GO:0006106 fumarate metabolic process: Key Pathway, Genes, Functions and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0006106 fumarate metabolic process describes the chemical reactions and pathways involving fumarate, a key TCA cycle intermediate formed from succinate and converted to malate.
• Fumarate is produced by succinate dehydrogenase (SDH) and hydrated to malate by fumarate hydratase (FH); loss of FH causes fumarate accumulation linked to hereditary leiomyomatosis and renal cell cancer.
• Fumarate acts as an oncometabolite by inhibiting alpha-ketoglutarate-dependent dioxygenases, including histone and DNA demethylases, altering epigenetic landscapes.
• Fumarate accumulation drives cysteine succination of proteins, a post-translational modification with broad functional implications.
• In macrophages, fumarate hydratase restrains mtRNA-mediated interferon production, linking fumarate metabolism to innate immunity.
• Fumarate is also a target for metabolic imaging using hyperpolarized [1-13C]fumarate, enabling non-invasive assessment of cell death and tumor response.
Description
Fumarate metabolic process (GO:0006106) encompasses the chemical reactions and pathways involving fumarate, the anion of trans-1,2-ethenedicarboxylic acid and the diastereoisomer of maleate. As a central intermediate in the tricarboxylic acid (TCA) cycle, fumarate is generated from succinate and subsequently converted into malate, playing a pivotal role in mitochondrial energy metabolism and biosynthetic pathways. Beyond its canonical role, fumarate has emerged as a signaling molecule and oncometabolite, with profound implications for cancer, immunity, and metabolic regulation. Recent research has highlighted the importance of fumarate in diverse physiological and pathological contexts. For instance, fumarate accumulation due to fumarate hydratase (FH) deficiency inhibits alpha-ketoglutarate-dependent dioxygenases, leading to epigenetic reprogramming and tumorigenesis. In macrophages, FH restrains mtRNA-mediated interferon production, underscoring its role in innate immune responses. Furthermore, fumarate-induced cysteine succination modifies protein function and contributes to cellular stress responses. These findings position fumarate metabolism as a critical node in cellular homeostasis and disease. Understanding fumarate metabolic process is essential for researchers investigating mitochondrial dysfunction, cancer metabolism, and immune regulation. The pathway's intersection with redox balance, epigenetic regulation, and cell death pathways makes it a compelling target for therapeutic intervention and biomarker development [3,4,7].
fumarate metabolic process At A Glance
| GO ID | GO:0006106 |
|---|---|
| GO term | fumarate metabolic process |
| Ontology | biological_process |
| Synonym | fumarate metabolism |
| Definition | The chemical reactions and pathways involving fumarate, the anion of trans-1,2-ethenedicarboxylic acid, the diastereoisomer of maleate. It is a key intermediate in metabolism and is formed in the TCA cycle from succinate and converted into malate. |
| Major function | Central TCA cycle intermediate; precursor for malate, aspartate, and arginine biosynthesis; signaling molecule and oncometabolite. |
| Key enzymes | Succinate dehydrogenase (SDH), fumarate hydratase (FH), fumarase. |
| Related pathways | TCA cycle, oxidative phosphorylation, amino acid metabolism, epigenetic regulation. |
| Disease relevance | Hereditary leiomyomatosis and renal cell cancer (HLRCC), ischemia-reperfusion injury, immune dysregulation. |
What Is GO:0006106?
According to the Gene Ontology, fumarate metabolic process (GO:0006106) is defined as the chemical reactions and pathways involving fumarate, the anion of trans-1,2-ethenedicarboxylic acid, the diastereoisomer of maleate. It is a key intermediate in metabolism and is formed in the TCA cycle from succinate and converted into malate. This process includes enzymatic steps such as the oxidation of succinate to fumarate by succinate dehydrogenase and the hydration of fumarate to malate by fumarate hydratase, as well as transport and regulatory mechanisms that maintain fumarate homeostasis.
Why Is fumarate metabolic process Important in Cell Biology?
