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A cluster of hydrophobic amino acid residues required for fast Na(+)-channel inactivation.

Open access
West, J W, Patton, D E, Scheuer, T, Wang, Y, Goldin, A L, Catterall, W A·1992·Proceedings of the National Academy of Sciences

Abstract

The inward Na+ current underlying the action potential in nerve is terminated by inactivation. The preceding report shows that deletions within the intracellular linker between domains III and IV remove inactivation, but mutation of conserved basic and paired acidic amino acids has little effect. Here we show that substitution of glutamine for three clustered hydrophobic amino acids, Ile-1488, Phe-1489, and Met-1490, completely removes fast inactivation. Substitution of Met-1490 alone slows inactivation significantly, substitution of Ile-1488 alone both slows inactivation and makes it incomplete, and substitution of Phe-1489 alone removes inactivation nearly completely. These results demonstrate an essential role of Phe-1489 in Na(+)-channel inactivation. It is proposed that the hydrophobic cluster of Ile-1488, Phe-1489, and Met-1490 serves as a hydrophobic latch that stabilizes the inactivated state in a hinged-lid mechanism of Na(+)-channel inactivation.

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Metadata

Authors
West, J. W., Patton, D. E., Scheuer, T., Wang, Y., Goldin, A. L., & Catterall, W. A.
Venue
Proceedings of the National Academy of Sciences
Published
1992-11-15
Volume
89
Issue
22
Pages
10910-10914
ISSN
  • 0027-8424 (ISSN-L)
  • 1091-6490
OpenAlex
W1968903551
Cited by
830
References
0
FWCI
8.40
Type
journal article
Language
en
Open access
green

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CoChat. (2026). Citation check: A cluster of hydrophobic amino acid residues required for fast Na(+)-channel inactivation. https://app.cochat.ai/papers/10.1073/pnas.89.22.10910
The paper
West, J. W., Patton, D. E., Scheuer, T., Wang, Y., Goldin, A. L., & Catterall, W. A. (1992). A cluster of hydrophobic amino acid residues required for fast Na(+)-channel inactivation. Proceedings of the National Academy of Sciences. https://doi.org/10.1073/pnas.89.22.10910

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