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.
journal_name
FEBS Lettjournal_title
FEBS lettersauthors
Myers MP,Khanna R,Lee EJ,Papazian DMdoi
10.1016/j.febslet.2004.05.023keywords:
subject
Has Abstractpub_date
2004-06-18 00:00:00pages
110-6issue
1-3eissn
0014-5793issn
1873-3468pii
S0014579304006246journal_volume
568pub_type
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