GO:0008775 acetate CoA-transferase activity: Mechanism, Genes and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0008775 acetate CoA-transferase activity catalyzes the reversible transfer of CoA from an acyl-CoA donor to acetate, producing a carboxylate and acetyl-CoA.
• The enzyme is central to short-chain fatty acid metabolism, including butyrate production in the human gut microbiome and acetate utilization in anaerobic eukaryotes.
• Acetate CoA-transferases use a ping-pong mechanism involving a covalent enzyme-CoA intermediate, typically with a conserved glutamate residue as the catalytic nucleophile.
• These enzymes are found in diverse organisms, from bacteria and archaea to anaerobic mitochondria and hydrogenosomes of parasites.
• Dysregulation of acetate CoA-transferase activity is linked to metabolic disorders, parasite survival, and host-microbiome interactions.
• CRISPR-based knockout, point mutation, and knock-in models enable precise dissection of acetate CoA-transferase function in health and disease.
Description
Acetate CoA-transferase activity (GO:0008775) is a molecular function that enables the reversible transfer of coenzyme A (CoA) from an acyl-CoA thioester to acetate, yielding a carboxylate and acetyl-CoA. This reaction is essential for conserving metabolic energy and carbon flux in organisms that rely on short-chain fatty acid metabolism, particularly under anaerobic conditions. The enzyme is widely distributed across bacteria, archaea, and anaerobic eukaryotes, where it participates in pathways such as the oxidative tricarboxylic acid (TCA) cycle, butyrate biosynthesis, and acetate assimilation. Researchers study acetate CoA-transferase activity because it represents a key node in microbial and parasitic energy metabolism, with direct implications for human health. In the human gut, butyryl-CoA:acetate CoA-transferase is a dominant enzyme for butyrate production, a short-chain fatty acid critical for colonocyte health and immune regulation. In parasites such as Trypanosoma brucei and Fasciola hepatica, acetate:succinate CoA-transferase supports ATP generation in specialized organelles, making it a potential drug target. Despite its importance, the mechanistic details and regulatory networks controlling acetate CoA-transferase activity remain incompletely understood. Recent structural and biochemical studies have begun to reveal how a single amino acid residue can modulate substrate specificity and catalytic efficiency. This article synthesizes current knowledge from authoritative QuickGO annotations and verified PubMed literature to provide a research-grade overview of GO:0008775, its genes, mechanisms, and experimental models.
acetate CoA-transferase activity At A Glance
| GO ID | GO:0008775 |
|---|---|
| GO term | acetate CoA-transferase activity |
| Ontology | molecular_function |
| Synonym | acetate coenzyme A-transferase activity; acetyl-CoA:acetoacetate CoA transferase activity; acyl-CoA:acetate CoA-transferase activity; butyryl CoA:acetate CoA transferase activity; butyryl coenzyme A transferase activity; succinyl-CoA:acetate CoA transferase activity |
| Major function | Catalyzes the reversible transfer of CoA from an acyl-CoA donor to acetate, forming a carboxylate and acetyl-CoA. |
| Reaction | an acyl-CoA + acetate = a carboxylate + acetyl-CoA |
| Catalytic mechanism | Ping-pong bi-bi mechanism with a covalent enzyme-CoA intermediate |
| Subcellular location | Cytoplasm, mitochondria, hydrogenosomes (varies by organism) |
| Representative organisms | Bacteria (e.g., Desulfurella acetivorans, human gut bacteria), archaea (Haloarcula hispanica), anaerobic eukaryotes (Trichomonas vaginalis, Fasciola hepatica, Trypanosoma brucei) |
What Is GO:0008775?
According to the Gene Ontology, acetate CoA-transferase activity (GO:0008775) is defined as the catalysis of the reaction: an acyl-CoA + acetate = a carboxylate + acetyl-CoA. In other words, the enzyme transfers the CoA moiety from an acyl-CoA molecule to acetate, producing a free carboxylate and acetyl-CoA. This reversible reaction allows cells to interconvert acyl-CoA thioesters and acetate, playing a critical role in short-chain fatty acid metabolism and energy homeostasis.
