Abstract
The formation of intra- and interchain disulphide bonds constitutes an integral part of the maturation of most secretory and membrane-bound proteins in the endoplasmic reticulum1,2. Evidence indicates that members of the protein disulphide isomerase (PDI) superfamily are part of the machinery needed for proper oxidation and isomerization of disulphide bonds3,4,5,6. Models based on in vitro studies predict that the formation of mixed disulphide bonds between oxidoreductase and substrate is intermediate in the generation of the native intrachain disulphide bond in the substrate polypeptide7. Whether this is how thiol oxidoreductases work inside the endoplasmic reticulum is not clear. Nor has it been established which of the many members of the PDI superfamily interacts directly with newly synthesized substrate proteins, because transient mixed disulphides have never been observed in the mammalian endoplasmic reticulum during oxidative protein folding7,8. Here we describe the mechanisms involved in co- and post-translational protein oxidation in vivo. We show that the endoplasmic-reticulum-resident oxidoreductases PDI and ERp57 are directly involved in disulphide oxidation and isomerization, and, together with the lectins calnexin and calreticulin, are central in glycoprotein folding in the endoplasmic reticulum of mammalian cells.
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Acknowledgements
We thank T. Wileman, P. Van Nguyen and H. D. Söling for providing antibodies to ERp57 and PDI; L. Elgaard, C. Galli and A. V. Nicola for comments on the manuscript; and W. Chen and M. Corti for technical assistance. This work was supported by the ETHZ and by a Roche Foundation grant to M.M. and A.H.
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Molinari, M., Helenius, A. Glycoproteins form mixed disulphides with oxidoreductases during folding in living cells. Nature 402, 90–93 (1999). https://doi.org/10.1038/47062
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DOI: https://doi.org/10.1038/47062
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