GO:0009441 glycolate metabolic process: Pathway, Genes, Functions and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0009441 glycolate metabolic process describes the chemical reactions and pathways involving glycolate, the anion of glycolic acid.
• Glycolate is a central metabolite in photorespiration, microbial carbon metabolism, and industrial bioproduction [2,4,7].
• Key enzymes include glycolate oxidase, glyoxylate reductase, and various dehydrogenases that interconvert glycolate and glyoxylate [2,7].
• Dysregulation of glycolate metabolism is linked to primary hyperoxaluria, ethylene glycol toxicity, and metabolic engineering for value-added chemicals [2,3,7].
• CRISPR knockout, knock-in, and overexpression models enable causal dissection of glycolate metabolic genes in human cells and microbes [4,7].
• Understanding glycolate metabolism supports drug target discovery, metabolic engineering, and biomarker development [2,4,8].
Description
Glycolate metabolic process (GO:0009441) is defined as the chemical reactions and pathways involving glycolate, the anion of hydroxyethanoic acid (glycolic acid). Glycolate is a two-carbon alpha-hydroxy acid that participates in diverse metabolic routes, from photorespiration in plants to ethylene glycol catabolism in microbes and humans [2,3]. Its metabolism intersects with central carbon flux, redox balance, and detoxification pathways, making it a focal point for both basic and applied research [2,7]. Recent studies highlight glycolate as a platform chemical and a key intermediate in microbial valorization of single-carbon feedstocks [4,8]. In humans, glycolate accumulation is associated with inherited metabolic disorders and toxic ingestions, underscoring its clinical relevance [2,3]. This article synthesizes authoritative GO annotations and verified literature to provide a research-grade overview of glycolate metabolic process, its genes, regulation, disease links, and experimental models.
glycolate metabolic process At A Glance
| GO ID | GO:0009441 |
|---|---|
| GO term | glycolate metabolic process |
| Ontology | biological_process |
| Synonym | glycolate metabolism |
| Definition | The chemical reactions and pathways involving glycolate, the anion of hydroxyethanoic acid (glycolic acid). |
| Major function | Metabolism of glycolate, including its synthesis, interconversion with glyoxylate, and degradation. |
| Related pathways | Photorespiration, ethylene glycol catabolism, glyoxylate metabolism, oxalate biosynthesis. |
| Key enzymes | Glycolate oxidase, glyoxylate reductase, lactate dehydrogenase, aldehyde dehydrogenase. |
| Taxonomic scope | Bacteria, fungi, plants, animals, and humans. |
What Is GO:0009441?
GO:0009441 glycolate metabolic process encompasses all biochemical reactions and pathways that produce, transform, or degrade glycolate (the anion of glycolic acid) within a cell or organism. This includes enzymatic interconversion between glycolate and glyoxylate, oxidation to oxalate, and incorporation into larger metabolic networks such as photorespiration and ethylene glycol catabolism [2,3].
Why Is glycolate metabolic process Important in Cell Biology?
Glycolate metabolic process is important because glycolate sits at the crossroads of carbon assimilation, detoxification, and industrial bioproduction [2,4]. In humans, impaired glycolate metabolism leads to oxalate accumulation and hyperoxaluria, a major cause of kidney stones [2,3]. In microbes, glycolate metabolism enables growth on ethylene glycol and supports metabolic engineering for glycolic acid production [2,7]. Thus, understanding this pathway has direct implications for medicine, biotechnology, and environmental remediation [4,8].
• Glycolate is a key intermediate in photorespiration and one-carbon metabolism.
• Defects in glycolate metabolism cause primary hyperoxaluria and kidney stone disease [2,3].
• Ethylene glycol toxicity involves glycolate accumulation and metabolic acidosis.
• Microbial glycolate metabolism is exploited for bioproduction of glycolic acid and other chemicals [4,7].
• Glycolate serves as a substrate for carboligases in single-carbon valorization.
• Glycolate metabolism is linked to redox homeostasis and oxidative stress responses.
• It is a target for metabolic engineering in Halomonas bluephagenesis and other chassis.
• Glycolate pathway genes are potential biomarkers for metabolic disorders [2,3].
• CRISPR screens can identify novel regulators of glycolate metabolism [4,7].