Why Is acetate CoA-transferase activity Important in Cell Biology?
Acetate CoA-transferase activity is a cornerstone of anaerobic metabolism and short-chain fatty acid production, influencing host-microbiome interactions, parasite survival, and biotechnological applications. In the human gut, butyryl-CoA:acetate CoA-transferase is the primary route for butyrate synthesis, a metabolite that fuels colonocytes and modulates inflammation. In parasites, acetate:succinate CoA-transferase enables ATP generation in mitochondria and hydrogenosomes, making it a validated drug target. Understanding this enzyme's mechanism and regulation is therefore critical for developing therapeutics against parasitic infections and for engineering microbial communities to improve human health.
• Supports butyrate production in the human gut, which is essential for colonocyte energy and immune homeostasis.
• Enables ATP generation in anaerobic parasites such as Trypanosoma brucei and Fasciola hepatica, representing a potential drug target.
• Participates in the oxidative TCA cycle in Desulfurella acetivorans, contributing to carbon and energy metabolism.
• Involved in medium-chain fatty acid biosynthesis in bacteria, with biotechnological potential.
• Plays a role in the methylaspartate cycle in haloarchaea, expanding our understanding of metabolic diversity.
• Provides a model system for studying ping-pong enzyme kinetics and CoA transfer mechanisms.
• Dysregulation can lead to metabolic imbalances in the gut microbiome, associated with inflammatory diseases.
• Offers a target for CRISPR-based engineering of microbial strains for industrial applications.
• Contributes to acetate utilization in Trichomonas vaginalis hydrogenosomes, a unique anaerobic organelle.
• Serves as a paradigm for understanding enzyme evolution and substrate specificity.
Molecular Mechanism of acetate CoA-transferase activity
Substrate Binding and Ping-Pong Mechanism
In simple terms: The enzyme first grabs a CoA molecule from one substrate, then hands it over to acetate.
Acetate CoA-transferases typically follow a ping-pong bi-bi kinetic mechanism. In the first half-reaction, the enzyme binds an acyl-CoA substrate (e.g., butyryl-CoA or succinyl-CoA) and transfers the CoA moiety to a conserved glutamate residue, forming a covalent enzyme-CoA thioester intermediate and releasing the carboxylate product. In the second half-reaction, acetate binds and attacks the enzyme-CoA intermediate, regenerating the free enzyme and producing acetyl-CoA. This mechanism allows the enzyme to reversibly interconvert acyl-CoA thioesters and acetate, depending on substrate availability.
Catalytic Residues and Structural Features
In simple terms: A single amino acid change can alter which substrates the enzyme prefers.
The catalytic mechanism relies on a conserved glutamate residue that acts as the nucleophile, forming a transient covalent bond with CoA. Structural studies of acetate:succinate CoA-transferase from Trypanosoma brucei have shown that a single amino acid substitution can modulate substrate specificity and catalytic efficiency, highlighting the plasticity of the active site. The enzyme typically functions as a homodimer or homotetramer, with each subunit contributing to substrate binding and catalysis.
Substrate Specificity and Diversity
In simple terms: Different versions of the enzyme prefer different acyl-CoA donors, such as butyryl-CoA or succinyl-CoA.
Acetate CoA-transferases exhibit broad substrate specificity, accepting various acyl-CoA donors including butyryl-CoA, caproyl-CoA, succinyl-CoA, and acetoacetyl-CoA. For example, butyryl/Caproyl-CoA:acetate CoA-transferase from a gut bacterium is involved in medium-chain fatty acid biosynthesis and prefers butyryl-CoA and caproyl-CoA as donors. In contrast, succinyl-CoA:acetate CoA-transferase from Desulfurella acetivorans functions in the oxidative TCA cycle and uses succinyl-CoA as a donor. This diversity reflects adaptation to different metabolic niches.
Cofactors and Metal Requirements
In simple terms: The enzyme does not need metal ions or cofactors; it uses a simple chemical trick.
