A novel disulphide switch mechanism in Ero1 balances ER oxidation in human cells
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A novel disulphide switch mechanism in Ero1 balances ER oxidation in human cells. / Appenzeller-Herzog, Christian; Riemer, Jan; Christensen, Brian; Sørensen, Esben B.; Ellgaard, Lars.
In: EMBO Journal, Vol. 27, 2008, p. 2977–2987.Research output: Contribution to journal › Journal article › Research › peer-review
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TY - JOUR
T1 - A novel disulphide switch mechanism in Ero1 balances ER oxidation in human cells
AU - Appenzeller-Herzog, Christian
AU - Riemer, Jan
AU - Christensen, Brian
AU - Sørensen, Esben B.
AU - Ellgaard, Lars
N1 - Keywords: disulphide-bond formation, endoplasmic reticulum, ER oxidoreductin 1, protein disulphide isomerase, redox homoeostasis
PY - 2008
Y1 - 2008
N2 - Oxidative maturation of secretory and membrane proteins in the endoplasmic reticulum (ER) is powered by Ero1 oxidases. To prevent cellular hyperoxidation, Ero1 activity can be regulated by intramolecular disulphide switches. Here, we determine the redox-driven shutdown mechanism of Ero1, the housekeeping Ero1 enzyme in human cells. We show that functional silencing of Ero1 in cells arises from the formation of a disulphide bond-identified by mass spectrometry-between the active-site Cys94 (connected to Cys99 in the active enzyme) and Cys131. Competition between substrate thiols and Cys131 creates a feedback loop where activation of Ero1 is linked to the availability of its substrate, reduced protein disulphide isomerase (PDI). Overexpression of Ero1-Cys131Ala or the isoform Ero1, which does not have an equivalent disulphide switch, leads to augmented ER oxidation. These data reveal a novel regulatory feedback system where PDI emerges as a central regulator of ER redox homoeostasis.
AB - Oxidative maturation of secretory and membrane proteins in the endoplasmic reticulum (ER) is powered by Ero1 oxidases. To prevent cellular hyperoxidation, Ero1 activity can be regulated by intramolecular disulphide switches. Here, we determine the redox-driven shutdown mechanism of Ero1, the housekeeping Ero1 enzyme in human cells. We show that functional silencing of Ero1 in cells arises from the formation of a disulphide bond-identified by mass spectrometry-between the active-site Cys94 (connected to Cys99 in the active enzyme) and Cys131. Competition between substrate thiols and Cys131 creates a feedback loop where activation of Ero1 is linked to the availability of its substrate, reduced protein disulphide isomerase (PDI). Overexpression of Ero1-Cys131Ala or the isoform Ero1, which does not have an equivalent disulphide switch, leads to augmented ER oxidation. These data reveal a novel regulatory feedback system where PDI emerges as a central regulator of ER redox homoeostasis.
U2 - 10.1038/emboj.2008.202
DO - 10.1038/emboj.2008.202
M3 - Journal article
C2 - 18833192
VL - 27
SP - 2977
EP - 2987
JO - E M B O Journal
JF - E M B O Journal
SN - 0261-4189
ER -
ID: 9700629