GO:0006108 malate metabolic process: Metabolic Hub, Genes, Functions and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0006108 malate metabolic process describes all chemical reactions and pathways involving malate, the anion of hydroxybutanedioic acid, a chiral hydroxydicarboxylic acid [QuickGO].
• Malate is a central intermediate in the TCA cycle and the glyoxylate cycle, and its (+) enantiomer is metabolically important [QuickGO].
• Malate shuttles and valves connect chloroplast, mitochondrial, and cytosolic metabolism, influencing redox balance and energy production in plants, algae, and animals [5,6,8].
• The malate-aspartate cycle is critical for heart metabolism, linking cytosolic and mitochondrial redox states.
• Malate metabolism is implicated in diverse physiological contexts, including bacterial malolactic fermentation, chemoreception, and cancer cell quiescence [2,3,1].
• Dysregulated malate metabolism contributes to septic shock, cancer, and mitochondrial dysfunction, making it a target for biomarker and therapeutic research [7,1,8].
Description
Malate metabolic process (GO:0006108) encompasses the chemical reactions and pathways involving malate, the anion of hydroxybutanedioic acid, a chiral hydroxydicarboxylic acid. The (+) enantiomer is an important intermediate in metabolism as a component of both the TCA cycle and the glyoxylate cycle [QuickGO]. This process is fundamental to cellular energy production, redox homeostasis, and biosynthetic pathways across all domains of life. In eukaryotes, malate is a key metabolite in the tricarboxylic acid (TCA) cycle, where it is oxidized to oxaloacetate by malate dehydrogenase, generating NADH. Beyond the TCA cycle, malate participates in the glyoxylate cycle, which allows organisms to use acetate or fatty acids as carbon sources [QuickGO]. Malate also serves as a mobile metabolite in shuttles that transfer reducing equivalents between cellular compartments, such as the malate-aspartate shuttle in heart and the malate valve in chloroplasts [4,5,6]. These shuttles are essential for maintaining redox balance and optimizing energy production under varying physiological conditions [5,6]. In plants and algae, malate circulation links chloroplast metabolism to mitochondrial reactive oxygen species (ROS) signaling, influencing stress responses and photosynthesis. In bacteria, malate metabolism supports malolactic fermentation, a process that generates metabolic energy through electrogenic malate uptake and malate/lactate antiport. Recent studies have also identified malate as a ligand for chemoreceptors, highlighting its role in sensory signaling. Given its central position in metabolism, malate metabolic process is a focal point for researchers studying cancer, cardiovascular disease, infectious diseases, and plant physiology [1,4,7,8]. Understanding the genes and regulatory mechanisms underlying this process is crucial for developing targeted interventions and biomarkers.
malate metabolic process At A Glance
| GO ID | GO:0006108 |
|---|---|
| GO term | malate metabolic process |
| Ontology | biological_process |
| Synonym | malate metabolism |
| Definition | The chemical reactions and pathways involving malate, the anion of hydroxybutanedioic acid, a chiral hydroxydicarboxylic acid. The (+) enantiomer is an important intermediate in metabolism as a component of both the TCA cycle and the glyoxylate cycle. |
| Major function | Central intermediate in TCA cycle and glyoxylate cycle; participates in redox shuttles and energy metabolism. |
| Related pathways | TCA cycle, glyoxylate cycle, malate-aspartate shuttle, malate valve, malolactic fermentation. |
| Key enzymes | Malate dehydrogenase (MDH), malic enzyme (ME), fumarase, malate synthase, malate dehydrogenase (decarboxylating). |
| Cellular locations | Mitochondria, cytoplasm, chloroplasts, peroxisomes. |
What Is GO:0006108?
The malate metabolic process (GO:0006108) is defined as the chemical reactions and pathways involving malate, the anion of hydroxybutanedioic acid, a chiral hydroxydicarboxylic acid. The (+) enantiomer is an important intermediate in metabolism as a component of both the TCA cycle and the glyoxylate cycle. This biological process includes the synthesis, conversion, transport, and utilization of malate in various metabolic contexts, such as energy production, redox balancing, and biosynthetic reactions [QuickGO].
Why Is malate metabolic process Important in Cell Biology?
