Actins are highly conserved proteins that are involved in various types of cell motility and are ubiquitously expressed in all eukaryotic cells. Multiple isoforms are involved in various cellular functions such as cytoskeleton structure, cell mobility, chromosome movement and muscle contraction. Component of the Tip60 chromatin-remodeling complex which contains the catalytic subunit Tip60 and the subunits Domino, Tra1, Brd8, E(Pc), DMAP1, Pontin, Reptin, Ing3, Act87E, BAP55, Mrg15, MrgBP, Gas41 and YL-1. Oxidation of Met-45 by Mical to form methionine sulfoxide promotes actin filament depolymerization. Methionine sulfoxide is produced stereospecifically, but it is not known whether the (S)-S-oxide or the (R)-S-oxide is produced. In Drosophila there are 6 closely related actin genes. Belongs to the actin family.