Required for leukotriene biosynthesis by ALOX5 (5- lipoxygenase). Anchors ALOX5 to the membrane. Binds arachidonic acid, and could play an essential role in the transfer of arachidonic acid to ALOX5. Binds to MK-886, a compound that blocks the biosynthesis of leukotrienes. . This is the function of Ensembl gene identifier ENSG00000132965 (ALOX5AP, arachidonate 5-lipoxygenase activating protein).