Malate metabolic process is essential for cellular energy production, redox homeostasis, and biosynthetic pathways. It is a core component of the TCA cycle, which generates reducing equivalents for oxidative phosphorylation, and the glyoxylate cycle, which enables carbon assimilation from acetate or fatty acids [QuickGO]. Malate shuttles, such as the malate-aspartate shuttle and the malate valve, are critical for transferring reducing equivalents across organelle membranes, thereby maintaining optimal NADH/NAD+ ratios and supporting metabolic flexibility [4,5,6]. In plants and algae, malate circulation links chloroplast and mitochondrial metabolism, influencing ROS signaling and stress responses. In bacteria, malate metabolism drives malolactic fermentation, a process important for energy generation and food fermentation. Dysregulation of malate metabolism has been implicated in various diseases, including septic shock, cancer, and cardiovascular disorders, making it a significant area of biomedical research [1,4,7].
• Central to the TCA cycle, which is the primary pathway for energy production in aerobic organisms.
• Enables the glyoxylate cycle, allowing growth on acetate or fatty acids as sole carbon sources [QuickGO].
• Facilitates redox balance through malate-aspartate shuttle and malate valve, critical for mitochondrial function [4,5,6].
• Involved in plant and algal photosynthesis and ROS signaling via malate circulation.
• Supports bacterial malolactic fermentation, important for energy metabolism and food industry.
• Acts as a signaling molecule in chemoreception, as shown for MCP2201 sensing D-malate.
• Dysregulated in septic shock, where malate and other metabolites serve as potential biomarkers.
• Linked to cancer cell quiescence and metabolic reprogramming, with YAP-dependent mechanisms.
• Target for understanding mitochondrial dysfunction and metabolic diseases [4,8].
• Provides a model for studying metabolic compartmentalization and shuttle mechanisms [5,6].
What Happens During malate metabolic process?
Malate in the TCA Cycle
In simple terms: Malate is a key intermediate in the cycle that cells use to generate energy.
In the TCA cycle, malate is produced from fumarate by fumarase and is subsequently oxidized to oxaloacetate by malate dehydrogenase (MDH), generating NADH. This step is crucial for the continuation of the cycle and for the production of reducing equivalents that feed into oxidative phosphorylation. The reaction is reversible and depends on the NADH/NAD+ ratio, linking malate metabolism to the cellular redox state.
Malate in the Glyoxylate Cycle
In simple terms: Malate is part of a shortcut that lets some organisms turn fats into sugars.
The glyoxylate cycle bypasses the decarboxylation steps of the TCA cycle, allowing net synthesis of carbohydrates from acetyl-CoA. Malate synthase condenses glyoxylate with acetyl-CoA to form malate, which is then oxidized to oxaloacetate by MDH. This pathway is essential for growth on acetate or fatty acids in bacteria, fungi, and plants [QuickGO].
Malate Shuttles and Valves
In simple terms: Malate acts as a ferry that moves energy equivalents between different parts of the cell.
The malate-aspartate shuttle transfers reducing equivalents from cytosolic NADH to mitochondrial NADH, which is vital for cardiac and other tissues. In plants and algae, the malate valve exports excess reducing power from chloroplasts to mitochondria, protecting against photodamage and modulating ROS signaling [5,6,8]. These shuttle systems rely on malate dehydrogenases and specific transporters [5,6].
Malate in Bacterial Fermentation
In simple terms: Some bacteria use malate to generate energy during fermentation.
In malolactic fermentation, bacteria such as Lactococcus and Oenococcus take up malate and convert it to lactate via malate/lactate antiport, generating a proton motive force and metabolic energy. This process is important in food fermentation and contributes to the flavor and stability of wine and dairy products.
Malate as a Signaling Molecule
In simple terms: Malate can also act as a signal that cells sense and respond to.
Recent studies have identified chemoreceptors that specifically sense D-malate, such as MCP2201, linking malate metabolism to sensory signaling pathways. This expands the role of malate beyond intermediary metabolism to include environmental sensing and cellular communication.
