GO:0004329 formate-tetrahydrofolate ligase activity: Mechanism, Genes and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0004329 formate-tetrahydrofolate ligase activity catalyzes the ATP-dependent ligation of formate and tetrahydrofolate to produce 10-formyltetrahydrofolate, ADP, and phosphate.
• The enzyme is also known as 10-formyltetrahydrofolate synthetase (FTHFS) and is encoded by genes such as fhs in bacteria and MTHFD1 in eukaryotes.
• It is essential for one-carbon metabolism, supplying 10-formyl-THF for purine biosynthesis and formylmethionyl-tRNA formation.
• In methylotrophic bacteria, formate-tetrahydrofolate ligase is required for growth on methanol and other C1 compounds.
• The enzyme is a target of natural compounds such as berberine in intestinal bacteria, linking it to microbiome-host interactions.
• Dysregulation of folate cycle enzymes, including formyltetrahydrofolate synthetases, is associated with human diseases such as cancer and neural tube defects.
Description
Formate-tetrahydrofolate ligase activity (GO:0004329) is a fundamental enzymatic activity in one-carbon metabolism that catalyzes the reversible ATP-dependent conversion of formate and tetrahydrofolate (THF) to 10-formyltetrahydrofolate (10-formyl-THF), ADP, and phosphate. This reaction is a key entry point for formate into the folate pool and provides one-carbon units for biosynthetic pathways. The enzyme is widely distributed across bacteria, archaea, and eukaryotes, where it is known as formyltetrahydrofolate synthetase (FTHFS) or 10-formyl-THF synthetase. In eukaryotes, the activity resides in the trifunctional C1-tetrahydrofolate synthase (MTHFD1) and in mitochondrial monofunctional enzymes. Researchers study GO:0004329 because it links formate metabolism to purine synthesis, amino acid metabolism, and methylation reactions, and because its dysfunction is implicated in cancer, developmental disorders, and microbial pathogenesis. Understanding its mechanism, regulation, and structural features is essential for drug discovery and metabolic engineering.
formate-tetrahydrofolate ligase activity At A Glance
| GO ID | GO:0004329 |
|---|---|
| GO term | formate-tetrahydrofolate ligase activity |
| Ontology | molecular_function |
| Synonym | 10-formyltetrahydrofolate synthetase activity; 10-formyl-THF synthetase activity; formate:tetrahydrofolate ligase (ADP-forming); formyltetrahydrofolate synthetase activity; tetrahydrofolate formylase activity; tetrahydrofolic formylase activity |
| Major function | Catalyzes ATP-dependent ligation of formate and tetrahydrofolate to form 10-formyltetrahydrofolate, ADP, and phosphate |
| Reaction | ATP + formate + tetrahydrofolate = ADP + phosphate + 10-formyltetrahydrofolate |
| Cofactors | Magnesium ions (Mg2+), monovalent cations (e.g., K+, NH4+) |
| Pathway | One-carbon metabolism, folate cycle, purine biosynthesis |
| EC number | 6.3.4.3 |
What Is GO:0004329?
Formate-tetrahydrofolate ligase activity is defined as the catalysis of the reaction: ATP + formate + tetrahydrofolate = ADP + phosphate + 10-formyltetrahydrofolate. This activity enables the activation of formate by ATP to form a formyl-phosphate intermediate, which is then transferred to tetrahydrofolate, yielding 10-formyl-THF. It is a ligase (EC 6.3.4.3) that requires magnesium ions and monovalent cations for optimal activity.
Why Is formate-tetrahydrofolate ligase activity Important in Cell Biology?
Formate-tetrahydrofolate ligase activity is a central node in one-carbon metabolism, controlling the flux of formate into the folate pool and thereby influencing nucleotide biosynthesis, amino acid homeostasis, and methylation capacity. In bacteria, it is essential for methylotrophic growth and is a potential antibiotic target. In humans, the enzyme is part of the trifunctional MTHFD1 protein and mitochondrial C1-THF synthases, and its dysfunction has been linked to folate-related pathologies including cancer, neural tube defects, and mitochondrial disorders.
