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    Proc Natl Acad Sci U S A. 1992 May 1;89(9):3736-40.

    Functional expression of a probable Arabidopsis thaliana potassium channel in Saccharomyces cerevisiae.

    Anderson JA, Huprikar SS, Kochian LV, Lucas WJ, Gaber RF.

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    Department of Biochemistry, Molecular Biology and Cell Biology, Northwestern University, Evanston, IL 60208.

    Abstract

    We report the isolation of a cDNA (KAT1) from Arabidopsis thaliana that encodes a probable K+ channel. KAT1 was cloned by its ability to suppress a K+ transport-defective phenotype in mutant Saccharomyces cerevisiae cells. This suppression is sensitive to known K+ channel blockers, including tetraethylammonium and Ba2+ ions. The KAT1 cDNA contains an open reading frame capable of encoding a 78-kDa protein that shares structural features found in the Shaker superfamily of K+ channels. These include a cluster of six putative membrane-spanning helices (S1-S6) at the amino terminus of the protein, a presumed voltage-sensing region containing Arg/Lys-Xaa-Xaa-Arg/Lys repeats within S4, and the highly conserved pore-forming region (known as H5 or SS1-SS2). Our results suggest that the structural motif for K+ channels has been conserved between plants and animals.

    PMID:
    1570292
    [PubMed - indexed for MEDLINE]
    PMCID:
    PMC525565
    Free PMC Article

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