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

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 3.2.1.106) 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.
Mesh Terms:
Endoplasmic Reticulum, Glycoproteins, Saccharomyces cerevisiae, alpha-Glucosidases
FEMS Yeast Res.
Date: Sep. 01, 2004
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