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- W1979044106 abstract "We have investigated the EPR characteristics of native QB and QB analogues in higher plant PS II. We show that, as in cyanobacteria, an interaction between QA and QB iron-semiquinones (QA−-Fe2+-QB−) is observed which gives an EPR signal near g=1.6. Bicarbonate binding close to the non-haem iron is required to observe this interaction. The EPR signal of QB semiquinone is weak and difficult to distinguish from that of QA. The appearance of the g=1.6 signal from QA−-Fe2+-QB− after 77 K illumination is a better marker for the presence of QB semiquinone. The yield of QB semiquinone in plant PS II is lower than found in cyanobacteria. The brominated quinones DBMIB, TBTQ and bromanil were used as QB analogues to increase the yield of QA−-Fe2+-QB−. These analogues act by forming a stable semiquinone at the QB site and not by covalent binding." @default.
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- W1979044106 date "1991-08-01" @default.
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- W1979044106 title "Identification and characterisation of EPR signals involving QB semiquinone in plant Photosystem II" @default.
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- W1979044106 doi "https://doi.org/10.1016/s0005-2728(05)80203-8" @default.
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