Abstract
The formation of disulphide bonds in mammalian secretory and cell-surface proteins occurs in the lumen of the endoplasmic reticulum and is believed to be catalysed by the enzyme protein disulphide-isomerase (PDI)1. The evidence for this physiological role for PDI is circumstantial and relates to the cell and tissue distribution of the enzyme, its developmental behaviour and its catalytic properties in vitro2–4. A clear requirement for PDI in the correct folding or assembly of disulphide-bonded proteins during biosynthesis has not been demonstrated. We have prepared dog pancreas microsomes which are deficient in soluble lumenal proteins, including PDI, but which are still able to translocate and process proteins synthesized in vitro5,6. Using the formation of intramolecular disulphide bonds during the in vitro synthesis of γ-gliadin7, a wheat storage protein, as a model, we have demonstrated that these microsomes are defective in co-translational formation of disulphide bonds. Reconstitution of these microsomes with purified PDI reverses this defect.
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Bulleid, N., Freedman, R. Defective co-translational formation of disulphide bonds in protein disulphide-isomerase-deficient microsomes. Nature 335, 649–651 (1988). https://doi.org/10.1038/335649a0
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DOI: https://doi.org/10.1038/335649a0
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