Key Genes Involved in GO:0006108 malate metabolic process
The following genes and proteins are key players in malate metabolic process, encompassing enzymes, transporters, and regulatory factors.
| Gene | Major Role | Research Relevance |
|---|---|---|
| MDH1 | Cytosolic malate dehydrogenase; catalyzes malate to oxaloacetate | Redox shuttle, cancer metabolism |
| MDH2 | Mitochondrial malate dehydrogenase; TCA cycle | Energy metabolism, mitochondrial disorders |
| ME1 | Malic enzyme 1; converts malate to pyruvate and NADPH | Lipogenesis, cancer |
| ME2 | Malic enzyme 2; mitochondrial malate to pyruvate | TCA cycle anaplerosis, tumor suppression |
| ME3 | Malic enzyme 3; mitochondrial | Insulin secretion, cancer |
| FH | Fumarase; converts fumarate to malate | TCA cycle, hereditary leiomyomatosis |
| MS | Malate synthase; glyoxylate cycle | Microbial pathogenesis, plant metabolism |
| DIC | Dicarboxylate carrier; transports malate across mitochondrial membrane | Shuttle function, metabolic disorders |
| OGC | Oxoglutarate carrier; malate/alpha-ketoglutarate exchange | Redox balance, cancer |
| SLC25A1 | Mitochondrial citrate carrier; indirectly affects malate | Metabolic reprogramming |
| MCP2201 | Chemoreceptor sensing D-malate | Bacterial chemotaxis, signaling |
| YAP1 | Transcriptional regulator; mediates metabolic reprogramming in quiescence | Contact inhibition, cancer dormancy |
| LDHA | Lactate dehydrogenase A; links malate/lactate antiport | Fermentation, cancer |
| MDH (bacterial) | Malate dehydrogenase in bacteria | Malolactic fermentation, energy production |
| MAE1 | Malic enzyme in plants/algae | Photosynthesis, ROS signaling |
| NADP-ME | NADP-dependent malic enzyme | C4 photosynthesis, stress responses |
| PEPCK | Phosphoenolpyruvate carboxykinase; uses oxaloacetate from malate | Gluconeogenesis, metabolic flux |
How Is malate metabolic process Regulated?
Malate metabolic process is regulated at multiple levels, including transcriptional control of malate dehydrogenases and malic enzymes, post-translational modifications, and allosteric regulation by metabolites such as NADH/NAD+ and acetyl-CoA [4,5]. In plants, the malate valve is modulated by light and redox signals, affecting chloroplast-mitochondria communication [5,6,8]. In cancer cells, YAP-dependent and YAP-independent mechanisms reprogram malate metabolism during contact inhibition-induced quiescence, highlighting the interplay between signaling pathways and metabolic enzymes. Bacterial malate metabolism is regulated by environmental factors and membrane transport systems. Additionally, malate serves as a ligand for chemoreceptors, influencing bacterial behavior.
malate metabolic process and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| ME1 | Cancer (e.g., hepatocellular carcinoma) | Knockout in cancer cell lines; xenograft models |
| MDH2 | Mitochondrial disorders, cancer | Point mutation knock-in in cell lines; organoids |
| FH | Hereditary leiomyomatosis and renal cell cancer | Knockout in renal cells; mouse models |
| YAP1 | Cancer dormancy, quiescence | Overexpression and knockout in cancer cells; contact inhibition assays |
| SLC25A1 | Neuromuscular disorders, cancer | Knockout in neurons; metabolic flux analysis |
Malate Metabolism in Cancer
Dysregulated malate metabolism is a hallmark of many cancers. Malic enzyme 1 (ME1) and ME2 are often overexpressed in tumors, providing NADPH for biosynthesis and supporting proliferation. In contact inhibition-induced quiescence, metabolic and transcriptomic reprogramming involves YAP-dependent and YAP-independent mechanisms that alter malate metabolism, suggesting a role in tumor dormancy and recurrence. Targeting malate enzymes is being explored as a therapeutic strategy.
Malate Metabolism in Cardiovascular Disease
The malate-aspartate cycle is critical for cardiac function, as it maintains the redox balance necessary for efficient energy production in the heart. Impaired malate metabolism has been linked to cardiac hypertrophy and heart failure, making it a potential target for cardiovascular therapies.
Malate Metabolism in Septic Shock
Metabolic profiling in septic shock has identified malate as a potential biomarker, alongside lactate, reflecting altered cellular metabolism and organ dysfunction. Monitoring malate levels may aid in diagnosis and prognosis of septic shock.
Malate Metabolism in Plant Stress and ROS Signaling
In plants and algae, malate circulation links chloroplast metabolism to mitochondrial ROS production, influencing stress responses and programmed cell death. Disruption of malate shuttles leads to increased sensitivity to oxidative stress, highlighting their importance in plant immunity and abiotic stress tolerance.
