Catalytic activity:Arachidonate + O (2) = leukotriene A (4) + H (2) O. ,cofactor:Binds 1 iron ion per subunit. ,cofactor:Binds 2 calcium ions per subunit. ,Function:Catalyzes the first step in leukotriene biosynthesis , and thereby plays a role in inflammatory processes. ,pathway:Lipid metabolism; leukotriene A4 biosynthesis. ,PTM:Serine phosphorylation by MAPKAPK2 is stimulated by arachidonic acid. Phosphorylation on Ser-523 by PKA has an inhibitory effect. Phosphorylation on Ser-272 prevents export from the nucleus. ,similarity:Belongs to the lipoxygenase family. ,similarity:Contains 1 lipoxygenase domain. ,similarity:Contains 1 PLAT domain. ,subcellular location:Shuttles between cytoplasm and nucleus. Found exclusively in the nucleus , when phosphorylated on Ser-272. Calcium binding promotes translocation from the cytosol and the nuclear matrix to the nuclear envelope and membrane association. ,subunit:Interacts with ALOX5AP and LTC4S. ,
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