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• W2888462572 abstract "The fungal linoleate diol synthase (LDS) family contains over twenty characterized 8-, 9-, and 10-dioxygenases (DOX), usually fused to catalytically competent cytochromes P450. Crystal structures are not available, but indirect evidence suggests that linoleic acid enters the active site of 8R-DOX-LDS headfirst and enters 9S-DOX-allene oxide synthase (AOS) with the ω-end (tail) first. Fatty acids derivatized with amino acids can conceivably be used to study oxidation in tail first position by enzymes, which bind natural fatty acids headfirst. The results might reveal catalytic similarities of homologous enzymes. 8R-DOX-5,8-LDS oxidize 18:2n-6-Ile and 18:2n-6-Gly in tail first position to 9S-hydroperoxy metabolites, albeit with less position and stereo specificity than 9S-DOX-AOS. The oxygenation mechanism of 9S-DOX-AOS with antarafacial hydrogen abstraction at C-11 and oxygen insertion at C-9 was also retained. Two homologues, 8R-DOX-7,8-LDS and 8R-DOX-AOS, oxidized 18:2n-6-Ile and 18:2n-6-Gly at C-9, suggesting a conserved feature of 8R-DOX domains. 9R-DOX-AOS, with 54% sequence identity to 9S-DOX-AOS, did not oxidize the derivatized C18 fatty acids. 9Z,12Z-16:2, two carbon shorter than 18:n-6 from the ω-end, was rapidly metabolized to an α-ketol, but 7Z,10Z-16:2 was not a substrate. An unsaturated carbon chain from C-1 to C-8 was apparently more important than the configuration at the ω-end. 8R-DOX-LDS and 9R-DOX-AOS may thus bind 18:2n-6 in the same orientation. The oxidation of 18:2n-6 in straight or reverse head-to-tail positions illustrates evolutionary traits between 8- and 9-DOX domains. Fatty acids derivatized with amino acids provide a complementary tool for the analysis of evolution of enzymes." @default.
• W2888462572 created "2018-08-31" @default.
• W2888462572 creator A5058642216 @default.
• W2888462572 date "2018-11-01" @default.
• W2888462572 modified "2023-09-24" @default.
• W2888462572 title "Polyunsaturated C18 fatty acids derivatized with Gly and Ile as an additional tool for studies of the catalytic evolution of fungal 8- and 9-dioxygenases" @default.
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• W2888462572 doi "https://doi.org/10.1016/j.bbalip.2018.08.012" @default.
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