A mammalian transient type K+ channel, Rat Kv1.4, Has two potential domains that could produce rapid inactivation

Shun Ichi Kondoh, Kuniaki Ishii, Yasuhiro Nakamura, Norio Taira

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    30 Citations (Scopus)

    Abstract

    The 'bail and chain' model has been shown to be suitable for explaining the rapid inactivation of voltage-dependent K+ channels. For the Drosophila Shaker K+ channel (ShB), the first 20 residues of the amino terminus have been identified as the inactivation ball that binds to the open channel pore and blocks ion flow (Hoshi, T., Zagotta, W. N., and Aldrich, R. W. (1990) Science 250, 533-38; Zagotta, W. N., Hoshi, T., and Aldrich, R. W. (1990) Science 250, 568-571). We studied the structural elements responsible for rapid inactivation of a mammalian transient type K+ channel (rat Kv1.4) by constructing various mutants in the amino terminus and expressing them in Xenopus oocytes. Although it has been reported that the initial 37 residues might form the inactivation ball for rat Kv1.4 (Tseng-Crank, J., Yao, J.-A., Berman M. F., and Tseng, G.-N. (1993) J. Gen. Physiol. 102, 1057-1083), we found that not only the initial 37 residues, but also the following region, residues 40-68, could function independently as an inactivation gate. Like the Shaker inactivation ball, both potential inactivation domains have a hydrophobic amino-terminal region and a hydrophilic carboxyl-terminal region having net positive charge, which is essential for the domains to function as an inactivation gate.

    Original languageEnglish
    Pages (from-to)19333-19338
    Number of pages6
    JournalJournal of Biological Chemistry
    Volume272
    Issue number31
    DOIs
    Publication statusPublished - 1997 Aug 1

    ASJC Scopus subject areas

    • Biochemistry
    • Molecular Biology
    • Cell Biology

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