GO:0015943 formate biosynthetic process: Metabolic Pathway, Genes, Functions and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0015943 formate biosynthetic process describes the chemical reactions and pathways that produce formate (HCOO-), the anion of formic acid.
• Formate is a central one-carbon metabolite generated by fermentation, formaldehyde oxidation, and molybdenum/tungsten-dependent formate dehydrogenases [1,3,4].
• In enterobacteria, formate biosynthesis is tightly linked to the formate-hydrogen axis, influencing fermentation balance and energy conservation.
• Formate can accelerate glycolytic flux in astrocytes, linking this pathway to brain metabolism and neuroenergetics.
• Inhibition of sulfate-reducing bacteria by formate highlights its ecological and antimicrobial relevance.
• CRISPR-based knockout, knock-in, and overexpression models enable causal dissection of formate biosynthetic genes in microbes and mammalian cells [2,6].
Description
Formate biosynthetic process (GO:0015943) is defined as the chemical reactions and pathways resulting in the formation of formate, also known as methanoate, the anion HCOO- derived from methanoic (formic) acid. This process is fundamental to one-carbon metabolism and is widely distributed across prokaryotes, archaea, and eukaryotes [1,4]. In Escherichia coli, formate is a major fermentation product generated during mixed-acid fermentation, where it serves as both an electron donor and a metabolic intermediate. The formate-hydrogen axis further connects formate biosynthesis to hydrogen production and pH homeostasis in enterobacterial fermentation. Beyond microbes, formate generated by cellular oxidation of formaldehyde can accelerate glycolytic flux in cultured astrocytes, indicating a role in mammalian energy metabolism. Understanding formate biosynthetic process is therefore critical for microbiology, metabolic engineering, and human health research.
formate biosynthetic process At A Glance
| GO ID | GO:0015943 |
|---|---|
| GO term | formate biosynthetic process |
| Ontology | biological_process |
| Synonym | formate anabolism; formate biosynthesis; formate formation; formate synthesis; formic acid biosynthesis; formic acid biosynthetic process |
| Major function | Production of formate (HCOO-) via fermentation, formaldehyde oxidation, or CO2 reduction |
| Key enzymes | Formate dehydrogenase (FDH), pyruvate formate-lyase (PFL), formaldehyde dehydrogenase |
| Cellular context | Cytoplasm, mitochondria, and microbial fermentation pathways |
| Related pathways | One-carbon metabolism, mixed-acid fermentation, formate-hydrogen axis |
What Is GO:0015943?
GO:0015943 formate biosynthetic process encompasses the enzymatic and non-enzymatic reactions that lead to the production of formate (HCOO-). This includes pathways such as the oxidation of formaldehyde to formate, the reduction of carbon dioxide to formate by formate dehydrogenases, and fermentative routes in bacteria that generate formate from pyruvate or other substrates [1,3,4]. The term is a biological process ontology annotation used to describe gene products that participate in formate formation, excluding those solely involved in formate oxidation or utilization [1,6].
Why Is formate biosynthetic process Important in Cell Biology?
Formate biosynthetic process is essential for cellular one-carbon metabolism, energy balance, and redox homeostasis. In bacteria, formate production is a key branch of fermentation that influences ATP yield and the ratio of fermentation end products. The formate-hydrogen axis impacts enterobacterial physiology by modulating hydrogen production and intracellular pH. In mammals, formate generated from formaldehyde oxidation can stimulate glycolysis in astrocytes, linking this pathway to brain energy metabolism. Moreover, formate is a substrate for sulfate-reducing bacteria and its inhibition can shape microbial community dynamics. Understanding formate biosynthesis also has biotechnological implications for sustainable carbon utilization, where formate dehydrogenases are engineered for CO2 reduction.
• Central to one-carbon metabolism and fermentation in Escherichia coli and other enterobacteria.
• Links to the formate-hydrogen axis, affecting hydrogen production and pH homeostasis.
• Formate from formaldehyde oxidation accelerates glycolytic flux in astrocytes.
