GO:0120225 coenzyme A binding: Mechanism, Genes and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0120225 (coenzyme A binding) is a molecular function describing the binding of proteins to coenzyme A (CoA), an essential acyl carrier in acylation and acyl-transfer reactions.
• CoA binding proteins are structurally diverse, including enzymes such as choline acetyltransferase, ATP-citrate lyase, and NME1, which use distinct folds to recognize the CoA nucleotide moiety.
• CoA binding is critical for intermediary metabolism, lipid synthesis, and post-translational modifications, with direct implications for cancer, neurodegeneration, and infectious diseases.
• Magnesium ions can modulate CoA binding, influencing the conformation and reactivity of the cofactor in enzymatic reactions.
• TMEM120A was identified as a specific CoA-binding protein, challenging its proposed role as a mechanosensitive channel and highlighting new functions for CoA binding.
• CRISPR-based knockout, point mutation, and knock-in models are powerful tools to dissect the causal roles of CoA-binding proteins in cellular physiology and disease.
Description
Coenzyme A (CoA) is a ubiquitous cofactor that serves as an acyl carrier in numerous metabolic reactions, forming thioester intermediates that are central to energy metabolism and biosynthesis. The binding of CoA to proteins is a fundamental molecular event that enables enzymes to catalyze acyl-transfer reactions, and this function is captured by the Gene Ontology term GO:0120225 (coenzyme A binding). Understanding how proteins recognize and bind CoA is essential for deciphering metabolic regulation and for developing therapeutic strategies targeting these interactions. CoA-binding proteins are involved in diverse pathways, from acetylcholine synthesis in neurotransmission to fatty acid metabolism and triglyceride biosynthesis. Recent studies have revealed unexpected CoA-binding proteins, such as TMEM120A, expanding the functional repertoire of this molecular function. Moreover, small molecules like pyrazinoic acid can inhibit CoA biosynthesis by targeting binding steps, underscoring the druggability of CoA-binding interfaces. This article provides a comprehensive overview of GO:0120225, integrating structural, biochemical, and genetic evidence from authoritative literature.
coenzyme A binding At A Glance
| GO ID | GO:0120225 |
|---|---|
| GO term | coenzyme A binding |
| Ontology | molecular_function |
| Synonym | CoA binding |
| Definition | Binding to coenzyme A, 3'-phosphoadenosine-(5')diphospho(4')pantatheine, an acyl carrier in many acylation and acyl-transfer reactions in which the intermediate is a thiol ester. |
| Major function | Mediates protein-coenzyme A interactions essential for acyl transfer, metabolism, and post-translational modifications. |
| Related cofactor | Coenzyme A (CoA) |
| Structural features | Proteins employ diverse folds to bind the nucleotide and pantetheine moieties of CoA. |
What Is GO:0120225?
GO:0120225 (coenzyme A binding) is defined as the binding to coenzyme A, 3'-phosphoadenosine-(5')diphospho(4')pantatheine, an acyl carrier in many acylation and acyl-transfer reactions in which the intermediate is a thiol ester. In simpler terms, it is the molecular function of physically interacting with CoA, a cofactor that carries acyl groups during enzymatic reactions.
Why Is coenzyme A binding Important in Cell Biology?
Coenzyme A binding is a central molecular function that underpins cellular metabolism, signaling, and gene regulation. Proteins that bind CoA participate in pathways ranging from acetylcholine biosynthesis and fatty acid oxidation to the regulation of gene expression via acetylation. Dysregulation of CoA-binding proteins has been linked to cancer, metabolic disorders, and neurodegenerative diseases, making them attractive targets for therapeutic intervention. The identification of new CoA-binding proteins, such as TMEM120A, continues to expand our understanding of CoA biology and its integration with diverse cellular processes.
• CoA binding is essential for the catalytic activity of numerous enzymes involved in intermediary metabolism.
• It enables the transfer of acyl groups in biosynthetic and degradative pathways, including fatty acid synthesis and oxidation.
• CoA-binding proteins such as choline acetyltransferase are critical for neurotransmitter synthesis and neuronal function.
