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TitleCryo-EM structure of an open conformation of a gap junction hemichannel in lipid bilayer nanodiscs.
Journal, issue, pagesStructure, Vol. 29, Issue 9, Page 1040-11047.e3, Year 2021
Publish dateSep 2, 2021
AuthorsAli K Khan / Maciej Jagielnicki / Brad C Bennett / Michael D Purdy / Mark Yeager /
PubMed AbstractTo mediate cell-to-cell communication via gap junction channels (GJCs), connexins (Cx) traffic as hexameric hemichannels to the plasma membrane, which dock end-to-end between adjacent cell membranes, ...To mediate cell-to-cell communication via gap junction channels (GJCs), connexins (Cx) traffic as hexameric hemichannels to the plasma membrane, which dock end-to-end between adjacent cell membranes, thereby forming a dodecameric intercellular conduit. Hemichannels also function independently to mediate the passage of contents between the cytoplasm and extracellular space. To generate hemichannels, the mutation N176Y was introduced into the second extracellular loop of Cx26. The electron cryomicroscopy structure of the hexameric hemichannel in lipid bilayer nanodiscs displays an open pore and a 4-helix bundle transmembrane design that is nearly identical to dodecameric GJCs. In contrast to the high resolution of the transmembrane α-helices, the extracellular loops are less well resolved. The conformational flexibility of the extracellular loops may be essential to facilitate surveillance of hemichannels in apposed cells to identify compatible Cx isoforms that enable intercellular docking. Our results also provide a structural foundation for previous electrophysiologic and permeation studies of Cx hemichannels.
External linksStructure / PubMed:34129834 / PubMed Central
MethodsEM (single particle)
Resolution4.2 Å
Structure data

EMDB-22789:
Human Connexin-26 Hemichannel (open conformation)
Method: EM (single particle) / Resolution: 4.2 Å

Source
  • Homo sapiens (human)

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