• Molybdenum and tungsten-dependent formate dehydrogenases are key enzymes in formate biosynthesis and oxidation.
• Formate inhibits sulfate-reducing bacteria, with ecological and industrial implications.
• Formate is a target for metabolic reprogramming to enhance antibiotic susceptibility in resistant bacteria.
• Formate dehydrogenases are central to sustainable CO2 reduction and carbon utilization.
• Human absorption and elimination of formate from calcium formate has been characterized, relevant to nutrition and toxicology.
What Happens During formate biosynthetic process?
Fermentative formate production in enterobacteria
In simple terms: Bacteria make formate as a waste product when they ferment sugars without oxygen.
In Escherichia coli and related enterobacteria, formate is a major product of mixed-acid fermentation. Pyruvate formate-lyase (PFL) converts pyruvate and coenzyme A into acetyl-CoA and formate, a central reaction that channels carbon toward formate biosynthesis. This pathway is active under anaerobic conditions and is part of the formate-hydrogen axis, where formate can be further cleaved to H2 and CO2 by the formate hydrogenlyase complex. The balance between formate production and consumption influences fermentation end-product profiles and energy conservation.
Formaldehyde oxidation to formate
In simple terms: Cells can turn formaldehyde, a toxic molecule, into formate.
Formate can be generated by the oxidation of formaldehyde, a reaction catalyzed by formaldehyde dehydrogenase. In cultured astrocytes, formate generated from formaldehyde oxidation accelerates glycolytic flux, demonstrating a metabolic link between formaldehyde detoxification and energy metabolism. This route represents a non-fermentative source of formate that contributes to the cellular formate pool and one-carbon metabolism.
CO2 reduction by formate dehydrogenases
In simple terms: Some enzymes can convert carbon dioxide directly into formate.
Molybdenum and tungsten-dependent formate dehydrogenases (FDHs) catalyze the reversible reduction of CO2 to formate, a key step in carbon fixation and sustainable carbon utilization [4,6]. These enzymes are found in diverse bacteria and archaea and are central to the formate biosynthetic process when operating in the reductive direction. Their catalytic mechanism involves a metal center that facilitates hydride transfer to CO2. Engineering FDHs for CO2 reduction is an active area of biotechnology.
Formate-hydrogen axis and physiological impact
In simple terms: Formate can be converted to hydrogen gas, affecting how bacteria manage energy and pH.
The formate-hydrogen axis refers to the interconnected pathways of formate production and its subsequent cleavage to H2 and CO2. This axis impacts enterobacterial fermentation physiology by influencing redox balance, ATP synthesis, and intracellular pH. The activity of the formate hydrogenlyase complex, which consumes formate, is tightly regulated in response to environmental conditions. Disruption of this axis alters fermentation product yields and growth characteristics.
Ecological and antimicrobial roles of formate
In simple terms: Formate can affect the growth of other bacteria, including sulfate reducers.
Formate is not only a metabolic intermediate but also an environmental signal. It has been shown to inhibit sulfate-reducing bacteria, which are important in anaerobic corrosion and sulfur cycling. This inhibition may be due to formate's impact on their energy metabolism. Additionally, metabolic reprogramming that alters formate levels can enhance the susceptibility of multidrug-resistant bacteria to antibiotics, highlighting formate biosynthesis as a potential therapeutic target.
Key Genes Involved in GO:0015943 formate biosynthetic process
The following genes and proteins are experimentally implicated in formate biosynthetic process or its regulation across microbial and mammalian systems.
