GO:0120136 dUMP kinase activity: Mechanism, Genes and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0120136 dUMP kinase activity is a molecular function defined by the reaction ATP + dUMP = ADP + dUDP, catalyzed by dUMP kinase enzymes.
• The enzyme belongs to the thymidylate/uridylate kinase family and shows conformational diversity that defines substrate specificity.
• dUMP kinase activity is part of pyrimidine nucleotide metabolism and is important for maintaining balanced dNTP pools.
• In Drosophila melanogaster, thymidylate kinase (dUMP kinase) has been molecularly characterized, linking this activity to developmental processes.
• Low incorporation of dUMP by some thermostable DNA polymerases can limit PCR amplification, highlighting the practical relevance of dUMP metabolism.
• dUMP kinase activity is a potential target for antimicrobial and anticancer strategies due to its role in nucleotide biosynthesis.
Description
dUMP kinase activity (GO:0120136) is a molecular function that catalyzes the phosphorylation of deoxyuridine monophosphate (dUMP) to deoxyuridine diphosphate (dUDP) using ATP as the phosphate donor. This reaction is a key step in the pyrimidine salvage and de novo pathways, contributing to the maintenance of cellular dNTP pools required for DNA replication and repair. The enzyme responsible, dUMP kinase, is also known as thymidylate kinase or deoxyuridine monophosphate kinase, and its activity has been studied in various organisms, including Drosophila melanogaster and Candida albicans. Understanding dUMP kinase activity is important for researchers in nucleotide metabolism, cancer biology, and antimicrobial drug discovery, as imbalances in dNTP pools can lead to mutagenesis and genomic instability. Moreover, the enzyme's substrate specificity and conformational dynamics have been explored to design specific inhibitors.
dUMP kinase activity At A Glance
| GO ID | GO:0120136 |
|---|---|
| GO term | dUMP kinase activity |
| Ontology | molecular_function |
| Synonym | ATP:dUMP phosphotransferase activity, deoxyuridine monophosphate kinase activity, dUMP-kinase activity |
| Definition | Catalysis of the reaction: ATP + dUMP = ADP + dUDP. |
| Major function | Phosphorylation of dUMP to dUDP in pyrimidine nucleotide metabolism |
| Related enzyme family | Thymidylate/uridylate kinase family |
| Reaction | ATP + dUMP = ADP + dUDP |
What Is GO:0120136?
dUMP kinase activity (GO:0120136) is defined as the catalysis of the reaction: ATP + dUMP = ADP + dUDP. In other words, it is the enzyme activity that transfers a phosphate group from ATP to deoxyuridine monophosphate, producing deoxyuridine diphosphate and ADP. This activity is synonymous with ATP:dUMP phosphotransferase activity, deoxyuridine monophosphate kinase activity, and dUMP-kinase activity.
Why Is dUMP kinase activity Important in Cell Biology?
dUMP kinase activity is crucial for maintaining the balance of deoxyribonucleotide pools, which are essential for DNA replication and repair. Dysregulation of this activity can lead to altered dNTP pools, mutagenesis, and cell death, making it a target for anticancer and antimicrobial therapies. Additionally, understanding dUMP kinase activity helps explain the mechanisms of certain DNA polymerases and PCR amplification limitations.
• Maintains dNTP pools for DNA synthesis and repair.
• Involved in pyrimidine salvage and de novo pathways.
• Potential target for antimicrobial drugs against pathogens like Candida albicans.
• Relevant to cancer biology due to role in nucleotide metabolism.
• Affects PCR amplification efficiency when dUMP incorporation is low.
• Studied in model organisms like Drosophila melanogaster for developmental roles.
• Contributes to error-free versus mutagenic processing of genomic uracil.
• Enzyme kinetics and substrate specificity are of biochemical interest.
• May influence mitochondrial function and neurodegenerative disease.
• Provides a basis for understanding thymidylate kinase deficiencies.
Molecular Mechanism of dUMP kinase activity
Substrate Binding and Specificity
In simple terms: The enzyme grabs dUMP and ATP to start the reaction.
dUMP kinase binds its substrates, dUMP and ATP, in a sequential manner. Conformational diversity in the enzyme's active site defines its substrate specificity, as shown in studies of thymidylate/uridylate kinase from Candida albicans. The enzyme discriminates between dUMP and other nucleotides to ensure proper phosphorylation.
Catalytic Phosphoryl Transfer
In simple terms: The enzyme moves a phosphate from ATP onto dUMP.
The catalytic mechanism involves the transfer of the gamma-phosphate from ATP to the 5'-hydroxyl group of dUMP, yielding dUDP and ADP. This phosphoryl transfer is essential for converting dUMP into a form that can be further phosphorylated to dTTP or dUTP.
Role in Pyrimidine Metabolism
In simple terms: This reaction is a step in making building blocks for DNA.
dUMP kinase activity is part of the pyrimidine nucleotide metabolic pathway. It provides dUDP, which can be phosphorylated to dUTP and then either incorporated into DNA or hydrolyzed by dUTPase to prevent misincorporation. This balance is critical for genomic stability.
