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• W2024365540 abstract "Absorbance difference spectra and kinetics of the photooxidation of the primary electron donor of System 1 of photosynthesis, P700, were measured at low temperatures in spinach chloroplasts and in intact cells of Chlorella vulgaris, Porphyridium aerugineum and Anacystis nidulans, and the redox state of P700 was compared with that of ferredoxin by use of electron paramagnetic resonance techniques. Analysis of the light-induced absorbance difference spectra of chloroplasts at 110 °K in the region 670–720 nm showed two components. The first one was due to Photosystem 1 and reflected the oxidation of P700. The shape of the spectrum indicated that at least three chlorophyll molecules are involved in this reaction. The second component indicated a shift to shorter wavelength of an absorbance band at 686 nm, presumably associated with the reduction of the primary electron acceptor of Photosystem 2. The photooxidation of P700 was found to be partly reversible at temperatures between 10 and 200 °K. The extent of the irreversible part increased with decreasing temperature. Below 150 °K, the decay of the reversible part was biphasic. The first-order rate constants obtained were 2.0 and 0.03 s−1, independent of the temperature; the extents of both phases of the decay were about equal. The photoreduction of ferredoxin was also partially reversible and the kinetics were identical to those of P700. These results indicate that below 150 °K three types of reaction centers of Photosystem 1 occur. Ferredoxin is the only electron acceptor, but the rates of the back reaction of reduced ferredoxin with oxidized P700 are different for each type of reaction center." @default.
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• W2024365540 date "1974-11-01" @default.
• W2024365540 modified "2023-10-12" @default.
• W2024365540 title "Light-induced reactions of ferredoxin and P700 at low temperatures" @default.
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• W2024365540 doi "https://doi.org/10.1016/0005-2728(74)90152-2" @default.
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