) or Car/Chl(Z)/Cyt(b559) in spinach PSII enriched membranes induced by visible light at 10 K is studied by using electron paramagnetic resonance spectroscopy. Similar g=1.95-1.86 Q(A)(-*)EPR signals are observed in both Mn-depleted and intact samples, and both signals are long lived at low temperatures. The presence of PPBQ significantly diminished the light induced EPR signals from Q(A)(-*), Car(+*)/Chl(+*) and oxidized Cyt(b559), while enhancing the amplitude of the S(1)Tyr(Z)* EPR signal in the intact PSII sample. The quantification and stability of the g=1.95-1.86 EPR signal and signals arising from the oxidized Tyr(Z) and the side-path electron donors, respectively, indicate that the EPR-detectable g=1.95-1.86 Q(A)(-*) signal is only correlated to reaction centers undergoing oxidation of the side-path electron donors (Car/Chl(Z)/Cyt(b559)), but not of Tyr(Z). These results imply that two types of Q(A)(-*) probably exist in the intact PSII sample. The structural difference and possible function of the two types of Q(A) are discussed." @default.
- W2084765780 created "2016-06-24" @default.
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- W2084765780 date "2010-03-01" @default.
- W2084765780 modified "2023-09-25" @default.
- W2084765780 title "Low-temperature electron transfer suggests two types of QA in intact photosystem II" @default.
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- W2084765780 doi "https://doi.org/10.1016/j.bbabio.2009.12.001" @default.
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