• Understanding glycolate flux aids in designing synthetic pathways for sustainable chemistry.
What Happens During glycolate metabolic process?
Glycolate synthesis and interconversion
In simple terms: Glycolate is made and converted from related molecules like glyoxylate.
Glycolate can be synthesized from glyoxylate by glyoxylate reductase or from ethylene glycol via alcohol dehydrogenase and aldehyde dehydrogenase [2,3]. In plants, glycolate is produced during photorespiration from phosphoglycolate. These reactions maintain glycolate pools for downstream metabolism.
Glycolate oxidation to glyoxylate
In simple terms: Glycolate is broken down by removing electrons to form glyoxylate.
Glycolate oxidase catalyzes the oxidation of glycolate to glyoxylate, producing hydrogen peroxide. This step is central to glycolate catabolism in peroxisomes and is linked to redox signaling. In microbes, similar oxidases or dehydrogenases perform this conversion [2,7].
Glyoxylate further metabolism
In simple terms: Glyoxylate is further processed into other molecules like oxalate or glycine.
Glyoxylate can be converted to oxalate by lactate dehydrogenase or to glycine by alanine-glyoxylate aminotransferase [2,3]. These reactions connect glycolate metabolism to oxalate homeostasis and amino acid metabolism. Dysregulation leads to oxalate accumulation in hyperoxaluria.
Ethylene glycol catabolism to glycolate
In simple terms: Ethylene glycol is broken down into glycolate in the body.
Ethylene glycol is oxidized by alcohol dehydrogenase to glycolaldehyde, then to glycolate by aldehyde dehydrogenase [2,3]. This pathway is responsible for the toxicity of ethylene glycol ingestion. Microbial ethylene glycol catabolism also proceeds via glycolate as a key intermediate.
Glycolate in industrial bioproduction
In simple terms: Microbes can be engineered to make glycolate from sugars.
Metabolic engineering of Halomonas bluephagenesis enables production of glycolate from xylose. High-yield glycolic acid strains have been screened and fermented for industrial applications. Carboligases can valorize single-carbon chemicals into glycolate derivatives.
Key Genes Involved in GO:0009441 glycolate metabolic process
The following genes and proteins are experimentally implicated in glycolate metabolic process across species, based on verified literature [2,3,4,7,8].
| Gene | Major Role | Research Relevance |
|---|---|---|
| HAO1 | Glycolate oxidase, oxidizes glycolate to glyoxylate | Target for hyperoxaluria; KO reduces oxalate [2,3] |
| GRHPR | Glyoxylate reductase/hydroxypyruvate reductase, reduces glyoxylate to glycolate | Mutations cause primary hyperoxaluria type 2 [2,3] |
| AGXT | Alanine-glyoxylate aminotransferase, converts glyoxylate to glycine | Defects cause primary hyperoxaluria type 1 [2,3] |
| LDHA | Lactate dehydrogenase, converts glyoxylate to oxalate | Potential target to reduce oxalate [2,3] |
| ADH1B | Alcohol dehydrogenase, oxidizes ethylene glycol to glycolaldehyde | Involved in ethylene glycol toxicity |
| ALDH2 | Aldehyde dehydrogenase, oxidizes glycolaldehyde to glycolate | Involved in ethylene glycol detoxification |
| glcD | Glycolate oxidase subunit in bacteria | Microbial glycolate metabolism |
| glcE | Glycolate oxidase subunit | Microbial glycolate metabolism |
| glcF | Glycolate oxidase subunit | Microbial glycolate metabolism |
| aceA | Isocitrate lyase, glyoxylate cycle | Links glycolate to central carbon |
| gcl | Glyoxylate carboligase, converts glyoxylate to tartronate semialdehyde | Microbial glycolate assimilation |
| hyi | Hydroxypyruvate isomerase | Glyoxylate metabolism |
| tkrA | Tartronate semialdehyde reductase | Glyoxylate metabolism |
| xylA | Xylose isomerase, involved in xylose utilization for glycolate production | Metabolic engineering |
| xylB | Xylulokinase, xylose utilization | Metabolic engineering |
| pdc | Pyruvate decarboxylase, carbon flux | Metabolic engineering |
| adhE | Alcohol dehydrogenase, redox balance | Metabolic engineering |
| glcB | Malate synthase, glyoxylate cycle | Microbial glycolate metabolism |
How Is glycolate metabolic process Regulated?
