GO:0046487 glyoxylate metabolic process: Pathway, Genes, Functions and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0046487 glyoxylate metabolic process describes all chemical reactions and pathways involving glyoxylate, the anion of glyoxylic acid.
• The glyoxylate shunt and photorespiratory glycolate-glyoxylate metabolism are the two most studied routes for glyoxylate production and consumption.
• Key enzymes include isocitrate lyase (ICL), malate synthase (MLS), alanine:glyoxylate aminotransferase (AGT), and glyoxylate reductase/hydroxypyruvate reductase (GRHPR).
• Defects in glyoxylate metabolism cause primary hyperoxaluria, a severe kidney stone disease, due to excessive oxalate production.
• The glyoxylate cycle supports microbial adaptation to alternative carbon sources and is a potential antifungal target.
• Glyoxylate metabolism is evolutionarily ancient and is studied in origins-of-life and prebiotic chemistry research.
Description
Glyoxylate metabolic process (GO:0046487) is defined as the chemical reactions and pathways involving glyoxylate, the anion of glyoxylic acid (HOC-COOH). This process is central to carbon flux in plants, bacteria, fungi, and some protists, and it intersects with photorespiration, the glyoxylate shunt, and amino acid metabolism. In plants, photorespiratory glycolate-glyoxylate metabolism is essential for recycling carbon during photosynthesis and for limiting the loss of fixed carbon. In microorganisms, the glyoxylate shunt allows growth on C2 compounds such as acetate and ethanol, bypassing the CO2-releasing steps of the TCA cycle. The glyoxylate cycle, first described over 60 years ago, remains a paradigm for metabolic adaptation and a target for antimicrobial drug discovery. In humans, glyoxylate is a key intermediate whose dysregulation leads to primary hyperoxaluria, a life-threatening condition characterized by calcium oxalate kidney stones and systemic oxalosis. Because glyoxylate sits at the crossroads of multiple metabolic pathways, understanding its metabolism is critical for basic biology, biotechnology, and medicine. This article synthesizes authoritative QuickGO annotation and verified PubMed literature to provide a research-grade overview of GO:0046487, its genes, mechanisms, disease links, and experimental models.
glyoxylate metabolic process At A Glance
| GO ID | GO:0046487 |
|---|---|
| GO term | glyoxylate metabolic process |
| Ontology | biological_process |
| Synonym | glyoxylate metabolism |
| Definition | The chemical reactions and pathways involving glyoxylate, the anion of glyoxylic acid, HOC-COOH. |
| Major function | Carbon flux, photorespiration, glyoxylate shunt, amino acid metabolism, and oxalate homeostasis. |
| Key enzymes | Isocitrate lyase (ICL), malate synthase (MLS), alanine:glyoxylate aminotransferase (AGT), glyoxylate reductase/hydroxypyruvate reductase (GRHPR). |
| Associated diseases | Primary hyperoxaluria, kidney stone disease, and microbial infections. |
| Evolutionary significance | Ancient pathway relevant to prebiotic chemistry and origins of life. |
What Is GO:0046487?
GO:0046487 glyoxylate metabolic process encompasses all biochemical reactions and pathways in which glyoxylate (the anion of glyoxylic acid, HOC-COOH) is a substrate, product, or intermediate. This includes the glyoxylate cycle, photorespiratory glycolate-glyoxylate metabolism, and reactions that interconvert glyoxylate with glycine, glycolate, oxalate, and malate. The term is a biological process in the Gene Ontology and is synonymous with glyoxylate metabolism.
Why Is glyoxylate metabolic process Important in Cell Biology?
Glyoxylate metabolic process is fundamentally important because it links carbon and nitrogen metabolism, detoxifies photorespiratory intermediates, and enables microbial survival on non-fermentable carbon sources. In plants, it is essential for photorespiration, which affects crop yield and stress tolerance. In pathogens such as Candida glabrata and Mycobacterium tuberculosis, the glyoxylate shunt is required for virulence and persistence, making it an attractive drug target. In humans, inherited defects in glyoxylate-metabolizing enzymes cause primary hyperoxaluria, a devastating disease with limited treatment options. Moreover, glyoxylate chemistry is studied in the context of the origin of life, as it may have been part of ancient metabolic networks before enzymes evolved. Thus, research on GO:0046487 spans agriculture, infectious disease, nephrology, and evolutionary biology.
• Enables microbial growth on C2 compounds via the glyoxylate shunt, a key metabolic adaptation.
