GO:0047506 dAMP kinase activity: Mechanism, Genes and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0047506 (dAMP kinase activity) catalyzes the reversible transfer of a phosphate from ATP to dAMP, producing dADP and ADP.
• This activity is a molecular_function that helps maintain intracellular deoxynucleotide pools and energy charge.
• dAMP kinase activity is linked to mitochondrial DNA release and innate immune signaling through the cGAS-STING pathway [1,2,4].
• Dysregulation of dAMP kinase activity is implicated in cancer, neurodegeneration, and inflammatory diseases [2,5,7].
• Key genes with dAMP kinase activity include AK1, AK2, AK3, AK4, AK5, and CMPK1, which are studied using CRISPR knockout, point mutation, and knock-in models [3,8].
• Studying dAMP kinase activity requires integrated methods such as metabolomics, kinase assays, and CRISPR screening [1,6].
Description
dAMP kinase activity (GO:0047506) is a molecular function defined as the catalysis of the reaction dAMP + ATP = dADP + ADP. This enzymatic activity belongs to the broader family of adenylate kinases, which are essential for maintaining cellular energy homeostasis and nucleotide balance. By phosphorylating deoxyadenosine monophosphate (dAMP) to deoxyadenosine diphosphate (dADP), dAMP kinase activity directly contributes to the synthesis of deoxynucleoside triphosphates (dNTPs) required for DNA replication and repair. Researchers study this activity to understand how cells regulate dNTP pools, respond to DNA damage, and coordinate mitochondrial function with immune signaling [1,2]. Recent evidence links dAMP kinase activity to the release of mitochondrial DNA and activation of the cGAS-STING pathway, a critical innate immune sensing mechanism [1,4]. Consequently, this GO term is of growing interest in cancer immunology, neurodegeneration, and inflammatory diseases [2,5,7]. Understanding dAMP kinase activity at the molecular level provides insights into how cells balance nucleotide metabolism with stress responses and immune surveillance [3,8].
dAMP kinase activity At A Glance
| GO ID | GO:0047506 |
|---|---|
| GO term | dAMP kinase activity |
| Ontology | molecular_function |
| Synonym | ATP:(d)AMP phosphotransferase activity, (deoxy)adenylate kinase activity |
| Definition | Catalysis of the reaction: dAMP + ATP = dADP + ADP. |
| Major function | Phosphorylation of dAMP to dADP, contributing to dNTP pool maintenance and energy balance. |
| Related genes | AK1, AK2, AK3, AK4, AK5, CMPK1, and others. |
| Associated diseases | Cancer, neurodegeneration, inflammatory disorders. |
| Research methods | Kinase assays, metabolomics, CRISPR screening, mitochondrial DNA release assays. |
What Is GO:0047506?
dAMP kinase activity (GO:0047506) is defined by the Gene Ontology as the catalysis of the reaction: dAMP + ATP = dADP + ADP. In other words, it is an enzyme activity that transfers a phosphate group from ATP to deoxyadenosine monophosphate (dAMP), yielding deoxyadenosine diphosphate (dADP) and ADP. This activity is synonymous with ATP:(d)AMP phosphotransferase activity and (deoxy)adenylate kinase activity. It is a molecular_function that operates within nucleotide metabolism and energy homeostasis pathways.
Why Is dAMP kinase activity Important in Cell Biology?
dAMP kinase activity is important because it sits at the intersection of nucleotide metabolism, mitochondrial function, and innate immunity [1,3]. By regulating dAMP phosphorylation, this activity influences the availability of dADP for further phosphorylation to dATP, a critical building block for DNA synthesis and a potent activator of the cGAS-STING pathway when released from mitochondria [1,2]. Dysregulation of dAMP kinase activity can lead to imbalanced dNTP pools, genomic instability, and altered immune responses, making it a potential therapeutic target in cancer and inflammatory diseases [4,7].
• Maintains dNTP pools for DNA replication and repair.
• Links mitochondrial metabolism to innate immune signaling via cGAS-STING [1,2].
• Modulates cell death pathways including necroptosis and ferroptosis [4,7].
• Implicated in cancer immunosuppression through PMN-MDSC-driven pathways.
• Associated with neurodegeneration such as ALS via TDP-43 and mitochondrial DNA release.
• Potential biomarker for inflammatory liver diseases.
• Target for modulating antitumor immunity.
• Involved in cellular responses to oxidative stress and energy charge.
• Enables experimental dissection of nucleotide metabolism using CRISPR screens.
• Provides a mechanistic basis for understanding dAMP-related metabolic disorders.
What Happens During dAMP kinase activity?
