Abstract
β-Catenin and plakoglobin are closely related armadillo family proteins with shared and distinct properties; Both are associated with cadherins in actin-containing adherens junctions. Plakoglobin is also found in desmosomes where it anchors intermediate filaments to the desmosomal plaques. β-Catenin, on the other hand, is a component of the Wnt signaling pathway, which is involved in embryonic morphogenesis and tumorigenesis. A key step in the regulation of this pathway involves modulation of β-catenin stability. A multiprotein complex, regulated by Wnt, directs the phosphorylation of β-catenin and its degradation by the ubiquitin-proteasome system. Plakoglobin can also associate with members of this complex, but inhibition of proteasomal degradation has little effect on its levels while dramatically increasing the levels of β-catenin. β-TrCP, an F-box protein of the SCF E3 ubiquitin ligase complex, was recently shown to play a role in the turnover of β-catenin. To elucidate the basis for the apparent differences in the turnover of β-catenin and plakoglobin we compared the handling of these two proteins by the ubiquitin-proteasome system. We show here that a deletion mutant of β-TrCP, lacking the F-box, can stabilize the endogenous β-catenin leading to its nuclear translocation and induction of β-catenin/LEF-1-directed transcription, without affecting the levels of plakoglobin. However, when plakoglobin was overexpressed, it readily associated with β-TrCP, efficiently competed with β-catenin for binding to β-TrCP and became polyubiquitinated. Fractionation studies revealed that about 85% of plakoglobin in 293 cells, is Triton X-100-insoluble compared to 50% of β-catenin. These results suggest that while both plakoglobin and β-catenin can comparably interact with β-TrCP and the ubiquitination system, the sequestration of plakoglobin by the membrane-cytoskeleton system renders it inaccessible to the proteolytic machinery and stabilizes it.
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Acknowledgements
This study was supported by grants from the German-Israeli Foundation for Scientific Research and Development (A Ben-Ze'ev) the Cooperation Program in Cancer Research between DKFZ and IMOSA (A Ben-Ze'ev and B Geiger), by the Yad Abraham Center for Cancer Diagnosis and Therapy and the Minerva Foundation (B Geiger). A Ben-Ze'ev holds the Lunenfeld-Kunin Chair in Cell Biology and Genetics. B Geiger. Is the incumbent of the Erwin Neter chair in Cell and Tumor Biology.
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Sadot, E., Simcha, I., Iwai, K. et al. Differential interaction of plakoglobin and β-catenin with the ubiquitin-proteasome system. Oncogene 19, 1992–2001 (2000). https://doi.org/10.1038/sj.onc.1203519
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DOI: https://doi.org/10.1038/sj.onc.1203519
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