• Essential for plant photorespiration and carbon recycling, impacting crop productivity.
• Dysregulation causes primary hyperoxaluria and kidney stone disease in humans.
• Provides a target for antifungal and antibacterial drug development.
• Serves as a model for prebiotic metabolic pathways and origins-of-life research.
• Connects to amino acid metabolism, particularly glycine and serine interconversion.
• Regulates oxalate homeostasis, with implications for kidney and liver function.
• Involved in the virulence of fungal pathogens like Candida glabrata.
• Studied in Euglena and other protists for C2 metabolism and metabolic flexibility.
• Offers insights into metabolic reprogramming in cancer and immune cells.
What Happens During glyoxylate metabolic process?
Glyoxylate Shunt and the Glyoxylate Cycle
In simple terms: This is a shortcut that lets cells use fats and acetate for energy without losing carbon as CO2.
The glyoxylate shunt is a variant of the TCA cycle that bypasses the two decarboxylation steps, allowing net carbon assimilation from acetyl-CoA. In this pathway, isocitrate is cleaved by isocitrate lyase (ICL) into succinate and glyoxylate; glyoxylate then condenses with acetyl-CoA to form malate, catalyzed by malate synthase (MLS). This cycle is critical for growth on acetate, ethanol, or fatty acids in bacteria, fungi, and plants. In Candida glabrata, the glyoxylate cycle supports adaptation to alternative carbon sources and contributes to virulence. The glyoxylate shunt is also present in some protists, such as Euglena, where C2 metabolism is studied.
Photorespiratory Glycolate-Glyoxylate Metabolism
In simple terms: In plants, this pathway recycles a wasteful byproduct of photosynthesis back into useful molecules.
During photorespiration, the enzyme Rubisco oxygenates ribulose-1,5-bisphosphate, producing 2-phosphoglycolate, which is converted to glycolate and then to glyoxylate. Glyoxylate is subsequently transaminated to glycine by alanine:glyoxylate aminotransferase (AGT) or serine:glyoxylate aminotransferase. This pathway is essential for carbon recovery and nitrogen recycling in plants, and its manipulation can affect photosynthetic efficiency and yield. Mutations in photorespiratory enzymes lead to growth defects under ambient conditions.
Glyoxylate Detoxification and Oxalate Metabolism
In simple terms: The body converts toxic glyoxylate into less harmful substances to prevent kidney stones.
In humans, glyoxylate is detoxified primarily by alanine:glyoxylate aminotransferase (AGT) in peroxisomes, which converts it to glycine, and by glyoxylate reductase/hydroxypyruvate reductase (GRHPR), which reduces it to glycolate. When these enzymes are deficient, glyoxylate accumulates and is oxidized to oxalate, leading to calcium oxalate deposition in kidneys and other tissues, as seen in primary hyperoxaluria. The liver-specific sulfate-oxalate exchanger SAT-1 (SLC26A1) is regulated by glyoxylate, providing a metabolic link between liver and kidney.
Prebiotic and Ancient Metabolic Pathways
In simple terms: Glyoxylate may have been part of the first chemical reactions that led to life.
Glyoxylate is considered a key intermediate in prebiotic chemistry, as it can be formed from simple molecules like formaldehyde and cyanide under early Earth conditions. Experimental recreations of ancient metabolic pathways have shown that glyoxylate can participate in non-enzymatic reactions that produce amino acids and other biomolecules. These studies suggest that glyoxylate metabolism may predate the emergence of enzymes and provide insights into the origin of life.
Key Genes Involved in GO:0046487 glyoxylate metabolic process
The following genes and enzymes are central to glyoxylate metabolic process, as supported by published literature.