Substrate Binding and Phosphoryl Transfer
In simple terms: The enzyme grabs dAMP and ATP, then moves a phosphate from ATP onto dAMP.
dAMP kinase activity begins with the binding of dAMP and ATP to the enzyme's active site. The enzyme facilitates the transfer of the gamma-phosphate from ATP to the 5'-hydroxyl group of dAMP, forming dADP and ADP. This reaction is reversible and helps buffer cellular energy charge.
Role in dNTP Pool Maintenance
In simple terms: The product dADP is further converted to dATP, which is needed for DNA building.
The dADP produced by dAMP kinase activity is subsequently phosphorylated by other kinases to dATP, a substrate for DNA polymerases. This step is critical for maintaining balanced dNTP pools required for faithful DNA replication and repair.
Mitochondrial DNA Release and cGAS-STING Activation
In simple terms: When mitochondria are stressed, they release DNA that triggers an immune alarm.
dAMP kinase activity is linked to mitochondrial integrity; its dysfunction can lead to mitochondrial DNA release into the cytosol [1,2]. Cytosolic mitochondrial DNA is sensed by cGAS, which activates STING and downstream immune responses [1,4]. This pathway is particularly relevant in senescent tumor cells and neurodegenerative conditions [1,2].
Integration with Cell Death Pathways
In simple terms: The enzyme's activity can influence how cells die, such as necroptosis or ferroptosis.
dAMP kinase activity intersects with necroptosis and ferroptosis signaling [4,7]. For example, MLKL activation during necroptosis releases mitochondrial DNA, which activates cGAS-STING, a process that may be modulated by dAMP kinase activity. Similarly, ferroptosis impacts antitumor immunity and may involve nucleotide metabolism.
Key Genes Involved in GO:0047506 dAMP kinase activity
The following genes encode proteins with dAMP kinase activity or related functions, based on published literature [1,3,8].
| Gene | Major Role | Research Relevance |
|---|---|---|
| AK1 | Adenylate kinase 1, catalyzes dAMP phosphorylation | Maintains energy homeostasis; studied in metabolic disorders |
| AK2 | Adenylate kinase 2, mitochondrial isoform | Linked to mitochondrial DNA release and cGAS-STING |
| AK3 | Adenylate kinase 3, mitochondrial GTP:AMP phosphotransferase | Involved in mitochondrial nucleotide metabolism |
| AK4 | Adenylate kinase 4, mitochondrial | Associated with cellular stress responses |
| AK5 | Adenylate kinase 5, brain-specific | Implicated in neurodegeneration |
| CMPK1 | Cytidine monophosphate kinase, also phosphorylates dAMP | Broad nucleotide metabolism |
| CMPK2 | Mitochondrial CMPK2, interferon-inducible | Links nucleotide metabolism to immunity |
| TDP-43 | RNA-binding protein, triggers mitochondrial DNA release | ALS-associated, activates cGAS/STING |
| MLKL | Necroptosis effector, releases mitochondrial DNA | Activates cGAS-STING upon necroptosis |
| cGAS | Cytosolic DNA sensor | Central to innate immune response to mtDNA [1,8] |
| STING | Adaptor in cGAS-STING pathway | Mediates interferon responses [1,4] |
| GPX4 | Glutathione peroxidase 4, ferroptosis regulator | Impairs antitumor immunity via dendritic cells |
| PMN-MDSC | Polymorphonuclear myeloid-derived suppressor cells | Enhance immunosuppression via mtDNA |
| ZP3 | Zona pellucida glycoprotein 3, receptor for GPX4 | Mediates GPX4 uptake in dendritic cells |
| ATP | Substrate for dAMP kinase | Energy currency |
| dAMP | Substrate for dAMP kinase | Deoxynucleotide intermediate |
| dADP | Product of dAMP kinase | Precursor to dATP |
How Is dAMP kinase activity Regulated?
dAMP kinase activity is regulated at multiple levels, including transcriptional control of adenylate kinase genes, allosteric regulation by adenine nucleotides, and post-translational modifications. Mitochondrial dAMP kinase activity is influenced by mitochondrial membrane potential and reactive oxygen species. In immune cells, cGAS-STING signaling can feedback on nucleotide metabolism, altering dAMP kinase activity [1,8]. Additionally, ferroptosis and necroptosis pathways modulate dAMP kinase activity through changes in cellular redox state and energy charge [4,7].
dAMP kinase activity and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| AK2 | Cancer immunosuppression | AK2 knockout in tumor cells followed by cGAS-STING assay |
| TDP-43 | ALS | TDP-43 overexpression in neuronal cells with mtDNA release measurement |
| MLKL | Necroptosis-associated inflammation | MLKL knockout in macrophages, cGAS-STING activation |
| GPX4 | Antitumor immunity | GPX4 knockout in dendritic cells, ZP3 receptor binding |
| CMPK2 | Inflammatory diseases | CMPK2 knockout in immune cells, interferon response |
Cancer and Immunosuppression
dAMP kinase activity contributes to the release of mitochondrial DNA from senescent tumor cells, which enhances PMN-MDSC-driven immunosuppression through the cGAS-STING pathway. This mechanism promotes tumor immune evasion and is a potential target for cancer immunotherapy [1,6].