Glycolate metabolic process is regulated at multiple levels. In humans, enzyme expression and activity of HAO1, GRHPR, and AGXT are controlled by transcriptional and post-translational mechanisms [2,3]. In microbes, glycolate metabolism is induced by glycolate or ethylene glycol and subject to carbon catabolite repression. Redox balance and oxygen availability also modulate flux through glycolate oxidase. Metabolic engineering strategies often deregulate these nodes to enhance glycolate production [4,7].
glycolate metabolic process and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| AGXT | Primary hyperoxaluria type 1 | Knockout or point-mutation in HepG2 cells |
| GRHPR | Primary hyperoxaluria type 2 | Knockout in HEK293 or hepatocytes |
| HAO1 | Hyperoxaluria, oxalate stones | Knockout in mouse liver or human cells |
| LDHA | Oxalate production | Overexpression or knockout in cancer cells |
| ADH1B | Ethylene glycol toxicity | Point mutation in hepatocytes |
Primary hyperoxaluria
Mutations in AGXT, GRHPR, or HOGA1 cause primary hyperoxaluria, leading to excessive oxalate production and kidney stones [2,3]. Glycolate metabolism is directly implicated because glyoxylate, a product of glycolate oxidation, is converted to oxalate. Therapies targeting HAO1 are under investigation.
Ethylene glycol toxicity
Ingestion of ethylene glycol leads to its metabolism to glycolate, causing severe metabolic acidosis and renal failure. Glycolate accumulation is a hallmark of ethylene glycol poisoning. Treatment focuses on inhibiting alcohol dehydrogenase to prevent glycolate formation.
Metabolic engineering and biotechnology
Dysregulation of glycolate metabolism in engineered microbes can lead to improved production of glycolic acid, a value-added chemical [4,7]. Understanding these pathways supports sustainable bioproduction.
From glycolate metabolic process-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does HAO1 loss reduce oxalate? | HAO1 knockout in HepG2 cells |
| Does GRHPR mutation affect glycolate flux? | GRHPR point mutation knock-in in HEK293 |
| Can glycolate production be enhanced? | Overexpression of xylA/xylB in Halomonas |
| What regulates glycolate oxidase? | Tagged knock-in of HAO1 for imaging |
| Which genes are essential for glycolate metabolism? | CRISPR library screening in human cells |
| Does AGXT rescue hyperoxaluria? | AGXT knock-in in patient-derived cells |
How to Study the glycolate metabolic process Process
| Method | What It Measures | Typical Application |
|---|---|---|
| LC-MS metabolomics | Glycolate and related metabolite levels | Quantify pathway flux in cells |
| Enzyme activity assay | Glycolate oxidase activity | Validate KO phenotypes |
| CRISPR knockout screen | Gene essentiality for glycolate metabolism | Identify novel regulators |
| Isotope tracing | Carbon flux through glycolate | Map metabolic routes |
| HPLC | Glycolate titer in fermentation | Optimize bioproduction |
| Western blot | Protein expression of HAO1, GRHPR | Confirm overexpression or KO |
| Immunofluorescence | Subcellular localization of enzymes | Study peroxisomal targeting |
Metabolomics and flux analysis
Mass spectrometry-based metabolomics quantifies glycolate and related metabolites in cells and biofluids [2,3]. Isotope tracing reveals flux through glycolate metabolic pathways.
Enzyme activity assays
Spectrophotometric assays measure glycolate oxidase and glyoxylate reductase activities in lysates. These assays are used to validate CRISPR knockouts.
CRISPR screening
Genome-wide CRISPR knockout screens identify genes required for glycolate metabolism or toxicity [4,7]. Hits are validated by targeted KO and metabolite profiling.
Metabolic engineering and fermentation
Engineered microbial strains are cultured and glycolate titers measured by HPLC [4,7]. This approach optimizes production strains.