| Gene | Major Role | Research Relevance |
|---|---|---|
| pflB | Pyruvate formate-lyase, converts pyruvate to formate and acetyl-CoA | Key enzyme for fermentative formate production in E. coli |
| fdhF | Formate dehydrogenase H, part of formate hydrogenlyase complex | Involved in formate oxidation and hydrogen production |
| fdh1 | NAD-dependent formate dehydrogenase, catalyzes CO2 reduction to formate | Biotechnological target for carbon capture |
| fdhAB | Formate dehydrogenase O, membrane-bound, oxidizes formate | Links formate metabolism to respiratory chains |
| fdoG | Formate dehydrogenase O large subunit | Molybdenum-containing enzyme for formate oxidation |
| fdwA | Tungsten-containing formate dehydrogenase | Studied for tungsten-dependent formate metabolism |
| adhE | Alcohol dehydrogenase, consumes acetyl-CoA from PFL | Affects flux through formate-producing pathway |
| ackA | Acetate kinase, converts acetyl-phosphate to acetate | Competes with formate production for pyruvate |
| pta | Phosphotransacetylase, converts acetyl-CoA to acetyl-phosphate | Influences fermentation balance |
| hycE | Hydrogenase 3 large subunit, part of formate hydrogenlyase | Directly consumes formate to produce H2 |
| hycB | Hydrogenase 3 small subunit | Essential for formate hydrogenlyase activity |
| fhlA | Transcriptional activator of formate hydrogenlyase genes | Regulates formate-hydrogen axis |
| fdh | Formaldehyde dehydrogenase, oxidizes formaldehyde to formate | Generates formate in astrocytes |
| gcvH | Glycine cleavage system H protein, produces formate from glycine | Alternative formate source in one-carbon metabolism |
| purU | Formyltetrahydrofolate deformylase, produces formate from 10-formyl-THF | Links formate biosynthesis to purine metabolism |
| ftfL | Formyltetrahydrofolate synthetase, interconverts formate and 10-formyl-THF | Regulates formate pool |
| moeA | Molybdopterin biosynthesis protein | Required for active formate dehydrogenases |
| fdhD | Formate dehydrogenase accessory protein | Chaperone for FDH maturation |
How Is formate biosynthetic process Regulated?
Formate biosynthetic process is regulated at multiple levels. In enterobacteria, the formate-hydrogen axis is controlled by the transcriptional activator FhlA, which responds to formate levels and anaerobic conditions. Pyruvate formate-lyase (PFL) is post-translationally regulated by reversible activation via PFL-activating enzyme, which introduces a glycyl radical essential for catalysis. Additionally, the availability of molybdenum and tungsten cofactors regulates the activity of formate dehydrogenases. In mammalian cells, formaldehyde oxidation to formate can be influenced by alcohol dehydrogenase and aldehyde dehydrogenase activities. Metabolic reprogramming in antibiotic-resistant bacteria can alter formate levels, suggesting that formate biosynthesis is subject to adaptive regulation.
formate biosynthetic process and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| pflB | Bacterial fermentation and antibiotic resistance | E. coli knockout and antibiotic susceptibility assays |
| fdh | Formaldehyde detoxification and neurotoxicity | Astrocyte cell culture with fdh knockdown |
| fdhF | Enterobacterial fermentation and pH homeostasis | E. coli fdhF deletion and fermentation profiling |
| fdh1 | CO2 reduction and carbon utilization | Engineered bacterial strains for formate production |
| dsrAB | Sulfate reduction inhibition | Desulfovibrio cultures with formate treatment |
Antibiotic resistance and bacterial infections
Metabolic reprogramming that enhances formate production or utilization can increase the susceptibility of multidrug- and carbapenem-resistant bacteria to antibiotics, indicating that formate biosynthetic pathways are potential targets for adjuvant therapy. Inhibiting formate biosynthesis may disrupt bacterial energy metabolism and restore antibiotic efficacy.
Neurological and metabolic disorders
Formate generated by formaldehyde oxidation in astrocytes accelerates glycolytic flux, linking formate biosynthesis to brain energy metabolism. Dysregulation of this pathway may contribute to neurotoxicity or metabolic imbalances, although direct disease associations require further study.
Microbial ecology and industrial biofouling
Formate inhibits sulfate-reducing bacteria, which are implicated in anaerobic corrosion and hydrogen sulfide production. Modulating formate levels could be a strategy to control microbial communities in industrial settings, though this is not a human disease per se.
