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Wiley, FEBS Letters, 2004

DOI: 10.1016/s0014-5793(04)00624-6

Wiley, FEBS Letters, 1-3(568), p. 110-116

DOI: 10.1016/j.febslet.2004.05.023

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Voltage sensor mutations differentially target misfolded K+channel subunits to proteasomal and non-proteasomal disposal pathways

Journal article published in 2004 by Rajesh Khanna ORCID, Michael P. Myers, Diane M. Papazian, Eun Jeon Lee
This paper is made freely available by the publisher.
This paper is made freely available by the publisher.

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Abstract

In Shaker K(+) channels, formation of an electrostatic interaction between two charged residues, D316 and K374 in transmembrane segments S3 and S4, respectively, is a key step in voltage sensor biogenesis. Mutations D316K and K374E disrupt formation of the voltage sensor and lead to endoplasmic reticulum retention. We have now investigated the fates of these misfolded proteins. Both are significantly less stable than the wild-type protein. D316K is degraded by cytoplasmic proteasomes, whereas K374E is degraded by a lactacystin-insensitive, non-proteasomal pathway. Our results suggest that the D316K and K374E proteins are misfolded in recognizably different ways, an observation with implications for voltage sensor biogenesis.