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Sodium channels encoded by the rat IIA cDNA clone [Auld, V. J., Goldin, A. L., Krafte, D. S., Marshall, J., Dunn, J., Catterall, W. A., Lester, H. A., Davidson, N. &amp; Dunn, R. J. (1988) Neuron 1, 449-461] differ at seven amino acid residues from those encoded by the rat II cDNA [Noda, M., Ikeda, T., Kayano, T., Suzuki, H., Takeshima, H., Kurasaki, M., Takahashi, H. &amp; Numa, S. (1986) Nature (London) 320, 188-192]. When expressed in Xenopus oocytes, rat IIA channels display a current-voltage relationship that is shifted 20-25 mV in the depolarizing direction relative to channels expressed from rat II cDNA or rat brain poly(A)+ mRNA. By modifying each variant residue in rat IIA to the corresponding residue in rat II, we demonstrate that a single Phe----Leu substitution at position 860 in the S4 segment of domain II is sufficient to shift the current-voltage relationship to that observed for channels expressed from rat brain poly(A)+ RNA or rat II cDNA. Rat genomic DNA encodes leucine but not phenylalanine at position 860, indicating that the phenylalanine at this position in rat IIA cDNA likely results from reverse transcriptase error.

A neutral amino acid change in segment IIS4 dramatically alters the gating properties of the voltage-dependent sodium channel.