• Provides 10-formyl-THF for de novo purine biosynthesis, essential for DNA and RNA synthesis.
• Supplies formyl groups for the initiation of protein synthesis in bacteria and mitochondria.
• Required for methylotrophic growth in bacteria such as Methylobacterium extorquens.
• Target of berberine in intestinal bacteria, affecting host-microbiome interactions.
• Involved in folate cycle disorders and has been detected in pediatric brain tumors.
• Plays a role in acetate production in biohybrid systems, relevant for metabolic engineering.
• Dysregulation contributes to cancer cell proliferation through altered one-carbon flux.
• Potential target for antimicrobial and anticancer drug development.
• Enables formate utilization as a carbon source in engineered microbes.
• Its activity is critical for mitochondrial one-carbon metabolism and redox balance.
Molecular Mechanism of formate-tetrahydrofolate ligase activity
Substrate Binding and Activation
In simple terms: The enzyme grabs formate and ATP, then activates formate to a high-energy intermediate.
Formate-tetrahydrofolate ligase binds formate and ATP in the presence of Mg2+ and monovalent cations. The enzyme catalyzes the phosphorylation of formate by ATP to form formyl-phosphate, a reactive intermediate, with the release of ADP. This step is analogous to other ATP-dependent ligases and requires a conserved ATP-binding motif.
Formyl Transfer to Tetrahydrofolate
In simple terms: The activated formyl group is transferred onto tetrahydrofolate to make 10-formyl-THF.
The formyl-phosphate intermediate then reacts with tetrahydrofolate (THF) to form 10-formyltetrahydrofolate (10-formyl-THF) and inorganic phosphate. This transfer completes the ligation reaction and commits the one-carbon unit to the folate pool. The reaction is reversible, allowing the enzyme to also catalyze the reverse reaction under certain conditions.
Structural Features and Catalytic Residues
In simple terms: The enzyme has a specific 3D shape with key amino acids that hold substrates and speed up the reaction.
Crystal structures of formate-tetrahydrofolate ligase from Methylobacterium extorquens CM4 revealed a homodimeric arrangement with each monomer containing an N-terminal ATP-binding domain and a C-terminal tetrahydrofolate-binding domain. Conserved residues such as those in the P-loop and the catalytic cleft are essential for ATP hydrolysis and formyl transfer. The enzyme undergoes conformational changes upon substrate binding, as shown by biochemical and structural studies.
Cofactors and Metal Ion Requirements
In simple terms: The enzyme needs magnesium and potassium ions to work properly.
Formate-tetrahydrofolate ligase activity strictly requires divalent metal ions, with Mg2+ being the most effective, and is stimulated by monovalent cations such as K+ or NH4+. These ions help coordinate ATP and stabilize the transition state during catalysis. The enzyme from M. extorquens AM1 was purified and shown to require these cofactors for optimal activity.
Regulation and Post-translational Control
In simple terms: The enzyme's activity can be turned up or down by cellular signals and modifications.
In eukaryotes, the trifunctional MTHFD1 enzyme is regulated by its domains and possibly by phosphorylation, though direct evidence for formate-tetrahydrofolate ligase regulation is limited. In bacteria, expression of fhs is induced by formate and controlled by the FhlA transcriptional activator in some species. The non-enzymatic role of Nudix hydrolase 5 in repressing purine de novo synthesis may indirectly affect flux through this enzyme by altering 10-formyl-THF levels.