From malate metabolic process-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does loss of MDH2 affect TCA cycle flux? | MDH2 knockout cell lines (e.g., HEK293) with metabolic flux analysis |
| How does ME1 overexpression impact NADPH levels? | ME1 overexpression in cancer cell lines; NADPH/NADP+ assays |
| What is the role of YAP1 in malate metabolic reprogramming? | YAP1 knockout and overexpression in contact-inhibited cells; transcriptomics |
| Can point mutations in FH alter malate metabolism? | FH point-mutation knock-in cell lines; enzyme activity assays |
| How does malate shuttle dysfunction affect cardiac function? | Cardiomyocyte-specific knockout of MDH1/2; mouse models |
| Does malate chemoreceptor MCP2201 mediate chemotaxis? | MCP2201 knockout in bacteria; chemotaxis assays |
How to Study the malate metabolic process Process
| Method | What It Measures | Typical Application |
|---|---|---|
| 13C metabolic flux analysis | Flux through malate and TCA cycle | Quantifying metabolic reprogramming in cancer |
| RNA-seq | Transcript levels of malate enzymes | Identifying regulatory changes in quiescence |
| Proteomics | Protein abundance of malate enzymes | Validating expression changes post-perturbation |
| Enzyme activity assay | Catalytic activity of MDH, ME, FH | Functional validation of mutations |
| NADH/NAD+ sensor imaging | Real-time redox state | Live-cell metabolic studies |
| Seahorse respirometry | Oxygen consumption rate | Assessing mitochondrial function |
| Metabolomics (LC-MS) | Malate and related metabolite levels | Biomarker discovery in septic shock |
| Chemotaxis assay | Bacterial sensing of malate | Characterizing MCP2201 function |
Metabolic Flux Analysis
Metabolic flux analysis using 13C-labeled substrates (e.g., 13C-malate or 13C-glucose) coupled with mass spectrometry allows quantification of malate turnover and its contribution to TCA cycle and biosynthetic pathways [1,4]. This method is essential for understanding how genetic perturbations alter malate metabolism.
Transcriptomics and Proteomics
RNA-seq and proteomics can reveal changes in expression of malate-metabolizing enzymes (MDH, ME, FH) under different conditions, such as contact inhibition or stress [1,5]. These approaches help identify regulatory networks and potential therapeutic targets.
Enzyme Activity Assays
Spectrophotometric assays measuring NADH/NADPH production or consumption are used to assess the activity of malate dehydrogenase, malic enzyme, and fumarase in cell lysates or purified preparations [4,6]. These assays are critical for validating the functional impact of mutations.
Live-Cell Imaging of NADH/NAD+
Genetically encoded fluorescent sensors (e.g., Peredox, SoNar) enable real-time monitoring of NADH/NAD+ ratios in live cells, providing insights into how malate shuttles affect cellular redox state [5,8]. This technique is particularly useful in studying compartmentalized metabolism.
How CRISPR Can Be Used to Study GO:0006108 malate metabolic process
Knockout
CRISPR knockout of malate-metabolizing genes (e.g., MDH2, ME1, FH) in cell lines enables loss-of-function studies to determine their role in TCA cycle flux, redox balance, and cell proliferation [1,4]. Knockout models are essential for validating metabolic dependencies and identifying synthetic lethal interactions.
Point Mutation
Introducing specific point mutations (e.g., in FH or MDH2) via CRISPR base editing or homology-directed repair allows researchers to mimic disease-associated variants and study their impact on enzyme activity and malate metabolism [4,6]. These models are valuable for understanding hereditary cancer syndromes.
Knock-in
Knock-in of tagged versions of malate enzymes (e.g., GFP-MDH2) using CRISPR facilitates live-cell imaging and proteomic analysis of localization and interactions [5,8]. This approach helps dissect compartment-specific functions of malate metabolism.
Overexpression
CRISPR activation (CRISPRa) or lentiviral overexpression of malate enzymes (e.g., ME1) can model metabolic reprogramming in cancer and identify downstream effects on NADPH production and lipogenesis. Overexpression studies complement knockout approaches to reveal gain-of-function phenotypes.
