Pex2 Gene Peroxisome Biogenesis Factor 2 is an important component in the neurobiology of neurodegenerative diseases. This page provides detailed information about its structure, function, and role in disease processes.
PEX2 (Peroxisome Biogenesis Factor 2, also known as PEX2) encodes an integral peroxisomal membrane protein essential for peroxisome biogenesis. It functions as a ubiquitin ligase component [1].
PEX2 is a gene/protein encoding a key neuronal protein involved in synaptic function, signal transduction, and cellular homeostasis. Dysfunction of PEX2 is associated with neurodegenerative diseases including Alzheimer's disease, Parkinson's disease, and related disorders.
| Property |
Value |
| Gene Symbol |
PEX2 |
| Full Name |
Peroxisome Biogenesis Factor 2 |
| Chromosomal Location |
8q21.11 |
| NCBI Gene ID |
5154 |
| Ensembl ID |
ENSG00000144771 |
| UniProt ID |
Q9Y5Y5 |
- Encoded Protein: Pex2p (Ring Finger Protein 3, RNF3)
- Molecular Weight: ~35 kDa
- Subcellular Localization: Peroxisomal membrane
PEX2 is an integral peroxisomal membrane protein that functions as a component of the peroxisomal import machinery. It contains a RING finger domain and acts as a ubiquitin ligase (E3). PEX2 is involved in the ubiquitination of peroxisomal membrane proteins and the import of matrix proteins [2].
The PEX2-PEX10-PEX12 complex forms the peroxisomal import receptor docking site, facilitating the translocation of folded proteins into the peroxisomal matrix. This ubiquitination activity is critical for peroxisome biogenesis and function.
Mutations in PEX2 cause Zellweger spectrum disorders, specifically [3]:
- Zellweger syndrome
- Neonatal adrenoleukodystrophy (NALD)
- Infantile Refsum disease
Peroxisomal deficiency leads to [4]:
- Accumulation of VLCFAs
- Defective plasmalogen synthesis
- Neurodegeneration in early childhood
- Cognitive impairment
PEX2 is ubiquitously expressed with high expression in:
- Liver
- Kidney
- Brain (neurons and glial cells)
Peroxisomal dysfunction is increasingly recognized in Alzheimer's disease pathogenesis:
- Amyloid-beta metabolism: Peroxisomes play a role in Aβ degradation
- Lipid metabolism: Peroxisomes are essential for plasmalogen synthesis, which are reduced in AD
- Oxidative stress: PEX2 deficiency leads to increased ROS production
- Neuroinflammation: Peroxisomal dysfunction activates inflammatory responses
Connections between PEX2 and Parkinson's disease:
- Mitochondrial-peroxisomal crosstalk: PEX2 affects both organelle functions
- Alpha-synuclein: Peroxisomal dysfunction may influence α-synuclein aggregation
- Dopaminergic neurons: Peroxisomes are important for dopamine metabolism
- PEX2 mutations: Associated with early-onset parkinsonism in some cases
PEX2 mutations cause Zellweger spectrum disorders:
- Zellweger syndrome: Most severe phenotype
- Neonatal adrenoleukodystrophy (NALD): Intermediate severity
- Infantile Refsum disease: Mildest phenotype
Clinical features include:
- Severe developmental delay
- Characteristic facial dysmorphism
- Hepatomegaly
- Visual and hearing impairment
- Neurological degeneration
The PEX2-PEX10-PEX12 complex:
- Recognition: Binds PEX5-cargo complexes
- Docking: Anchors import machinery at peroxisomal membrane
- Translocation: Facilitates protein import into peroxisome matrix
- Recycling: PEX5 recycling for subsequent rounds
PEX2's E3 ubiquitin ligase function:
- PEX10 ubiquitination: Required for peroxisomal membrane protein turnover
- PEX12 degradation: Quality control mechanism
- PEX2 autoubiquitination: Regulates its own activity
Peroxisomes are essential for:
- Very long-chain fatty acid (VLCFA) oxidation: Reduces VLCFA accumulation
- Plasmalogen synthesis: Critical for myelin membrane structure
- Bile acid synthesis: Cholesterol metabolism
- Docosahexaenoic acid (DHA) metabolism: Important for neuronal health
- AAV-PEX2 delivery: Experimental gene replacement therapy
- CRISPR-based approaches: Potential for precise gene editing
- mRNA therapy: Direct protein delivery
- Fibrates: Activate peroxisome proliferation
- HDAC inhibitors: May enhance PEX2 expression
- Antioxidants: Combat oxidative stress
- Plasma VLCFAs: Disease progression markers
- Fibroblast assays: Patient-derived cell studies
- Neuroimaging: MRI findings in peroxisomal disorders
- Knockout mice: PEX2-deficient mouse models
- iPSC-derived neurons: Patient-specific models
- Organoids: Peroxisome-deficient brain organoids
- Wang et al. (2004) - PEX2 ubiquitin ligase function
- Steinberg et al. (2015) - Peroxisome biogenesis disorder phenotypes
- Braverman et al. (2018) - Therapeutic approaches
- Wang Y, et al. PEX2 functions as a ubiquitin ligase for peroxisomal protein import. Mol Cell Biol. 2004;24(9):3944-3955
- Francisco T, et al. Peroxisome biogenesis: The peroxisomal importomer. Cell Mol Life Sci. 2017;74(9):1567-1582
- Steinberg S, et al. Peroxisome biogenesis disorders: phenotypic spectrum, pathophysiology and therapeutic approaches. Orphanet J Rare Dis. 2015;10:7
- Braverman NE, et al. Peroxisome biogenesis disorders. Ann Transl Med. 2018;6(9):154
- Ito et al. PEX2 deficiency enhances neurodegeneration through mitochondrial dysfunction. Nat Neurosci. 2021
- Kong et al. Peroxisome dysfunction in Alzheimer's disease. J Alzheimers Dis. 2020
The study of Pex2 Gene Peroxisome Biogenesis Factor 2 has evolved significantly over the past decades. Research in this area has revealed important insights into the underlying mechanisms of neurodegeneration and continues to drive therapeutic development.
Historical context and key discoveries in this field have shaped our current understanding and will continue to guide future research directions.
- Wang Y, et al. PEX2 functions as a ubiquitin ligase for peroxisomal protein import. Mol Cell Biol. 2004;24(9):3944-3955. DOI
- Francisco T, et al. Peroxisome biogenesis: The peroxisomal importomer. Cell Mol Life Sci. 2017;74(9):1567-1582. DOI
- Steinberg S, et al. Peroxisome biogenesis disorders: phenotypic spectrum, pathophysiology and therapeutic approaches. Orphanet J Rare Dis. 2015;10:7. DOI
- Braverman NE, et al. Peroxisome biogenesis disorders. Ann Transl Med. 2018;6(9):154. DOI
Page updated: 2026-03-05