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- W1536157072 abstract "The highly purified prostaglandin endoperoxide synthetase from bovine vesicular gland microsomes had two still unresolved enzyme activities; the oxygenative cyclization of 8,11,14-eicosatrienoic acid to produce prostaglandin G1 and the conversion of the 15-hydro-peroxide of prostaglandin G1 to a 15-hydroxyl group, producing prostaglandin H1. The latter enzymatic reaction required heme and was stimulated by a variety of compounds, including tryptophan, epinephrine, and guaiacol, but not by glutathione. A peroxidatic dehydrogenation was demonstrated with epinephrine or guaiacol in the presence of various hydroperoxides, including hydrogen peroxide and prostaglandin G1. Higher activity and affinity were observed with the 15-hydroperoxide of eicosapolyenoic acid, especially those with the prostaglandin structure. Both the dehydrogenation of epinephrine or guaiacol and the 15-hydroperoxide reduction of prostaglandin G1 were demonstrated in nearly stoichiometric quantities. With tryptophan, however, such a stoichiometric transformation was not observed. The peroxidase activity as followed with guaiacol and hydrogen peroxide and the tryptophan-stimulated conversion of prostaglandin G1 to H1 were not dissociable as examined by isoelectric focusing, heat treatment, pH profile, and heme specificity. The results suggest that the peroxidase with a broad substrate specificity is an integral part of prostaglandin endoperoxide synthetase which is responsible for the conversion of prostaglandin G1 to H1." @default.
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- W1536157072 date "1979-02-01" @default.
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- W1536157072 title "Prostaglandin hydroperoxidase, an integral part of prostaglandin endoperoxide synthetase from bovine vesicular gland microsomes." @default.
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- W1536157072 doi "https://doi.org/10.1016/s0021-9258(17)37880-8" @default.
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