GO:0004140 dephospho-CoA kinase activity: Mechanism, Genes and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0004140 (dephospho-CoA kinase activity) catalyzes the final step of coenzyme A biosynthesis: 3'-dephospho-CoA + ATP = ADP + CoA + 2 H+.
• The enzyme is essential for CoA production in bacteria, archaea, and eukaryotes, including the malaria parasite Plasmodium falciparum.
• In archaea such as Thermococcus kodakarensis, dephospho-CoA kinase can use GTP instead of ATP, revealing unexpected catalytic diversity.
• Dephospho-CoA kinase is a validated drug target in antibiotic-resistant bacteria and Leishmania parasites.
• The enzyme can be part of a bifunctional complex with pantetheine-phosphate adenylyltransferase, and its activity is regulated by protein-protein interactions such as EDC4.
• CRISPR knockout, point-mutation, knock-in, and overexpression models enable causal dissection of dephospho-CoA kinase function in health and disease.
Description
Dephospho-CoA kinase activity (GO:0004140) is the terminal enzymatic step in the biosynthesis of coenzyme A (CoA), a universal acyl-group carrier and redox cofactor. The reaction transfers the gamma-phosphate of ATP to the 3'-hydroxyl group of 3'-dephospho-CoA, yielding CoA, ADP, and two protons. Because CoA is required for fatty acid synthesis, tricarboxylic acid cycle function, and numerous post-translational modifications, the kinase is indispensable in most organisms. Researchers study this activity to understand metabolic flux, to develop antimicrobials, and to probe the evolution of enzyme catalysis. In archaea, a GTP-dependent dephospho-CoA kinase has been structurally characterized, expanding the known cofactor specificity of the enzyme family. In eukaryotes, the enzyme is often fused to or associated with other CoA biosynthetic enzymes, and its activity can be modulated by interacting proteins such as EDC4.
dephospho-CoA kinase activity At A Glance
| GO ID | GO:0004140 |
|---|---|
| GO term | dephospho-CoA kinase activity |
| Ontology | molecular_function |
| Synonym | 3'-dephospho-CoA kinase activity; ATP:dephospho-CoA 3'-phosphotransferase activity; dephosphocoenzyme A kinase activity |
| Major function | Catalyzes the final step of coenzyme A biosynthesis: phosphorylation of 3'-dephospho-CoA to CoA |
| Reaction | 3'-dephospho-CoA + ATP = ADP + CoA + 2 H+ |
| Cofactor | ATP (or GTP in some archaea) |
| Pathway | Coenzyme A biosynthesis |
| Organisms | Bacteria, archaea, eukaryotes including Plasmodium falciparum |
What Is GO:0004140?
Dephospho-CoA kinase activity (GO:0004140) is defined by the QuickGO as the catalysis of the reaction: 3'-dephospho-CoA + ATP = ADP + CoA + 2 H+. In other words, it is the enzyme activity that adds a phosphate group to 3'-dephospho-CoA, using ATP as the phosphate donor, to complete the synthesis of coenzyme A. Synonyms include 3'-dephospho-CoA kinase activity, ATP:dephospho-CoA 3'-phosphotransferase activity, and dephosphocoenzyme A kinase activity.
Why Is dephospho-CoA kinase activity Important in Cell Biology?
Dephospho-CoA kinase activity is essential because it completes the biosynthesis of coenzyme A, a molecule required for hundreds of metabolic reactions, including fatty acid oxidation, amino acid catabolism, and acetylcholine synthesis. Without this activity, cells cannot produce sufficient CoA, leading to impaired energy metabolism and growth arrest. The enzyme is also a promising target for antimicrobial drug discovery, as many pathogens rely on their own CoA biosynthetic pathway. In humans, mutations or dysregulation of CoA metabolism have been linked to neurodegeneration and metabolic disorders, although direct links to dephospho-CoA kinase require further study.
• Essential for coenzyme A biosynthesis in all domains of life.
