May have a structural role to stabilize the lipid body during desiccation of the seed by preventing coalescence of the oil. Probably interacts with both lipid and phospholipid moieties of lipid bodies. May also provide recognition signals for specific lipase anchorage in lipolysis during seedling growth. Homodimer. Forms oligomers. Surface of oil bodies. Oleosins exist at a monolayer lipid/water interface. Expressed in seeds (at protein level) (PubMed:16095908, PubMed:25860789, PubMed:12144563). Not expressed in leaves (PubMed:16095908). Expressed in immature (78 days post-seedling) and mature seeds. Causes an allergic reaction in human (PubMed:25860789, PubMed:12144563). Pooled with Ara h 15 binds to IgE in 75% of the 4 peanut-allergic patients tested (PubMed:25860789). Binds to IgE in 36% of the 14 peanut allergic-patients tested. IgE-binding is increased in roasted peanuts compared to fresh peanuts (PubMed:12144563). Belongs to the oleosin family.