Recruits CKI-epsilon to the beta-catenin degradation complex that consists of AXN1 or AXN2 and GSK3-beta and allows efficient phosphorylation of beta-catenin, thereby inhibiting beta-catenin/Tcf signals. Interacts with AXN1, AXN2 and CSNK1E/CKI-epsilon. Extended N-terminus.