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FEMS Yeast Res. 2004 Sep;4(8):815-20.

DER7, encoding alpha-glucosidase I is essential for degradation of malfolded glycoproteins of the endoplasmic reticulum.

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Institut für Biochemie, Universität Stuttgart, Pfaffenwaldring 55, 70569 Stuttgart, Germany.


Proteins entering the endoplasmic reticulum (ER) have to acquire an export-competent structure before they are delivered to their final destination. This folding process is monitored by an ER protein quality control system. Folding-incompetent conformers are eliminated via a mechanism called ER-associated protein degradation (ERAD). Genetic studies in the yeast Saccharomyces cerevisiae have revealed that carbohydrate modification plays a crucial role in these processes. Here we show that a previously isolated der mutant (der7-1) is defective in ERAD. We identify DER7 as the gene encoding N-glycan-processing alpha-glucosidase I (EC of the ER and demonstrate that its inactivity, due to a substitution of the conserved glycine residue at position 725 by arginine (G725R) in the der7-1 mutant, leads to ER-stress.

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