Non-heme iron-containing dioxygenase that catalyzes the stereo-specific peroxidation of free and esterified polyunsaturated fatty acids generating a spectrum of bioactive lipid mediators. Catalyzes the peroxidation of arachidonate and linoleate into (8S)-HPETE and (9S)-HPODE respectively. From arachidonate mainly produces (8S)-HPETE and in addition, minor products derived from (8S)-HPETE itself that may include leukotriene A4 and 8,15-diHPETE. With arachidonate as substrate, has no detectable 15S-lipoxygenase activity and only displays a 8S-lipoxygenase activity. However, it may have a 15S-lipoxygenase activity with (8S)-HPETE to produce (8S,15S)-diHPETE. May also catalyze (15S)-HPETE peroxidation to produce 8,15-diHPETE. May play a role in keratinocyte differentiation through activation of the peroxisome proliferator activated receptor signaling pathway.
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ALOX15B: Converts arachidonic acid exclusively to 15S- hydroperoxyeicosatetraenoic acid, while linoleic acid is less well metabolized. Belongs to the lipoxygenase family. 4 isoforms of the human protein are produced by alternative splicing.
Protein type: Apoptosis; Cell cycle regulation; EC 18.104.22.168; Lipid Metabolism - arachidonic acid; Motility/polarity/chemotaxis; Oxidoreductase
Cellular Component: cytoplasm; cytoskeleton; cytosol; extrinsic to membrane; intracellular; membrane; plasma membrane
Molecular Function: arachidonate 15-lipoxygenase activity; calcium ion binding; iron ion binding; lipoxygenase activity
Biological Process: arachidonic acid metabolic process; hepoxilin biosynthetic process; linoleic acid metabolic process; lipoxygenase pathway; negative regulation of cell cycle; negative regulation of cell proliferation; negative regulation of growth; positive regulation of keratinocyte differentiation
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