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Cell. 1995 Sep 22;82(6):1001-11.

Cloning and functional analysis of TipE, a novel membrane protein that enhances Drosophila para sodium channel function.

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Department of Biochemical Pharmacology, State University of New York at Buffalo 14260-1200, USA.


Voltage-dependent sodium channels are involved in the initiation and propagation of action potentials in many excitable cells. Here we report that tipE, a gene defined by a temperature-sensitive paralytic mutation in Drosophila, encodes a novel integral membrane protein that dramatically stimulates functional expression in Xenopus oocytes of the Drosophila sodium channel alpha subunit encoded by the paralytic (para) locus. Using a heat shock promoter to control tipE+ gene expression in transgenic flies, we demonstrate that tipE+ gene expression is required during pupal development to rescue adult paralysis. In addition, we demonstrate a role for the tipE gene product in adults.

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