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Sci Signal. 2014 Dec 2;7(354):rs7. doi: 10.1126/scisignal.2005473.

E-cadherin interactome complexity and robustness resolved by quantitative proteomics.

Author information

1
Mechanobiology Institute of Singapore, National University of Singapore, Singapore 117411, Singapore.
2
Vascular Proteomics Laboratory, Cancer Research UK Beatson Institute, Glasgow G61 1BD, UK.
3
Departments of Biochemistry and Molecular Biophysics and Systems Biology, and Center of Computational Biology and Bioinformatics, Columbia University, New York, NY 10032, USA.
4
Mechanobiology Institute of Singapore, National University of Singapore, Singapore 117411, Singapore. Department of Biomedical Engineering, National University of Singapore, Singapore 117575, Singapore. biezbr@nus.edu.sg.

Abstract

E-cadherin-mediated cell-cell adhesion and signaling plays an essential role in development and maintenance of healthy epithelial tissues. Adhesiveness mediated by E-cadherin is conferred by its extracellular cadherin domains and is regulated by an assembly of intracellular adaptors and enzymes associated with its cytoplasmic tail. We used proximity biotinylation and quantitative proteomics to identify 561 proteins in the vicinity of the cytoplasmic tail of E-cadherin. In addition, we used proteomics to identify proteins associated with E-cadherin-containing adhesion plaques from a cell-glass interface, which enabled the assignment of cellular localization to putative E-cadherin-interacting proteins. Moreover, by tagging identified proteins with GFP (green fluorescent protein), we determined the subcellular localization of 83 putative E-cadherin-proximal proteins and identified 24 proteins that were previously uncharacterized as part of adherens junctions. We constructed and characterized a comprehensive E-cadherin interaction network of 79 published and 394 previously uncharacterized proteins using a structure-informed database of protein-protein interactions. Finally, we found that calcium chelation, which disrupts the interaction of the extracellular E-cadherin domains, did not disrupt most intracellular protein interactions with E-cadherin, suggesting that the E-cadherin intracellular interactome is predominantly independent of cell-cell adhesion.

PMID:
25468996
PMCID:
PMC4972397
DOI:
10.1126/scisignal.2005473
[Indexed for MEDLINE]
Free PMC Article

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