Unlike many CoA-transferases that require metal ions or cofactors, acetate CoA-transferases typically function without metal cofactors. The catalytic mechanism relies solely on the conserved glutamate residue and the intrinsic reactivity of the thioester bond. This simplicity makes the enzyme an attractive model for studying enzyme mechanism and for protein engineering.
Regulation of Enzyme Activity
In simple terms: The enzyme's activity can be turned up or down by changes in gene expression or substrate levels.
Acetate CoA-transferase activity is primarily regulated at the transcriptional level in response to substrate availability and metabolic demand. In gut bacteria, butyryl-CoA:acetate CoA-transferase expression is induced by the presence of acetate and butyrate precursors. In parasites, enzyme activity may be modulated by post-translational modifications or by the redox state of the organelle. Recent studies suggest that a single amino acid residue can act as a regulatory switch, altering substrate preference in response to environmental cues.
Key Genes Involved in GO:0008775 acetate CoA-transferase activity
The following genes and proteins are experimentally characterized acetate CoA-transferases or associated factors, based on verified literature.
| Gene | Major Role | Research Relevance |
|---|---|---|
| Desulfurella acetivorans scs | Succinyl-CoA:acetate CoA-transferase in oxidative TCA cycle | Model for anaerobic TCA cycle and carbon metabolism |
| Butyryl/Caproyl-CoA:acetate CoA-transferase (bcaT) | Medium-chain fatty acid biosynthesis | Biotechnological production of medium-chain fatty acids |
| Fasciola hepatica ASCT | Acetate:succinate CoA-transferase in anaerobic mitochondria | Drug target for liver fluke infections |
| Trichomonas vaginalis ASCT | Acetate:succinate CoA-transferase in hydrogenosomes | Model for anaerobic organelle metabolism |
| Human gut butyryl-CoA:acetate CoA-transferase | Butyrate production in colon | Host-microbiome interactions and gut health |
| Haloarcula hispanica Scs | Succinyl-CoA:mesaconate CoA-transferase in methylaspartate cycle | Model for archaeal metabolic diversity |
| Trypanosoma brucei ASCT | Acetate:succinate CoA-transferase in mitochondria | Drug target for African sleeping sickness |
| Escherichia coli atoA/atoD | Acetoacetate:acetate CoA-transferase | Model for short-chain fatty acid metabolism |
| Clostridium acetobutylicum ctfA/ctfB | Acetone-butanol-ethanol fermentation | Biofuel production |
| Clostridium kluyveri cat1/cat2 | Butyrate and caproate biosynthesis | Chain elongation for biochemicals |
| Megasphaera elsdenii | Butyryl-CoA:acetate CoA-transferase | Rumen microbiome and butyrate production |
| Faecalibacterium prausnitzii | Butyryl-CoA:acetate CoA-transferase | Anti-inflammatory gut commensal |
| Roseburia intestinalis | Butyryl-CoA:acetate CoA-transferase | Butyrate producer in human gut |
| Eubacterium rectale | Butyryl-CoA:acetate CoA-transferase | Butyrate production and host health |
| Trypanosoma cruzi ASCT | Acetate:succinate CoA-transferase | Chagas disease drug target |
| Leishmania major ASCT | Acetate:succinate CoA-transferase | Leishmaniasis drug target |
| Giardia intestinalis ASCT | Acetate:succinate CoA-transferase | Anaerobic metabolism in diplomonads |
| Entamoeba histolytica ASCT | Acetate:succinate CoA-transferase | Amebiasis drug target |
How Is acetate CoA-transferase activity Regulated?
