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Metabolism and Enzymology

Properties of a Lipoxygenase in Green Algae (Oscillatoria sp.)

Laboratoire de Biochimie, Faculté de Pharmacie, 2, rue du Docteur Marcland, 87025 Limoges Cédex, France

A lipoxygenase preparation was obtained from green algae Oscillatoria sp. and was shown to differ from previous described lipoxygenases in the positional specificity and pH characteristics of the dioxygenation reaction. The enzyme had a pH optimum at 8.8 and was inactive at pH 6. Oscillatoria lipoxygenase converted linoleic acid into two products: 13-hydroperoxylinoleic acid (52%) and 9-hydroperoxylinoleic acid (48%). The molecular weight of the enzyme was estimated at 124,000. Esculetin was found to be the best inhibitor of the enzyme activity.