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Cingulin: characterization and localization.

S Citi1, H Sabanay, J Kendrick-Jones

  • 1MRC Laboratory of Molecular Biology, Cambridge, UK.

Journal of Cell Science
|May 1, 1989
PubMed
Summary

Cingulin, a tight junction protein in chicken intestinal epithelium, was purified and characterized as an elongated dimer. This protein is found in epithelial and endothelial cells, suggesting its role in cell adhesion and junctional complex structures.

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Area of Science:

  • Cell Biology
  • Molecular Biology
  • Biochemistry

Background:

  • Tight junctions are crucial for epithelial barrier function.
  • Cingulin is a known component of chicken intestinal tight junctions.
  • Understanding cingulin's structure and localization is key to deciphering its role.

Purpose of the Study:

  • To purify and characterize cingulin from chicken intestinal epithelium.
  • To determine the tissue distribution and subcellular localization of cingulin.
  • To investigate the relationship between cingulin, actin, and other junctional proteins.

Main Methods:

  • Protein purification and biochemical characterization (Stokes' radius, molecular length).
  • Monoclonal antibody production for immunofluorescence and immunoelectron microscopy.
  • Indirect immunofluorescence on frozen sections and cultured cells.
  • Double immunolabeling with anti-vinculin antibodies.
  • Indirect immunoelectron microscopy on ultrathin frozen sections.

Main Results:

  • Purified cingulin is a heat-stable, elongated dimer (Mr 108,000 polypeptides).
  • Cingulin localizes to the junctional complex in polarized epithelia and endothelium, absent in mesenchymal/myogenic cells.
  • In cultured cells, cingulin is found at cell-cell contacts, near vinculin-rich adherens junctions, and co-localizes with actin at tight junctions.
  • Immunoelectron microscopy shows cingulin on the endofacial surface of tight junctions (zonula occludens).

Conclusions:

  • Cingulin is a specific component of the tight junction complex in avian cells.
  • Its localization suggests a role in regulating tight junction structure and function.
  • Actin filaments may be associated with cingulin at the tight junction level.
  • Cingulin is distinct from proteins found in adherens junctions and desmosomes.

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