| Gene | Major Role | Research Relevance |
|---|---|---|
| ICL1 | Isocitrate lyase, cleaves isocitrate to succinate and glyoxylate in the glyoxylate shunt | Target for antifungal and antibacterial drugs; virulence factor in Candida glabrata |
| MLS1 | Malate synthase, condenses glyoxylate with acetyl-CoA to form malate | Essential for glyoxylate cycle; studied in microbial adaptation |
| AGT | Alanine:glyoxylate aminotransferase, converts glyoxylate to glycine in peroxisomes | Mutations cause primary hyperoxaluria type 1 |
| GRHPR | Glyoxylate reductase/hydroxypyruvate reductase, reduces glyoxylate to glycolate | Mutations cause primary hyperoxaluria type 2 |
| HOGA1 | 4-hydroxy-2-oxoglutarate aldolase, involved in glyoxylate metabolism | Mutations cause primary hyperoxaluria type 3 |
| SLC26A1 | Sulfate-oxalate exchanger regulated by glyoxylate | Links liver glyoxylate metabolism to kidney oxalate handling |
| GLO1 | Glyoxalase I, related to glyoxylate detoxification | Studied in metabolic stress and detoxification |
| GLO2 | Glyoxalase II, related to glyoxylate detoxification | Studied in metabolic stress and detoxification |
| SHMT | Serine hydroxymethyltransferase, interconverts serine and glycine, linked to glyoxylate | Photorespiratory metabolism in plants |
| SGAT | Serine:glyoxylate aminotransferase, converts glyoxylate to glycine in photorespiration | Plant photorespiration and carbon recovery |
| GGAT | Glutamate:glyoxylate aminotransferase, alternative route for glyoxylate transamination | Photorespiration and nitrogen recycling |
| PGLP | Phosphoglycolate phosphatase, produces glycolate from 2-phosphoglycolate | Photorespiratory pathway |
| GOX | Glycolate oxidase, oxidizes glycolate to glyoxylate | Photorespiration and reactive oxygen species production |
| MS | Malate synthase, same as MLS1 in some organisms | Glyoxylate cycle |
| ICL | Isocitrate lyase, same as ICL1 in some organisms | Glyoxylate shunt |
| ACS | Acetyl-CoA synthetase, provides acetyl-CoA for glyoxylate cycle | Microbial C2 metabolism |
| PCK | Phosphoenolpyruvate carboxykinase, linked to gluconeogenesis from glyoxylate cycle | Metabolic adaptation |
| Euglena ICL | Isocitrate lyase in Euglena gracilis | C2 metabolism in protists |
How Is glyoxylate metabolic process Regulated?
Glyoxylate metabolic process is regulated at multiple levels. In microorganisms, the glyoxylate shunt is induced when cells grow on C2 compounds, and is repressed by glucose via carbon catabolite repression. In Candida glabrata, the transcription factors that control ICL1 and MLS1 expression are important for adaptation to alternative carbon sources. In plants, photorespiratory enzymes are regulated by light and metabolic signals, and their expression changes under stress conditions. In humans, the expression of the sulfate-oxalate exchanger SAT-1 (SLC26A1) is regulated by glyoxylate, suggesting a metabolic feedback loop between liver and kidney. Additionally, the glyoxylate cycle is subject to post-translational regulation, such as phosphorylation and acetylation, although specific mechanisms vary by organism.
glyoxylate metabolic process and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| AGT | Primary hyperoxaluria type 1 | AGT knockout hepatocytes or mouse models; point mutations to mimic human variants |
| GRHPR | Primary hyperoxaluria type 2 | GRHPR knockout cell lines; overexpression of wild-type and mutant GRHPR |
| HOGA1 | Primary hyperoxaluria type 3 | HOGA1 knockout cells; knock-in of patient mutations |
| ICL1 | Fungal virulence and drug resistance | ICL1 knockout Candida glabrata; overexpression for gain-of-function studies |
| MLS1 | Microbial glyoxylate cycle | MLS1 knockout bacteria or fungi; tagged knock-in for localization |
Primary Hyperoxaluria
Primary hyperoxaluria is a group of inherited disorders caused by defects in glyoxylate-metabolizing enzymes, leading to excessive oxalate production and calcium oxalate kidney stones. The most common form, primary hyperoxaluria type 1, is caused by mutations in the AGT gene, which encodes alanine:glyoxylate aminotransferase. Type 2 results from GRHPR deficiency, and type 3 from HOGA1 mutations. These conditions can progress to end-stage renal disease and systemic oxalosis, requiring combined liver-kidney transplantation in severe cases. Research on glyoxylate metabolism is therefore directly relevant to developing new therapies for hyperoxaluria.
Microbial Infections and Drug Targets
The glyoxylate shunt is essential for the virulence of several pathogens, including Candida glabrata, Mycobacterium tuberculosis, and Pseudomonas aeruginosa. In Candida glabrata, the glyoxylate cycle supports survival in host niches and resistance to antifungal drugs. Because the shunt is absent in humans, enzymes like isocitrate lyase and malate synthase are attractive targets for selective antimicrobial drugs. Inhibitors of these enzymes are being explored as potential treatments for fungal and bacterial infections.
