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- W1592741796 abstract "The phosphotriesterase produced from the opd cistron of Pseudomonas diminuta was purified 1500-fold to homogeneity using a combination of gel filtration, ion exchange, hydrophobic, and dye matrix chromatographic steps. This is the first organophosphate triesterase or organophosphofluoridate hydrolyzing enzyme to be purified to homogeneity. The enzyme is a monomeric, spherical protein having a molecular weight of 39,000. A single zinc atom is bound to the enzyme and is required for catalytic activity. Incubation with metal chelating compounds, o-phenanthroline, EDTA, or 2,6-pyridine dicarboxylate inactivate the enzyme. The kinetic rate constants, kcat and kcat/Km, for the hydrolysis of paraoxon are 2100 s-1 and 4 x 10(7) M-1 s-1, respectively. The enzyme is inhibited competitively by dithiothreitol, dithioerithritol, and beta-mercaptoethanol. In addition to paraoxon the phosphotriesterase was found to hydrolyze the commonly used organophosphorus insecticides, dursban, parathion, coumaphos, diazinon, fensulfothion, methyl parathion, and cyanophos." @default.
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- W1592741796 date "1989-11-01" @default.
- W1592741796 modified "2023-10-16" @default.
- W1592741796 title "Purification and Properties of the Phosphotriesterase from Pseudomonas diminuta" @default.
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- W1592741796 doi "https://doi.org/10.1016/s0021-9258(19)47164-0" @default.
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