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• W2049391034 startingPage "6880" @default.
• W2049391034 abstract "Lipoxygenase, a nonheme iron dioxygenase, catalyzes the oxygenation of 1,4-diene units in polyunsaturated fatty acids, forming conjugated diene hydroperoxides as the primary products. The naturally occurring all-Z geometry for the olefins in the polyunsaturated fatty acid has long been thought to be a substrate requirement for the enzyme. A rigorous test of this hypothesis using the two isomeric (9E,12Z)- and (9Z,12E)-9,12-octadecadienoic acids was carried out. Both isomeric substrates were found to be catalytically oxygenated by soybean lipoxygenase 1 at a significant fraction of the rate of the reaction of the natural substrate, linoleic acid. Product determinations revealed that a thermodynamically unfavorable E to Z isomerization at the 9,10-position occurred when (9E,12Z)-9,12-octadecadienoic acid was converted into the 13-hydroperoxide by lipoxygenase 1. Determination of the stereochemistry at the oxygenated position in the products indicated that a comparable isomerization at the 12,13-position did not occur when the 9Z,12E isomer was employed. The distribution of products obtained from oxygenation at the 9-position supported the hypothesis that the enzyme catalyzes the reaction in one of two substrate orientations, conventional and head to tail reversed. The observations can be understood on the basis of the steric demands on intermediates in the proposed mechanism of action as well as by catalysis by the active-site iron atom." @default.
• W2049391034 created "2016-06-24" @default.
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• W2049391034 date "1987-10-01" @default.
• W2049391034 modified "2023-10-04" @default.
• W2049391034 title "Oxygenation of trans polyunsaturated fatty acids by lipoxygenase reveals steric features of the catalytic mechanism" @default.
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• W2049391034 doi "https://doi.org/10.1021/bi00395a043" @default.
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