• Required for fatty acid synthesis and oxidation, TCA cycle, and acetylcholine production.
• Validated drug target in antibiotic-resistant bacteria such as Mycobacterium tuberculosis.
• Potential target in Leishmania parasites, with computational and experimental inhibitors identified.
• Essential in Plasmodium falciparum, the malaria parasite, even after apicoplast disruption.
• Regulated by protein-protein interactions, e.g., EDC4 modulates CoA synthase dephospho-CoA kinase activity.
• Exhibits unusual GTP-dependent catalysis in hyperthermophilic archaea.
• Provides a model for studying enzyme evolution prior to aromatic residues.
• Can form bifunctional complexes with pantetheine-phosphate adenylyltransferase.
• Its activity can be measured to assess CoA pathway flux in metabolic engineering.
What Happens During dephospho-CoA kinase activity?
Substrate binding and phosphoryl transfer
In simple terms: The enzyme grabs 3'-dephospho-CoA and ATP, then moves a phosphate from ATP onto the substrate.
Dephospho-CoA kinase binds 3'-dephospho-CoA and ATP in a sequential manner. The gamma-phosphate of ATP is transferred to the 3'-hydroxyl group of the ribose moiety of 3'-dephospho-CoA, forming CoA and ADP. This reaction requires divalent metal ions, typically Mg2+, for ATP coordination.
Product release and proton balance
In simple terms: After the phosphate is added, the enzyme releases CoA and ADP, along with two protons.
The catalytic cycle concludes with the release of CoA, ADP, and two protons, as indicated by the reaction equation. The protons are likely released due to the deprotonation of the 3'-hydroxyl group during phosphoryl transfer. In some archaea, the enzyme uses GTP instead of ATP, and the reaction may proceed with similar chemistry.
Role in the CoA biosynthetic pathway
In simple terms: This is the last step in making coenzyme A, a vital helper molecule in metabolism.
Dephospho-CoA kinase catalyzes the final step of the CoA biosynthetic pathway, converting 3'-dephospho-CoA to CoA. In bacteria, the pathway typically starts from pantothenate and proceeds through five enzymatic steps, with dephospho-CoA kinase acting last. In archaea, the pathway can differ, but the final step remains conserved.
Bifunctional complex formation
In simple terms: Sometimes this enzyme works together with another enzyme in a single complex.
In some organisms, dephospho-CoA kinase forms a bifunctional complex with pantetheine-phosphate adenylyltransferase, the preceding enzyme in the pathway. This complex may facilitate substrate channeling, increasing pathway efficiency. The interaction between the two enzymes has been purified and characterized biochemically.
Key Genes Involved in GO:0004140 dephospho-CoA kinase activity
The following genes and proteins are directly involved in dephospho-CoA kinase activity or its regulation across model organisms.
| Gene | Major Role | Research Relevance |
|---|---|---|
| coaE (bacteria) | Encodes dephospho-CoA kinase | Essential for CoA biosynthesis; drug target in M. tuberculosis |
| TK2141 (Thermococcus kodakarensis) | GTP-dependent dephospho-CoA kinase | Model for archaeal CoA pathway and enzyme evolution |
| PfCoaE (Plasmodium falciparum) | Apicoplast-targeted dephospho-CoA kinase | Essential for parasite survival; malaria drug target |
| COASY (human) | Bifunctional enzyme with dephospho-CoA kinase and PPAT activities | Mutations cause CoA synthase deficiency; regulated by EDC4 |
| EDC4 (human) | Enhancer of mRNA-decapping protein 4 | Interacts with and regulates dephospho-CoA kinase activity of COASY |
| Leishmania CoaE | Dephospho-CoA kinase | Target for anti-leishmanial drug discovery |
| E. coli coaE | Dephospho-CoA kinase | Model for bifunctional complex with PPAT |
| PPAT (human) | Pantetheine-phosphate adenylyltransferase | Forms bifunctional complex with dephospho-CoA kinase in COASY |
| Dephospho-CoA kinase (archaeal) | GTP-dependent kinase | Structural and mechanistic studies |
| CoA synthase (bifunctional) | Fused PPAT and dephospho-CoA kinase | Regulation by EDC4; disease relevance |
| coaE (M. tuberculosis) | Dephospho-CoA kinase | Antibiotic target |
| PfCoaE (apicoplast) | Dephospho-CoA kinase | Remains active after apicoplast disruption |
| TkCoaE | Thermococcus kodakarensis dephospho-CoA kinase | Crystal structure solved |
| Human COASY | CoA synthase | Neurodegeneration with brain iron accumulation (NBIA) |
| Dephospho-CoA kinase (ancestral) | Reconstructed ancestral enzyme | Study of catalysis prior to aromatic residues |
| CoaE (Leishmania) | Dephospho-CoA kinase | Computational and experimental inhibitor studies |
| Bacterial coaE | Dephospho-CoA kinase | Essential gene; knockout studies |
How Is dephospho-CoA kinase activity Regulated?
