Enables actin filament binding activity and identical protein binding activity. Involved in negative regulation of protein localization to nucleus. Acts upstream of or within several processes, including apical junction assembly; negative regulation of neuroblast proliferation; and regulation of signal transduction. Located in several cellular components, including intercalated disc; lamellipodium; and zonula adherens. Part of flotillin complex. Is expressed in several structures, including alimentary system; brain; genitourinary system; respiratory system; and sensory organ. Used to study patterned macular dystrophy 2. Human ortholog(s) of this gene implicated in patterned macular dystrophy 2. Orthologous to human CTNNA1 (catenin alpha 1). [provided by Alliance of Genome Resources, Apr 2022]