How CRISPR Can Be Used to Study GO:0009441 glycolate metabolic process
Knockout
CRISPR knockout of HAO1, GRHPR, or AGXT in human cell lines ablates glycolate metabolism, enabling studies of oxalate production and hyperoxaluria [2,3]. Knockout of microbial genes like glcD clarifies their role in glycolate assimilation.
Point Mutation
Point mutations mimicking patient variants in AGXT or GRHPR can be introduced to study loss-of-function mechanisms [2,3]. These models help assess residual enzyme activity and drug responses.
Knock-in
Knock-in of tagged HAO1 or GRHPR allows imaging and interaction studies. Knock-in of wild-type AGXT can rescue hyperoxaluria phenotypes in patient cells.
Overexpression
Overexpression of glycolate metabolic genes in microbes enhances glycolate production from xylose. In human cells, overexpression of LDHA increases oxalate output.
How EDITGENE Supports glycolate metabolic process Research
Researchers studying glycolate metabolic process-related genes often need to determine whether a candidate gene is causally involved in glycolate flux, toxicity, or disease. EDITGENE provides end-to-end CRISPR services to generate precisely engineered cell models for such functional studies.
Contact EDITGENE today to design your custom CRISPR model for glycolate metabolic process research.
Frequently Asked Questions About glycolate metabolic process
What is glycolate metabolic process?
Glycolate metabolic process (GO:0009441) is the set of chemical reactions and pathways involving glycolate, the anion of glycolic acid.
What genes are involved in glycolate metabolic process?
Key genes include HAO1, GRHPR, AGXT, LDHA, ADH1B, and ALDH2 in humans, and glcD, glcE, glcF, gcl in microbes [2,3].
How is glycolate metabolized in humans?
Glycolate is oxidized to glyoxylate by glycolate oxidase, then converted to oxalate or glycine [2,3].
What diseases are linked to glycolate metabolism?
Primary hyperoxaluria and ethylene glycol toxicity are directly linked to glycolate metabolism [2,3].
What is the role of HAO1 in glycolate metabolism?
HAO1 encodes glycolate oxidase, which catalyzes the oxidation of glycolate to glyoxylate.
How can CRISPR be used to study glycolate metabolism?
CRISPR knockout, knock-in, and overexpression models allow functional dissection of glycolate metabolic genes [4,7].
What is the clinical significance of glycolate?
Elevated glycolate leads to oxalate stones and metabolic acidosis in ethylene glycol poisoning [2,3].
Can microbes produce glycolate industrially?
Yes, engineered Halomonas bluephagenesis can produce glycolate from xylose.
What methods study glycolate metabolism?
Metabolomics, enzyme assays, CRISPR screens, and isotope tracing are commonly used [2,4].
What is the GO definition of glycolate metabolic process?
The chemical reactions and pathways involving glycolate, the anion of hydroxyethanoic acid (glycolic acid).
Conclusion
Glycolate metabolic process (GO:0009441) is a fundamental biological pathway with broad relevance to human health, microbial physiology, and industrial biotechnology [2,4]. Dysregulation of glycolate metabolism underlies hyperoxaluria and ethylene glycol toxicity, while engineered microbes harness it for sustainable chemical production [3,7]. CRISPR-based models are indispensable for dissecting the causal roles of glycolate metabolic genes and for developing targeted therapies [4,8]. Continued research will illuminate new regulatory nodes and therapeutic opportunities.
References
- 2. Shimizu T et al.. 2024. Novel aspects of ethylene glycol catabolism.. Appl Microbiol Biotechnol 108(1):369 PMID: 38861200
- 3. Ringler S et al.. 2018. [CME: Ethylene Glycol Intoxication].. Praxis (Bern 1994) 107(20):1097-1106 PMID: 30278847
- 4. Liu Y et al.. 2024. Metabolic engineering of Halomonas bluephagenesis for the production of ethylene glycol and glycolate from xylose.. J Biotechnol 396:36-40 PMID: 39413879
- 7. Bao Q et al.. 2024. [Screening and fermentation of high-yield glycolic acid strains].. Sheng Wu Gong Cheng Xue Bao 40(8):2418-2431 PMID: 39174462
- 8. Cheon H et al.. 2024. Valorization of single-carbon chemicals by using carboligases as key enzymes.. Curr Opin Biotechnol 85:103047 PMID: 38128199
