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Related Experiment Videos

Size selectivity between gap junction channels composed of different connexins.

X Q Gong1, B J Nicholson

  • 1Department of Biological Sciences, State University of New York at Buffalo, 14260, USA.

Cell Communication & Adhesion
|June 18, 2002
PubMed
Summary

Connexin channels (Cx) exhibit diverse size selectivity. Cx32, Cx26, and Cx37 channels show distinct pore sizes, with Cx37 being the most restrictive, revealing connexin-specific permeability characteristics.

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Area of Science:

  • Cell Biology
  • Biophysics
  • Molecular Biology

Background:

  • Gap junction channels facilitate direct cell-to-cell communication.
  • Connexin diversity suggests varied channel properties, including permeability.
  • Previous research indicates both size and charge influence gap junction permeability.

Purpose of the Study:

  • To determine the physical size exclusion limits of gap junction channels formed by different connexins (Cx26, Cx32, Cx37).
  • To specifically assess pore size by eliminating charge contributions using neutral polyethylene glycol (PEG) probes.

Main Methods:

  • Homotypic gap junction channels were formed by expressing Cx26, Cx32, and Cx37 in Xenopus oocytes.
  • Intracellular perfusion of graded neutral PEG probes (varying molecular weights) was performed.

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  • A decrease in channel conductance indicated probe entry and size exclusion limit determination.

    • Main Results:

    • Cx32 channels excluded PEG 400 (11.2 Å) but allowed PEG 300 (9.6 Å), indicating a pore size between these values.
    • Cx26 channels had a size exclusion limit around PEG 200 (8.0 Å).
    • Cx37 channels exhibited the most restricted pore, with a cut-off between PEG 200 (8.0 Å) and TriEG (6.8 Å).

    Conclusions:

    • Gap junction channel permeability is significantly influenced by connexin type and resulting pore size.
    • Cx37 channels possess the most restrictive size selectivity among the tested connexins.
    • These findings highlight the functional diversity of connexin channels beyond simple pore size.