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• W1981584803 startingPage "145" @default.
• W1981584803 abstract "The conversion of cytochrome (Cyt) b-559 from the low-potential (LP) to the high-potential (HP) form under conditions for photoactivation of O2 evolution (reconstitution of the Mn cluster) was investigated using Photosystem II (PS II) membranes that had been depleted of the Mn cluster by treatment with Tris. Illumination of the PS II membranes with continuous or flashing light in the presence of 0.1 mM Mn2+ reactivated O2 evolution and increased the level of the HP form of Cyt b-559 with a concomitant decrease in the level of the LP form. When illumination was achieved with flashing light, the restoration of the HP form occurred after two flashes, while reactivation of O2 evolution required more than six flashes. It was also found that the HP form could be restored when the PS II membranes were illuminated in the presence of artificial electron donors instead of Mn2+. NH2OH (10–100 μM), 1,5-diphenylcarbazide (50–100 μM) and semicarbazide (0.5–1 mM) were effective in restoring the HP form. These observations suggest that, under photoactivation conditions, not the reconstitution of the Mn cluster but electron donation by Mn2+ to PS II is responsible for the restoration of the HP form. The restoration of the HP form by illumination in the presence of Mn2+ was not affected by 3-(3,4-dichlorophenyl)-1,1-dimethylurea (DCMU) but it was completely suppressed by artificial electron acceptors which bind to the QB site and reoxidize QA−, namely, 2,5-dibromo-3-methyl-6-isopropyl-1,4-benzoquinone (DBMIB) and 2,6-dichloro-1,4-benzoquinone. These results suggest that some redox reaction(s) at the acceptor side of PS II, which probably involves QA−, occurs during the course of the restoration of the HP form." @default.
• W1981584803 created "2016-06-24" @default.
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• W1981584803 date "1997-01-01" @default.
• W1981584803 modified "2023-10-15" @default.
• W1981584803 title "Restoration of the high-potential form of cytochrome b-559 by electron transport reactions through Photosystem II in Tris-treated Photosystem II membranes" @default.
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• W1981584803 doi "https://doi.org/10.1016/s0005-2728(96)00130-2" @default.
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