Metabolic Reprogramming in Cancer
Cancer cells often exhibit altered metabolism, and some tumors express glyoxylate cycle enzymes to support growth under nutrient-limited conditions. Although the role of glyoxylate metabolism in cancer is less well understood than in microbes, it is an area of active investigation. Targeting glyoxylate-metabolizing enzymes could potentially disrupt metabolic flexibility in cancer cells.
From glyoxylate metabolic process-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does loss of AGT cause glyoxylate accumulation and oxalate production? | AGT knockout hepatocytes or mouse models |
| Can point mutations in GRHPR mimic primary hyperoxaluria type 2? | GRHPR point-mutation knock-in cell lines |
| Is ICL1 required for Candida glabrata virulence? | ICL1 knockout in Candida glabrata; infection models |
| How does glyoxylate regulate SLC26A1 expression? | SLC26A1 promoter-reporter knock-in; overexpression of glyoxylate-metabolizing enzymes |
| What is the subcellular localization of MLS1? | MLS1 tagged knock-in with fluorescent protein |
| Can overexpression of AGT reduce oxalate levels? | AGT overexpression in hepatocytes or animal models |
How to Study the glyoxylate metabolic process Process
| Method | What It Measures | Typical Application |
|---|---|---|
| RNA-seq | Gene expression changes | Identify genes co-regulated with glyoxylate metabolism |
| CRISPR library screening | Fitness of gene knockouts under specific conditions | Discover essential genes for growth on acetate or glyoxylate |
| Metabolomics (LC-MS/GC-MS) | Levels of glyoxylate, glycolate, oxalate, glycine | Diagnose primary hyperoxaluria; study microbial metabolism |
| Enzyme activity assay | Catalytic activity of ICL, MLS, AGT, GRHPR | Characterize mutant enzymes; screen inhibitors |
| Western blot | Protein expression levels | Validate knockout or overexpression models |
| Fluorescence microscopy | Subcellular localization of tagged proteins | Determine peroxisomal or mitochondrial targeting |
| CRISPR knockout | Loss-of-function phenotypes | Study gene essentiality in glyoxylate metabolism |
| Overexpression | Gain-of-function effects | Test if increased enzyme activity reduces oxalate |
Genomic and Transcriptomic Approaches
RNA-seq and microarray analyses can identify genes co-expressed with glyoxylate-metabolizing enzymes under different conditions, such as growth on acetate versus glucose. In plants, transcriptomics has revealed photorespiratory gene networks. CRISPR library screening can systematically test which genes are required for growth on C2 compounds or for resistance to glyoxylate stress.
Proteomics and Metabolomics
Mass spectrometry-based proteomics can quantify enzymes like ICL1, MLS1, AGT, and GRHPR in cells and tissues. Metabolomics allows direct measurement of glyoxylate, glycolate, oxalate, and glycine levels, providing a functional readout of pathway activity. These methods are essential for studying primary hyperoxaluria and microbial metabolism.
Enzyme Activity Assays
In vitro enzyme assays using purified recombinant proteins can measure isocitrate lyase, malate synthase, and aminotransferase activities. These assays are used to screen for inhibitors and to characterize mutant enzymes from patients. For example, AGT activity can be measured in liver biopsies to diagnose primary hyperoxaluria type 1.
Imaging and Localization Studies
Fluorescence microscopy of tagged enzymes (e.g., GFP-AGT) can reveal subcellular localization, such as peroxisomal targeting. In plants, imaging of photorespiratory intermediates is used to study pathway dynamics. These approaches help link enzyme function to cellular compartments.
How CRISPR Can Be Used to Study GO:0046487 glyoxylate metabolic process
Knockout
CRISPR knockout of genes such as AGT, GRHPR, ICL1, or MLS1 can create cell models that mimic enzyme deficiencies, allowing researchers to study metabolic consequences like glyoxylate accumulation and oxalate production. These models are valuable for drug screening and for understanding disease mechanisms.
Point Mutation
Introducing specific point mutations found in primary hyperoxaluria patients (e.g., in AGT or GRHPR) using CRISPR base editing or homology-directed repair can recreate disease-causing alleles in cell lines. Such models help dissect the functional impact of individual mutations and test personalized therapies.
Knock-in
Knock-in of tagged versions of glyoxylate-metabolizing enzymes (e.g., GFP-AGT) allows real-time tracking of protein localization and dynamics. Knock-in of reporter genes under the control of endogenous promoters can be used to study regulation by glyoxylate.