From formate biosynthetic process-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does pflB knockout abolish fermentative formate production? | E. coli pflB knockout (KO) |
| Can a point mutation in fdh1 alter CO2 reduction efficiency? | Site-directed point mutation in fdh1 |
| Does knock-in of fdhF restore formate hydrogenlyase activity? | E. coli fdhF knock-in |
| Can overexpression of formaldehyde dehydrogenase increase formate levels? | Astrocyte overexpression model |
| Does CRISPR knockout of fdh affect antibiotic susceptibility? | Multidrug-resistant bacterial KO library |
| Can tagged knock-in of fdhF reveal protein localization? | E. coli fdhF-FLAG knock-in |
How to Study the formate biosynthetic process Process
| Method | What It Measures | Typical Application |
|---|---|---|
| CRISPR knockout | Gene essentiality for formate production | E. coli pflB KO |
| HPLC/GC-MS | Formate and fermentation product levels | Quantifying formate in culture supernatants |
| Enzyme activity assay | Formate dehydrogenase or PFL activity | Characterizing FDH variants |
| 13C isotope tracing | Carbon flux to formate | Metabolic pathway analysis |
| RNA-seq | Transcriptional changes in formate genes | Response to antibiotics |
| Reporter gene assay | Promoter activity of formate genes | Regulation by FhlA |
| Western blot | Protein expression of FDH or PFL | Validating knockout or overexpression |
| Antibiotic susceptibility test | MIC changes upon formate pathway modulation | Resistance reversal studies |
Genetic knockout and metabolic profiling
CRISPR-Cas9 knockout of candidate genes such as pflB or fdhF followed by fermentation product analysis (e.g., HPLC or GC-MS) can determine their essentiality for formate biosynthesis [1,7]. This approach is scalable for high-throughput screening of gene libraries.
Enzyme activity assays
Formate dehydrogenase activity can be measured spectrophotometrically by monitoring NADH or NADPH production, or by using artificial electron acceptors [4,6]. Pyruvate formate-lyase activity is typically assayed by coupling formate production to formate dehydrogenase.
Isotope tracing and metabolomics
13C-labeled substrates (e.g., 13C-formate, 13C-bicarbonate) can trace carbon flux through formate biosynthetic pathways using NMR or mass spectrometry [3,6]. This reveals contributions of different routes to the cellular formate pool.
Transcriptional and translational reporters
Luciferase or fluorescent reporters fused to formate biosynthetic gene promoters (e.g., pflB, fdhF) enable real-time monitoring of pathway activity under different conditions. RNA-seq can quantify global changes in gene expression.
How CRISPR Can Be Used to Study GO:0015943 formate biosynthetic process
Knockout
CRISPR-Cas9 knockout of genes such as pflB, fdhF, or fdh1 can abolish or reduce formate biosynthesis, enabling causal tests of their role in fermentation, energy metabolism, and antibiotic susceptibility [1,2,7]. Knockout libraries can screen for genes required for formate production under specific conditions.
Point Mutation
Introducing specific point mutations into formate dehydrogenase genes (e.g., fdh1) can alter catalytic efficiency or cofactor specificity, allowing structure-function studies and engineering of enzymes for CO2 reduction [4,6]. Point mutations in regulatory elements can also dissect promoter control.
Knock-in
Knock-in of tagged versions of formate biosynthetic genes (e.g., fdhF-FLAG) enables protein localization, interaction, and stability studies. Knock-in of heterologous formate dehydrogenases can create synthetic formate production pathways in model organisms.
Overexpression
Overexpression of formate biosynthetic genes, such as formaldehyde dehydrogenase or pyruvate formate-lyase, can increase formate flux and is used to study metabolic burden, pathway bottlenecks, and biotechnological formate production [3,6]. Inducible overexpression allows temporal control.
How EDITGENE Supports formate biosynthetic process Research
Researchers studying formate biosynthetic process-related genes often need to determine whether a candidate gene is causally involved in formate production, how mutations affect enzyme activity, and whether overexpression can enhance pathway flux. EDITGENE provides comprehensive CRISPR-based services to address these questions with precision and scale.
Contact EDITGENE today to design your custom CRISPR model for formate biosynthetic process research.