• The human metastasis suppressor NME1 binds CoA in a unique mode, linking CoA binding to cancer progression.
• ATP-citrate lyase requires CoA binding for its catalytic activity, connecting CoA to histone acetylation and gene regulation.
• Magnesium ions influence CoA binding, affecting enzyme kinetics and metabolic flux.
• TMEM120A, a newly identified CoA-binding protein, may have roles beyond mechanosensation, impacting lipid metabolism.
• Inhibitors of CoA biosynthesis, such as pyrazinoic acid, highlight the potential of targeting CoA-binding steps in infectious diseases.
• CoA binding is implicated in triglyceride biosynthesis through alternative pathways, relevant to obesity and metabolic syndrome.
• Understanding CoA binding at the molecular level informs drug design and metabolic engineering strategies.
Mechanism, Genes and Research Methods
What Happens During coenzyme A binding?
In simple terms: Coenzyme A binding is the first step in many reactions where CoA acts as a carrier of acyl groups.
During coenzyme A binding, a protein recognizes and non-covalently interacts with CoA, primarily through the nucleotide moiety (3'-phosphoadenosine) and the pantetheine arm. This binding positions the reactive thiol group of CoA for acyl transfer, enabling the formation of thioester intermediates. Structural studies have revealed that CoA-binding proteins utilize diverse folds, such as the Rossmann fold or specific nucleotide-binding pockets, to achieve high affinity and specificity. For example, human NME1 binds CoA in a unique mode within its nucleotide-binding pocket, which may regulate its metastasis suppressor function. Magnesium ions can modulate CoA binding by coordinating with the phosphate groups, influencing the conformation and reactivity of the cofactor.
Structural Basis of CoA Recognition
In simple terms: Proteins have specific pockets that fit the shape and chemistry of CoA.
The structural basis of CoA recognition varies among proteins. Choline acetyltransferase, a key enzyme in acetylcholine synthesis, binds CoA through a domain that accommodates the adenosine and pantetheine moieties, facilitating acetyl transfer. ATP-citrate lyase requires multimerization for CoA substrate binding and catalysis, indicating that quaternary structure regulates CoA interaction. TMEM120A contains a specific CoA-binding site, and mutations in this site abolish CoA binding, suggesting a dedicated pocket. These examples illustrate that CoA binding is mediated by a combination of hydrogen bonding, electrostatic interactions, and hydrophobic contacts, tailored to each protein's function.
Cellular Roles of CoA-Binding Proteins
In simple terms: CoA-binding proteins do many jobs in cells, from making fats to controlling genes.
CoA-binding proteins participate in a wide array of cellular processes. In lipid metabolism, they are involved in fatty acid synthesis and degradation, as well as in alternative triglyceride biosynthesis pathways. In neurotransmission, choline acetyltransferase binds CoA to produce acetylcholine. In gene regulation, ATP-citrate lyase generates acetyl-CoA for histone acetylation, linking metabolism to chromatin modification. NME1, a metastasis suppressor, binds CoA, implicating CoA in cancer cell signaling. The diversity of these roles underscores the importance of CoA binding in cellular physiology.
Regulation of CoA Binding
In simple terms: Cells control when and how proteins bind CoA to meet metabolic demands.
Regulation of CoA binding can occur at multiple levels. Post-translational modifications, such as phosphorylation, may alter the affinity of proteins for CoA. The availability of CoA itself is regulated by biosynthesis and degradation pathways, and enzymes like PanD are targets for inhibition by pyrazinoic acid, affecting CoA levels. Magnesium ions can modulate CoA binding by influencing the conformation of the cofactor. Additionally, protein multimerization, as seen with ATP-citrate lyase, can be required for efficient CoA binding and catalysis. These regulatory mechanisms ensure that CoA-dependent processes are tightly controlled.
CoA Binding in Disease and Therapeutics
In simple terms: When CoA binding goes wrong, it can lead to diseases, so scientists are designing drugs to target it.
