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- W1498049218 abstract "Hepatic microsomal heme oxygenase was solubilized, partially purified, and characterized from Co2+-treated rats. The enzyme on sodium dodecyl sulfate-polyacrylamide gel electrophoresis exhibited a minimum molecular weight of greater than or equal to 68,000. The solubilized enzyme was totally devoid of contamination with cytochrome P-450 or b5. The requirement for reduced pyridine nucleotides was absolute, and ascorbate could not support heme oxidative activity. However, both TPNH and DPNH could serve as electron donors, with TPNH being more effective. The presence of an appropriate flavoprotein reductase was essential for heme oxidation. The enzyme had an apparent Km of 40 micrometer, a pH optimum of 7.5, and lost substantial activity upon freezing and thawing. Methemoglobin was 30% as effective a substrate for the enzyme as was heme. Free porphyrins could not serve as substrates for the enzyme. The activity of the enzyme was inhibited by HgCl2, p-chloromercuribenzoate, iodoacetamide, mercaptoethanol, and dithiothrietol indicating that free -SH group(s) is necessary for enzyme activity." @default.
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- W1498049218 date "1977-08-01" @default.
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- W1498049218 title "Solubilization and partial purification of heme oxygenase from rat liver." @default.
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- W1498049218 doi "https://doi.org/10.1016/s0021-9258(17)40109-8" @default.
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