Abstract
β-Catenin is an intracellular multifunctional protein. In complex with the transmembrane adhesive receptor E-cadherin, it becomes plasma membrane-associated and mediates intercellular adhesion. A cytosolic pool of β-catenin interacts with DNA-binding proteins and participates in signal transduction. To reveal the possible cross-talk between these two pools, we studied whether β-catenin is exchanged between its free and cadherin-bound states. We found that pulse-labeled β-catenin replaces the β-catenin bound to the cell surface prebiotinylated E-cadherin immediately after synthesis. Approximately 25% of all pulse-labeled β-catenin destined for E-cadherin associates with this protein via this mechanism. The rest of the newly synthesized β-catenin arrives at the plasma membrane in a complex with the E-cadherin precursor. Immediately after arrival, this β-catenin pool is transferred to the prebiotinylated E-cadherin. β-Catenin released from E-cadherin may participate in new exchange cycles. This β-catenin exchange is strongly affected in cells that contain mutations in the tumor suppressor gene APC. This process may contribute significantly to both cell–cell adhesion and β-catenin-dependent signaling.
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Acknowledgements
We thank Drs A Eizen (Washington University, St Louis, MO, USA), A Ljubimov (Cedars-Sinai Medical Center, Los Angeles, CA, USA), and N Gloushankova (Russian Cancer Research Center, Moscow, Russia) for valuable discussions. This work has been supported by National Institutes of Health Grants AR44016-04 and AR45254-01.
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Klingelhöfer, J., Troyanovsky, R., Laur, O. et al. Exchange of catenins in cadherin–catenin complex. Oncogene 22, 1181–1188 (2003). https://doi.org/10.1038/sj.onc.1206245
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DOI: https://doi.org/10.1038/sj.onc.1206245
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