Enzyme Structure and Conformational Changes
In simple terms: The enzyme changes shape to do its job.
Structural studies of thymidylate kinase from Drosophila melanogaster and Candida albicans reveal that the enzyme undergoes conformational changes upon substrate binding. These dynamics are important for catalysis and can be targeted by inhibitors.
Regulation and Cofactors
In simple terms: Other molecules can affect how well the enzyme works.
dUMP kinase activity requires magnesium ions as cofactors for ATP binding and catalysis. The activity can be regulated by cellular energy status and nucleotide pools, although specific regulatory mechanisms are not fully defined. Metformin has been suggested to affect lysosomal targeting and nucleotide metabolism, which may indirectly influence dUMP kinase activity.
Key Genes Involved in GO:0120136 dUMP kinase activity
The following genes and proteins are directly or indirectly associated with dUMP kinase activity and pyrimidine nucleotide metabolism.
| Gene | Major Role | Research Relevance |
|---|---|---|
| dUTPase | Hydrolyzes dUTP to dUMP, preventing misincorporation | Studied for PCR enhancement and genomic stability |
| Thymidylate kinase (Drosophila) | Catalyzes dUMP phosphorylation | Model for developmental roles |
| Thymidylate/uridylate kinase (Candida albicans) | Substrate-specific kinase | Antifungal target |
| Pyrimidine nucleoside monophosphate kinase | Phosphorylates pyrimidine monophosphates | Purified from rat bone marrow |
| DNA polymerase (thermostable) | Incorporates dUMP during PCR | Limits PCR amplification |
| Uracil-DNA glycosylase | Removes uracil from DNA | Error-free repair |
| dCMP deaminase | Produces dUMP from dCMP | Pyrimidine salvage |
| Thymidylate synthase | Converts dUMP to dTMP | Nucleotide metabolism |
| Nucleoside diphosphate kinase | Phosphorylates dUDP to dUTP | dNTP synthesis |
| Ribonucleotide reductase | Produces deoxyribonucleotides | dNTP pool regulation |
| ABNOH-linked nucleotides | Bioconjugation tools | Cross-linking with proteins |
| Metformin | Affects lysosomal targeting | Neurodegenerative disease |
| dUTPase (archaeal) | Enhances PCR | Prevents dUTP incorporation |
| Thymidine kinase | Phosphorylates thymidine | Salvage pathway |
| UMP kinase | Phosphorylates UMP to UDP | Pyrimidine synthesis |
| CMP kinase | Phosphorylates CMP | Pyrimidine metabolism |
| dTMP kinase | Phosphorylates dTMP | Thymidine nucleotide synthesis |
How Is dUMP kinase activity Regulated?
dUMP kinase activity is regulated at multiple levels. The enzyme's activity can be influenced by the availability of substrates and cofactors such as ATP and magnesium. Cellular energy status and nucleotide pools may affect its function. Additionally, post-translational modifications and interactions with other proteins could modulate activity, although specific mechanisms are not well characterized. Metformin has been implicated in lysosomal targeting and may indirectly affect nucleotide metabolism.
dUMP kinase activity and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| dUTPase | Cancer, genomic instability | KO cell lines, overexpression |
| Thymidylate kinase (Candida albicans) | Fungal infections | Enzyme inhibition assays |
| Thymidylate kinase (Drosophila) | Developmental defects | RNAi knockdown |
| Metformin target | Neurodegeneration | Lysosomal targeting studies |
| DNA polymerase | PCR limitations | dUMP incorporation assays |
Cancer and Genomic Instability
Altered dUMP kinase activity can lead to imbalanced dNTP pools, which may cause uracil misincorporation into DNA and subsequent mutagenesis. Error-free versus mutagenic processing of genomic uracil is relevant to cancer development. Thus, dUMP kinase is a potential target for anticancer therapy.
Neurodegenerative Diseases
Metformin, a drug used in diabetes, has been studied for its lysosomal targeting and potential repurposing in neurodegenerative diseases. Its effects on nucleotide metabolism may involve dUMP kinase activity.
Infectious Diseases
The thymidylate/uridylate kinase from Candida albicans is essential for pyrimidine metabolism and is a potential antifungal target. Its conformational diversity defines substrate specificity, making it an attractive drug target.
From dUMP kinase activity-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does knockout of dUMP kinase affect dNTP pools? | CRISPR KO cell lines |
| What is the effect of a point mutation in the active site? | Point mutation knock-in |
| Can we tag the enzyme for localization studies? | Tagged knock-in |
| What happens upon overexpression of dUMP kinase? | Overexpression cell lines |
| Which genes interact with dUMP kinase? | CRISPR library screening |
| How does dUMP kinase activity change in cancer? | Patient-derived organoids |
How to Study the dUMP kinase activity Process
| Method | What It Measures | Typical Application |
|---|---|---|
| Enzymatic assay | Kinase activity | Drug screening |
| X-ray crystallography | Protein structure | Substrate specificity |
| CRISPR KO | Gene function | dNTP pool analysis |
| RNAi knockdown | Gene knockdown | Developmental studies |
| Metabolomics | Nucleotide levels | Cancer metabolism |
| PCR amplification | dUMP incorporation | Polymerase efficiency |
| Bioconjugation | Protein cross-linking | Tool development |
Enzymatic Assays
dUMP kinase activity can be measured using coupled enzyme assays that monitor ADP production or dUDP formation. Radioactive or fluorescently labeled dUMP can be used to track the reaction.