Fumarate metabolic process is fundamental to cellular energy production and biosynthesis, as fumarate serves as a critical node in the TCA cycle and a precursor for multiple metabolites. Dysregulation of this pathway leads to fumarate accumulation, which acts as an oncometabolite by inhibiting alpha-ketoglutarate-dependent dioxygenases, thereby altering epigenetic marks and contributing to cancer development. Moreover, fumarate accumulation during ischemia-reperfusion injury drives mitochondrial ROS production, highlighting its role in oxidative stress. In immunity, fumarate hydratase in macrophages restrains mtRNA-mediated interferon production, linking fumarate metabolism to antiviral responses. Thus, understanding fumarate metabolic process is essential for deciphering mechanisms of cancer, metabolic disorders, and immune regulation.
• Fumarate is a key TCA cycle intermediate, essential for mitochondrial ATP production and biosynthesis.
• Fumarate accumulation inhibits alpha-KG-dependent dioxygenases, leading to epigenetic reprogramming in cancer.
• FH mutations cause hereditary leiomyomatosis and renal cell cancer (HLRCC) due to fumarate buildup.
• Fumarate induces cysteine succination, a post-translational modification affecting protein function.
• In macrophages, fumarate hydratase regulates mtRNA-mediated interferon production, impacting innate immunity.
• Ischemic accumulation of succinate and fumarate drives reperfusion injury through mitochondrial ROS.
• Fumarate is a target for hyperpolarized 13C metabolic imaging to assess tumor response.
• Fumarate metabolism is linked to mitophagy regulation, with fumarate acting as a brake on mitophagy.
• Bioorthogonal ligation of fumarate enables chemical biology studies of oncometabolite signaling.
• Fumarate metabolic process intersects with redox balance, cell death, and metabolic signaling pathways [3,7].
What Happens During fumarate metabolic process?
Succinate oxidation to fumarate
In simple terms: Succinate is converted into fumarate by removing hydrogen atoms.
In the TCA cycle, succinate dehydrogenase (SDH) catalyzes the oxidation of succinate to fumarate, transferring electrons to the ubiquinone pool. This reaction is part of both the TCA cycle and the electron transport chain, linking fumarate production to oxidative phosphorylation. SDH dysfunction can lead to succinate accumulation, which may indirectly affect fumarate levels.
Fumarate hydration to malate
In simple terms: Fumarate is converted into malate by adding water.
Fumarate hydratase (FH) catalyzes the reversible hydration of fumarate to L-malate. This step is crucial for the TCA cycle to continue, as malate is subsequently oxidized to oxaloacetate. FH deficiency results in fumarate accumulation, which has been linked to tumorigenesis and metabolic reprogramming [4,8].
Fumarate as a signaling molecule
In simple terms: Fumarate can act as a signal that changes how cells behave.
Beyond its metabolic role, fumarate acts as a signaling molecule by inhibiting alpha-ketoglutarate-dependent dioxygenases, including histone and DNA demethylases. This inhibition leads to epigenetic changes that can promote cancer. Additionally, fumarate can modify cysteine residues on proteins through succination, affecting their function.
Fumarate in immune regulation
In simple terms: Fumarate helps control immune responses.
In macrophages, fumarate hydratase restrains mtRNA-mediated interferon production, indicating that fumarate metabolism is integral to innate immune signaling. This suggests that manipulating fumarate levels could modulate immune responses.
Fumarate and mitophagy
In simple terms: Fumarate can slow down the recycling of mitochondria.
Recent evidence indicates that fumarate hits the brakes on mitophagy, a process that removes damaged mitochondria. This regulation links fumarate metabolism to mitochondrial quality control and cell survival.