Key Genes Involved in GO:0004329 formate-tetrahydrofolate ligase activity
The following genes encode proteins that exhibit formate-tetrahydrofolate ligase activity or are directly involved in its function and regulation.
| Gene | Major Role | Research Relevance |
|---|---|---|
| fhs (Methylobacterium extorquens) | Encodes formate-tetrahydrofolate ligase; essential for methylotrophic growth | Model for bacterial C1 metabolism and enzyme structure |
| MTHFD1 (human) | Trifunctional enzyme with formyltetrahydrofolate synthetase activity | Linked to folate-related diseases and cancer |
| MTHFD1L (human) | Mitochondrial monofunctional formyltetrahydrofolate synthetase | Mitochondrial one-carbon metabolism and disease |
| MTHFD2 (human) | Mitochondrial bifunctional enzyme with formyltetrahydrofolate synthetase activity | Cancer metabolism and proliferation |
| fhs (Clostridium) | Formate-tetrahydrofolate ligase in acetogenic bacteria | Biofuel and acetate production |
| fhs (Sporomusa ovata) | Involved in acetate synthesis in biohybrid systems | Photosynthetic biohybrid applications |
| FtfL (intestinal bacteria) | Formate-tetrahydrofolate ligase targeted by berberine | Microbiome-host interactions and drug discovery |
| MTHFD1 (mouse) | Murine homolog of trifunctional C1-THF synthase | Developmental and folate studies |
| MTHFD2 (mouse) | Mitochondrial enzyme with formyltetrahydrofolate synthetase activity | Embryonic development and cancer models |
| fhs (Escherichia coli) | Formate-tetrahydrofolate ligase in enterobacteria | Antibiotic target and metabolic engineering |
| MTHFD1L (mouse) | Mitochondrial formyltetrahydrofolate synthetase | Mitochondrial disease models |
| fhs (Methylobacterium extorquens CM4) | Structurally characterized formate-tetrahydrofolate ligase | Enzyme mechanism and inhibitor design |
| MTHFD2L (human) | Mitochondrial enzyme with formyltetrahydrofolate synthetase activity | One-carbon metabolism in cancer |
| fhs (Clostridium thermoaceticum) | Formate-tetrahydrofolate ligase in acetogens | Wood-Ljungdahl pathway |
| MTHFD1 (zebrafish) | Vertebrate model for folate cycle | Developmental genetics |
| fhs (Mycobacterium tuberculosis) | Putative formate-tetrahydrofolate ligase | Antitubercular drug target |
How Is formate-tetrahydrofolate ligase activity Regulated?
Formate-tetrahydrofolate ligase activity is regulated at multiple levels. In bacteria, the fhs gene is often part of the formate regulon and is induced by formate under anaerobic conditions. In eukaryotes, the trifunctional MTHFD1 enzyme is regulated by its domain organization and potentially by post-translational modifications, though direct evidence is limited. The non-enzymatic role of Nudix hydrolase 5 in repressing purine de novo synthesis may indirectly affect flux through this enzyme by altering 10-formyl-THF levels. Additionally, the enzyme's activity can be modulated by the availability of substrates (formate, THF, ATP) and cofactors (Mg2+, K+).
formate-tetrahydrofolate ligase activity and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| MTHFD1 | Neural tube defects, folate deficiency | Knockout mouse, human cell lines |
| MTHFD2 | Cancer proliferation | Cancer cell lines, xenograft models |
| FtfL (bacterial) | Microbiome-related metabolic disorders | Gnotobiotic mice, bacterial cultures |
| MTHFD1L | Mitochondrial dysfunction | Patient-derived fibroblasts, KO models |
| fhs (M. extorquens) | Methylotrophic growth defects | Bacterial genetics |
Folate Cycle Disorders and Neural Tube Defects
Mutations in MTHFD1, which harbors formate-tetrahydrofolate ligase activity, have been associated with increased risk of neural tube defects and other folate-related congenital anomalies. The enzyme's role in supplying one-carbon units for nucleotide synthesis and methylation is critical during embryonic development.
Cancer Metabolism
Upregulation of mitochondrial formyltetrahydrofolate synthetases, such as MTHFD2, is observed in various cancers and supports purine synthesis for rapid proliferation. Targeting these enzymes is a potential anticancer strategy.
Pediatric Brain Tumors
Activities of folate cycle enzymes, including 5-formyltetrahydrofolate cyclodehydrase and 5,10-methenyltetrahydrofolate cyclohydrolase, were altered in primary brain tumors in children, suggesting a link between folate metabolism and tumorigenesis.