Overexpression
CRISPR activation (CRISPRa) or lentiviral overexpression can increase the expression of enzymes like AGT or GRHPR to test whether enhanced activity reduces oxalate levels. Overexpression models are also used to study the effects of glyoxylate cycle enzymes on microbial virulence.
How EDITGENE Supports glyoxylate metabolic process Research
Researchers studying glyoxylate metabolic process-related genes often need to determine whether a candidate gene is causally involved in pathway regulation, disease pathogenesis, or drug response. EDITGENE provides a comprehensive suite of CRISPR-based services to accelerate this research, from gene knockout to precise point mutations and library screening.
Contact EDITGENE today to design your custom CRISPR model for glyoxylate metabolic process research.
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Frequently Asked Questions About glyoxylate metabolic process
What is glyoxylate metabolic process?
Glyoxylate metabolic process (GO:0046487) is the set of chemical reactions and pathways involving glyoxylate, the anion of glyoxylic acid, including the glyoxylate cycle and photorespiration.
What genes are involved in glyoxylate metabolic process?
Key genes include ICL1, MLS1, AGT, GRHPR, HOGA1, and SLC26A1, among others.
What diseases are associated with glyoxylate metabolism?
Defects cause primary hyperoxaluria, a kidney stone disease; the pathway is also linked to microbial virulence.
How is glyoxylate metabolized in humans?
Glyoxylate is detoxified by AGT to glycine and by GRHPR to glycolate; deficiency leads to oxalate accumulation.
What is the glyoxylate shunt?
The glyoxylate shunt is a metabolic pathway that bypasses CO2-producing steps of the TCA cycle, allowing net carbon assimilation from acetyl-CoA.
Why is glyoxylate metabolism important in plants?
It is essential for photorespiration, recycling carbon and nitrogen, and affecting crop yield.
How can I study glyoxylate metabolic process using CRISPR?
CRISPR knockout, point mutation, knock-in, and overexpression models can be used to dissect gene function and disease mechanisms.
What model organisms are used to study glyoxylate metabolism?
Common models include bacteria, fungi like Candida glabrata, plants like Arabidopsis, and mammalian cell lines.
Is glyoxylate metabolism related to the origin of life?
Yes, glyoxylate is thought to be a prebiotic intermediate in ancient metabolic pathways.
What are the research methods for glyoxylate metabolic process?
Methods include RNA-seq, metabolomics, enzyme activity assays, CRISPR screening, and fluorescence microscopy.
Conclusion
Glyoxylate metabolic process (GO:0046487) is a fundamental biological pathway with broad relevance across plants, microbes, and humans. Its roles in photorespiration, the glyoxylate shunt, and oxalate homeostasis make it a key area for understanding metabolic adaptation and disease. Dysregulation of glyoxylate metabolism causes primary hyperoxaluria and contributes to microbial virulence, highlighting its clinical and biotechnological importance. Continued research using CRISPR-based models and advanced omics will further elucidate the regulation and therapeutic potential of this pathway.
References
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- 2. Speijer D. 2019. On the Likelihood of Life Originating.. Bioessays 41(9):e1900085 PMID: 31298417
- 3. Muchowska KB et al.. 2019. Recreating ancient metabolic pathways before enzymes.. Bioorg Med Chem 27(12):2292-2297 PMID: 30871860
- 4. Nakazawa M. 2017. C2 metabolism in Euglena.. Adv Exp Med Biol 979:39-45 PMID: 28429316
- 5. Dolan SK et al.. 2018. The Glyoxylate Shunt, 60 Years On.. Annu Rev Microbiol 72:309-330 PMID: 30200852
- 6. Watts RW. 1997. Primary hyperoxaluria.. Contrib Nephrol 122:143-59 PMID: 9399058
- 7. Chew SY et al.. 2019. The glyoxylate cycle and alternative carbon metabolism as metabolic adaptation strategies of Candida glabrata: perspectives from Candida albicans and Saccharomyces cerevisiae.. J Biomed Sci 26(1):52 PMID: 31301737
- 8. Stieger B. 2011. Regulation of the expression of the hepatocellular sulfate-oxalate exchanger SAT-1 (SLC26A1) by glyoxylate: a metabolic link between liver and kidney?. J Hepatol 54(3):406-7 PMID: 21084130
