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• W2043640564 abstract "Cytochrome c-554 of the ammonia-oxidizing chemolithoautotropic bacteria is thought to mediate electron transfer from hydroxylamine oxidoreductase to a terminal oxidase and/or to ammonia monooxygenase. The cytochrome has four c hemes which interact magnetically and have the same redox potential. We report that the kinetics of reduction of ferric cytochrome c-554 by dithionite or the oxidation of ferrous cytochrome c-554 by O2 or H2O2 are complex and multiphasic. Transient rapid-scan difference spectra indicate discrete maxima at approximately 418 nm, 425 nm and 432 nm. Absorbance changes at all three difference maxima appear to occur in all kinetic phases, although not in equal amounts for each wavelength. Reduction by 20 mM dithionite was biphasic. At pH 7.5 the first phase, which involved approximately 50% of the total absorbance change, had a rate constant (20°C) of 140 s−1 and energy of activation of 20 kJ · mol−1. The slow phase had a rate constant 0.43 s−1 and a relatively high energy of activation, 87 kJ · mol−1, suggesting that a change in protein configuration accompanied the reaction. As the pH of the solution increased, the rate constant for both phases decreased and the fraction of absorbance change in the rapid phase increased. Oxidation of ferrous cytochrome c-554 by O2 involved a discrete rapid phase with a rate constant of 14 s−1, accounting for 6% of the absorbance. The remainder of the reaction was multiphasic with rate constants in the range 0.1–0.01 s−1. With H2O2 as the oxidant, the rapid phase involved 39% of the change in absorbance with a rate constant of 19 s−1. The remainder of the reoxidation was multiphasic with rate constants ranging over 0.4–0.01 s−1." @default.
• W2043640564 created "2016-06-24" @default.
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• W2043640564 date "1987-01-01" @default.
• W2043640564 modified "2023-09-24" @default.
• W2043640564 title "Conformational change accompanies redox reactions of the tetraheme cytochrome c-554 of Nitrosomonas europaea" @default.
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• W2043640564 doi "https://doi.org/10.1111/j.1432-1033.1987.tb10600.x" @default.
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