Dephospho-CoA kinase activity is regulated at multiple levels. In humans, the bifunctional COASY protein is regulated by interaction with EDC4, which modulates its dephospho-CoA kinase activity. In bacteria, the enzyme is part of a bifunctional complex with PPAT, which may influence substrate channeling and pathway flux. In Plasmodium falciparum, the enzyme remains active and essential even after apicoplast disruption, suggesting post-translational or compensatory regulation. In archaea, the use of GTP instead of ATP may reflect adaptation to high-temperature environments and metabolic regulation.
dephospho-CoA kinase activity and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| COASY | CoA synthase deficiency; neurodegeneration with brain iron accumulation | Knock-in mouse models with patient mutations; patient-derived iPSCs |
| coaE (M. tuberculosis) | Tuberculosis; antibiotic resistance | Bacterial knockout and inhibitor screening |
| PfCoaE | Malaria; apicoplast disruption | Parasite knockout and conditional knockdown |
| Leishmania CoaE | Leishmaniasis | Parasite knockout and drug testing |
| EDC4 | RNA metabolism; regulation of CoA synthase | Knockout cell lines and interaction studies |
Infectious diseases: bacterial and parasitic infections
Dephospho-CoA kinase is essential for CoA biosynthesis in many pathogens, making it a promising antimicrobial target. In Mycobacterium tuberculosis, the enzyme is required for growth and survival, and inhibitors are being developed. In Leishmania parasites, computational and experimental studies have identified small molecules that target dephospho-CoA kinase, showing anti-leishmanial activity. In Plasmodium falciparum, the enzyme remains essential even when the apicoplast is disrupted, highlighting its potential as an antimalarial target.
Metabolic and neurodegenerative disorders
In humans, the bifunctional COASY enzyme contains dephospho-CoA kinase activity. Mutations in COASY cause CoA synthase deficiency, a rare neurodegenerative disorder with brain iron accumulation. The interaction between COASY and EDC4 further links dephospho-CoA kinase activity to RNA metabolism and cellular stress responses. While direct mutations in the dephospho-CoA kinase domain are less characterized, impaired CoA synthesis can affect energy metabolism and neuronal survival.
Cancer and metabolic reprogramming
Altered CoA metabolism has been observed in cancer cells, where increased fatty acid synthesis and acetyl-CoA demand may upregulate CoA biosynthetic enzymes. Although direct evidence for dephospho-CoA kinase in cancer is limited, its role in producing CoA makes it a potential target for metabolic inhibitors. Further research using CRISPR knockout models could clarify its contribution to tumor growth.
