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Feussner, I.; Balkenhohl, T. J.; Porzel, A.; Kühn, H.; Wasternack, C.; Structural Elucidation of Oxygenated Triacylglycerols in Cucumber and Sunflower Cotyledons 57-58, (1998)
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Balkenhohl, T.; Kühn, H.; Wasternack, C.; Feussner, I.; A Lipase Specific for Esterified Oxygenated Polyenoic Fatty Acids in Lipid Bodies of Cucumber Cotyledons 320-322, (1998)
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Feussner, I.; Kühn, H.; Wasternack, C.; Do Lipoxygenases Initiate β-Oxidation? 250-252, (1997) DOI: 10.1007/978-94-017-2662-7_79
The etiolated germination process of oilseed plants is characterized by the mobilization of storage lipids which serve as a major carbon source for the seedlings growth. During this stage the lipid storing organelles, the lipid bodies, are degraded and a new set of proteins, including a specific form of lipoxygenase (LOX), is detectable at their membranes in different plants [1,2]. LOXs are widely distributed in plants and animals and catalyze the regio- and stereo-specific oxygenation of polyunsaturated fatty acids [3]. The enzymatic transformations of the resulting fatty acid hydroperoxides have been extensively studied [4]. Three well characterized enzymes, a lyase, an allene oxide synthase, and a peroxygenase, were shown to degrade hydroperoxides into compounds of physiological importance, such as odors, oxylipins, and jasmonates. We have recently reported a new LOX reaction in plants where a specific LOX, the lipid body LOX, metabolizes esterified fatty acids. This reaction resulted in the formation of 13(S)-hydroxy-linoleic acid (13-HODE) and lead us to propose an additional branch of the LOX pathway: the reductase pathway. Besides a specific LOX form we suggest two additional enzyme activities, a lipid hydroperoxide reductase and a lipid hydroxide-specific lipase which lead to the formation of 13-HODE. 13-HODE might be the endogenous substrate for β-oxidation in the glyoxysomes during germination of oilseeds containing high amounts of polyunsaturated fatty acids.