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- W2034372505 startingPage "1421" @default.
- W2034372505 abstract "Chloride is an essential cofactor for photosynthetic water oxidation. However, its location and functional roles in active photosystem II are still a matter of debate. We have investigated this issue by studying the effects of Cl− replacement by Br− in active PSII. In Br− substituted samples, Cl− is effectively replaced by Br− in the presence of 1.2 M NaBr under room light with protection of anaerobic atmosphere followed by dialysis. The following results have been obtained. i) The oxygen-evolving activities of the Br−-PSII samples are significantly lower than that of the Cl−-PSII samples; ii) The same S2 multiline EPR signals are observed in both Br− and Cl−-PSII samples; iii) The amplitudes of the visible light induced S1TyrZ• and S2TyrZ• EPR signals are significantly decreased after Br− substitution; the S1TyrZ• EPR signal is up-shifted about 8 G, whereas the S2TyrZ• signal is down-shifted about 12 G after Br− substitution. These results imply that the redox properties of TyrZ and spin interactions between TyrZ• and Mn-cluster could be significantly modified due to Br− substitution. It is suggested that Cl−/Br− probably coordinates to the Ca2+ ion of the Mn-cluster in active photosystem II." @default.
- W2034372505 created "2016-06-24" @default.
- W2034372505 creator A5037830913 @default.
- W2034372505 creator A5049823434 @default.
- W2034372505 creator A5070260842 @default.
- W2034372505 date "2010-08-01" @default.
- W2034372505 modified "2023-09-27" @default.
- W2034372505 title "Substitution of chloride by bromide modifies the low-temperature tyrosine Z oxidation in active photosystem II" @default.
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- W2034372505 doi "https://doi.org/10.1016/j.bbabio.2010.02.025" @default.
- W2034372505 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/20206122" @default.
- W2034372505 hasPublicationYear "2010" @default.
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