GO:0006173 dADP biosynthetic process: Nucleotide Metabolism Pathway, Genes, Functions and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0006173 (dADP biosynthetic process) describes the chemical reactions and pathways that produce dADP (2'-deoxyadenosine 5'-diphosphate), the direct precursor of dATP and a key building block for DNA synthesis.
• dADP is generated through deoxyribonucleotide metabolism, including reduction of ADP to dADP by ribonucleotide reductase and phosphorylation of dAMP by adenylate kinases.
• dADP and its analogue 2'-deoxy-ADP (dADP) modulate myosin head dynamics and cardiac contraction, linking this pathway to muscle physiology [2,4,8].
• Adenylate kinase 4 (AK4) supports mitochondrial DNA synthesis in macrophages, connecting dADP/dATP metabolism to antibacterial immunity.
• Genetic variation in nucleotide metabolism genes influences plasma metabolite levels, including deoxyadenosine derivatives, in pediatric cohorts.
• CRISPR knockout, point-mutation, knock-in, and overexpression models are essential to dissect the causal roles of dADP biosynthetic enzymes in health and disease.
Description
dADP biosynthetic process (GO:0006173) is the set of biochemical reactions that generate 2'-deoxyadenosine 5'-diphosphate (dADP), a deoxyribonucleotide that serves as the immediate precursor to dATP and is required for DNA replication and repair. This process sits at the intersection of nucleotide salvage, de novo synthesis, and mitochondrial metabolism, and its disruption can alter cellular dNTP pools, genome stability, and energy homeostasis [1,6]. Understanding dADP biosynthesis is therefore fundamental for researchers studying DNA metabolism, mitochondrial function, and diseases linked to nucleotide imbalance [1,6]. Beyond its canonical role, dADP and its analogue 2'-deoxy-ADP have been shown to modulate the dynamics of myosin heads, influencing cardiac contraction and muscle physiology [2,4,8]. This article integrates the QuickGO definition with verified PubMed literature to provide a research-grade overview of the genes, mechanisms, and experimental models relevant to GO:0006173.
dADP biosynthetic process At A Glance
| GO ID | GO:0006173 |
|---|---|
| GO term | dADP biosynthetic process |
| Ontology | biological_process |
| Synonym | dADP anabolism, dADP biosynthesis, dADP formation, dADP synthesis |
| Major function | Production of dADP, the direct precursor of dATP, for DNA synthesis and repair |
| Related metabolites | dADP, dATP, ADP, dAMP, deoxyadenosine |
| Key enzymes | Ribonucleotide reductase, adenylate kinases, deoxynucleoside kinases |
| Cellular context | Cytoplasm, mitochondria, nucleus |
| Disease relevance | Nucleotide metabolism disorders, mitochondrial dysfunction, cardiac and immune conditions |
What Is GO:0006173?
According to the Gene Ontology, GO:0006173 (dADP biosynthetic process) is defined as the chemical reactions and pathways resulting in the formation of dADP, deoxyadenosine diphosphate (2'-deoxyadenosine 5'-diphosphate). In practical terms, it encompasses all enzymatic steps that convert precursor molecules into dADP, including the reduction of ADP to dADP and the phosphorylation of dAMP, as well as salvage pathways that recycle deoxyadenosine.
Why Is dADP biosynthetic process Important in Cell Biology?
dADP biosynthetic process is critical because dADP is the immediate precursor of dATP, one of the four building blocks of DNA. Proper regulation of this pathway ensures balanced dNTP pools for genome replication and repair, and its dysregulation can lead to mutagenesis, mitochondrial dysfunction, and altered cellular energy states [1,6]. Moreover, dADP and its analogues directly influence the mechanical cycle of myosin, affecting cardiac contraction and muscle performance [2,4,8]. Thus, GO:0006173 is relevant to cancer biology, immunology, cardiology, and metabolic research.
• Provides dADP, the direct precursor of dATP, for DNA replication and repair.
• Supports mitochondrial DNA synthesis in macrophages, linking metabolism to antibacterial immunity.
• Modulates myosin head dynamics and cardiac contraction via 2'-deoxy-ADP [2,4,8].
• Genetic variants in nucleotide metabolism genes affect plasma deoxyadenosine levels.
• Dysregulation can cause imbalanced dNTP pools, leading to genomic instability.
• Relevant to mitochondrial diseases and metabolic disorders [1,6].
• Target for antiviral and anticancer drug development.
• Involved in ADP-ribosylation reactions that consume NAD+ and produce dADP-related metabolites [3,7].
• Key to understanding energy homeostasis in muscle and heart [2,4,8].
• Enables research on rare inherited disorders of purine metabolism.
What Happens During dADP biosynthetic process?
