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- W2039473230 abstract "The ESR spin trapping technique was used to study the first detectable radical intermediate in the oxidation of arachidonic acid by purified prostaglandin H synthase. The holoenzyme and the apoenzyme, reconstituted with either hematin or Mn2+ protoporphyrin IX, were investigated. Depending on the different types of enzyme activity present, arachidonic acid was oxidized to at least two free radicals. One of these radicals is thought to be the first ESR detectable radical intermediate in the conversion of arachidonic acid to prostaglandin G2 and was detected previously in incubations of ram seminal vesicle microsomes, which are rich in prostaglandin H synthase. The ESR findings correlated with oxygen incorporation into arachidonic acid and prostaglandin formation, where the spin trap inhibits oxygen incorporation and prostaglandin formation by apparently competing with oxygen for the carbon-centered radical. Substitution of arachidonic acid by octadeuterated (5, 6, 8, 9, 11, 12, 14, 15)-arachidonic acid confirmed that the radical adduct contained arachidonic acid that is bound to the spin trap at one of these eight positions. An attempt was made to explain the apparent time lag between the metabolic activity observed in the oxygraph measurements and the appearance of the trapped radical signals." @default.
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- W2039473230 title "The oxidation of arachidonic acid by the cyclooxygenase activity of purified prostaglandin H synthase: Spin trapping of a carbon-centered free radical intermediate" @default.
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- W2039473230 doi "https://doi.org/10.1016/0003-9861(86)90567-9" @default.
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