DGUOK Protein is a protein that dguok is critical for mitochondrial dna (mtdna) synthesis:. This page describes its structure, normal nervous system function, role in neurodegenerative disease, and potential as a therapeutic target.
| Protein Name | Deoxyguanosine Kinase (DGUOK) |
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| Gene | [DGUOK](/genes/dguok) |
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| UniProt ID | P16860 |
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| PDB Structure | 1MG3, 2VQS |
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| Molecular Weight | ~34 kDa (dimer) |
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| Subcellular Localization | Mitochondrial matrix |
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| Protein Family | Deoxyguanosine kinase family |
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DGUOK is a homodimeric mitochondrial enzyme:
- Kinase Domain: Catalytic core with ATP and deoxyguanosine binding sites
- Mitochondrial Targeting: N-terminal presequence for mitochondrial import
- Active Site: Highly conserved residues for phosphate transfer
- Dimer Interface: Forms functional dimers required for activity
DGUOK is critical for mitochondrial DNA (mtDNA) synthesis:
- dGMP Production: Phosphorylates deoxyguanosine to form dGMP
- mtDNA Replication: Provides nucleotides for mitochondrial DNA replication
- Nucleotide Pool Maintenance: Essential for maintaining balanced mitochondrial nucleotide pools
- Purine Metabolism: Participates in mitochondrial purine salvage pathway
DGUOK mutations cause mtDNA depletion:
- Hepatocerebral Form: Most common, with hepatic and neurological involvement
- Clinical Features: Liver failure, developmental delay, seizures, lactic acidosis
- Prognosis: Often severe, with early childhood mortality
- Biochemistry: Reduced mtDNA copy number in liver and brain
- Progressive External Ophthalmoplegia: DGUOK variants associated with PEO
- Hepatocellular Carcinoma: Reduced DGUOK expression in some liver cancers
Therapeutic approaches include:
- Gene Therapy: AAV-mediated DGUOK delivery to liver and brain
- Nucleotide Supplementation: dGMP/dGTP supplementation
- Liver Transplantation: For severe hepatic involvement
- Supportive Care: Management of seizures and metabolic abnormalities
- DGUOK mutations cause mtDNA depletion (2000)
- DGUOK structure and mechanism (2005)
- Gene therapy approaches (2019)
- Mitochondrial nucleotide metabolism (2021)