Lipoxygenase that metabolizes linoleic and alpha-linolenic acids to 11S- and 13R-hydroperoxy fatty acids. At the end of lipoxygenation, the intermediate product 11S-HPODE from linoleic acid is then transformed into 13R-HPODE as the final product. It also acts on alpha-linolenic acid producing 11S-HPOTrE and 13R-HPOTrE with subsequent transformation of 11S-HPOTrE to 13R-HPOTrE as the final product. Gamma-linolenic acid is a poor substrate. Oleate and arachidonate are not substrates. (9Z,12Z)-octadecadienoate + O2 = (11S)-hydroperoxy-(9Z,12Z)-octadecadienoate (9Z,12Z)-octadecadienoate + O2 = (13R)-hydroperoxy-(9Z,11E)-octadecadienoate (9Z,12Z,15Z)-octadecatrienoate + O2 = (11S)-hydroperoxy-(9Z,12Z,15Z)-octadecatrienoate (9Z,12Z,15Z)-octadecatrienoate + O2 = (13R)-hydroperoxy-(9Z,11E,15Z)-octadecatrienoate Optimum pH is 7. Active from pH 5 to pH 11. Optimum temperature is 60 degrees Celsius. Enzyme activity decreases sharply above 63 degrees Celsius. N- and O-glycosylated. Belongs to the lipoxygenase family.