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A direct interaction of JAM-C with the tight junction scaffold protein ZO-2
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A direct interaction of JAM-C with the tight junction scaffold protein ZO-2
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Journal Article
A direct interaction of JAM-C with the tight junction scaffold protein ZO-2
2026
Overview
Tight junctions are sites of cell-cell contacts at the apical region of epithelial junctions that are involved in barrier formation, cellular signaling, and cell-cell adhesion. Tight junctions are formed by integral membrane proteins associated with cytoplasmic scaffolding and adapter proteins through which they are linked to the underlying actomyosin and microtubule cytoskeletons. Here, we have addressed the interaction of the Junctional Adhesion Molecule (JAM)-C with the zonula adherens (ZO) protein ZO-2. Using a combination of cell-based recruitment assays and biochemical in vitro experiments, we find that JAM-C and ZO-2 directly interact in a PDZ domain-dependent manner. Notably, the interaction requires PDZ domain 3 as well as the SH3 domain of ZO-2, indicating that ZO-2 forms a functional supramodule to interact with JAM-C. We also found that JAM-C is specifically localized to tight junctions in polarized epithelial cells and that JAM-A suppresses JAM-C mRNA expression in these cells. Our findings have implications for important aspects of tight junction biology, including mechanosensing and liquid–liquid phase separation.
Publisher
Nature Publishing Group UK,Nature Publishing Group,Nature Portfolio
Subject
/ 631/57
/ 631/80
/ Adhesion
/ Animals
/ Cell Adhesion Molecules - chemistry
/ Cell Adhesion Molecules - genetics
/ Cell Adhesion Molecules - metabolism
/ Dogs
/ Epithelial Cells - metabolism
/ Humanities and Social Sciences
/ Humans
/ JAM-A
/ JAM-C
/ Kinases
/ Madin Darby Canine Kidney Cells
/ Proteins
/ Receptors, Cell Surface - genetics
/ Receptors, Cell Surface - metabolism
/ Science
/ Tight Junctions - metabolism
/ ZO-2
/ Zonula Occludens-2 Protein - chemistry
