Actins are highly conserved proteins that are involved in various types of cell motility and are ubiquitously expressed in all eukaryotic cells. Polymerization of globular actin (G-actin) leads to a structural filament (F-actin) in the form of a two-stranded helix (Probable). Treatments with Lantrunculin A, the microbial peptide Chondramide or the microbial metabolite Chivazole F inhibit actin polymerization (PubMed:28796488). Each actin can bind to 4 others. Interacts with YIH1 (via C-terminus); this interaction occurs in a GCN1-independent manner (PubMed:15126500, PubMed:21239490). Component of the INO80 complex. Component of the SWR1 complex. Component of the NuA4 complex. Belongs to the actin family.