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Biological Chemistry

Editor-in-Chief: Brüne, Bernhard

Editorial Board: Buchner, Johannes / Lei, Ming / Ludwig, Stephan / Thomas, Douglas D. / Turk, Boris / Wittinghofer, Alfred

IMPACT FACTOR 2018: 3.014
5-year IMPACT FACTOR: 3.162

CiteScore 2018: 3.09

SCImago Journal Rank (SJR) 2018: 1.482
Source Normalized Impact per Paper (SNIP) 2018: 0.820

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Volume 383, Issue 3-4


The Specificity of Lipoxygenase-Catalyzed Lipid Peroxidation and the Effects of Radical- Scavenging Antioxidants

N. Noguchi / H. Yamashita / J. Hamahara / A. Nakamura / H. Kühn / E. Niki
Published Online: 2005-06-01 | DOI: https://doi.org/10.1515/BC.2002.064


The oxidation of low density lipoprotein (LDL) by lipoxygenase has been implicated in the pathogenesis of atherosclerosis. It has been known that lipoxygenasemediated lipid peroxidation proceeds in general via regio, stereo and enantiospecific mechanisms, but that it is sometimes accompanied by a share of random hydroperoxides as side reaction products. In this study we investigated the oxidation of various substrates (linoleic acid, methyl linoleate, phosphatidylcholine, isolated LDL, and human plasma) by the arachidonate 15-lipoxygenases from rabbit reticulocytes and soybeans aiming at elucidating the effects of substrate, lipoxygenase and reaction milieu on the contribution and mechanism of random oxidation and also the effect of antioxidant. The specific character of the rabbit 15-lipoxygenase reaction was confirmed under all conditions employed here. However, the specificity by soybean lipoxygenase was markedly dependent on the conditions. When phosphatidylcholine liposomes and LDL were oxygenated by soybean lipoxygenase, the product pattern was found to be exclusively regio, stereo, and enantiorandom. When free linoleic acid was incorporated into PC liposomes and oxidized by soybean lipoxygenase, the free acid was specifically oxygenated, whereas esterified linoleate gave random oxidation products exclusively. Radicalscavenging antioxidants such as αtocopherol, ascorbic acid and 2-carboxy-2,5,7,8-tetramethyl-6-chromanol selectively inhibited the random oxidation but did not influence specific product formation. It is assumed that the random reaction products originate from free radical intermediates, which have escaped the active site of the enzyme and thus may be accessible to radical scavengers. These data indicate that the specificity of lipoxygenasecatalyzed lipid oxidation and the inhibitory effects of antioxidants depend on the physicochemical state of the substrate and type of lipoxygenase and that they may change completely depending on the conditions.

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Published Online: 2005-06-01

Published in Print: 2002-04-12

Citation Information: Biological Chemistry, Volume 383, Issue 3-4, Pages 619–626, ISSN (Print) 1431-6730, DOI: https://doi.org/10.1515/BC.2002.064.

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