Ku80 Protein

Ku80 Protein

Introduction

Ku80 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.

<div class="infobox infobox-protein"> [@sykora2017]
<table> [@imam2006]
<tr><th colspan="2" style="background:#f0f0f0;">Protein Overview</th></tr> [@weissman2007]
<tr><td><strong>Protein Name</strong></td><td>Ku80</td></tr> [@mcghee2015]
<tr><td><strong>Gene</strong></td><td>XRCC5</td></tr>
<tr><td><strong>UniProt ID</strong></td><td>P13010</td></tr>
<tr><td><strong>PDB Structure</strong></td><td>1JEY, 1JEQ, 2QHR</td></tr>
<tr><td><strong>Molecular Weight</strong></td><td>~83 kDa</td></tr>
<tr><td><strong>Subcellular Localization</strong></td><td>Nucleus (chromatin-bound)</td></tr>
<tr><td><strong>Protein Family</strong></td><td>Ku family</td></tr>
</table>
</div>

Overview

The Ku80 protein (also known as XRCC5) is a subunit of the Ku heterodimer that functions in non-homologous end joining (NHEJ) DNA repair. Ku80 is crucial for maintaining genomic stability in [neurons](/entities/neurons) and other cell types. Deficiencies in Ku80 function have been associated with neurodegeneration and premature aging.

Structure

Ku80 protein forms a heterodimer with Ku70 to create the Ku autoantigen complex. Key structural features include:

• N-terminal domain: DNA-binding domain
• Central region: Flexible linker
• C-terminal domain: Protein-protein interaction with DNA-PKcs
• DNA-binding pocket: Recognizes DNA double-strand breaks

...

Ku80 Protein

Introduction

Ku80 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.

<div class="infobox infobox-protein"> [@sykora2017]
<table> [@imam2006]
<tr><th colspan="2" style="background:#f0f0f0;">Protein Overview</th></tr> [@weissman2007]
<tr><td><strong>Protein Name</strong></td><td>Ku80</td></tr> [@mcghee2015]
<tr><td><strong>Gene</strong></td><td>XRCC5</td></tr>
<tr><td><strong>UniProt ID</strong></td><td>P13010</td></tr>
<tr><td><strong>PDB Structure</strong></td><td>1JEY, 1JEQ, 2QHR</td></tr>
<tr><td><strong>Molecular Weight</strong></td><td>~83 kDa</td></tr>
<tr><td><strong>Subcellular Localization</strong></td><td>Nucleus (chromatin-bound)</td></tr>
<tr><td><strong>Protein Family</strong></td><td>Ku family</td></tr>
</table>
</div>

Overview

The Ku80 protein (also known as XRCC5) is a subunit of the Ku heterodimer that functions in non-homologous end joining (NHEJ) DNA repair. Ku80 is crucial for maintaining genomic stability in [neurons](/entities/neurons) and other cell types. Deficiencies in Ku80 function have been associated with neurodegeneration and premature aging.

Structure

Ku80 protein forms a heterodimer with Ku70 to create the Ku autoantigen complex. Key structural features include:

• N-terminal domain: DNA-binding domain
• Central region: Flexible linker
• C-terminal domain: Protein-protein interaction with DNA-PKcs
• DNA-binding pocket: Recognizes DNA double-strand breaks

The Ku dimer has a ring-like structure that can slide onto DNA ends, encircling the DNA helix.

Normal Function

Ku80 is essential for DNA repair through the non-homologous end joining (NHEJ) pathway:

DNA end binding: Rapidly recognizes and binds to double-strand break ends

DNA-PK activation: Recruits and activates DNA-dependent protein kinase (DNA-PKcs)

Bridge formation: Brings together DNA ends for ligation

Ligation promotion: Facilitates DNA ligase IV/XRCC4 recruitment

Telomere maintenance: Essential for protecting telomere ends

In neurons, Ku80 is particularly important for:

• Maintaining genomic integrity in post-mitotic neurons
• Repairing DNA damage from oxidative stress
• Supporting neuronal survival

Role in Disease

Alzheimer's Disease

• Accumulation of DNA damage in neurons
• Altered Ku80 expression and function
• Potential therapeutic target for enhancing DNA repair

Parkinson's Disease

• Increased vulnerability of dopaminergic neurons
• Links to mitochondrial DNA damage
• Age-related decline in NHEJ efficiency

Amyotrophic Lateral Sclerosis

• Motor neuron sensitivity to DNA damage
• Overlap with RNA metabolism defects
• Therapeutic potential of DNA repair enhancement

Aging and Cognitive Decline

• NHEJ efficiency declines with age
• Cognitive impairment linked to DNA repair deficits
• Ku80 as anti-aging therapeutic target

Therapeutic Targeting

| Approach | Status | Notes |
|----------|--------|-------|
| Small molecule NHEJ enhancers | Research | Enhance Ku80 function |
| Gene therapy | Preclinical | AAV-Ku80 delivery |
| Antioxidants | Clinical | Reduce oxidative DNA damage |
| DNA-PK inhibitors | Research | In cancer, not neurodegeneration |

Expression Pattern

This gene/protein is expressed in various brain regions with specific patterns relevant to neurodegenerative diseases.

Disease Associations

Changes in expression or function are associated with neurodegenerative disease pathophysiology through multiple mechanisms.

Therapeutic Implications

Understanding these associations provides targets for therapeutic intervention in AD, PD, ALS, and related disorders.

Animal Models

Animal model studies support the role of this gene/protein in neurodegeneration.

Background

The study of Ku80 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.

See Also

• XRCC5 Gene
• XRCC6 Gene
• [DNA Damage Response Pathway](/mechanisms/dna-damage-response-pathway)
• [Alzheimer's Disease](/diseases/alzheimers-disease)
• [Parkinson's Disease](/diseases/parkinsons-disease)

External Links

• [UniProt: P13010](https://www.uniprot.org/uniprot/P13010)
• [PDB: 1JEY](https://www.rcsb.org/structure/1JEY)
• [NCBI Protein: NP_068745](https://www.ncbi.nlm.nih.gov/protein/NP_068745)

References

[Canugovi C, et al, (2012) (2012)](https://pubmed.ncbi.nlm.nih.gov/22221689/)

[Sykora P, et al, (2017) (2017)](https://pubmed.ncbi.nlm.nih.gov/28671194/)

[Imam SZ, et al, (2006) (2006)](https://pubmed.ncbi.nlm.nih.gov/16775134/)

[Weissman L, et al, (2007) (2007)](https://pubmed.ncbi.nlm.nih.gov/17433382/)

[McGhee KA, et al, (2015) (2015)](https://pubmed.ncbi.nlm.nih.gov/25697624/)