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A novel ER alpha-mannosidase-like protein accelerates ER-associated degradation Hosokawa N; Wada I; Hasegawa K; Yorihuzi T; Tremblay LO; Herscovics A; Nagata KEMBO Rep 2001[May]; 2 (5): 415-22The quality control mechanism in the endoplasmic reticulum (ER) discriminates correctly folded proteins from misfolded polypeptides and determines their fate. Terminally misfolded proteins are retrotranslocated from the ER and degraded by cytoplasmic proteasomes, a mechanism known as ER-associated degradation (ERAD). We report the cDNA cloning of Edem, a mouse gene encoding a putative type II ER transmembrane protein. Expression of Edem mRNA was induced by various types of ER stress. Although the luminal region of ER degradation enhancing alpha-mannosidase-like protein (EDEM) is similar to class I alpha1,2-mannosidases involved in N-glycan processing, EDEM did not have enzymatic activity. Overexpression of EDEM in human embryonic kidney 293 cells accelerated the degradation of misfolded alpha1-antitrypsin, and EDEM bound to this misfolded glycoprotein. The results suggest that EDEM is directly involved in ERAD, and targets misfolded glycoproteins for degradation in an N-glycan dependent manner.|*Protein Folding[MESH]|Alkaloids/pharmacology[MESH]|Amino Acid Sequence[MESH]|Animals[MESH]|Cell Line[MESH]|Cloning, Molecular[MESH]|Endoplasmic Reticulum/chemistry/*metabolism[MESH]|Enzyme Inhibitors/pharmacology[MESH]|Gene Expression Regulation/genetics[MESH]|Glycoproteins/*metabolism[MESH]|Humans[MESH]|Mannosidases/antagonists & inhibitors/genetics/metabolism[MESH]|Membrane Proteins/chemistry/genetics/*metabolism[MESH]|Mice[MESH]|Molecular Sequence Data[MESH]|RNA/genetics/metabolism[MESH]|Rabbits[MESH]|Sequence Alignment[MESH]|Serine Proteinase Inhibitors/metabolism[MESH]|Transfection[MESH]|alpha 1-Antitrypsin/chemistry/*metabolism[MESH]|alpha-Mannosidase[MESH] |
