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• W2775352716 endingPage "1271" @default.
• W2775352716 startingPage "1265" @default.
• W2775352716 abstract "Cytochrome P450s (CYPs) are known to play a major role in metabolizing a wide range compounds. CYP6FU1 has been found to be over-expressed in a deltamethrin-resistant strain of Laodelphax striatellus. This study was conducted to express CYP6FU1 in Sf9 cells as a recombinant protein, to confirm its ability to degrade deltamethrin, chlorpyrifos, imidacloprid and traditional P450 probing substrates.Carbon monoxide difference spectrum analysis indicated that the intact CYP6FU1 protein was expressed in insect Sf9 cells. Catalytic activity tests with four traditional P450 probing substrates revealed that the expressed CYP6FU1 preferentially metabolized p-nitroanisole and ethoxyresorufin, but not ethoxycoumarin and luciferin-HEGE. The enzyme kinetic parameters were tested using p-nitroanisole. The michaelis constant (Km ) and catalytic constant (Kcat ) values were 17.51 ± 4.29 µm and 0.218 ± 0.001 pmol min-1 mg-1 protein, respectively. Furthermore, CYP6FU1 activity for degradation of insecticides was tested by measuring substrate depletion and metabolite formation. The chromatogram analysis showed obvious nicotinamide-adenine dinucleotide phosphate (NADPH)-dependent depletion of deltamethrin, and formation of the unknown metabolite. Mass spectra and the molecular docking model showed that the metabolite was 4-hydroxy-deltamethrin. However, the recombinant CYP6FU1 could not metabolize imidacloprid and chlorpyrifos.These results confirmed that the over-expressed CYP6FU1 contributes to deltamethrin resistance in L. striatellus, and p-nitroanisole might be a potential diagnostic probe for deltamethrin metabolic resistance detection and monitoring. © 2017 Society of Chemical Industry." @default.
• W2775352716 created "2017-12-22" @default.
• W2775352716 creator A5010206045 @default.
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• W2775352716 date "2018-02-21" @default.
• W2775352716 modified "2023-10-02" @default.
• W2775352716 title "Deltamethrin is metabolized by CYP6FU1, a cytochrome P450 associated with pyrethroid resistance, in<i>Laodelphax striatellus</i>" @default.
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• W2775352716 doi "https://doi.org/10.1002/ps.4808" @default.
• W2775352716 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/29194952" @default.
• W2775352716 hasPublicationYear "2018" @default.
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