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• W1978136157 abstract "This study presents a thorough analysis of the reaction pattern of flash-induced oxygen evolution in spinach thylakoids as a function of pH (4.5 < or = pH < or = 9) and the redox state of tyrosine YD in polypeptide D2. Evaluation of the experimental data within the conventional Kok model [Kok, B., Forbush, B., & McGloin, M. (1970) Photochem. Photobiol. 11, 457-475] led to the following results: (1) the probability of the miss factor is strongly pH dependent (with a pronounced minimum near neutral pH) while the double hit factor is less affected; (2) a marked increase of the apparent S0 population arises at alkaline pH in dark-adapted samples where most of the YD is reduced, but this effect is absent if the percentage of PS II containing the oxidized form YDox is high; and (3) the lifetimes of S2 and S3 exhibit a characteristic pH dependence that is indicative of conformational changes of functional relevance within the water-oxidizing complex and its environment; (4) the kinetic interaction of redox states S2 and S3 with YD is characterized by a change of its behavior at a threshold pH of 6.5-7.0; and (5) at acidic pH values the extent of S2 and S3 reduction by YD decreases concomitant with the occurrence of a very fast decay kinetics. On the basis of a detailed discussion of these results and data from the literature, the water oxidase is inferred to undergo structural changes at pH values of 5-5.5 and 6.5-7.0. These transitions are almost independent of the redox state Si and modify the reaction coordinates of the water oxidase toward endogenous reductants." @default.
• W1978136157 created "2016-06-24" @default.
• W1978136157 creator A5045637353 @default.
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• W1978136157 date "1994-09-13" @default.
• W1978136157 modified "2023-10-08" @default.
• W1978136157 title "Analyses of pH-Induced Modifications of the Period Four Oscillation of Flash-Induced Oxygen Evolution Reveal Distinct Structural Changes of the Photosystem II Donor Side at Characteristic pH Values" @default.
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• W1978136157 doi "https://doi.org/10.1021/bi00202a008" @default.
• W1978136157 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/8086406" @default.
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