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Substrate specificity of soybean lipoxygenase-1 (EC 1.13.11.12) was studied using as synthetic substrate analogs an entire series of (ω-6 Z,ω-9 Z)-C 13  ~ C 20  (rdienoic acids and (ω-6 Z,ω-9 Z)- C 12  ~ C 20  (i-dienols. The relative activity of lipoxygenase-1 against linoleic acid (C 18:2 COOH) was the highest among the dienoic acids and that of (6Z.9Z)-pentadecadienol (C 15:2 OH) was the highest among the dienols. Soybean lipoxygenase-1 oxygenated almost at to- 6 position of the dienoic acids independently of the chain length. With the dienols as substrate, the position of oxygenation was much influenced by the chain length. Above all, C 15:2 OH was selectively oxygenated at ω-10 rather than at ω-6 . Kinetic analyses revealed that longer and more hydrophobic dienols had higher affinity but lower velocity of oxygenation reaction. But higher velocity was obtained when smaller K m  value was observed for the dienoic acids.

Product Specificity in an Entire Series of (ω-6 Z, ω-9 Z)-C 13 ~C 20 -Dienoic Acids and -Dienols for Soybean Lipoxygenase