ATG2A Protein is a protein encoded by the [ATG2A](/genes/atg2a) gene. This page describes its structure, normal nervous system function, role in neurodegenerative disease, and potential as a therapeutic target.
Structure
ATG2A is a large peripheral membrane protein with multiple domains:
ATG2A Protein is a protein encoded by the [ATG2A](/genes/atg2a) gene. This page describes its structure, normal nervous system function, role in neurodegenerative disease, and potential as a therapeutic target.
Structure
ATG2A is a large peripheral membrane protein with multiple domains:
N-terminal region: Contains a putative membrane-binding domain that interacts with the ER
Central region: Features WD40 repeat-like beta-propeller structures
C-terminal region: Contains the conserved ATG2 domain essential for autophagosome formation
The protein lacks transmembrane domains but associates peripherally with lipid membranes through amphipathic helices.
Normal Function in the Nervous System
ATG2A plays essential roles in neuronal [autophagy](/entities/autophagy):
Autophagosome formation: Acts as a scaffold protein during the initial stages of autophagosome biogenesis
Lipid droplet metabolism: Regulates lipid droplet mobilization and distribution in [neurons](/entities/neurons)
ER-to-autophagosome lipid transfer: Facilitates membrane expansion of the growing autophagosome
Neuronal homeostasis: Maintains protein quality control in post-mitotic neurons
In the central nervous system, ATG2A is expressed in neurons and [astrocytes](/entities/astrocytes), where it supports cellular clearance mechanisms critical for synaptic plasticity and neuronal survival.
Role in Neurodegeneration
Dysregulation of ATG2A contributes to several neurodegenerative diseases:
Alzheimer's Disease
Impaired autophagic flux observed in AD brains correlates with altered ATG2A expression
Reduced ATG2A function may contribute to accumulation of [amyloid-beta](/proteins/amyloid-beta) and damaged organelles
Studies show ATG2A is downregulated in AD patient brains
Parkinson's Disease
ATG2A variants have been associated with PD risk in genome-wide studies
Loss of ATG2A function leads to accumulation of [alpha-synuclein](/proteins/alpha-synuclein) aggregates
Mitophagy defects in PD models involve ATG2A dysregulation
Amyotrophic Lateral Sclerosis (ALS)
ATG2A mislocalization observed in ALS patient motor neurons
Altered autophagy protein dynamics in ALS pathogenesis
Genetic studies suggest ATG2A may modify ALS disease progression
Huntington's Disease
Autophagy defects in HD models involve ATG2A dysfunction