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- Title
Sterols regulate ER-export dynamics of secretory cargo protein ts-O45-G.
- Authors
Runz, Heiko; Miura, Kota; Weiss, Matthias; Pepperkok, Rainer
- Abstract
Alterations in endoplasmic reticulum (ER) cholesterol are fundamental for a variety of cellular processes such as the regulation of lipid homeostasis or efficient protein degradation. We show that reduced levels of cellular sterols cause a delayed ER-to-Golgi transport of the secretory cargo membrane protein ts-O45-G and a relocation to the ER of an endogenous protein cycling between the ER and the Golgi complex. Transport inhibition is characterized by a delay in the accumulation of ts-O45-G in ER-exit sites (ERES) and correlates with a reduced mobility of ts-O45-G within ER membranes. A simple mathematical model describing the kinetics of ER-exit predicts that reduced cargo loading to ERES and not the reduced mobility of ts-O45-G accounts for the delayed ER-exit and arrival at the Golgi. Consistent with this, membrane turnover of the COPII component Sec23p is delayed in sterol-depleted cells. Altogether, our results demonstrate the importance of sterol levels in COPII mediated ER-export.
- Publication
The EMBO journal, 2006, Vol 25, Issue 13, p2953
- ISSN
0261-4189
- Publication type
Journal Article
- DOI
10.1038/sj.emboj.7601205