This gene encodes an enzyme that catalyzes hydrolysis of an N(4)-(acetyl-beta-D-glucosaminyl) asparagine residue to N-acetyl-beta-D-glucosaminylamine and a peptide containing an aspartate residue. The encoded enzyme may play a role in the proteasome-mediated degradation of misfolded glycoproteins. Multiple transcript variants encoding different isoforms have been found for this gene.[provided by RefSeq, Feb 2009]
Function:
Specifically deglycosylates the denatured form of N-linked glycoproteins in the cytoplasm and assists their proteasome-mediated degradation. Cleaves the beta-aspartyl-glucosamine (GlcNAc) of the glycan and the amide side chain of Asn, converting Asn to Asp. Prefers proteins containing high-mannose over those bearing complex type oligosaccharides. Can recognize misfolded proteins in the endoplasmic reticulum that are exported to the cytosol to be destroyed and deglycosylate them, while it has no activity toward native proteins. Deglycosylation is a prerequisite for subsequent proteasome-mediated degradation of some, but not all, misfolded glycoproteins.
Subunit:
Component of a complex required to couple retrotranslocation, ubiquitination and deglycosylation composed of NGLY1, SAKS1, AMFR, VCP and RAD23B. Interacts with the proteasome components RAD23B and PSMC1. Interacts with directly with VCP. Interacts with DERL1, bringing it close to the endoplasmic reticulum membrane. Interacts with SAKS1
Subcellular Location:
Cytoplasm
DISEASE:
A multisystem disorder caused by a defect in glycoprotein biosynthesis and characterized by under-glycosylated serum glycoproteins. Characterized by developmental delay, hypotonia, abnormal involuntary movements and alacrima or poor tear production. Other features include microcephaly, intractable seizures, abnormal eye movements and evidence of liver dysfunction, probably due to cytoplasmic accumulation of storage material in vacuoles. The broad spectrum of features reflects the critical role of N-glycoproteins during embryonic development, differentiation, and maintenance of cell functions.
Similarity:
Belongs to the transglutaminase-like superfamily. PNGase family.
Contains 1 PAW domain.
Contains 1 PUB (PUG) domain.
SWISS:
Q96IV0
Gene ID:
55768
Database links:
Entrez Gene: 55768 Human
Entrez Gene: 59007 Mouse
Entrez Gene: 361014 Rat
Omim: 610661 Human
SwissProt: Q4R6F3 Cynomolgus Monkey
SwissProt: Q96IV0 Human
SwissProt: Q9JI78 Mouse
SwissProt: Q5XI55 Rat
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