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

Michael P. Myers, Rajesh Khanna, Eun Jeon Lee, Diane M. Papazian

Research output: Contribution to journalArticlepeer-review

9 Scopus citations


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.

Original languageEnglish (US)
Pages (from-to)110-116
Number of pages7
JournalFEBS Letters
Issue number1-3
StatePublished - Jun 18 2004
Externally publishedYes


  • Biogenesis
  • Degradation
  • ER, endoplasmic reticulum
  • ERAD, ER-associated degradation
  • HEK293T, human embryonic kidney 293T cells
  • PBS, phosphate-buffered saline
  • Quality control
  • Shaker channel
  • dMJ, deoxymannojirimycin
  • dNJ, deoxynojirimycin

ASJC Scopus subject areas

  • Biophysics
  • Structural Biology
  • Biochemistry
  • Molecular Biology
  • Genetics
  • Cell Biology


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