Microbiome and Metabolic Disorders
Berberine inhibits formate-tetrahydrofolate ligase (FtfL) in intestinal bacteria, altering microbial one-carbon metabolism and potentially contributing to its therapeutic effects on metabolic disorders.
From formate-tetrahydrofolate ligase activity-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Enzyme catalytic mechanism | Recombinant protein, crystal structure |
| Role in methylotrophic growth | fhs knockout in Methylobacterium extorquens |
| Effect on purine synthesis | MTHFD1 knockout cell lines |
| Drug target validation | Berberine treatment in bacterial cultures |
| Cancer cell proliferation | MTHFD2 overexpression/knockdown in cancer cells |
| Mitochondrial one-carbon flux | MTHFD1L knockout mice |
How to Study the formate-tetrahydrofolate ligase activity Process
| Method | What It Measures | Typical Application |
|---|---|---|
| Spectrophotometric assay | ADP formation or 10-formyl-THF production | Enzyme kinetics and inhibitor screening |
| Radioactive assay | Incorporation of [14C]formate into 10-formyl-THF | Enzyme activity in crude extracts |
| X-ray crystallography | Three-dimensional structure | Mechanistic studies and drug design |
| Knockout mutagenesis | Growth phenotype | Gene essentiality in bacteria |
| Metabolomics (LC-MS) | Intracellular metabolite levels | Flux analysis in disease models |
| 13C-flux analysis | Metabolic pathway activity | Cancer metabolism research |
| Western blot | Protein expression levels | Regulation studies |
| qRT-PCR | mRNA expression | Transcriptional regulation |
Enzymatic Assays
Formate-tetrahydrofolate ligase activity is typically measured spectrophotometrically by coupling the formation of ADP to NADH oxidation or by monitoring the formation of 10-formyl-THF at 350 nm. Radioactive assays using [14C]formate can also be used.
Structural Biology
X-ray crystallography and cryo-EM have been used to determine the structure of formate-tetrahydrofolate ligase from M. extorquens CM4, revealing substrate-binding sites and conformational changes.
Genetic Knockouts and Complementation
Knockout mutants of fhs in bacteria are generated to study growth phenotypes, and complementation with wild-type or mutant alleles confirms gene function.
Metabolomics and Flux Analysis
LC-MS-based metabolomics and 13C-flux analysis are used to measure 10-formyl-THF levels and one-carbon flux in cells with altered enzyme activity.
How CRISPR Can Be Used to Study GO:0004329 formate-tetrahydrofolate ligase activity
Knockout
CRISPR-Cas9 knockout of MTHFD1, MTHFD2, or MTHFD1L in human cell lines can abolish formate-tetrahydrofolate ligase activity, leading to reduced purine synthesis and growth defects. Bacterial fhs knockouts are used to study methylotrophic growth.
Point Mutation
Point mutations in catalytic residues of formate-tetrahydrofolate ligase (e.g., in the ATP-binding site) can be introduced to dissect mechanism and to model human polymorphisms associated with disease.
Knock-in
Knock-in of tagged versions (e.g., FLAG, GFP) of MTHFD1 or MTHFD2 allows for localization and interaction studies in cells.
Overexpression
Overexpression of MTHFD2 or MTHFD1L in cancer cell lines can increase one-carbon flux and promote proliferation, providing a model for studying oncogenic roles.
How EDITGENE Supports formate-tetrahydrofolate ligase activity Research
Researchers studying formate-tetrahydrofolate ligase activity-related genes often need to determine whether a candidate gene is causally involved in one-carbon metabolism, disease progression, or drug response. EDITGENE provides comprehensive CRISPR-based services to generate precisely engineered cell models, enabling functional validation and mechanistic studies.
Contact EDITGENE today to design your custom CRISPR model for formate-tetrahydrofolate ligase activity research.
Frequently Asked Questions About formate-tetrahydrofolate ligase activity
What is formate-tetrahydrofolate ligase activity?
