Actins are highly conserved proteins that are involved in various types of cell motility and are ubiquitously expressed in all eukaryotic cells. Essential component of cell cytoskeleton; plays an important role in cytoplasmic streaming, cell shape determination, cell division, organelle movement and extension growth. This is considered as one of the reproductive actins. Polymerization of globular actin (G-actin) leads to a structural filament (F-actin) in the form of a two-stranded helix. The binding of profilin to monomeric G-actin cause the sequestration of actin into profilactin complexes, and prevents the polymerization. Displays particular expression in the root cap and pericycle tissues associated with lateral root development. Little or no reproductive-gene expression is detected in vegetative organs, such as stems, leaves, sepals and petals. Expressed primarily in pollen. There are 8 actin genes in A.thaliana. Belongs to the actin family.