Binds to actin and affects the structure of the cytoskeleton. At high concentrations, profilin prevents the polymerization of actin, whereas it enhances it at low concentrations (By similarity). Occurs in many kinds of cells as a complex with monomeric actin in a 1:1 ratio. Phosphorylated by MAP kinases. Several isoforms of the allergen exist due to polymorphism. Causes an allergic reaction in human. Belongs to the profilin family.