How EDITGENE Supports malate metabolic process Research
Researchers studying malate metabolic process-related genes often need to determine whether a candidate gene is causally involved in metabolic regulation, disease progression, or stress responses. Generating precise genetic models is critical to establish causality and to dissect the molecular mechanisms underlying malate metabolism.
Contact EDITGENE today to design your custom CRISPR model for malate metabolic process research.
Frequently Asked Questions About malate metabolic process
What is GO:0006108 malate metabolic process?
GO:0006108 is a Gene Ontology biological process term describing the chemical reactions and pathways involving malate, the anion of hydroxybutanedioic acid, a chiral hydroxydicarboxylic acid. The (+) enantiomer is an important intermediate in metabolism as a component of both the TCA cycle and the glyoxylate cycle [QuickGO].
What genes are involved in malate metabolic process?
Key genes include MDH1, MDH2, ME1, ME2, ME3, FH, MS, DIC, OGC, SLC25A1, and MCP2201, among others. These encode enzymes and transporters that catalyze or regulate malate conversion and transport [4,5,6].
Why is malate important in the TCA cycle?
Malate is oxidized to oxaloacetate by malate dehydrogenase, generating NADH and sustaining the TCA cycle for energy production.
How is malate metabolism linked to cancer?
Malate enzymes such as ME1 and MDH2 are often dysregulated in cancer, supporting NADPH production and metabolic reprogramming. YAP-dependent mechanisms mediate malate metabolic changes during quiescence.
What is the malate-aspartate shuttle?
The malate-aspartate shuttle transfers reducing equivalents from cytosolic NADH to mitochondria, essential for cardiac and other tissues.
Can malate be used as a biomarker?
Yes, malate has been identified as a potential biomarker in septic shock, alongside lactate, reflecting metabolic alterations.
What is the role of malate in plants?
In plants and algae, malate shuttles (malate valves) balance redox and link chloroplast metabolism to mitochondrial ROS signaling [5,6,8].
How do bacteria use malate?
Bacteria use malate in malolactic fermentation to generate energy via electrogenic malate uptake and malate/lactate antiport. Malate also serves as a chemoreceptor ligand.
What experimental models are used to study malate metabolism?
Common models include CRISPR knockout cell lines, point mutation knock-ins, overexpression lines, and metabolic flux analysis using 13C-labeled substrates [1,4,5].
How can EDITGENE help with malate metabolism research?
EDITGENE provides custom CRISPR knockout, point mutation, knock-in, overexpression cell models, and CRISPR library screening services tailored to malate metabolism genes.
Conclusion
Malate metabolic process (GO:0006108) is a fundamental biological process that intersects with energy production, redox homeostasis, and biosynthetic pathways. Its dysregulation is implicated in cancer, cardiovascular disease, septic shock, and plant stress responses. Understanding the genes and regulatory mechanisms of malate metabolism offers opportunities for biomarker discovery and therapeutic intervention. Advanced CRISPR models and metabolic profiling techniques are essential tools for dissecting this pathway and translating findings into clinical and agricultural applications.
References
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- 2. Poolman B et al.. 1991. Malolactic fermentation: electrogenic malate uptake and malate/lactate antiport generate metabolic energy.. J Bacteriol 173(19):6030-7 PMID: 1917837
- 3. Cui R et al.. 2025. Insights into Chemoreceptor MCP2201-Sensing D-Malate.. Int J Mol Sci 26(10) PMID: 40430039
- 4. Safer B. 1975. The Metabolic Significance of the Malate-Aspartate Cycle in Heart.. Circ Res 37(5):527-33 PMID: 172258
- 5. Dao O et al.. 2022. Physiological functions of malate shuttles in plants and algae.. Trends Plant Sci 27(5):488-501 PMID: 34848143
- 6. Selinski J et al.. 2019. Malate valves: old shuttles with new perspectives.. Plant Biol (Stuttg) 21 Suppl 1(Suppl Suppl 1):21-30 PMID: 29933514
- 7. Yang H et al.. 2020. Potential biomarkers in septic shock besides lactate.. Exp Biol Med (Maywood) 245(12):1066-1072 PMID: 32276542
- 8. Zhao Y et al.. 2020. Malate Circulation: Linking Chloroplast Metabolism to Mitochondrial ROS.. Trends Plant Sci 25(5):446-454 PMID: 32304657