Dysregulation of CoA binding is associated with various diseases. In cancer, NME1's CoA binding may influence metastasis, and ATP-citrate lyase is a target for cancer therapy. In metabolic disorders, alternative triglyceride biosynthesis involving CoA-binding proteins contributes to lipid accumulation. In infectious diseases, inhibition of CoA biosynthesis in Mycobacterium tuberculosis by pyrazinoic acid highlights the potential of targeting CoA-binding steps. These examples demonstrate the therapeutic relevance of understanding CoA binding at the molecular level.
Key Genes Involved in GO:0120225 coenzyme A binding
The following genes encode proteins that bind coenzyme A and are representative of the diverse functions associated with GO:0120225.
| Gene | Major Role | Research Relevance |
|---|---|---|
| CHAT | Binds CoA to synthesize acetylcholine | Neurotransmission; Alzheimer's disease research |
| ACLY | Binds CoA for acetyl-CoA production | Cancer metabolism; histone acetylation |
| NME1 | Binds CoA in nucleotide pocket | Metastasis suppression; cancer |
| TMEM120A | Specific CoA-binding protein | Mechanosensation; lipid metabolism |
| PANK1 | Phosphorylates pantothenate in CoA biosynthesis | CoA biosynthesis regulation |
| PANK2 | Phosphorylates pantothenate in CoA biosynthesis | Neurodegeneration (PKAN) |
| PANK3 | Phosphorylates pantothenate in CoA biosynthesis | CoA homeostasis |
| COASY | Bifunctional enzyme in CoA biosynthesis | CoA biosynthesis; neurodegeneration |
| PPCS | Phosphopantothenoylcysteine synthetase | CoA biosynthesis |
| PPCDC | Phosphopantothenoylcysteine decarboxylase | CoA biosynthesis |
| PPAT | Phosphopantetheine adenylyltransferase | CoA biosynthesis |
| DPCK | Dephospho-CoA kinase | CoA biosynthesis |
| ACACA | Acetyl-CoA carboxylase, binds CoA | Fatty acid synthesis |
| ACACB | Acetyl-CoA carboxylase, binds CoA | Fatty acid oxidation |
| FASN | Fatty acid synthase, uses CoA | Lipid metabolism |
| CPT1A | Carnitine palmitoyltransferase, binds CoA | Fatty acid oxidation |
| HADHA | Trifunctional enzyme, binds CoA | Fatty acid oxidation |
| PDHA1 | Pyruvate dehydrogenase, binds CoA | Energy metabolism |
How Is coenzyme A binding Regulated?
Regulation of coenzyme A binding occurs through multiple mechanisms. The intracellular concentration of CoA is controlled by biosynthesis and degradation, affecting the availability of the ligand for binding. Post-translational modifications, such as phosphorylation, can modulate the affinity of proteins for CoA; for instance, NME1's CoA binding may be influenced by its phosphorylation state. Magnesium ions can bind to CoA and alter its conformation, thereby affecting protein-CoA interactions. Protein multimerization, as demonstrated for ATP-citrate lyase, is required for efficient CoA substrate binding and catalysis, adding another layer of regulation. These regulatory mechanisms ensure that CoA-dependent processes are responsive to cellular metabolic demands.
coenzyme A binding and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| NME1 | Cancer metastasis | Knockout and point mutation in cancer cell lines |
| ACLY | Cancer metabolism | Knockout in cancer cells; metabolic assays |
| CHAT | Alzheimer's disease | Knockout in neuronal cells; acetylcholine measurement |
| PANK2 | Neurodegeneration (PKAN) | Knock-in of patient mutations in iPSCs |
| TMEM120A | Lipid metabolism | Knockout in adipocytes; lipid profiling |
Cancer
CoA-binding proteins play significant roles in cancer. NME1, a metastasis suppressor, binds CoA in a unique mode, and this interaction may regulate its anti-metastatic activity. ATP-citrate lyase, which requires CoA binding for catalysis, is a key enzyme in cancer metabolism and is targeted for therapeutic inhibition. Dysregulated lipid metabolism involving CoA-binding enzymes, such as the alternative triglyceride biosynthesis pathway, contributes to cancer cell survival. These findings highlight CoA binding as a potential target in oncology.
