Immunoprecipitation and ubiquitination evaluation were performed as previously described32 (link). In brief, cells were treated with MG132 (Abcam) at a final concentration of 20 μm for 4 h before collection. Whole-cell lysates were prepared in RIPA buffer and precipitated using protein A/G beads (Abmart) with β-Catenin antibody (Abmart). Precipitated products were assayed by immunoblot (IB) analysis with anti-Ub antibody (Abcam) or β-Catenin antibody.
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