APE2 Protein is a protein encoded by the APEX2 gene that ape2 plays critical roles in dna repair:. This page describes its structure, normal nervous system function, role in neurodegenerative disease, and potential as a therapeutic target.
APE2 (Apurinic/apyrimidinic Endonuclease 2) is a DNA repair enzyme involved in the base excision repair (BER) pathway, critical for maintaining genomic integrity in neurons.
| Property |
Value |
| Gene |
APEX2 |
| UniProt |
Q9Y2D5 |
| PDB |
5W6V, 5VBC |
| Molecular Weight |
~57 kDa |
| Subcellular Localization |
Nucleus and mitochondria |
| Protein Family |
Exonuclease III family (Xth family) |
APE2 is a 513-amino acid protein with:
- N-terminal region: Contains mitochondrial targeting sequence
- Catalytic domain: Exonuclease III-like endonuclease domain
- HDEH motif: Conserved catalytic residues for endonuclease activity
- Nuclear localization signal: Present in the C-terminal region
APE2 plays critical roles in DNA repair:
- Base excision repair (BER): Cleaves apurinic/apyrimidinic (AP) sites
- DNA damage response: Recognizes and repairs oxidative DNA damage
- Cell cycle regulation: Checkpoint function in response to DNA damage
- Mitochondrial DNA repair: Maintains mtDNA integrity
- Transcriptional regulation: Interacts with chromatin remodeling complexes
- Elevated APE2 expression in AD brains - possibly compensatory
- Increased DNA damage in AD neurons
- Oxidative stress leads to base modifications requiring APE2 repair
- May contribute to neuronal vulnerability
- DNA repair deficits in dopaminergic neurons
- APE2 may be affected by mitochondrial dysfunction
- Contributes to progressive neuronal loss
- APE2 mutations cause ATLD-like syndrome (MIM 604121)
- Features include cerebellar ataxia and immunodeficiency
- APE2 is overexpressed in multiple cancers
- Supports tumor cell proliferation
- Potential therapeutic target
- PARP inhibitors: Enhance DNA repair stress in cancer
- DNA repair modulators: Being developed for neurodegeneration
- Antioxidants: Reduce oxidative DNA damage burden
- Gene therapy: Being explored for DNA repair disorders