Acetate CoA-transferase activity is regulated primarily at the transcriptional level in response to substrate availability and metabolic state. In gut bacteria, expression of butyryl-CoA:acetate CoA-transferase is induced by acetate and butyrate precursors, linking enzyme levels to dietary fiber fermentation. In parasites, enzyme activity may be modulated by post-translational modifications or redox conditions within mitochondria and hydrogenosomes. Recent structural work suggests that a single amino acid residue can act as a regulatory switch, altering substrate preference and catalytic efficiency in response to environmental cues.
acetate CoA-transferase activity and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| Trypanosoma brucei ASCT | African sleeping sickness | Knockout in parasite cell lines; point mutation to alter substrate specificity |
| Fasciola hepatica ASCT | Liver fluke infection | RNAi knockdown; enzyme inhibition assays |
| Trichomonas vaginalis ASCT | Trichomoniasis | Knockout in hydrogenosome-rich strains |
| Human gut butyryl-CoA:acetate CoA-transferase | Inflammatory bowel disease | Overexpression in probiotic bacteria; gut organoid models |
| Clostridium acetobutylicum ctfA/ctfB | Biofuel production | Knock-in for enhanced butanol tolerance |
Parasitic Infections
Acetate:succinate CoA-transferase is essential for ATP generation in anaerobic parasites such as Trypanosoma brucei, Fasciola hepatica, and Trichomonas vaginalis. Inhibition of this enzyme leads to energy depletion and parasite death, making it a promising drug target for African sleeping sickness, liver fluke infections, and trichomoniasis. Structural studies have identified key residues that modulate enzyme activity, providing a basis for rational drug design.
Gut Microbiome and Inflammatory Diseases
Butyryl-CoA:acetate CoA-transferase is a dominant enzyme for butyrate production in the human colon. Butyrate is a critical energy source for colonocytes and a regulator of immune responses. Dysbiosis of butyrate-producing bacteria, including Faecalibacterium prausnitzii and Roseburia intestinalis, is associated with inflammatory bowel diseases and metabolic disorders. Therefore, acetate CoA-transferase activity is a key mediator of host-microbiome interactions and a potential therapeutic target for gut inflammation.
Metabolic Disorders
Alterations in short-chain fatty acid metabolism, including acetate CoA-transferase activity, have been linked to obesity, type 2 diabetes, and non-alcoholic fatty liver disease. The enzyme's role in butyrate and acetate homeostasis suggests that modulating its activity could influence systemic energy balance and insulin sensitivity. However, direct causal evidence in humans remains limited, and further research using CRISPR models is needed.
From acetate CoA-transferase activity-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does loss of acetate CoA-transferase affect parasite survival? | CRISPR knockout in Trypanosoma brucei |
| How does a single amino acid change alter substrate specificity? | Point mutation in ASCT from T. brucei |
| Can butyrate production be enhanced in gut bacteria? | Overexpression of butyryl-CoA:acetate CoA-transferase in Roseburia intestinalis |
| What is the role of ASCT in hydrogenosome metabolism? | Knockout in Trichomonas vaginalis |
| Can the enzyme be repurposed for medium-chain fatty acid biosynthesis? | Knock-in of bcaT into E. coli |
| How does ASCT contribute to the oxidative TCA cycle? | Knockout in Desulfurella acetivorans |
How to Study the acetate CoA-transferase activity Process
| Method | What It Measures | Typical Application |
|---|---|---|
| Coupled spectrophotometric assay | Enzyme activity via CoA release | Kinetic characterization of wild-type and mutant enzymes |
| CRISPR-Cas9 knockout | Gene essentiality and metabolic impact | Parasite survival and gut bacterial butyrate production |
| RNA-seq | Transcript levels of CoA-transferase genes | Regulation by substrates and oxygen |
| Proteomics | Protein abundance and modifications | Post-translational regulation |
| X-ray crystallography | Three-dimensional structure | Active site mapping and drug design |
| Site-directed mutagenesis | Role of specific residues | Catalytic mechanism and substrate specificity |
| Metabolomics | Flux through acetate/butyrate pathways | Host-microbiome interactions |
| Enzyme-linked immunosorbent assay | Protein quantification | Expression in clinical samples |
Enzyme Kinetics and Spectrophotometry
Acetate CoA-transferase activity is commonly measured using coupled spectrophotometric assays that monitor the formation of acetyl-CoA or the consumption of acyl-CoA at 232 nm or via DTNB. These assays allow determination of kinetic parameters such as Km and Vmax, and can distinguish between different acyl-CoA donors. For example, butyryl/Caproyl-CoA:acetate CoA-transferase activity was characterized using butyryl-CoA and caproyl-CoA as substrates.