Frequently Asked Questions About formate biosynthetic process
What is formate biosynthetic process?
Formate biosynthetic process (GO:0015943) is the set of chemical reactions and pathways that produce formate (HCOO-), the anion of formic acid, through fermentation, formaldehyde oxidation, or CO2 reduction [1,3,4].
What genes are involved in formate biosynthetic process?
Key genes include pflB (pyruvate formate-lyase), fdhF (formate dehydrogenase H), fdh1 (NAD-dependent formate dehydrogenase), and formaldehyde dehydrogenase, among others [1,4,6].
How is formate produced in E. coli?
In E. coli, formate is mainly produced by pyruvate formate-lyase (PFL) during mixed-acid fermentation and can be further metabolized by the formate-hydrogen axis [1,7].
What is the formate-hydrogen axis?
The formate-hydrogen axis refers to the interconnected pathways of formate production and its cleavage to hydrogen and CO2 by the formate hydrogenlyase complex, impacting fermentation physiology.
Can formate be produced from CO2?
Yes, molybdenum and tungsten-dependent formate dehydrogenases can catalyze the reversible reduction of CO2 to formate, a key reaction for carbon utilization [4,6].
Why is formate important in astrocytes?
Formate generated by formaldehyde oxidation in astrocytes accelerates glycolytic flux, linking formate biosynthesis to brain energy metabolism.
Does formate affect antibiotic resistance?
Metabolic reprogramming that alters formate levels can enhance the susceptibility of multidrug-resistant bacteria to antibiotics, suggesting formate pathways as therapeutic targets.
How can I study formate biosynthetic process using CRISPR?
CRISPR knockout, knock-in, point mutation, and overexpression models allow functional dissection of formate biosynthetic genes in bacteria and mammalian cells [2,6].
What methods measure formate production?
HPLC, GC-MS, enzyme activity assays, and 13C isotope tracing are commonly used to quantify formate and assess pathway flux [1,3,4].
Is formate toxic to humans?
Formate absorption and elimination have been studied in humans; at high doses it can be toxic, but it is also a normal metabolite.
Conclusion
Formate biosynthetic process (GO:0015943) is a fundamental metabolic pathway with broad relevance from microbial fermentation to mammalian one-carbon metabolism. Its roles in the formate-hydrogen axis, formaldehyde detoxification, and CO2 reduction make it a key target for understanding energy balance, antibiotic resistance, and sustainable biotechnology [1,3,4,6,7]. CRISPR-based functional genomics provides powerful tools to dissect the genes and regulatory mechanisms underlying this pathway, offering new insights into basic biology and potential therapeutic interventions.
References
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- 2. Kuang SF et al.. 2025. Metabolic reprogramming enhances the susceptibility of multidrug- and carbapenem-resistant bacteria to antibiotics.. Nat Microbiol 10(9):2257-2274 PMID: 40790107
- 3. Tulpule K et al.. 2012. Formate generated by cellular oxidation of formaldehyde accelerates the glycolytic flux in cultured astrocytes.. Glia 60(4):582-93 PMID: 22258934
- 4. Maia LB et al.. 2015. Molybdenum and tungsten-dependent formate dehydrogenases.. J Biol Inorg Chem 20(2):287-309 PMID: 25476858
- 5. Hanzlik RP et al.. 2005. Absorption and elimination of formate following oral administration of calcium formate in female human subjects.. Drug Metab Dispos 33(2):282-6 PMID: 15547050
- 6. Zheng Y et al.. 2025. From formate oxidation to CO₂ reduction: The role of formate dehydrogenase in sustainable carbon utilization.. Biotechnol Adv 82:108600 PMID: 40368117
- 7. Kammel M et al.. 2024. The formate-hydrogen axis and its impact on the physiology of enterobacterial fermentation.. Adv Microb Physiol 84:51-82 PMID: 38821634
- 8. Voskuhl L et al.. 2022. Inhibition of sulfate-reducing bacteria with formate.. FEMS Microbiol Ecol 98(1) PMID: 35040992
