Related Experiment Video
Updated: Aug 22, 2025
11:31
Analysis of Protein-protein Interactions and Co-localization Between Components of Gap, Tight, and Adherens Junctions in Murine Mammary Glands
Published on: May 30, 2017
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Pan-claudin family interactome analysis reveals shared and specific interactions
Lorena Suarez-Artiles1, Tilman Breiderhoff2, Rossana Girardello3
1Max-Delbrück Center, Berlin, Germany.
Cell Reports
|November 9, 2022
Summary
Claudins are key to epithelial tight junctions (TJs), but their full roles are unclear. This study maps claudin interactions, revealing new functions and regulation by post-translational modifications (PTMs) in epithelial cells.
Area of Science:
- Cell Biology
- Molecular Biology
- Biochemistry
Background:
- Claudins are essential transmembrane proteins forming epithelial tight junctions (TJs).
- Their precise roles in TJ formation and non-TJ functions, particularly involving the C-terminal tail, remain incompletely understood.
- Understanding claudin interactions is crucial for deciphering epithelial barrier function and cell polarity.
Purpose of the Study:
- To comprehensively map the interactome of the pan-claudin family in Madin-Darby canine kidney (MDCK)-C7 cells.
- To investigate the functions of claudin C-terminal tails beyond interactions with known TJ-associated proteins like TJ protein ZO-1 (TJP1).
- To identify potential roles of claudins in localized cellular processes and their regulation by post-translational modifications (PTMs).
Main Methods:
- Utilized two complementary mass spectrometry-based pull-down techniques.
- Performed an interactome study on the entire claudin family in MDCK-C7 cells.
- Analyzed interaction partners of claudin C termini.
Main Results:
- Generated a detailed interaction landscape for the pan-claudin family.
- Identified novel interaction partners for claudin C termini.
- Revealed potential implications of these interactions in localized biological processes within epithelial cells.
- Highlighted the role of post-translational modifications (PTMs) in regulating claudin interactions and functions.
Conclusions:
- The study provides a comprehensive interactome map of the claudin family.
- Claudin C-terminal interactions suggest roles in specific cellular processes beyond tight junction formation.
- Post-translational modifications (PTMs) are important regulators of claudin interactions and functions in epithelial cells.
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