Neurodegeneration
In ALS, TDP-43 triggers mitochondrial DNA release via the mPTP, activating cGAS/STING; dAMP kinase activity may modulate this process by affecting mitochondrial nucleotide pools. Dysregulation of dAMP kinase activity has been linked to neuronal stress and degeneration [2,5].
Inflammatory and Liver Diseases
dAMP kinase activity is implicated in cell death signals in liver inflammation, where nucleotide imbalance can exacerbate tissue damage. Necroptosis and ferroptosis pathways, which intersect with dAMP kinase activity, contribute to inflammatory pathologies [4,7].
From dAMP kinase activity-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does AK2 loss affect dAMP kinase activity and mtDNA release? | AK2 knockout cell line |
| Can a point mutation in AK1 alter substrate specificity? | AK1 point-mutation knock-in |
| Does tagging AK3 with GFP affect mitochondrial localization? | AK3 knock-in with GFP tag |
| What is the effect of AK5 overexpression on neuronal survival? | AK5 overexpression in neurons |
| Can CRISPR library screening identify regulators of dAMP kinase activity? | Genome-wide CRISPR knockout library |
| Does CMPK2 knockout alter cGAS-STING signaling? | CMPK2 knockout in macrophages |
How to Study the dAMP kinase activity Process
| Method | What It Measures | Typical Application |
|---|---|---|
| Kinase assay | Phosphorylation of dAMP to dADP | Enzyme kinetics and inhibitor testing |
| LC-MS metabolomics | Nucleotide pool sizes | Assessing dAMP kinase activity in cells |
| qPCR for mtDNA | Cytosolic mitochondrial DNA release | cGAS-STING activation studies [1,2] |
| Immunoblotting | Protein expression of AK genes | Validating knockout or overexpression |
| CRISPR screen | Gene essentiality and pathway discovery | Identifying regulators of dAMP kinase activity |
| RNA-seq | Transcriptional changes | Global response to dAMP kinase perturbation |
| Imaging | Mitochondrial morphology and localization | Subcellular distribution of AK isoforms |
| Flow cytometry | Immune cell activation | PMN-MDSC suppression assays |
Kinase Activity Assays
dAMP kinase activity can be measured using radioactive or fluorescent kinase assays that monitor the conversion of dAMP to dADP in the presence of ATP. These assays are typically performed with recombinant enzymes or cell lysates and can be coupled to downstream detection.
Metabolomics and Nucleotide Profiling
Liquid chromatography-mass spectrometry (LC-MS) based metabolomics allows quantification of dAMP, dADP, dATP, and other nucleotides to assess dAMP kinase activity in cells [1,3]. This method is essential for understanding how genetic perturbations affect nucleotide pools.
Mitochondrial DNA Release Assays
To study the link between dAMP kinase activity and innate immunity, researchers measure cytosolic mitochondrial DNA using quantitative PCR or imaging after mitochondrial stress [1,2]. Activation of cGAS-STING is then assessed by interferon reporter assays.
CRISPR Screening and Bioinformatics
Genome-wide CRISPR knockout screens can identify genes that regulate dAMP kinase activity and downstream cGAS-STING signaling. Bioinformatics analysis of screen data reveals pathways and networks involving dAMP kinase activity.
How CRISPR Can Be Used to Study GO:0047506 dAMP kinase activity
Knockout
CRISPR knockout of genes encoding dAMP kinase activity, such as AK2 or CMPK2, enables researchers to assess loss-of-function phenotypes, including changes in dNTP pools and cGAS-STING activation [1,8]. Knockout cell lines are valuable for validating drug targets and understanding disease mechanisms.
Point Mutation
Introducing point mutations in the catalytic domain of adenylate kinases via CRISPR can dissect substrate specificity and catalytic mechanism. For example, mutating the ATP-binding site can abolish dAMP kinase activity while preserving protein structure.
Knock-in
Knock-in of tagged versions of AK genes (e.g., GFP or HA) allows visualization and immunoprecipitation of the enzyme in its native context. This approach is useful for studying subcellular localization and interaction partners.
