Xrcc4 Protein is an important component in the neurobiology of neurodegenerative diseases. This page provides detailed information about its structure, function, and role in disease processes.
| Protein Name | XRCC4 |
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| Gene Symbol | XRCC4 |
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| UniProt ID | Q16374 |
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| Molecular Weight | ~33 kDa |
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| Subcellular Localization | Nucleus |
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| Protein Family | DNA repair protein |
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## Overview
This section provides a comprehensive overview of the gene/protein and its role in the nervous system and neurodegenerative diseases.
XRCC4 is a 336-amino acid protein with an elongated structure:
- N-terminal domain (residues 1-150): DNA binding and dimerization
- Coiled-coil region (residues 150-250): Mediates tetramer formation
- C-terminal domain (residues 250-336): Ligase IV binding
XRCC4 forms a stable heterodimer with XLF (Cernunnos/XRCC4-like factor) and a heterotetramer with DNA ligase IV.
XRCC4 is essential for classical non-homologous end joining (c-NHEJ), the predominant pathway for repairing DNA double-strand breaks:
NHEJ Complex Assembly:
- Ku70/Ku80 heterodimer binds DNA ends
- DNA-PKcs recruited and activated
- XRCC4-LIG4 complex recruited
- XLF (Cernunnos) stabilizes the complex
- Artemis processes DNA ends
- XRCC4-LIG4 ligates the break
Biological Functions:
- V(D)J recombination in lymphocytes
- Telomere maintenance
- Genomic stability in post-mitotic cells
Cancer:
- XRCC4 polymorphisms associated with increased risk of various cancers
- Reduced XRCC4 expression in some tumors
- Affects response to radiotherapy
Immunodeficiency:
- Impaired V(D)J recombination leads to severe combined immunodeficiency (SCID) phenotype
Therapeutic targeting:
- DNA-PKcs inhibitors: Synergy with XRCC4 in NHEJ inhibition
- Radiation sensitizers: Targeting NHEJ to enhance cancer radiotherapy
- Immunotherapy: NHEJ modulation for CAR-T cell engineering
No direct XRCC4-targeted drugs in clinical use.
- Critchlow et al., XRCC4 encodes a protein that interacts with DNA ligase IV (1997)
- Sibanda et al., Crystal structure of XRCC4-DNA ligase IV complex (2001)
XRCC4 Gene, Non-Homologous End Joining, DNA Repair, LIG4 Protein
The study of Xrcc4 Protein 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.
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