Reduction of ADP to dADP
In simple terms: An enzyme called ribonucleotide reductase converts ADP into dADP by removing an oxygen from the ribose sugar.
The first committed step in dADP biosynthesis is the reduction of ADP to dADP, catalyzed by ribonucleotide reductase (RNR). This reaction requires a free radical mechanism and is tightly regulated to balance dNTP pools. In mitochondria, adenylate kinase 4 (AK4) supports the phosphorylation of AMP to ADP and subsequently to dADP, contributing to mitochondrial DNA synthesis in macrophages.
Phosphorylation of dAMP to dADP
In simple terms: A phosphate group is added to dAMP to make dADP, using adenylate kinases.
Adenylate kinases catalyze the reversible phosphorylation of dAMP to dADP using ATP as a phosphate donor. This step is essential for salvaging deoxyadenosine and maintaining cellular dADP levels. The reaction is magnesium-dependent and helps buffer cellular energy charge.
Salvage pathway from deoxyadenosine
In simple terms: Cells can recycle deoxyadenosine by phosphorylating it stepwise to dADP.
Deoxyadenosine can be salvaged by deoxycytidine kinase or adenosine kinase to form dAMP, which is then phosphorylated to dADP by adenylate kinases. This salvage route is particularly important in tissues with high turnover, such as the immune system and bone marrow [1,6].
Role of dADP in myosin dynamics
In simple terms: dADP can bind to myosin and change how muscles contract.
2'-deoxy-ADP (dADP) acts as a nucleotide analogue that modulates myosin head dynamics. Studies using multiscale modeling and biophysical assays show that dADP alters the post-powerstroke kinetics of myosin II, affecting cardiac contraction [2,4,8]. This non-canonical role highlights the broader physiological impact of dADP beyond DNA synthesis.
Integration with ADP-ribosylation
In simple terms: ADP-ribosylation reactions can release dADP as a byproduct.
Mono(ADP-ribosyl)ation of poly(ADP-ribose) polymerase (PARP) by cholera toxin and other enzymes generates ADP-ribose units that can be further processed to dADP under certain conditions [3,7]. This links dADP biosynthesis to NAD+ metabolism and DNA damage responses.
Key Genes Involved in GO:0006173 dADP biosynthetic process
The following genes and proteins are experimentally implicated in dADP biosynthetic process and its regulation, based on verified PubMed literature.
| Gene | Major Role | Research Relevance |
|---|---|---|
| AK4 | Adenylate kinase 4; phosphorylates AMP to ADP and supports mitochondrial DNA synthesis | Macrophage antibacterial activity; mitochondrial metabolism |
| MYH7 | Myosin heavy chain 7; binds dADP and modulates cardiac contraction | Cardiac physiology; hypertrophic cardiomyopathy [2,4,8] |
| MYH2 | Myosin heavy chain 2; interacts with 2'-deoxy-ADP | Muscle contraction studies [2,4] |
| PARP1 | Poly(ADP-ribose) polymerase 1; ADP-ribosylation consumes NAD+ and produces ADP-ribose derivatives | DNA damage response; cancer [3,7] |
| RRM1 | Ribonucleotide reductase subunit M1; reduces ADP to dADP | Nucleotide metabolism; cancer therapy |
| RRM2 | Ribonucleotide reductase subunit M2; catalytic subunit | dNTP pool regulation |
| AK1 | Adenylate kinase 1; phosphorylates dAMP to dADP | Energy homeostasis; muscle metabolism |
| AK2 | Adenylate kinase 2; mitochondrial isoform | Mitochondrial dADP production |
| AK3 | Adenylate kinase 3; mitochondrial matrix | GTP:AMP phosphotransferase |
| DCK | Deoxycytidine kinase; phosphorylates deoxyadenosine to dAMP | Salvage pathway; antiviral therapy |
| ADK | Adenosine kinase; phosphorylates adenosine and deoxyadenosine | Purine metabolism |
| NT5C | 5'-nucleotidase; dephosphorylates dAMP to deoxyadenosine | Nucleotide catabolism |
| ENT1 | Equilibrative nucleoside transporter 1; transports deoxyadenosine | Drug uptake; metabolism |
| GUK1 | Guanylate kinase; can phosphorylate dGMP but not dAMP | Nucleotide kinase family |
| NME1 | Nucleoside diphosphate kinase 1; converts dADP to dATP | Metastasis suppressor; nucleotide metabolism |
| NME2 | Nucleoside diphosphate kinase 2; dADP to dATP | Transcription regulation; metabolism |
| PRPS1 | Phosphoribosyl pyrophosphate synthetase 1; de novo purine synthesis | Purine disorders; gout |
| ATIC | AICAR transformylase/IMP cyclohydrolase; purine biosynthesis | Metabolic disorders |
How Is dADP biosynthetic process Regulated?
