EDEM2 (ER Degradation Enhancer, Mannosidase Alpha-Like 2), also known as HSPA5, is a key regulator of endoplasmic reticulum-associated degradation (ERAD). The gene encodes a mannosidase-like protein that recognizes and targets misfolded glycoproteins for proteasomal degradation. EDEM2 plays a critical role in protein quality control, which is especially important in neurons where protein aggregation is a hallmark of many neurodegenerative diseases.
The EDEM2 gene is located on chromosome 7p22.1 and encodes a 639-amino acid protein with: [1]
EDEM2 is a type II transmembrane protein that localizes to the endoplasmic reticulum. [2]
In the nervous system, EDEM2 is essential for: [3]
ER-Associated Degradation (ERAD): EDEM2 recognizes misfolded glycoproteins in the ER and targets them for retrotranslocation to the cytosol for proteasomal degradation
Protein Quality Control: Prevents accumulation of misfolded proteins in the ER lumen
Unfolded Protein Response (UPR): EDEM2 expression is upregulated during ER stress as part of the adaptive UPR
Neuronal Protein Homeostasis: Critical for maintaining proteostasis in neurons, which are long-lived cells particularly vulnerable to protein aggregation
EDEM2 has complex roles in Alzheimer's disease: [4]
In Parkinson's disease, EDEM2 is relevant to:
EDEM2 plays a role in ALS:
EDEM2 is involved in prion disease pathogenesis:
EDEM2 represents a therapeutic target for neurodegenerative diseases:
EDEM2 is expressed in all tissues with high expression in:
Subcellular localization: Endoplasmic reticulum membrane.
EDEM2 interacts with:
EDEM2 is a critical component of ER-associated degradation that helps neurons manage misfolded protein burden. Its role in protein quality control makes it relevant to multiple neurodegenerative diseases characterized by protein aggregation, including Alzheimer's, Parkinson's, and ALS.
Kaneko et al. EDEM2 and ER stress in neurodegeneration (2020). 2020. ↩︎
Hetz & Saxena, ER stress in Alzheimer's disease (2017). 2017. ↩︎
Kimata et al. EDEM2 and protein quality control (2021). 2021. ↩︎