Structural Biology
X-ray crystallography and cryo-EM can reveal the conformational changes of dUMP kinase during catalysis. Such studies have been performed on thymidylate kinase from Candida albicans and Drosophila.
Genetic Knockout and Knockdown
CRISPR/Cas9 knockout or RNAi knockdown of dUMP kinase genes can elucidate their cellular roles. Phenotypic analyses include growth assays, dNTP pool measurements, and DNA damage response.
Metabolomics
Mass spectrometry-based metabolomics can quantify nucleotide pools in cells with altered dUMP kinase activity, revealing metabolic consequences.
How CRISPR Can Be Used to Study GO:0120136 dUMP kinase activity
Knockout
CRISPR knockout of dUMP kinase genes can create cell models to study the effects of loss of function on nucleotide metabolism and DNA replication. Such models are valuable for understanding disease mechanisms.
Point Mutation
Introducing point mutations in the active site of dUMP kinase can help dissect catalytic residues and substrate specificity. This approach is useful for validating structural findings.
Knock-in
Knock-in of tagged dUMP kinase allows for localization and interaction studies. Fluorescent tags enable live-cell imaging of the enzyme.
Overexpression
Overexpression of dUMP kinase can lead to altered dNTP pools and may promote mutagenesis. Such models are useful for studying cancer-related pathways.
How EDITGENE Supports dUMP kinase activity Research
Researchers studying dUMP kinase activity-related genes often need to determine whether a candidate gene is causally involved in nucleotide metabolism, DNA replication, or disease. EDITGENE provides comprehensive CRISPR services to create precisely engineered cell models for such investigations.
Contact EDITGENE today to design your custom CRISPR model for dUMP kinase activity research.
Frequently Asked Questions About dUMP kinase activity
What is dUMP kinase activity?
dUMP kinase activity (GO:0120136) is the enzyme activity that catalyzes the phosphorylation of dUMP to dUDP using ATP.
What genes are involved in dUMP kinase activity?
Genes encoding thymidylate kinase, such as those in Drosophila and Candida albicans, are directly involved.
What is the reaction catalyzed by dUMP kinase?
The reaction is ATP + dUMP = ADP + dUDP.
Why is dUMP kinase important for DNA synthesis?
It provides dUDP, a precursor for dTTP and dUTP, which are needed for DNA replication.
How is dUMP kinase activity regulated?
It is regulated by substrate availability, energy status, and possibly post-translational modifications.
What diseases are associated with dUMP kinase dysfunction?
Cancer and fungal infections are linked to altered dUMP kinase activity.
Can dUMP kinase be targeted for drug development?
Yes, it is a potential target for anticancer and antifungal drugs.
What model organisms are used to study dUMP kinase?
Drosophila melanogaster and Candida albicans are common models.
How can CRISPR be used to study dUMP kinase?
CRISPR can create knockout, point mutation, and knock-in models to dissect gene function.
What methods measure dUMP kinase activity?
Enzymatic assays, metabolomics, and structural biology are used.
Conclusion
dUMP kinase activity (GO:0120136) is a fundamental molecular function in pyrimidine nucleotide metabolism, with critical roles in DNA synthesis and repair. Its dysregulation is linked to cancer and infectious diseases, making it a promising therapeutic target. Researchers can leverage CRISPR-based models and biochemical assays to further explore its mechanisms and develop targeted interventions.
References
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- 4. Hogrefe HH et al.. 2002. Archaeal dUTPase enhances PCR amplifications with archaeal DNA polymerases by preventing dUTP incorporation.. Proc Natl Acad Sci U S A 99(2):596-601 PMID: 11782527
- 5. Slupphaug G et al.. 1993. Low incorporation of dUMP by some thermostable DNA polymerases may limit their use in PCR amplifications.. Anal Biochem 211(1):164-9 PMID: 8323030
- 6. Sinha K et al.. 2021. Conformational diversity defines substrate specificity of thymidylate/uridylate kinase from Candida albicans.. Proteins PMID: 33682244
- 7. Seagrave J et al.. 1985. Pyrimidine nucleoside monophosphate kinase from rat bone marrow cells: purification to high specific activity by a two-step affinity chromatography procedure.. Anal Biochem 149(1):169-76 PMID: 3000212
- 8. Spampinato A et al.. 2024. ABNOH-Linked Nucleotides and DNA for Bioconjugation and Cross-linking with Tryptophan-Containing Peptides and Proteins.. Chemistry 30(49):e202402151 PMID: 38924659