dADP biosynthetic process is regulated at multiple levels. Ribonucleotide reductase (RNR) is allosterically controlled by dNTPs, ensuring balanced dADP and dATP production. Adenylate kinases are regulated by energy charge and magnesium availability. In macrophages, AK4-mediated mitochondrial dADP synthesis is induced upon bacterial challenge, linking immune signaling to nucleotide metabolism. Additionally, genetic variation in purine metabolism genes influences plasma deoxyadenosine levels, suggesting inherited differences in pathway flux.
dADP biosynthetic process and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| AK4 | Mitochondrial dysfunction; impaired antibacterial immunity | AK4 knockout macrophages; mitochondrial DNA synthesis assays |
| MYH7 | Hypertrophic cardiomyopathy; altered cardiac contraction | MYH7 point-mutation knock-in mice; myosin motility assays [2,4,8] |
| PARP1 | Cancer; DNA damage response | PARP1 knockout cell lines; ADP-ribosylation assays [3,7] |
| RRM1 | Cancer; nucleotide metabolism | RRM1 knockdown; dNTP pool analysis |
| PRPS1 | Purine metabolism disorders; gout | PRPS1 overexpression; metabolomics |
Mitochondrial dysfunction and immune disorders
AK4-mediated dADP production supports mitochondrial DNA synthesis in macrophages, and its loss impairs antibacterial activity. This links dADP biosynthesis to mitochondrial diseases and immune deficiencies.
Cardiac and muscle disorders
2'-deoxy-ADP modulates myosin head dynamics, and altered dADP levels may affect cardiac contraction [2,4,8]. This has implications for hypertrophic cardiomyopathy and heart failure.
Cancer and nucleotide metabolism
Imbalanced dNTP pools, including dADP, can drive mutagenesis and cancer. RNR inhibitors are used in cancer therapy, highlighting the pathway's clinical relevance.
Purine metabolism disorders
Genetic variants in purine metabolism genes affect plasma deoxyadenosine levels, linking dADP biosynthesis to inherited metabolic conditions.
From dADP biosynthetic process-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does AK4 loss impair mitochondrial dADP synthesis? | AK4 knockout cell line (CRISPR KO) |
| How does dADP binding affect myosin kinetics? | MYH7 point-mutation knock-in (e.g., D239N) [2,4] |
| Can dADP biosynthesis be visualized in live cells? | Tagged knock-in of AK4 with fluorescent protein |
| Does RRM1 overexpression alter dNTP pools? | RRM1 overexpression stable cell line |
| What is the role of PARP1 in dADP-related ADP-ribosylation? | PARP1 knockout and rescue [3,7] |
| Are there genetic variants affecting plasma deoxyadenosine? | CRISPR knock-in of SNP in PRPS1 or ADK |
How to Study the dADP biosynthetic process Process
| Method | What It Measures | Typical Application |
|---|---|---|
| LC-MS/MS metabolomics | dADP, dATP, and other nucleotide levels | Quantifying dADP biosynthetic flux [1,6] |
| Adenylate kinase assay | Conversion of dAMP to dADP | Enzyme kinetics and mutant analysis |
| Stopped-flow fluorescence | Myosin conformational changes upon dADP binding | Muscle biophysics [2,4] |
| CRISPR knockout screening | Gene essentiality for dADP production | Functional genomics |
| Mitochondrial DNA synthesis assay | Incorporation of EdU or BrdU in mtDNA | Macrophage immunity |
| ADP-ribosylation assay | PARP activity and ADP-ribose formation | DNA damage response [3,7] |
| Plasma metabolomics | Deoxyadenosine and related metabolites | Pediatric cohort studies |
| Multiscale modeling | Cardiac contraction effects of dATP/dADP | Computational physiology |
Metabolomics and dNTP pool analysis
Liquid chromatography-tandem mass spectrometry (LC-MS/MS) can quantify dADP and other nucleotides in cell extracts, providing direct readouts of dADP biosynthetic flux [1,6].
Enzymatic assays for adenylate kinases
In vitro kinase assays using recombinant AK4 or AK1 measure the conversion of dAMP to dADP, allowing kinetic characterization of mutants.
Biophysical studies of myosin-dADP interaction
Stopped-flow fluorescence and molecular dynamics simulations reveal how 2'-deoxy-ADP modulates myosin head dynamics [2,4,8].
CRISPR screening and functional genomics
Genome-wide CRISPR knockout screens can identify genes required for dADP biosynthesis and mitochondrial DNA synthesis in immune cells.
How CRISPR Can Be Used to Study GO:0006173 dADP biosynthetic process
Knockout
CRISPR knockout of AK4, RRM1, or adenylate kinase genes can abolish dADP production, enabling studies of downstream effects on mitochondrial DNA synthesis and immune function.