From dephospho-CoA kinase activity-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Is dephospho-CoA kinase essential for bacterial growth? | CRISPR knockout in M. tuberculosis or E. coli |
| Does the enzyme use GTP instead of ATP in archaea? | Point mutations in TkCoaE and kinetic assays |
| Can human COASY mutations cause neurodegeneration? | Knock-in mice expressing mutant COASY |
| How does EDC4 regulate dephospho-CoA kinase activity? | Knockout of EDC4 in human cell lines and CoA synthase activity assays |
| Is PfCoaE essential after apicoplast disruption? | Conditional knockout in P. falciparum |
| Can Leishmania CoaE be targeted by small molecules? | Overexpression and knockout in Leishmania for drug screening |
How to Study the dephospho-CoA kinase activity Process
| Method | What It Measures | Typical Application |
|---|---|---|
| Coupled kinase assay | ADP production or CoA formation | Kinetic characterization and inhibitor screening |
| X-ray crystallography | Three-dimensional structure | Active site mapping and drug design |
| CRISPR knockout | Gene essentiality | Target validation in pathogens |
| Conditional knockdown | Protein depletion effects | Essential gene studies in Plasmodium |
| Molecular docking | Binding affinity of inhibitors | Virtual screening for anti-leishmanial drugs |
| Ancestral sequence reconstruction | Evolutionary intermediates | Study of enzyme catalysis prior to aromatic residues |
| Co-immunoprecipitation | Protein-protein interactions | Identification of EDC4-COASY interaction |
| Bifunctional complex purification | Enzyme complex formation | Characterization of PPAT-dephospho-CoA kinase complex |
Enzymatic activity assays
Dephospho-CoA kinase activity is typically measured using coupled enzyme assays that monitor ADP production or CoA formation. Radioactive or fluorescent substrates can be used to quantify kinase activity in cell lysates or purified protein preparations. These assays are essential for kinetic characterization and inhibitor screening.
Structural biology
X-ray crystallography and cryo-EM have been used to solve the structure of dephospho-CoA kinase from Thermococcus kodakarensis, revealing the GTP-binding pocket and catalytic residues. Structural studies guide the design of specific inhibitors and help understand substrate specificity.
Genetic knockout and knockdown
CRISPR-Cas9 knockout of coaE in bacteria or Plasmodium parasites can determine essentiality. Conditional knockdown using auxin-inducible degrons allows study of essential genes in eukaryotes. These methods link genotype to phenotype and validate drug targets.
Computational and bioinformatics approaches
Homology modeling, molecular docking, and molecular dynamics simulations are used to identify novel inhibitors of dephospho-CoA kinase, as demonstrated for Leishmania. Phylogenetic analysis helps trace the evolutionary history of the enzyme, including ancestral reconstruction.
How CRISPR Can Be Used to Study GO:0004140 dephospho-CoA kinase activity
Knockout
CRISPR knockout of dephospho-CoA kinase genes (e.g., coaE in bacteria, PfCoaE in Plasmodium) can determine whether the enzyme is essential for growth and survival. Knockout cell lines are valuable for testing drug specificity and for metabolic rescue experiments with exogenous CoA.
Point Mutation
Point mutations in catalytic residues or ATP-binding motifs can dissect the mechanism of phosphoryl transfer and cofactor specificity. For example, mutations in the GTP-binding pocket of TkCoaE can switch cofactor preference. Such models help validate inhibitor binding sites.
Knock-in
Knock-in of disease-associated mutations in COASY (e.g., those causing CoA synthase deficiency) into human cell lines or mice can model neurodegeneration and test therapeutic strategies. Tagged knock-in (e.g., GFP or HA) allows localization and interaction studies.
Overexpression
Overexpression of dephospho-CoA kinase can increase CoA levels, which is useful for metabolic engineering and for studying pathway flux. In parasites, overexpression can test for dominant-negative effects or resistance to inhibitors.
How EDITGENE Supports dephospho-CoA kinase activity Research
Researchers studying dephospho-CoA kinase activity-related genes often need to determine whether a candidate gene is causally involved in CoA metabolism, pathogen survival, or human disease. EDITGENE provides custom CRISPR cell models and screening services to accelerate this research.
