Key regulator of cell-cell adhesion that associates with and regulates the cell adhesion properties of both C-, E- and N-cadherins, being critical for their surface stability. Beside cell-cell adhesion, regulates gene transcription through several transcription factors including ZBTB33/Kaiso2 and GLIS2, and the activity of Rho family GTPases and downstream cytoskeletal dynamics. Implicated both in cell transformation by SRC and in ligand-induced receptor signaling through the EGF, PDGF, CSF-1 and ERBB2 receptors. Belongs to a multiprotein cell-cell adhesion complex that also contains E-cadherin/CDH1, alpha-catenin/CTNNA1, beta-catenin/CTNNB1, and gamma-catenin/JUP. Binds to the C-terminal fragment of PSEN1 and mutually competes for CDH1 (By similarity). Interacts with ZBTB33 (PubMed:10207085, PubMed:12087177). Interacts with GLIS2 (PubMed:17344476). Interacts with FER (By similarity). Interacts with NANOS1 (via N-terminal region) (By similarity). Interacts (via N-terminus) with GNA12; the interaction regulates CDH1-mediated cell-cell adhesion (PubMed:15240885). Interacts with GNA13 (PubMed:15240885). Component of a cadherin:catenin adhesion complex composed of at least of CDH26, beta-catenin/CTNNB1, alpha-catenin/CTNNA1 and p120 catenin/CTNND1 (By similarity). Interacts with CCDC85B (By similarity). Interacts with PLPP3; negatively regulates the PLPP3-mediated stabilization of CTNNB1 (By similarity). Interaction with GLIS2 promotes nuclear translocation (PubMed:17344476). Detected at cell-cell contacts (By similarity). NANOS1 induces its translocation from sites of cell-cell contact to the cytoplasm (By similarity). CDH1 enhances cell membrane localization (By similarity). Expressed in basal keratinocytes (at protein level). Expressed at the outer limiting membrane of the retina at 18.5 dpc. ARM repeats 1 to 5 mediate interaction with cadherins. Phosphorylated by FER and other protein-tyrosine kinases. Phosphorylated at Ser-288 by PAK5. Dephosphorylated by PTPRJ (By similarity). Belongs to the beta-catenin family. Extended N-terminus.