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• W2080268520 abstract "The P450cam monooxygenase from Pseudomonas putida consists of three redox proteins: NADH-putidaredoxin reductase (Pdr), putidaredoxin (Pdx), and cytochrome P450cam. The redox properties of the FAD-containing Pdr and the mechanism of Pdr-Pdx complex formation are the least studied aspects of this system. We have utilized laser flash photolysis techniques to produce the one-electron-reduced species of Pdr, to characterize its spectral and electron-transferring properties, and to investigate the mechanism of its interaction with Pdx. Upon flash-induced reduction by 5-deazariboflavin semiquinone, the flavoprotein forms a blue neutral FAD semiquinone (FADH(*)). The FAD semiquinone was unstable and partially disproportionated into fully oxidized and fully reduced flavin. The rate of FADH(*) decay was dependent on ionic strength and NAD(+). In the mixture of Pdr and Pdx, where the flavoprotein was present in excess, electron transfer (ET) from FADH(*) to the iron-sulfur cluster was observed. The Pdr-to-Pdx ET rates were maximal at an ionic strength of 0.35 where a kinetic dissociation constant (K(d)) for the transient Pdr-Pdx complex and a limiting k(obs) value were equal to 5 microM and 226 s(-1), respectively. This indicates that FADH(*) is a kinetically significant intermediate in the turnover of P450cam monooxygenase. Transient kinetics as a function of ionic strength suggest that, in contrast to the Pdx-P450cam redox couple where complex formation is predominantly electrostatic, the Pdx-Pdr association is driven by nonelectrostatic interactions." @default.
• W2080268520 created "2016-06-24" @default.
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• W2080268520 date "2001-08-10" @default.
• W2080268520 modified "2023-09-26" @default.
• W2080268520 title "Laser Flash Induced Electron Transfer in P450cam Monooxygenase: Putidaredoxin Reductase−Putidaredoxin Interaction" @default.
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• W2080268520 doi "https://doi.org/10.1021/bi010874d" @default.
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