Key Genes Involved in GO:0006106 fumarate metabolic process
The following genes and proteins are central to fumarate metabolic process, encompassing enzymes, transporters, and regulatory factors.
| Gene | Major Role | Research Relevance |
|---|---|---|
| FH | Fumarate hydratase; converts fumarate to malate | Mutations cause HLRCC; fumarate accumulation as oncometabolite |
| SDHA | Succinate dehydrogenase subunit A; oxidizes succinate to fumarate | Component of TCA cycle and electron transport chain; mutations in SDH-related tumors |
| SDHB | Succinate dehydrogenase subunit B; iron-sulfur cluster | Mutations linked to pheochromocytoma and paraganglioma |
| SDHC | Succinate dehydrogenase subunit C; membrane anchor | Mutations in SDH-deficient tumors |
| SDHD | Succinate dehydrogenase subunit D; membrane anchor | Mutations in SDH-deficient tumors |
| MDH1 | Malate dehydrogenase 1; oxidizes malate to oxaloacetate | Cytosolic malate dehydrogenase; supports fumarate cycle |
| MDH2 | Malate dehydrogenase 2; mitochondrial | TCA cycle enzyme; links fumarate to oxaloacetate |
| ACO2 | Aconitase 2; converts citrate to isocitrate | Indirectly affects fumarate levels via TCA cycle |
| IDH1 | Isocitrate dehydrogenase 1; produces alpha-KG | Mutations alter TCA cycle and fumarate sensitivity |
| IDH2 | Isocitrate dehydrogenase 2; mitochondrial | Mutations affect TCA cycle and epigenetic regulation |
| GOT1 | Glutamic-oxaloacetic transaminase 1 | Links fumarate to aspartate metabolism |
| GOT2 | Glutamic-oxaloacetic transaminase 2 | Mitochondrial aspartate aminotransferase |
| ASS1 | Argininosuccinate synthase 1 | Uses fumarate in arginine biosynthesis |
| ASL | Argininosuccinate lyase | Produces fumarate in urea cycle |
| SLC25A1 | Mitochondrial citrate carrier | Transport of TCA intermediates |
| SLC25A10 | Mitochondrial dicarboxylate carrier | Transport of fumarate and malate |
| KEAP1 | Kelch-like ECH-associated protein 1 | Succination of KEAP1 by fumarate activates NRF2 |
| NFE2L2 | Nuclear factor erythroid 2-like 2 (NRF2) | Fumarate modifies KEAP1, activating NRF2 antioxidant response |
How Is fumarate metabolic process Regulated?
Fumarate metabolic process is regulated at multiple levels. The expression and activity of fumarate hydratase (FH) and succinate dehydrogenase (SDH) are controlled by transcriptional and post-translational mechanisms. For instance, FH is subject to regulation by hypoxia-inducible factors (HIFs) and metabolic stress. Additionally, fumarate itself can inhibit alpha-ketoglutarate-dependent dioxygenases, creating a feedback loop that affects epigenetic regulation. The accumulation of fumarate due to FH loss leads to succination of proteins, including KEAP1, which activates NRF2-mediated antioxidant responses. Furthermore, fumarate levels are influenced by mitochondrial dynamics and mitophagy, with fumarate acting as a brake on mitophagy. These regulatory mechanisms ensure that fumarate homeostasis is tightly linked to cellular metabolic state and stress responses.
fumarate metabolic process and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| FH | Hereditary leiomyomatosis and renal cell cancer (HLRCC) | FH knockout cell lines, HLRCC patient-derived xenografts |
| SDHB | Pheochromocytoma and paraganglioma | SDHB knockout mouse models, cell lines |
| KEAP1 | Fumarate-mediated NRF2 activation | KEAP1 mutant cell lines, succination assays |
| NFE2L2 | Antioxidant response in cancer | NRF2 overexpression or knockout models |
| FH | Ischemia-reperfusion injury | Mouse models of cardiac ischemia-reperfusion |
Fumarate hydratase deficiency and hereditary leiomyomatosis and renal cell cancer (HLRCC)
Germline mutations in FH cause HLRCC, an inherited disorder characterized by benign leiomyomas and aggressive renal cell carcinoma. Loss of FH leads to fumarate accumulation, which acts as an oncometabolite by inhibiting alpha-ketoglutarate-dependent dioxygenases, resulting in epigenetic reprogramming and activation of hypoxia-inducible pathways. This metabolic rewiring promotes tumorigenesis and provides potential targets for therapy.
Fumarate in ischemia-reperfusion injury
During ischemia, succinate accumulates and is rapidly oxidized upon reperfusion, driving mitochondrial ROS production and tissue damage. Fumarate is a downstream product of succinate oxidation, and its accumulation contributes to reperfusion injury. Targeting fumarate metabolism may offer cardioprotective strategies.
