Further Discussion
Figure (2) shows one pathway from EPA to DHA; for an alternative, see Sprecher's shunt.
5-LO acts at the fifth carbon from the carboxyl group. Other lipoxygenases—8-LO, 12-LO and 15-LO—make other eicosanoid-like products. To act, 5-LO uses the nuclear-membrane enzyme 5-lipoxygenase-activating protein (FLAP), first to a hydroperoxyeicosatetraenoic acid (HPETE), then to the first leuokotriene, LTA.
Read more about this topic: Essential Fatty Acid Interactions
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