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. Has a high affinity for poly-proline. Actin binding is enhanced by calcium Ca(2+). Multimer (PubMed:27586352). Occurs in many kinds of cells as a complex with monomeric actin in a 1:1 ratio (By similarity). Expressed in vegetative tissues. Present in shoots, roots and coleoptiles. Also detected in endosperm and pollen. Phosphorylated by MAP kinases. Several isoforms of the allergen exist due to polymorphism. Causes an allergic reaction in human (Probable). Dimerization considerably increases the IgE-mediated degranulation in rat basophilic leukemia cells (PubMed:27586352). Belongs to the profilin family.