Sequence of a cDNA Clone Encoding a Potato (Solanum tuberosum) Tuber Lipoxygenase

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Abstract
LOX (EC 1.13.11.12) are ubiquitous plant enzymes that catalyze the hydroperoxidation of polyunsaturated fatty acids; potato tubers contain high levels of LOX (Pinsky et al., 1971). LOX are believed to catalyze a key step in the formation of jasmonates, which have profound effects on plant physiology and gene expression (Staswick, 1992), including the induction of tuber formation in potatoes (Koda et al., 1991). LOX have also been implicated in the arachidonic acid-elicited hypersensitive cell death response of potato discs and callus lines (Bostock et al., 1992; Vaughn and Lulai, 1992). The potato tuber LOX that has been purified effects hydroperoxidation predominantly at the 5-carbon of arachidonic acid (Shimizu et al., 1990) and thus differs in positional specificity from the well-characterized soybean seed arachidonate 15-LOX (Boyington et al., 1993); analysis of its structure may afford clues to the basis of positional specificity of hydroperoxidation by plant LOX. This report describes loxl:St:Z, a Solanum tuberosum LOX

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