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• W2079006586 abstract "Compound I of peroxidases takes part in both the peroxidation and the halogenation reaction. This study for the first time presents transient kinetic measurements of the formation of compound I of human eosinophil peroxidase (EPO) and its reaction with halides and thiocyanate, using the sequential-mixing stopped-flow technique. Addition of 1 equiv of hydrogen peroxide to native EPO leads to complete formation of compound I. At pH 7 and 15 °C, the apparent second-order rate constant is (4.3 ± 0.4) × 107 M-1 s-1. The rate for compound I formation by hypochlorous acid is (5.6 ± 0.7) × 107 M-1 s-1. EPO compound I is unstable and decays to a stable intermediate with a compound II-like spectrum. At pH 7, the two-electron reduction of compound I to the native enzyme by thiocyanate has a second-order rate constant of (1.0 ± 0.5) × 108 M-1 s-1. Iodide [(9.3 ± 0.7) × 107 M-1 s-1] is shown to be a better electron donor than bromide [(1.9 ± 0.1) × 107 M-1 s-1], whereas chloride oxidation by EPO compound I is extremely slow [(3.1 ± 0.3) × 103 M-1 s-1]. The pH dependence studies suggest that a protonated form of compound I is more competent in oxidizing the anions. The results are discussed in comparison with those of the homologous peroxidases myeloperoxidase and lactoperoxidase and with respect to the role of EPO in host defense and tissue injury." @default.
• W2079006586 created "2016-06-24" @default.
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• W2079006586 date "2000-11-22" @default.
• W2079006586 modified "2023-10-04" @default.
• W2079006586 title "Spectral and Kinetic Studies on the Formation of Eosinophil Peroxidase Compound I and Its Reaction with Halides and Thiocyanate^†" @default.
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• W2079006586 doi "https://doi.org/10.1021/bi0020271" @default.
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