It is an enzymatic activity (GO:0004329) that catalyzes the ATP-dependent conversion of formate and tetrahydrofolate to 10-formyltetrahydrofolate, ADP, and phosphate.
What genes are involved in formate-tetrahydrofolate ligase activity?
Genes include fhs in bacteria and MTHFD1, MTHFD1L, MTHFD2, and MTHFD2L in humans, which encode enzymes with this activity.
What is the role of formate-tetrahydrofolate ligase in one-carbon metabolism?
It provides 10-formyl-THF for purine synthesis and formylmethionyl-tRNA formation, linking formate to the folate cycle.
Which diseases are associated with formate-tetrahydrofolate ligase dysfunction?
Folate cycle disorders, neural tube defects, cancer, and mitochondrial diseases have been linked to altered activity.
How is formate-tetrahydrofolate ligase activity measured?
Common methods include spectrophotometric assays monitoring ADP formation or 10-formyl-THF production, and radioactive assays with [14C]formate.
What is the structure of formate-tetrahydrofolate ligase?
It is typically a homodimer with an N-terminal ATP-binding domain and a C-terminal tetrahydrofolate-binding domain, as shown for the M. extorquens enzyme.
Is formate-tetrahydrofolate ligase a drug target?
Yes, it is a target of berberine in intestinal bacteria and is considered a potential target for antimicrobial and anticancer drugs.
What cofactors are required for formate-tetrahydrofolate ligase activity?
Magnesium ions (Mg2+) and monovalent cations such as K+ or NH4+ are required for optimal activity.
How can CRISPR be used to study formate-tetrahydrofolate ligase?
CRISPR knockout, point mutation, knock-in, and overexpression models allow functional dissection of the enzyme in cells and organisms.
What are the synonyms for formate-tetrahydrofolate ligase activity?
Synonyms include 10-formyltetrahydrofolate synthetase activity, 10-formyl-THF synthetase activity, formyltetrahydrofolate synthetase activity, and tetrahydrofolate formylase activity.
Conclusion
Formate-tetrahydrofolate ligase activity (GO:0004329) is a cornerstone of one-carbon metabolism, bridging formate utilization with nucleotide biosynthesis and methylation. Its structural and mechanistic features have been elucidated in bacteria, and its human counterparts are implicated in cancer, developmental disorders, and mitochondrial dysfunction. Continued research using CRISPR-based models and advanced metabolomics will further illuminate its roles and therapeutic potential.
References
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- 2. Nguyen TA et al.. 2025. A non-enzymatic role of Nudix hydrolase 5 in repressing purine de novo synthesis.. Science 390(6778):1143-1150 PMID: 41196952
- 3. Marx CJ et al.. 2003. Purification of the formate-tetrahydrofolate ligase from Methylobacterium extorquens AM1 and demonstration of its requirement for methylotrophic growth.. J Bacteriol 185(24):7169-75 PMID: 14645277
- 4. Fowler B. 2001. The folate cycle and disease in humans.. Kidney Int Suppl 78:S221-9 PMID: 11169015
- 5. Yan J et al.. 2023. Identification of FtfL as a novel target of berberine in intestinal bacteria.. BMC Biol 21(1):280 PMID: 38049785
- 6. Tzortzatou-Stathopoulou F et al.. 1996. Activity of 5-formyl tetrahydrofolate cyclodehydrase and 5,10-methenyl tetrahydrofolate cyclohydrolase in primary brain tumors in children.. Pediatr Hematol Oncol 13(6):511-9 PMID: 8940734
- 7. He Y et al.. 2022. Photosynthesis of Acetate by Sporomusa ovata-CdS Biohybrid System.. ACS Appl Mater Interfaces 14(20):23364-23374 PMID: 35576621
- 8. Christensen KE et al.. 2008. Mitochondrial methylenetetrahydrofolate dehydrogenase, methenyltetrahydrofolate cyclohydrolase, and formyltetrahydrofolate synthetases.. Vitam Horm 79:393-410 PMID: 18804703