Neurodegeneration
CoA binding is critical for neuronal function. Choline acetyltransferase binds CoA to produce acetylcholine, a neurotransmitter essential for memory and cognition; its dysfunction is linked to Alzheimer's disease. Mutations in genes involved in CoA biosynthesis, such as PANK2, cause neurodegeneration with brain iron accumulation (PKAN), underscoring the importance of CoA homeostasis in the nervous system. Although not directly cited here, the role of CoA binding in these pathways is well established.
Infectious Diseases
CoA biosynthesis is essential for many pathogens. In Mycobacterium tuberculosis, the enzyme PanD binds CoA precursors, and pyrazinoic acid inhibits this step by binding to PanD, disrupting CoA biosynthesis. This demonstrates that targeting CoA-binding events can be an effective antimicrobial strategy. Understanding the structural basis of CoA binding in pathogens can guide drug development.
Metabolic Disorders
CoA-binding proteins are involved in lipid metabolism. The alternative triglyceride biosynthesis pathway, which requires CoA-binding enzymes, contributes to fat storage and is implicated in obesity and metabolic syndrome. TMEM120A, a CoA-binding protein, may also play a role in lipid metabolism, although its exact function is still under investigation. These connections suggest that modulating CoA binding could have therapeutic potential for metabolic diseases.
From coenzyme A binding-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does loss of CoA binding affect enzyme activity? | Knockout of the CoA-binding protein followed by enzymatic assays |
| Does a specific point mutation in the CoA-binding pocket alter substrate affinity? | Point mutation knock-in using CRISPR |
| Can a tag be used to track CoA-binding protein localization? | Tagged knock-in (e.g., GFP) at the endogenous locus |
| Does overexpression of a CoA-binding protein drive metabolic changes? | Overexpression via lentiviral transduction |
| Which genes are essential for CoA-dependent pathways? | CRISPR library screening |
| How does CoA binding regulate gene expression? | Knockout combined with RNA-seq and ChIP-seq |
How to Study the coenzyme A binding Process
| Method | What It Measures | Typical Application |
|---|---|---|
| X-ray crystallography | 3D structure of protein-CoA complex | Determining binding mode |
| Isothermal titration calorimetry | Binding affinity (Kd) | Quantifying CoA binding |
| Enzymatic assays | Catalytic activity | Assessing functional impact of CoA binding |
| CRISPR knockout | Loss of protein function | Studying cellular roles |
| RNA-seq | Transcriptome changes | Identifying pathways regulated by CoA-binding proteins |
| Metabolomics | Metabolite levels | Measuring CoA and acyl-CoA pools |
| Proteomics | Protein expression and modifications | Global effects of CoA-binding perturbations |
Structural Biology
X-ray crystallography and cryo-electron microscopy are used to determine the atomic structures of CoA-binding proteins, revealing the molecular details of the binding pocket and interactions with CoA. These methods provide insights into how mutations affect binding affinity and specificity.
Biochemical Assays
Isothermal titration calorimetry (ITC) and surface plasmon resonance (SPR) measure the binding affinity between proteins and CoA. Enzymatic assays monitor acyl-transfer reactions to assess the functional consequences of CoA binding.
CRISPR-Cas9 Genome Editing
CRISPR-Cas9 is used to generate knockout, point mutation, and knock-in cell models to study the physiological roles of CoA-binding proteins. These models enable loss-of-function and gain-of-function studies in relevant cell types.
Omics Approaches
RNA-seq and proteomics can reveal global changes in gene expression and protein abundance upon perturbation of CoA-binding proteins. Metabolomics quantifies CoA and its derivatives, linking binding events to metabolic flux.
How CRISPR Can Be Used to Study GO:0120225 coenzyme A binding
Knockout
CRISPR knockout of genes encoding CoA-binding proteins, such as ACLY or NME1, allows researchers to study the loss-of-function phenotypes in cancer cell lines and primary cells. Knockout models can reveal whether CoA binding is essential for cell proliferation, metabolism, and survival.
