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- W2095452816 abstract "Protoporphyrinogen oxidase (PPO) is a flavin adenine dinucleotide (FAD)-containing enzyme in the tetrapyrrole biosynthetic pathway that leads to the formation of both heme and chlorophylls, which has been identified as one of the most important action targets of commercial herbicides. The literature reports gave different PPO-catalytic kinetic parameters for the substrate protoporphyrinogen IX (Km of 0.1 to 10.4 μM) with different sources of PPO using fluorescent or HPLC methods. Herein we assayed the enzymatic activity of recombinant Bacillus subtilis PPO by using capillary electrophoresis (CE), a method with high separation efficiency, easy automation, and low sample consumption. The Michaelis constant and maximum reaction velocity were determined as 7.0 ± 0.6 μM and 0.38 ± 0.02 μmol min-1 μg−1, respectively. The interaction between PPO and acifluorfen, a commercial PPO-inhibiting herbicide, was measured as the inhibition constant 186.9 ± 9.3 μМ. The relationship between cofactor FAD and PPO activity can also be quantitatively studied by this CE method. The CE method used here should also be a convenient, reliable method for PPO study." @default.
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- W2095452816 date "2008-12-01" @default.
- W2095452816 modified "2023-10-03" @default.
- W2095452816 title "A capillary electrophoresis assay for recombinant Bacillus subtilis protoporphyrinogen oxidase" @default.
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- W2095452816 doi "https://doi.org/10.1016/j.ab.2008.09.023" @default.
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