Predicted to enable actin filament binding activity. Involved in myoblast fusion and regulation of myoblast fusion. Located in cytoplasm. Is expressed in several structures, including adult head; adult heart; border follicle cell; embryonic/larval esophageal visceral muscle; and muscle cell. Orthologous to human TAGLN (transgelin); TAGLN2 (transgelin 2); and TAGLN3 (transgelin 3).