Positional- and Stereo-selectivity of Fatty Acid Oxygenation Catalysed by Mouse (12S)-lipoxygenase Isoenzymes

Overview

Journal Biochem J

Specialty Biochemistry

Date 2000 May 19

PMID 10816426

Citations 24

Authors

F Burger

P Krieg

F Marks

G Furstenberger

Affiliations

Soon will be listed here.

Abstract

A quantitative stereochemical analysis of the products generated by recombinant mouse (12S)-lipoxygenase isoenzymes was performed with arachidonic acid and linoleic acid as substrates. The leucocyte-type (12S)-lipoxygenase generated, in addition to 12-hydroxyeicosatetraenoic acid (12-HETE) as the main product, 15- and 8-HETE from arachidonic acid and 13- and 9-hydroxyoctadecadienoic acid (13- and 9-HODE) from linoleic acid. The platelet-type enzyme oxygenated arachidonic acid to 12- and 8-HETE and linoleic acid to 13- and 9-HODE, whereas the epidermis-type (12S)-lipoxygenase reaction was essentially mono-specific with arachidonic acid but oxygenated linoleic acid to both 13- and 9-HODE. 12-HETE and 13-HODE were almost exclusively the S enantiomers. 8-HETE was the R enantiomer as a side-product of the platelet-type (12S)-lipoxygenase reaction but the S enantiomer as a side-product of the leucocyte-type reaction. 9-HODE was generated as the R enantiomer by the platelet-type and the epidermis-type isoenzymes and as the S enantiomer by the leucocyte-type (12S)-lipoxygenase. On the basis of published models of lipoxygenase-substrate interaction, the stereochemistry of the products generated by the platelet- and epidermis-type (12S)-lipoxygenases is in agreement with a fixed 'tail-to-head' orientation of the substrate fatty acid in the binding pocket of these enzymes, whereas that of the reaction products of the leucocyte-type (12S)-lipoxygenase can be explained only when the inverse orientation of the substrate or a rotational isomerism along the longitudinal axis of the substrate is allowed. Both the product spectra generated and the sensitivity towards the 12-lipoxygenase selective inhibitors N-benzyl-N-hydroxy-4-phenylpentanamide and cinnamyl-3,4-dihydroxy-alpha-cyanocinnamate indicated the platelet-type and the epidermis-type isoenzymes to be biochemically more related to each other than to the leucocyte-type (12S)-lipoxygenase.

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