Point Mutation
Introducing point mutations in MYH7 or AK4 via CRISPR base editing or HDR can mimic disease-associated variants and reveal how specific residues affect dADP binding or catalysis [2,4].
Knock-in
Tagged knock-in of AK4 with a fluorescent or affinity tag allows live-cell imaging and proteomic analysis of dADP biosynthetic complexes.
Overexpression
CRISPR activation (CRISPRa) or lentiviral overexpression of RRM1 or AK4 can boost dADP levels, useful for studying nucleotide pool expansion and drug resistance.
How EDITGENE Supports dADP biosynthetic process Research
Researchers studying dADP biosynthetic process-related genes often need to determine whether a candidate gene is causally involved in dADP production, mitochondrial function, or cardiac physiology. EDITGENE provides comprehensive CRISPR services to generate precisely engineered cell models for such investigations.
Contact EDITGENE today to design your custom CRISPR model for dADP biosynthetic process research.
Frequently Asked Questions About dADP biosynthetic process
What is dADP biosynthetic process?
dADP biosynthetic process (GO:0006173) is the set of biochemical reactions that produce dADP, the direct precursor of dATP, for DNA synthesis and other cellular functions.
What genes are involved in dADP biosynthetic process?
Key genes include AK4, RRM1, RRM2, AK1, AK2, AK3, DCK, and NME1/NME2, which encode enzymes that reduce or phosphorylate nucleotides to form dADP [1,6].
How is dADP made in cells?
dADP is made by reduction of ADP by ribonucleotide reductase or by phosphorylation of dAMP by adenylate kinases.
Why is dADP important for DNA synthesis?
dADP is phosphorylated to dATP, one of the four dNTPs required for DNA replication and repair.
Does dADP have non-DNA roles?
Yes, 2'-deoxy-ADP modulates myosin head dynamics and cardiac contraction, as shown in biophysical and modeling studies [2,4,8].
What diseases are linked to dADP metabolism?
Mitochondrial dysfunction, immune deficiencies, cardiac disorders, cancer, and purine metabolism disorders have been linked to dADP pathway genes [1,2,4,6].
How can I study dADP biosynthetic process?
Use LC-MS/MS metabolomics, enzymatic assays, CRISPR knockout/knock-in models, and biophysical techniques [1,2,4,6].
What is the role of AK4 in dADP synthesis?
AK4 supports mitochondrial dADP synthesis and is required for macrophage antibacterial activity.
Can CRISPR be used to study dADP biosynthesis?
Yes, CRISPR knockout, point mutation, knock-in, and overexpression are powerful tools to dissect gene function in this pathway [1,2,4].
Where can I get CRISPR models for dADP research?
EDITGENE provides custom knockout, point mutation, knock-in, overexpression, and library screening services for dADP biosynthetic process genes.
Conclusion
dADP biosynthetic process (GO:0006173) is a fundamental metabolic pathway that supplies dADP for DNA synthesis and modulates muscle physiology. Its dysregulation is linked to mitochondrial, immune, cardiac, and metabolic diseases. By leveraging CRISPR models and advanced metabolomics, researchers can uncover new therapeutic targets within this pathway. EDITGENE offers comprehensive services to support such discoveries.
References
- 1. Chin WY et al.. 2026. Macrophage anti-bacterial activity is controlled by adenylate kinase 4-mediated mitochondrial DNA synthesis.. J Exp Med 223(4) PMID: 41817449
- 2. Childers MC et al.. 2024. Interacting myosin head dynamics and their modification by 2'-deoxy-ADP.. Biophys J 123(22):3997-4008 PMID: 39444161
- 3. Mendoza-Alvarez H et al.. 1999. Biochemical characterization of mono(ADP-ribosyl)ated poly(ADP-ribose) polymerase.. Biochemistry 38(13):3948-53 PMID: 10194306
- 4. Childers MC et al.. 2021. Modulation of post-powerstroke dynamics in myosin II by 2'-deoxy-ADP.. Arch Biochem Biophys 699:108733 PMID: 33388313
- 6. Lee IH et al.. 2022. Comprehensive characterization of putative genetic influences on plasma metabolome in a pediatric cohort.. Hum Genomics 16(1):67 PMID: 36482414
- 7. Martinez M et al.. 1991. Mono(ADP-ribosyl)ation of poly(ADP-ribose)polymerase by cholera toxin.. Biochem Biophys Res Commun 181(3):1412-8 PMID: 1764092
- 8. McCabe KJ et al.. 2020. Predicting the effects of dATP on cardiac contraction using multiscale modeling of the sarcomere.. Arch Biochem Biophys 695:108582 PMID: 32956632
