Myosins are actin-based motor molecules with ATPase activity. Unconventional myosins serve in intracellular movements. Their highly divergent tails are presumed to bind to membranous compartments, which would be moved relative to actin filaments (By similarity). Tightly associated with the plasma membrane. This protein differs from the typical myosin heavy chain structure in having head and tail domains but no discernible neck domain. Belongs to the TRAFAC class myosin-kinesin ATPase superfamily. Myosin family.