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. Occurs in many kinds of cells as a complex with monomeric actin in a 1:1 ratio. Expressed in pollen (at protein and mRNA level). Causes an allergic reaction in human. Binds to IgE in 29% of the 165 Spanish patients tested allergic to S.kali and/or C.album pollen. Belongs to the profilin family.