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• W1929067551 endingPage "22362" @default.
• W1929067551 startingPage "22357" @default.
• W1929067551 abstract "A rat heme oxygenase (HO-1) gene without the sequence coding for the last 23 amino acids has been constructed and expressed behind the pho A promoter in Escherichia coli. The enzyme is expressed at high levels as a soluble catalytically active protein that causes the bacterial cells to accumulate biliverdin. The purified truncated heme-heme oxygenase complex is spectroscopically indistinguishable from the complex with the native enzyme and converts heme to biliverdin when reconstituted with rat liver cytochrome P450 reductase. Reaction of the recombinant heme-heme oxygenase complex with H2O2 produces a species with the spectroscopic properties of verdoheme. Unidentified products are obtained when this intermediate is directly extracted from the protein, but biliverdin is obtained if the verdoheme-protein complex is exposed to cytochrome P450 reductase and NADPH before the extraction step. In contrast, reaction of the heme-heme oxygenase complex with meta-chloroperbenzoic acid (mCPBA), tert-butylhydroperoxide, or cumene hydroperoxide yields a ferryl (FeIV = O) complex. Reaction of the heme-heme oxygenase complex with mCPBA also produces an EPR-detectable protein radical. In accord with formation of a ferryl intermediate, recombinant heme oxygenase catalyzes the mCPBA- and alkylhydroperoxide-dependent peroxidation of 2-methoxyphenol (guaiacol). Guaiacol oxidation is not observed during turnover of the enzyme by cytochrome P450 reductase/NADPH or H2O2. Conversely, biliverdin is not formed with tert-butylhydroperoxide or mCPBA. H2O2 thus supports the first step of the normal catalytic oxidation of heme by heme oxygenase, but alkyl and acyl hydroperoxides do not. These results suggest that the alpha-meso-hydroxylation required for biliverdin formation is mediated by the distal of the two oxygens in the iron-dioxygen intermediate (Fe-O-O) engendered by reaction with either cytochrome P450 reductase/NADPH or H2O2." @default.
• W1929067551 created "2016-06-24" @default.
• W1929067551 creator A5003621282 @default.
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• W1929067551 date "1993-10-01" @default.
• W1929067551 modified "2023-10-17" @default.
• W1929067551 title "Rat liver heme oxygenase. High level expression of a truncated soluble form and nature of the meso-hydroxylating species." @default.
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• W1929067551 doi "https://doi.org/10.1016/s0021-9258(18)41536-0" @default.
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