Profilin is an actin monomer-binding protein, involved in the organization and reconstruction of the actin cytoskeleton in eukaryotes. Profilin at low concentrations enhances the actin polymerization, and at high concentrations it prevents it. Porfilin 1,2 and 3 are constitutive, while profilin 4 and 5 are pollen-specific. Alternative names: PRF, PFN