Point Mutation
Introducing point mutations in the CoA-binding pocket (e.g., in NME1 or TMEM120A) via CRISPR can dissect the specific contribution of CoA binding to protein function without affecting overall protein stability. Such models are valuable for validating structural predictions.
Knock-in
Knock-in of tagged versions (e.g., GFP or HA) of CoA-binding proteins enables real-time imaging and proteomic analysis of endogenous protein interactions. Knock-in of disease-associated mutations (e.g., in PANK2) can model human disorders in iPSCs or organoids.
Overexpression
Overexpression of CoA-binding proteins using CRISPR activation (CRISPRa) or lentiviral vectors can uncover gain-of-function effects on metabolism and gene expression. This approach is useful for identifying downstream pathways regulated by CoA binding.
How EDITGENE Supports coenzyme A binding Research
Researchers studying coenzyme A binding-related genes often need to determine whether a candidate gene is causally involved in a specific metabolic or disease pathway. EDITGENE provides comprehensive CRISPR-based services to generate precisely engineered cell models, enabling functional validation of CoA-binding proteins.
Contact EDITGENE today to design your custom CRISPR model for coenzyme A binding research.
Frequently Asked Questions About coenzyme A binding
What is coenzyme A binding?
Coenzyme A binding (GO:0120225) is a molecular function where a protein interacts with coenzyme A (CoA), an acyl carrier involved in many acylation and acyl-transfer reactions.
What genes are involved in coenzyme A binding?
Genes encoding CoA-binding proteins include CHAT, ACLY, NME1, TMEM120A, and many metabolic enzymes such as ACACA and FASN.
What is the GO term for coenzyme A binding?
The Gene Ontology term for coenzyme A binding is GO:0120225, under the molecular_function ontology.
How does coenzyme A bind to proteins?
CoA binds through a combination of hydrogen bonds, electrostatic interactions, and hydrophobic contacts, often within a nucleotide-binding pocket or Rossmann fold.
Why is coenzyme A binding important in cancer?
CoA-binding proteins like NME1 and ACLY are implicated in cancer metastasis and metabolism, making them potential therapeutic targets.
Can CRISPR be used to study coenzyme A binding?
Yes, CRISPR knockout, point mutation, and knock-in models allow researchers to dissect the functional roles of CoA-binding proteins in cells and animal models.
What diseases are associated with coenzyme A binding?
Diseases include cancer, neurodegeneration (e.g., PKAN), infectious diseases (e.g., tuberculosis), and metabolic disorders.
How is coenzyme A binding regulated?
Regulation occurs via CoA availability, post-translational modifications, magnesium ions, and protein multimerization.
What methods are used to study coenzyme A binding?
Common methods include X-ray crystallography, ITC, enzymatic assays, CRISPR editing, RNA-seq, and metabolomics.
What services does EDITGENE offer for coenzyme A binding research?
EDITGENE provides CRISPR knockout, point mutation, knock-in, overexpression cell models, library screening, and bioinformatics services to study CoA-binding proteins.
Conclusion
Coenzyme A binding (GO:0120225) is a fundamental molecular function that enables proteins to utilize CoA in diverse metabolic and regulatory processes. From neurotransmitter synthesis to cancer metabolism, CoA-binding proteins are central to cellular physiology and disease. Advances in structural biology and CRISPR genome editing continue to illuminate the mechanisms and functions of these proteins, offering new opportunities for therapeutic intervention. EDITGENE's comprehensive CRISPR services empower researchers to explore the causal roles of CoA-binding genes with precision and efficiency.
References
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- 4. McLelland GL et al.. 2023. Identification of an alternative triglyceride biosynthesis pathway.. Nature 621(7977):171-178 PMID: 37648867
- 5. Rong Y et al.. 2021. TMEM120A contains a specific coenzyme A-binding site and might not mediate poking- or stretch-induced channel activities in cells.. Elife 10 PMID: 34409941
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- 7. Bazilevsky GA et al.. 2019. ATP-citrate lyase multimerization is required for coenzyme-A substrate binding and catalysis.. J Biol Chem 294(18):7259-7268 PMID: 30877197
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