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Journal of Cell Science, Vol 112, Issue 14 2391-2396, Copyright © 1999 by Company of Biologists
JOURNAL ARTICLES |
Y Landesman, TW White, TA Starich, JE Shaw, DA Goodenough and DL Paul
Department of Neurobiology, Harvard Medical School, Boston, MA 02115, USA.
Innexins comprise a large family of genes that are believed to encode invertebrate gap junction channel-forming proteins. However, only two Drosophila innexins have been directly tested for the ability to form intercellular channels and only one of those was active. Here we tested the ability of Caenorhabditis elegans family members INX-3 and EAT-5 to form intercellular channels between paired Xenopus oocytes. We show that expression of INX-3 but not EAT-5, induces electrical coupling between the oocyte pairs. In addition, analysis of INX-3 voltage and pH gating reveals a striking degree of conservation in the functional properties of connexin and innnexin channels. These data strongly support the idea that innexin genes encode intercellular channels.
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