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• W2011370051 abstract "Spectral scans in both the visible (650-450 nm) and the Soret (450-380 nm) regions were recorded for the native enzyme, Compound II, and Compound III of lactoperoxidase and thyroid peroxidase. Compound II for each enzyme (1.7 μm) was prepared by adding a slight excess of H2O2 (6 μm), whereas Compound III was prepared by adding a large excess of H2O2 (200 μm). After these compounds had been formed it was observed that they were slowly reconverted to the native enzyme in the absence of exogenous donors. The pathway of Compound III back to the native enzyme involved Compound II as an intermediate. Reconversion of Compound III to native enzyme was accompanied by the disappearance of H2O2 and generation of O2, with approximately 1 mol of O2 formed for each 2 mol of H2O2 that disappeared. A scheme is proposed to explain these observations, involving intermediate formation of the ferrous enzyme. According to the scheme, Compound III participates in a reaction cycle that effectively converts H2O2 to O2. Iodide markedly affected the interconversions between native enzyme, Compound II, and Compound III for lactoperoxidase and thyroid peroxidase. A low concentration of iodide (4 μm) completely blocked the formation of Compound II when lactoperoxidase or thyroid peroxidase was treated with 6 μm H2O2. When the enzymes were treated with 200 μm H2O2, the same low concentration of iodide completely blocked the formation of Compound III and largely prevented the enzyme degradation that otherwise occurred in the absence of iodide. These effects of iodide are readily explained by (i) the two-electron oxidation of iodide to hypoiodite by Compound I, which bypasses Compound II as an intermediate, and (ii) the rapid oxidation of H2O2 to O2 by the hypoiodite formed in the reaction between Compound I and iodide." @default.
• W2011370051 created "2016-06-24" @default.
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• W2011370051 date "1988-08-01" @default.
• W2011370051 modified "2023-10-17" @default.
• W2011370051 title "Spectral studies with lactoperoxidase and thyroid peroxidase: Interconversions between native enzyme, Compound II, and Compound III" @default.
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• W2011370051 doi "https://doi.org/10.1016/0003-9861(88)90309-8" @default.
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