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• W4308344582 abstract "The white-rot fungus Phanerochaete chrysosporium can degrade lignin polymers using extracellular, non-specific, one-electron oxidizing enzymes. This results in the formation of guaiacyl (G), syringyl (S), and hydroxyphenyl (H) units, such as vanillic acid, syringic acid, and p-hydroxybenzoic acid (p-HBA) and the corresponding aldehydes, which are further metabolized intracellularly. Therefore, the aim of this study was to identify proteins involved in the hydroxylation of H-unit fragments such as p-HBA and its decarboxylated product hydroquinone (HQ) in P. chrysosporium. A flavoprotein monooxygenase (FPMO), PcFPMO2, was identified and its activity was characterized. Recombinant PcFPMO2 with an N-terminal polyhistidine tag was produced in Escherichia coli and purified. In the presence of NADPH, PcFPMO2 used six phenolic compounds as substrates. PcFPMO2 catalyzed the hydroxylation of the H-unit fragments such as p-HBA and HQ, and the G-unit derivative methoxyhydroquinone (MHQ). The highest catalytic efficiency (kcat/Km) was observed with HQ, indicating that PcFPMO2 could be involved in HQ hydroxylation in vivo. Additionally, PcFPMO2 converted MHQ to 3-, 5-, and 6-methoxy-1,2,4-trihydroxybenzene (3-, 5-, and 6-MTHB), respectively, suggesting that PcFPMO2 might partially be involved in MHQ degradation, following aromatic ring fission, via three MTHBs. FPMOs are divided into eight groups (groups A to H). This is the first study to show MHQ hydroxylase activity of a FPMO-group A superfamily member. These findings highlight the unique substrate spectrum of PcFPMO2, making it an attractive candidate for biotechnological applications." @default.
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• W4308344582 date "2023-01-01" @default.
• W4308344582 modified "2023-10-18" @default.
• W4308344582 title "Biochemical characterization of hydroquinone hydroxylase from Phanerochaete chrysosporium" @default.
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• W4308344582 doi "https://doi.org/10.1016/j.jbiosc.2022.10.001" @default.
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