The S0 State of the Oxygen-Evolving Complex in Photosystem II Is Paramagnetic: Detection of an EPR Multiline Signal.
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چکیده
منابع مشابه
Comparative studies of the S0 and S2 multiline electron paramagnetic resonance signals from the manganese cluster in Photosystem II.
Electron paramagnetic resonance (EPR) spectroscopy is one of the major techniques used to analyse the structure and function of the water oxidising complex (WOC) in Photosystem II. The discovery of an EPR signal from the S0 state has opened the way for new experiments, aiming to characterise the S0 state and elucidate the differences between the different S states. We present a review of the bi...
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The Mn K-edge x-ray absorption spectra for the pure S states of the tetranuclear Mn cluster of the oxygen-evolving complex of photosystem II during flash-induced S-state cycling have been determined. The relative S-state populations in samples given 0, 1, 2, 3, 4, or 5 flashes were determined from fitting the flash-induced electron paramagnetic resonance (EPR) multiline signal oscillation patte...
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The Mn(4)-cluster of photosystem II (PSII) from Synechococcus elongatus was studied by electron paramagnetic resonance (EPR) spectroscopy after a series of saturating laser flashes given in the presence of either methanol or ethanol. Results were compared to those obtained in similar experiments done on PSII isolated from plants. The flash-dependent changes in amplitude of the EPR multiline sig...
متن کاملEnergetics of the S 2 State Spin Isomers of the Oxygen - Evolving 2 Complex of Photosystem II
6 ABSTRACT: The S2 redox intermediate of the oxygen-evolving 7 complex in photosystem II is present as two spin isomers. The S = 8 1/2 isomer gives rise to a multiline electron paramagnetic resonance 9 (EPR) signal at g = 2.0, whereas the S = 5/2 isomer exhibits a broad 10 EPR signal at g = 4.1. The electronic structures of these isomers are 11 known, but their role in the catalytic cycle of wa...
متن کاملEnergetics of the S2 State Spin Isomers of the Oxygen-Evolving Complex of Photosystem II.
The S2 redox intermediate of the oxygen-evolving complex in photosystem II is present as two spin isomers. The S = 1/2 isomer gives rise to a multiline electron paramagnetic resonance (EPR) signal at g = 2.0, whereas the S = 5/2 isomer exhibits a broad EPR signal at g = 4.1. The electronic structures of these isomers are known, but their role in the catalytic cycle of water oxidation remains un...
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عنوان ژورنال:
- Journal of the American Chemical Society
دوره 119 46 شماره
صفحات -
تاریخ انتشار 1997