Cingulin, a new peripheral component of tight junctions (original) (raw)

Nature volume 333, pages 272–276 (1988)Cite this article

Abstract

The tight junction (zonula occludens), a belt-like region of contact between cells of polarized epithelia, serves as a selective barrier to small molecules and as a total barrier to large molecules1,2, and is involved in the separation between lumenal and basolateral compartments of the epithelium3,4. In the electron microscope, tight junctions show focal regions of apparent fusion between the adjoining cell membranes, and freeze-fractured membranes display an elaborate network of branching and anastomosing strands1,5–8. Very little is known about the molecular composition and architecture of tight junctions. The first specific _zonula occludens_-associated protein, designated ZO-1, has recently been identified in mammalian epithelial and endothelial cells9. Here we describe the identification and purification of a new component of this junc-tional complex in avian brush-border cells, which we name cingulin. Cingulin is an acidic, heat-stable protein, with a highly elongated shape. Immunofluorescence and immunoelectron microscopy of brush-border cells with anti-cingulin antibodies show that cingulin is localized in the apical zone of the terminal web, at the endofacial surfaces of the zonula occludens.

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Authors and Affiliations

  1. MRC Laboratory of Molecular Biology, Hills Road, Cambridge, CB2 2QH, UK
    Sandra Citi, Ross Jakes & John Kendrick-Jones
  2. Department of Chemical Immunology, The Weizmann Institute of Science, Rehovot, 76100, Israel
    Sandra Citi, Helena Sabanay & Benjamin Geiger

Authors

  1. Sandra Citi
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  2. Helena Sabanay
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  3. Ross Jakes
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  4. Benjamin Geiger
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  5. John Kendrick-Jones
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Citi, S., Sabanay, H., Jakes, R. et al. Cingulin, a new peripheral component of tight junctions.Nature 333, 272–276 (1988). https://doi.org/10.1038/333272a0

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