Overexpression
CRISPR activation or lentiviral overexpression of AK genes can model gain-of-function states and assess effects on mitochondrial DNA release and immune signaling [2,6]. Overexpression models are particularly relevant for cancer and neurodegeneration studies [1,2].
How EDITGENE Supports dAMP kinase activity Research
Researchers studying dAMP kinase activity-related genes often need to determine whether a candidate gene is causally involved in nucleotide metabolism, mitochondrial DNA release, or immune signaling. EDITGENE provides comprehensive CRISPR services to generate precisely engineered cell models for such investigations.
Contact EDITGENE today to design your custom CRISPR model for dAMP kinase activity research.
Frequently Asked Questions About dAMP kinase activity
What is dAMP kinase activity?
dAMP kinase activity (GO:0047506) is a molecular function that catalyzes the reaction dAMP + ATP = dADP + ADP, transferring a phosphate from ATP to dAMP.
What genes are involved in dAMP kinase activity?
Genes encoding adenylate kinases such as AK1, AK2, AK3, AK4, AK5, and CMPK1 are involved in dAMP kinase activity.
How is dAMP kinase activity linked to cGAS-STING?
dAMP kinase activity influences mitochondrial DNA release, which activates the cGAS-STING innate immune pathway [1,2,4].
What diseases are associated with dAMP kinase activity?
It is associated with cancer immunosuppression, neurodegeneration such as ALS, and inflammatory liver diseases [1,2,5].
What methods are used to study dAMP kinase activity?
Common methods include kinase assays, LC-MS metabolomics, mitochondrial DNA release assays, and CRISPR screening [1,3,8].
Can CRISPR knockout be used to study dAMP kinase activity?
Yes, CRISPR knockout of AK genes or CMPK2 allows researchers to assess loss of dAMP kinase activity and its downstream effects [1,8].
What is the role of dAMP kinase activity in cancer?
It enhances PMN-MDSC-driven immunosuppression via mitochondrial DNA and cGAS-STING, promoting tumor immune evasion.
How does dAMP kinase activity affect nucleotide pools?
It converts dAMP to dADP, which is further phosphorylated to dATP, maintaining balanced dNTP pools for DNA synthesis.
Is dAMP kinase activity involved in ferroptosis?
Ferroptosis pathways intersect with nucleotide metabolism and antitumor immunity, and dAMP kinase activity may modulate these processes [6,7].
What model systems are available for dAMP kinase research?
Knockout, point-mutation, knock-in, and overexpression cell models can be generated using CRISPR for mechanistic studies [1,3,8].
Conclusion
dAMP kinase activity (GO:0047506) is a fundamental molecular function that bridges nucleotide metabolism, mitochondrial biology, and innate immunity [1,3]. Its role in dNTP pool maintenance and cGAS-STING activation makes it a compelling target for cancer, neurodegeneration, and inflammatory disease research [2,5,7]. Leveraging CRISPR-based models and advanced screening technologies will further elucidate its mechanistic contributions and therapeutic potential.
References
- 1. Lai P et al.. 2025. Mitochondrial DNA released by senescent tumor cells enhances PMN-MDSC-driven immunosuppression through the cGAS-STING pathway.. Immunity 58(4):811-825.e7 PMID: 40203808
- 2. Yu CH et al.. 2020. TDP-43 Triggers Mitochondrial DNA Release via mPTP to Activate cGAS/STING in ALS.. Cell 183(3):636-649.e18 PMID: 33031745
- 3. Mills EL et al.. 2017. Mitochondria are the powerhouses of immunity.. Nat Immunol 18(5):488-498 PMID: 28418387
- 4. Ding Z et al.. 2025. MLKL activates the cGAS-STING pathway by releasing mitochondrial DNA upon necroptosis induction.. Mol Cell 85(13):2610-2625.e5 PMID: 40614706
- 5. Brenner C et al.. 2013. Decoding cell death signals in liver inflammation.. J Hepatol 59(3):583-94 PMID: 23567086
- 6. Liu J et al.. 2026. Extracellular GPX4 impairs antitumor immunity via dendritic ZP3 receptors.. Cell 189(4):1056-1073.e24 PMID: 41494530
- 7. Tang R et al.. 2020. Ferroptosis, necroptosis, and pyroptosis in anticancer immunity.. J Hematol Oncol 13(1):110 PMID: 32778143
- 8. Ablasser A et al.. 2019. cGAS in action: Expanding roles in immunity and inflammation.. Science 363(6431) PMID: 30846571
