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 binding to PIP2, it inhibits the formation of IP3 and DG. Occurs in many kinds of cells as a complex with monomeric actin in a 1:1 ratio. Several isoforms of the allergen exist due to polymorphism. Causes an allergic reaction in human. The variability of the residues taking part of IgE-binding epitopes might be responsible of the difference in cross-reactivity among olive pollen cultivars, and between distantly related pollen species, leading to a variable range of allergy reactions among atopic patients. Belongs to the profilin family.