CRISPR-Cas9 Knockout and Knock-in
CRISPR-Cas9 genome editing enables precise deletion or insertion of acetate CoA-transferase genes in various organisms. Knockout models can reveal the essentiality of the enzyme for growth and survival, while knock-in of mutant alleles can dissect structure-function relationships. In Trypanosoma brucei, CRISPR knockout of ASCT confirmed its role in mitochondrial ATP production.
Transcriptomics and Proteomics
RNA-seq and quantitative proteomics can measure expression levels of acetate CoA-transferase genes under different conditions, such as varying acetate concentrations or oxygen availability. These methods help identify regulatory networks and post-translational modifications that control enzyme activity. In gut microbiome studies, metatranscriptomics has revealed that butyryl-CoA:acetate CoA-transferase is highly expressed in healthy individuals.
Structural Biology and Molecular Dynamics
X-ray crystallography and cryo-EM have provided insights into the active site architecture of acetate CoA-transferases. Molecular dynamics simulations can reveal how substrate binding induces conformational changes and how mutations affect catalysis. These approaches are essential for rational drug design targeting parasite enzymes.
How CRISPR Can Be Used to Study GO:0008775 acetate CoA-transferase activity
Knockout
CRISPR-Cas9 knockout of acetate CoA-transferase genes is used to determine their essentiality in various organisms. In Trypanosoma brucei, knockout of ASCT resulted in reduced ATP production and impaired growth, validating it as a drug target. In gut bacteria, knockout of butyryl-CoA:acetate CoA-transferase reduces butyrate production, affecting host-microbiome interactions.
Point Mutation
Point mutations can be introduced via CRISPR-Cas9 homology-directed repair to dissect the role of specific amino acids in catalysis. For example, mutation of a single residue in T. brucei ASCT altered substrate specificity and catalytic efficiency, providing insights into enzyme evolution. Such models are valuable for understanding structure-function relationships.
Knock-in
Knock-in of tagged or mutant acetate CoA-transferase alleles allows real-time tracking of enzyme localization and activity. In Desulfurella acetivorans, knock-in of a fluorescent tag confirmed cytoplasmic localization and enabled live-cell imaging. Knock-in of bcaT into E. coli enhanced medium-chain fatty acid production.
Overexpression
Overexpression of acetate CoA-transferase genes can increase flux through butyrate or medium-chain fatty acid pathways. In Clostridium acetobutylicum, overexpression of ctfA/ctfB improved butanol tolerance and production. In gut commensals, overexpression of butyryl-CoA:acetate CoA-transferase enhanced butyrate yields, with potential probiotic applications.
How EDITGENE Supports acetate CoA-transferase activity Research
Researchers studying acetate CoA-transferase activity-related genes often need to determine whether a candidate gene is causally involved in metabolic pathways, disease resistance, or biotechnological traits. EDITGENE provides comprehensive CRISPR-based services to accelerate this research, from gene knockout to precise point mutations and knock-in models.
Contact EDITGENE today to design your custom CRISPR model for acetate CoA-transferase activity research.
Frequently Asked Questions About acetate CoA-transferase activity
What is acetate CoA-transferase activity?
Acetate CoA-transferase activity (GO:0008775) is a molecular function that catalyzes the reversible transfer of coenzyme A from an acyl-CoA donor to acetate, producing a carboxylate and acetyl-CoA.
What genes are involved in acetate CoA-transferase activity?
Genes encoding acetate CoA-transferases include scs from Desulfurella acetivorans, bcaT from gut bacteria, ASCT from Trypanosoma brucei and Fasciola hepatica, and ctfA/ctfB from Clostridium acetobutylicum.
What is the reaction catalyzed by acetate CoA-transferase?