Fumarate and immune regulation
In macrophages, fumarate hydratase restrains mtRNA-mediated interferon production, linking fumarate metabolism to antiviral immunity. Dysregulation of this pathway may contribute to autoimmune or inflammatory diseases.
Fumarate as a target for metabolic imaging
Hyperpolarized [1-13C]fumarate is used in preclinical MRI to assess cell death and tumor response, as fumarate is converted to malate in viable cells. This technique enables non-invasive monitoring of fumarate metabolism in vivo.
From fumarate metabolic process-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does FH loss cause fumarate accumulation and tumorigenesis? | FH knockout cell lines and mouse models |
| How does fumarate inhibit alpha-KG-dependent dioxygenases? | In vitro enzyme assays with recombinant proteins |
| What is the role of fumarate in macrophage interferon production? | Macrophage-specific FH knockout mice |
| Can hyperpolarized fumarate imaging detect tumor response? | Preclinical cancer models with hyperpolarized 13C MRI |
| Does fumarate succination regulate KEAP1-NRF2 signaling? | Point mutations in KEAP1 cysteine residues |
| How does fumarate affect mitophagy? | Mitophagy reporter cell lines with FH modulation |
How to Study the fumarate metabolic process Process
| Method | What It Measures | Typical Application |
|---|---|---|
| LC-MS metabolomics | Fumarate and TCA cycle intermediate levels | Quantifying fumarate accumulation in cells/tissues |
| Hyperpolarized 13C MRI | Fumarate-to-malate conversion in vivo | Preclinical imaging of tumor response |
| Succination immunoblotting | Cysteine succination of proteins | Detecting fumarate-induced modifications |
| CRISPR knockout screening | Gene essentiality and fumarate sensitivity | Identifying regulators of fumarate metabolism |
| RNA-seq | Transcriptional changes upon fumarate accumulation | Epigenetic and metabolic gene expression profiling |
| ChIP-seq | Histone methylation changes | Assessing fumarate effects on epigenome |
| Seahorse respirometry | Mitochondrial respiration | Measuring TCA cycle flux and oxidative phosphorylation |
Metabolic profiling
Mass spectrometry-based metabolomics allows quantification of fumarate and other TCA cycle intermediates in cells and tissues. This method is essential for assessing fumarate accumulation in FH-deficient models.
Hyperpolarized 13C magnetic resonance imaging
Hyperpolarized [1-13C]fumarate is used for non-invasive imaging of fumarate metabolism in vivo, providing a readout of cell death and tumor response.
Succination assays
Detection of cysteine succination by fumarate using antibodies or mass spectrometry enables study of post-translational modifications and their functional consequences.
CRISPR screening
Genome-wide CRISPR knockout screens can identify genes that modulate fumarate sensitivity or resistance, uncovering novel regulators of fumarate metabolism.
How CRISPR Can Be Used to Study GO:0006106 fumarate metabolic process
Knockout
CRISPR knockout of FH or SDH genes in cell lines recapitulates fumarate accumulation and allows study of downstream effects on epigenetics, signaling, and tumorigenesis. For example, FH knockout cells exhibit increased fumarate levels and altered histone methylation.
Point Mutation
Introducing specific point mutations in FH or SDH genes via CRISPR can model patient-derived mutations, enabling structure-function studies and drug sensitivity testing. This approach helps dissect the impact of individual mutations on enzyme activity and fumarate levels.
Knock-in
Knock-in of tagged FH or SDH alleles allows for affinity purification and interactome studies, revealing novel binding partners and regulatory mechanisms. Tagged knock-in models also facilitate live-cell imaging of enzyme localization.
Overexpression
CRISPR activation (CRISPRa) or cDNA overexpression of FH can reduce fumarate levels and reverse oncometabolite effects, providing a gain-of-function approach to study fumarate metabolism. Overexpression models are useful for testing therapeutic strategies aimed at lowering fumarate.
