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Gap junction channel structure in the early 21st century: Facts and fantasies

Academic Article
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Overview

authors

  • Yeager, Mark
  • Harris, A. L.

publication date

  • October 2007

journal

  • Current Opinion in Cell Biology  Journal

abstract

  • Gap junction channels connect the cytoplasms of adjacent cells through the end-to-end docking of single-membrane structures called connexons, formed by a ring of six connexin monomers. Each monomer contains four transmembrane alpha-helices, for a total of 24 alpha-helices in a connexon. The fundamental structure of the connexon pore is probably similar in unpaired connexons and junctional channels, and for channels formed by different connexin isoforms. Nevertheless, variability in results from structurally focused mutagenesis and electrophysiological studies raise uncertainty about the specific assignments of the transmembrane helices. Mapping of human mutations onto a suggested C(alpha) model predicts that mutations that disrupt helix-helix packing impair channel function. An experimentally determined structure at atomic resolution will be essential to confirm and resolve these concepts.

subject areas

  • Cell Communication
  • Connexins
  • Cryoelectron Microscopy
  • Gap Junctions
  • Humans
  • Models, Molecular
  • Mutation
  • Protein Structure, Quaternary
  • Protein Structure, Secondary
  • Protein Subunits
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Identity

PubMed Central ID

  • PMC2819411

International Standard Serial Number (ISSN)

  • 0955-0674

Digital Object Identifier (DOI)

  • 10.1016/j.ceb.2007.09.001

PubMed ID

  • 17945477
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Additional Document Info

start page

  • 521

end page

  • 528

volume

  • 19

issue

  • 5

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