A novel yeast expression system for the overproduction of quality-controlled membrane proteins

Griffith, D., Delipala, C., Leadsham, J.E., Jarvis, S.M. and Oesterhelt, D. 2003. A novel yeast expression system for the overproduction of quality-controlled membrane proteins. F E B S Letters. 553 (1-2), pp. 45-50.

TitleA novel yeast expression system for the overproduction of quality-controlled membrane proteins
AuthorsGriffith, D., Delipala, C., Leadsham, J.E., Jarvis, S.M. and Oesterhelt, D.
Abstract

Saturation of the cell’s protein folding capacity and accumulation of inactive incompletely folded protein often accompanying the overexpression of membrane proteins (MPs) presents an obstacle to their efficient purification in a functional form for structural studies. We present a novel strategy for optimization of functional MP expression in Saccharomyces cerevisiae. This approach exploits the unfolded protein response (UPR) pathway, a stress signaling mechanism that senses the accumulation of unfolded proteins in the endoplasmic reticulum. We demonstrate that a high level of UPR induction upon expression of a MP reflects impaired functional expression of that protein. Tuning the expression level of the protein so as to avoid or minimize UPR induction results in its increased functional expression. UPR status can therefore serve as a proxy variable for the extent of impaired expression of a MP that may even be applicable in the absence of knowledge of the protein’s biological function.

KeywordsMembrane protein, Protein overexpression, Protein folding, Unfolded protein response, Saccharomyces cerevisiae
JournalF E B S Letters
Journal citation553 (1-2), pp. 45-50
ISSN0014-5793
YearOct 2003
Digital Object Identifier (DOI)doi:10.1016/S0014-5793(03)00952-9
Publication dates
PublishedOct 2003

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