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• W2059920220 endingPage "532" @default.
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• W2059920220 abstract "Reductive titration curves of flavodoxin from Desulfovibrio vulgaris displayed two one-electron steps. The redox potential E-2 for the couple oxidized flavodoxin/flavodoxin semiquinone was determined by direct titration with dithionite. E-2 was -149 plus or minus 3 mV (pH 7.78, 25 degrees C). The redox potential E-1 for the couple flavodoxin semiquinone/fully reduced flavodoxin was deduced from the equilibrium concentration of these species in the presence of hydrogenase and H-2. E-1 was -438 plus or minus 8 mV (pH 7.78, 25 degrees C). Light-absorption and fluorescence spectra of flavodoxin in its three redox states have been recorded. Both the rate and extent of reduction of flavodoxin semiguinone with dithionite were found to depend on pH. An equilibrium between the semiquinone and hydroquinone forms occurred at pH values close to the neutrality, even in the presence of a large excess of dithionite, suggesting an ionization in fully reduced flavodoxin with a pK-a = 6.6. The association constants K for the three FMN redox forms with the apoprotein were deduced from the value of K (K = 8 times 10-7 M-1) measured with oxidized EMN at pH 7.0. Oxidized flavodoxin was found to comproportionate with the fully reduced protein (k-comp = 4.3 times 10-3 M-1 times s-1, pH 9.0, 22 degrees C) and with reduced free FMN (K-comp = 44 M-1 times s-1, pH 8.1, 20 degrees C). Fast oxidation of reduced flavodoxin occurred in the presence of O-2. Slower oxidation of semiquinone was dependent on pH in a drastic way." @default.
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• W2059920220 date "1975-03-01" @default.
• W2059920220 modified "2023-10-10" @default.
• W2059920220 title "Physicochemical properties of flavodoxin from Desulfovibrio vulgaris" @default.
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• W2059920220 doi "https://doi.org/10.1016/0005-2728(75)90172-3" @default.
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