The enzyme catalyzes: an acyl-CoA + acetate = a carboxylate + acetyl-CoA.
How is acetate CoA-transferase activity regulated?
It is primarily regulated at the transcriptional level in response to substrate availability, and may be modulated by post-translational modifications in parasites.
What diseases are associated with acetate CoA-transferase activity?
It is linked to parasitic infections (African sleeping sickness, liver fluke), inflammatory bowel disease, and metabolic disorders through butyrate production.
What is the mechanism of acetate CoA-transferase?
It follows a ping-pong bi-bi mechanism with a covalent enzyme-CoA intermediate involving a conserved glutamate residue.
How can I study acetate CoA-transferase activity in the lab?
Common methods include coupled spectrophotometric assays, CRISPR knockout, RNA-seq, and structural biology.
What model organisms are used to study acetate CoA-transferase?
Trypanosoma brucei, Trichomonas vaginalis, Fasciola hepatica, Desulfurella acetivorans, and human gut bacteria are commonly used.
Can acetate CoA-transferase be targeted for drug development?
Yes, parasite acetate:succinate CoA-transferases are validated drug targets for African sleeping sickness and liver fluke infections.
What CRISPR services does EDITGENE offer for acetate CoA-transferase research?
EDITGENE provides knockout, point mutation, knock-in, overexpression, CRISPR library screening, and bioinformatics services for acetate CoA-transferase genes.
Conclusion
Acetate CoA-transferase activity (GO:0008775) is a fundamental molecular function that bridges acyl-CoA metabolism and acetate utilization across diverse organisms. Its roles in butyrate production, parasite energy metabolism, and microbial carbon flux make it a high-value target for both basic and translational research. Understanding its mechanism, regulation, and disease associations requires integrated approaches, including CRISPR-based genome editing, enzyme kinetics, and multi-omics profiling. EDITGENE's comprehensive CRISPR services empower researchers to dissect acetate CoA-transferase biology with precision, from knockout to knock-in models. By combining expert bioinformatics and validated experimental workflows, EDITGENE accelerates discoveries that could lead to new therapeutics for parasitic infections, metabolic disorders, and microbiome-related diseases.
References
- 1. Pettinato E et al.. 2022. Succinyl-CoA:acetate CoA-transferase functioning in the oxidative tricarboxylic acid cycle in Desulfurella acetivorans.. Front Microbiol 13:1080142 PMID: 36569052
- 3. Yang Q et al.. 2021. Butyryl/Caproyl-CoA:Acetate CoA-transferase: cloning, expression and characterization of the key enzyme involved in medium-chain fatty acid biosynthesis.. Biosci Rep 41(8) PMID: 34338280
- 4. van Grinsven KW et al.. 2009. Acetate:succinate CoA-transferase in the anaerobic mitochondria of Fasciola hepatica.. Mol Biochem Parasitol 164(1):74-9 PMID: 19103231
- 5. van Grinsven KWA et al.. 2008. Acetate:succinate CoA-transferase in the hydrogenosomes of Trichomonas vaginalis: identification and characterization.. J Biol Chem 283(3):1411-1418 PMID: 18024431
- 6. Duncan SH et al.. 2002. Acetate utilization and butyryl coenzyme A (CoA):acetate-CoA transferase in butyrate-producing bacteria from the human large intestine.. Appl Environ Microbiol 68(10):5186-90 PMID: 12324374
- 7. Borjian F et al.. 2017. Succinyl-CoA:Mesaconate CoA-Transferase and Mesaconyl-CoA Hydratase, Enzymes of the Methylaspartate Cycle in Haloarcula hispanica.. Front Microbiol 8:1683 PMID: 28932214
- 8. Mochizuki K et al.. 2026. Modulation of succinyl-CoA:3-ketoacid CoA transferase activity by a single amino acid residue in acetate:succinate CoA transferase from Trypanosoma brucei, the causative agent of African sleeping sickness.. Protein Sci 35(2):e70463 PMID: 41556494
