Enables nuclear import signal receptor activity. Acts upstream of or within several processes, including entry of viral genome into host nucleus through nuclear pore complex via importin; positive regulation of macromolecule metabolic process; and protein import into nucleus. Predicted to be located in cytoplasm. Predicted to be active in nucleoplasm. Is expressed in several structures, including heart; liver; lung; oocyte; and spleen. Orthologous to human KPNA6 (karyopherin subunit alpha 6). [provided by Alliance of Genome Resources, Apr 2022]