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Related Experiment Videos

Correlation analysis of gap junction lattice images.

G E Sosinsky1, T S Baker, D L Caspar

  • 1Rosenstiel Basic Medical Sciences Research Center, Brandeis University, Waltham, Massachusetts 02254-9110.

Biophysical Journal
|November 1, 1990
PubMed
Summary

Connexon structures in gap junctions show varied orientations and local clustering. This suggests hexagonal ordering arises from short-range repulsive forces between connexons.

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Area of Science:

  • Structural biology
  • Biophysics
  • Cell biology

Background:

  • Gap junctions are crucial for intercellular communication.
  • Connexons form the basic structural units of gap junctions.
  • Understanding connexon arrangement is key to gap junction function.

Purpose of the Study:

  • To analyze the polymorphic structures of connexons within gap junction domains.
  • To investigate connexon orientation and packing in different specimen preparations.
  • To elucidate the forces governing connexon lattice organization.

Main Methods:

  • Fourier averaging of electron micrographs from low-irradiation studies.
  • Correlation averaging applied to negatively stained and frozen-hydrated specimens.
  • Analysis of stain distribution and connexon orientation variations.

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Main Results:

  • Two distinct connexon populations with opposite skew orientations were identified in frozen-hydrated specimens.
  • Connexons exhibited local clustering based on their orientation.
  • Packing disorder analysis revealed liquid-like displacements at larger separations, yet conserved long-range orientational order.

Conclusions:

  • The hexagonal ordering of connexons is likely driven by short-range repulsive forces.
  • Connexon arrangement displays characteristics of both liquid and crystalline states.
  • Structural heterogeneity within gap junction domains influences intercellular communication.