Enables beta-catenin binding activity. Involved in several processes, including negative regulation of DNA binding activity; negative regulation of smooth muscle cell proliferation; and regulation of transcription, DNA-templated. Acts upstream of or within several processes, including branching involved in ureteric bud morphogenesis; negative regulation of Wnt signaling pathway; and negative regulation of transcription by RNA polymerase II. Predicted to be located in cytoplasm. Predicted to be part of beta-catenin destruction complex. Predicted to be active in cytosol and nucleus. Is expressed in several structures, including alimentary system; brain; genitourinary system; immune system; and respiratory system. Orthologous to human CTNNBIP1 (catenin beta interacting protein 1). [provided by Alliance of Genome Resources, Apr 2022]