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Tight Junctions

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Tight junctions are molecular seals between cells that prevent the leaking of fluids, ions, and other small solutes across cavities and compartments in multicellular organisms. They are mainly composed of claudin and occludin transmembrane proteins, and other proteins such as tricellulin and JAM (junctional adhesion molecule). All these proteins are 4-pass transmembrane proteins, except JAM, which is a single-pass transmembrane protein belonging to the immunoglobulin superfamily. The...

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Related Experiment Video

Updated: May 1, 2026

In Vitro Analysis of PDZ-dependent CFTR Macromolecular Signaling Complexes

In Vitro Analysis of PDZ-dependent CFTR Macromolecular Signaling Complexes

Published on: August 13, 2012

A complex affair: Attraction and repulsion make occludin and ZO-1 function!

Maria C Bewley¹, Brian R Tash², Fang Tian¹

¹Department of Biochemistry and Molecular Biology; Pennsylvania State University College of Medicine; Hershey, PA USA.

Tissue Barriers

|March 26, 2014

Summary

Tight junctions (TJs) regulate cell barriers and signaling. This study investigates how ZO-1 protein regions control TJ assembly, potentially impacting diseases like cancer and diabetic retinopathy.

Keywords:

occludin phosphorylation structure zonula occludens

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Area of Science:

Cell biology
Molecular biology
Biochemistry

Background:

Tight junctions (TJs) are crucial protein complexes regulating paracellular transport and cellular signaling.
While initially recognized for their barrier function, TJs are now known to be involved in differentiation and proliferation.
Dysregulation of TJs is implicated in various diseases, including cancers and diabetic retinopathy.

Purpose of the Study:

To investigate the role of specific regions within the ZO-1 protein in regulating tight junction assembly and disassembly.
To explore the hypothesis that U5 and U6 regions of ZO-1 mediate phosphorylation-dependent interactions similar to those observed in occludin.

Main Methods:

The study focuses on the structural characterization of the ZO-1:occludin interaction.
Analysis of specific regions within ZO-1, namely U5 and U6, for their role in TJ dynamics.
Investigating phosphorylation-dependent mechanisms controlling TJ association and disassociation.

Main Results:

Recent studies have elucidated the structural basis of the ZO-1:occludin interaction.
Specific regions on occludin have been identified that govern TJ association/disassociation in a phosphorylation-dependent manner.
The study hypothesizes similar phosphorylation-dependent regulatory roles for U5 and U6 regions within ZO-1.

Conclusions:

ZO proteins and occludin act as key regulators of tight junction dynamics.
Understanding the phosphorylation-dependent interactions within ZO-1 is critical for elucidating TJ assembly and disassembly mechanisms.
This research may offer insights into therapeutic strategies for TJ-associated diseases.