How EDITGENE Supports fumarate metabolic process Research
Researchers studying fumarate metabolic process-related genes often need to determine whether a candidate gene is causally involved in fumarate accumulation, epigenetic regulation, or disease phenotypes. 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 fumarate metabolic process research.
Frequently Asked Questions About fumarate metabolic process
What is fumarate metabolic process?
Fumarate metabolic process (GO:0006106) is the set of chemical reactions involving fumarate, a key TCA cycle intermediate formed from succinate and converted to malate.
What genes are involved in fumarate metabolic process?
Key genes include FH, SDHA, SDHB, SDHC, SDHD, MDH1, MDH2, and others encoding TCA cycle enzymes and transporters [4,8].
How does fumarate act as an oncometabolite?
Fumarate inhibits alpha-ketoglutarate-dependent dioxygenases, including histone and DNA demethylases, leading to epigenetic changes that promote cancer.
What diseases are associated with fumarate metabolism?
FH mutations cause hereditary leiomyomatosis and renal cell cancer (HLRCC); fumarate accumulation also contributes to ischemia-reperfusion injury and immune dysregulation [1,2,4].
How is fumarate metabolism studied?
Methods include LC-MS metabolomics, hyperpolarized 13C MRI, succination assays, and CRISPR screening [3,5,6].
What is the role of fumarate hydratase (FH)?
FH catalyzes the reversible hydration of fumarate to malate; loss of FH leads to fumarate accumulation and tumorigenesis [4,8].
Can fumarate metabolism be targeted therapeutically?
Yes, strategies to lower fumarate or inhibit its downstream effects are under investigation for cancer and metabolic diseases [3,4].
What is fumarate succination?
Fumarate can modify cysteine residues on proteins via succination, altering protein function and contributing to cellular stress responses.
How does fumarate affect the immune system?
In macrophages, fumarate hydratase restrains mtRNA-mediated interferon production, linking fumarate metabolism to innate immunity.
What CRISPR models are available for fumarate metabolism research?
EDITGENE provides knockout, point mutation, knock-in, overexpression, and library screening services for genes like FH and SDH [4,5].
Conclusion
Fumarate metabolic process (GO:0006106) is a central metabolic pathway with far-reaching implications for cellular energetics, epigenetics, and disease. The accumulation of fumarate due to enzyme deficiencies or mutations drives oncogenesis, immune modulation, and oxidative stress, making it a critical area of research. Advances in CRISPR-based models and metabolic imaging continue to unravel the complexities of fumarate biology, offering new avenues for therapeutic intervention. EDITGENE stands ready to support researchers with tailored CRISPR solutions to explore this vital pathway.
References
- 1. Hooftman A et al.. 2023. Macrophage fumarate hydratase restrains mtRNA-mediated interferon production.. Nature 615(7952):490-498 PMID: 36890227
- 2. Chouchani ET et al.. 2014. Ischaemic accumulation of succinate controls reperfusion injury through mitochondrial ROS.. Nature 515(7527):431-435 PMID: 25383517
- 3. Guberovic I et al.. 2024. Functional implications of fumarate-induced cysteine succination.. Trends Biochem Sci 49(9):775-790 PMID: 38876954
- 4. Xiao M et al.. 2012. Inhibition of α-KG-dependent histone and DNA demethylases by fumarate and succinate that are accumulated in mutations of FH and SDH tumor suppressors.. Genes Dev 26(12):1326-38 PMID: 22677546
- 5. Briney CA et al.. 2019. Bioorthogonal oncometabolite ligation.. Methods Enzymol 622:431-448 PMID: 31155064
- 6. Gierse M et al.. 2023. Parahydrogen-Polarized Fumarate for Preclinical in Vivo Metabolic Magnetic Resonance Imaging.. J Am Chem Soc 145(10):5960-5969 PMID: 36857421
- 7. Magalhães Rebelo AP et al.. 2025. Fumarate hits the brakes on mitophagy.. Mol Cell 85(12):2261-2263 PMID: 40541163
- 8. Matsuda J et al.. 2002. [Mitochondrial fumarase].. Nihon Rinsho 60 Suppl 4:126-9 PMID: 12013833
