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• W1870045856 abstract "Paraoxonase (paraoxon hydrolase), an enzyme that hydrolyses paraoxon (O,O-diethyl O-p-nitrophenyl phosphate), is located in mammals primarily in the serum and liver. Although considerable information is available regarding serum paraoxonase, little is known about the hepatic form of this enzyme. The present work represents the first study on the purification of rat liver paraoxonase. This enzyme has been purified 415-fold to apparent homogeneity with a final specific activity of 1370 units/mg using a protocol consisting of five steps: solubilization of the microsomal fraction, hydroxyapatite adsorption, chromatography on DEAE-Sepharose CL-6B, non-specific affinity chromatography on Cibacron Blue 3GA and anion exchange on Mono Q HR 5/5. The presence of Ca2+ and Triton X-100 in the buffers throughout the purification procedure was essential for maintaining enzyme activity. SDS/PAGE of the final preparation indicated a single protein-staining band with an apparent Mr of 45000. N-terminal and internal amino acid sequences were determined and compared with those of paraoxonases from human and rabbit serum and mouse liver, showing a high similarity. The pH profile showed optimum activity at pH 8.5. The pH stability and heat inactivation of the enzyme were also studied. The Km for liver paraoxonase was 1.69 mM." @default.
• W1870045856 created "2016-06-24" @default.
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• W1870045856 date "1997-02-01" @default.
• W1870045856 modified "2023-10-12" @default.
• W1870045856 title "Purification and characterization of paraoxon hydrolase from rat liver" @default.
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• W1870045856 doi "https://doi.org/10.1042/bj3210595" @default.
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