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The septate junction: a structural basis for intercellular coupling.

N B Gilula, D Branton, P Satir

    Proceedings of the National Academy of Sciences of the United States of America
    |September 1, 1970
    PubMed
    Summary
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    The septate junction structure in mussel gills forms a low-resistance pathway between cells. This pathway facilitates electrical coupling through a channel formed by membrane particles and pleated septal sheets.

    Area of Science:

    • Cell Biology
    • Biophysics
    • Epithelial Physiology

    Background:

    • Mussel gill epithelia exhibit electrical coupling between cells.
    • The structural basis for this low-resistance pathway is not fully understood.

    Purpose of the Study:

    • To elucidate the structure of the septate junction in mussel gill epithelia.
    • To correlate junctional structure with the low-resistance pathway for electrical coupling.

    Main Methods:

    • Conventional electron microscopy (EM) for membrane and septum morphology.
    • Freeze-etching EM to visualize membrane particle arrangement.
    • Optical diffraction to analyze particle and septum congruence.

    Main Results:

    • Septate junctions feature pleated sheets continuous with cell membranes.

    Related Experiment Videos

  • Freeze-etching reveals geometrically arranged 85-Å particles in junctional membranes.
  • Diffraction confirms congruence between membrane particles and septal sheet vertices.

    • Conclusions:

    • The septate junction's structure, including membrane particles and septal sheets, forms a continuous channel.
    • This channel provides the low-resistance pathway for electrical coupling in mussel gill epithelia.