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• W3117335763 abstract "The flavin reductase (FRED) and isobutylamine N-hydroxylase (IBAH) from Streptomyces viridifaciens constitute a two-component, flavin-dependent monooxygenase system that catalyzes the first step in valanimycin biosynthesis. FRED is an oxidoreductase that provides the reduced flavin to IBAH, which then catalyzes the hydroxylation of isobutylamine (IBA) to isobutylhydroxylamine (IBHA). In this work, we used several complementary methods to investigate FAD binding, steady-state and rapid reaction kinetics, and enzyme–enzyme interactions in the FRED:IBAH system. The affinity of FRED for FADox is higher than its affinity for FADred, consistent with its function as a flavin reductase. Conversely, IBAH binds FADred more tightly than FADox, consistent with its role as a monooxygenase. FRED exhibits a strong preference (28-fold) for NADPH over NADH as the electron source for FAD reduction. Isothermal titration calorimetry was used to study the association of FRED and IBAH. In the presence of FAD, either oxidized or reduced, FRED and IBAH associate with a dissociation constant of 7–8 μM. No interaction was observed in the absence of FAD. These results are consistent with the formation of a protein–protein complex for direct transfer of reduced flavin from the reductase to the monooxygenase in this two-component system." @default.
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• W3117335763 date "2020-12-22" @default.
• W3117335763 modified "2023-10-03" @default.
• W3117335763 title "Biochemical Characterization of the Two-Component Flavin-Dependent Monooxygenase Involved in Valanimycin Biosynthesis" @default.
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• W3117335763 doi "https://doi.org/10.1021/acs.biochem.0c00679" @default.
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