Contact EDITGENE today to design your custom CRISPR model for dephospho-CoA kinase activity research.
Frequently Asked Questions About dephospho-CoA kinase activity
What is dephospho-CoA kinase activity?
Dephospho-CoA kinase activity (GO:0004140) is the enzyme activity that catalyzes the final step of coenzyme A biosynthesis: the phosphorylation of 3'-dephospho-CoA to CoA using ATP.
What genes are involved in dephospho-CoA kinase activity?
Key genes include coaE in bacteria, COASY in humans, PfCoaE in Plasmodium falciparum, and Tk2141 in Thermococcus kodakarensis.
What is the reaction catalyzed by dephospho-CoA kinase?
The reaction is: 3'-dephospho-CoA + ATP = ADP + CoA + 2 H+.
Why is dephospho-CoA kinase important for drug discovery?
It is essential for CoA biosynthesis in many pathogens, making it a target for antibiotics and antiparasitic drugs.
Can dephospho-CoA kinase use GTP instead of ATP?
Yes, in some archaea such as Thermococcus kodakarensis, the enzyme is GTP-dependent.
How is dephospho-CoA kinase activity regulated?
It can be regulated by protein-protein interactions, such as with EDC4, and by forming bifunctional complexes with PPAT.
What diseases are linked to dephospho-CoA kinase?
Mutations in COASY cause CoA synthase deficiency and neurodegeneration; the enzyme is also essential in malaria and leishmaniasis parasites.
How can I study dephospho-CoA kinase activity in the lab?
Common methods include coupled kinase assays, CRISPR knockout, structural biology, and computational docking.
Is dephospho-CoA kinase essential in Plasmodium falciparum?
Yes, it remains active and essential even after apicoplast disruption.
What CRISPR models are available for dephospho-CoA kinase research?
Knockout, point mutation, knock-in, and overexpression models can be generated in various cell types to study function and drug response.
Conclusion
Dephospho-CoA kinase activity (GO:0004140) is a critical enzymatic step in coenzyme A biosynthesis, with essential roles in metabolism, pathogen survival, and human disease. Its unique catalytic mechanism, regulation by protein interactions, and potential as a drug target make it a compelling subject for research. CRISPR-based models and advanced biochemical assays continue to uncover its functions, offering new opportunities for therapeutic intervention.
References
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- 2. Swift RP et al.. 2021. Dephospho-CoA kinase, a nuclear-encoded apicoplast protein, remains active and essential after Plasmodium falciparum apicoplast disruption.. EMBO J 40(16):e107247 PMID: 34031901
- 3. Makarov M et al.. 2021. Enzyme catalysis prior to aromatic residues: Reverse engineering of a dephospho-CoA kinase.. Protein Sci 30(5):1022-1034 PMID: 33739538
- 4. Gudkova D et al.. 2012. EDC4 interacts with and regulates the dephospho-CoA kinase activity of CoA synthase.. FEBS Lett 586(20):3590-5 PMID: 22982864
- 5. Kita A et al.. 2024. Crystal structure of GTP-dependent dephospho-coenzyme A kinase from the hyperthermophilic archaeon, Thermococcus kodakarensis.. Proteins 92(6):768-775 PMID: 38235908
- 6. Gupta A et al.. 2021. Phosphopantetheine Adenylyltransferase: A promising drug target to combat antibiotic resistance.. Biochim Biophys Acta Proteins Proteom 1869(2):140566 PMID: 33271445
- 7. Worrall DM et al.. 1983. A bifunctional enzyme complex in coenzyme A biosynthesis: purification of pantetheine phosphate adenylyltransferase and dephospho-CoA kinase.. Biochem J 215(1):153-7 PMID: 6312972
- 8. Menpadi N et al.. 2023. Integrated computational and experimental approach for novel anti-leishmanial molecules by targeting Dephospho-coenzyme A kinase.. Int J Biol Macromol 232:123441 PMID: 36708902
