GO:0006751 glutathione catabolic process: Degradation Pathway, Genes, Functions and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0006751 glutathione catabolic process describes the biochemical breakdown of glutathione, the tripeptide glutamylcysteinylglycine, which serves as a coenzyme and antioxidant protecting protein sulfhydryl groups.
• Glutathione catabolism is essential for cysteine homeostasis, redox balance, and the detoxification of xenobiotics and reactive oxygen species.
• Key enzymes include gamma-glutamyltranspeptidase (GGT), dipeptidases, and glutathione S-transferases (GSTs), which conjugate glutathione to electrophiles for export.
• Dysregulated glutathione catabolism is implicated in cancer chemoresistance, cisplatin nephrotoxicity, neurodegeneration, and inflammatory coagulopathy.
• Cysteine S-glutathionylation, a reversible modification linked to catabolism, modulates protein function and signaling in disease.
• CRISPR knockout, knock-in, and overexpression models enable causal dissection of glutathione catabolic genes in human cells and organoids.
Description
Glutathione catabolic process (GO:0006751) is the set of chemical reactions and pathways that result in the breakdown of glutathione, a tripeptide composed of glutamylcysteinylglycine that acts as a coenzyme for some enzymes and as an antioxidant protecting sulfhydryl groups in enzymes and other proteins. This process is fundamental to cellular redox homeostasis, cysteine recycling, and the detoxification of reactive oxygen species and xenobiotics. Researchers study glutathione catabolism because its dysregulation contributes to cancer progression, chemoresistance, and tissue injury. The catabolic machinery includes gamma-glutamyltranspeptidase (GGT), which initiates extracellular glutathione degradation, and intracellular dipeptidases that release constituent amino acids. Glutathione S-transferases (GSTs) conjugate glutathione to electrophilic compounds, and the resulting S-conjugates are exported via ATP-dependent pumps, linking catabolism to detoxification. Additionally, cysteine S-glutathionylation, a post-translational modification, is dynamically influenced by glutathione levels and catabolic flux, affecting protein function in inflammation and sepsis. Understanding GO:0006751 is therefore critical for interpreting redox biology, drug metabolism, and disease mechanisms, and for designing targeted CRISPR models to probe gene function.
glutathione catabolic process At A Glance
| GO ID | GO:0006751 |
|---|---|
| GO term | glutathione catabolic process |
| Ontology | biological_process |
| Synonym | glutathione breakdown; glutathione catabolism; glutathione degradation |
| Major function | Breakdown of glutathione tripeptide for cysteine recycling, redox control, and detoxification |
| Key enzymes | Gamma-glutamyltranspeptidase (GGT), dipeptidases, glutathione S-transferases (GSTs) |
| Subcellular location | Cytosol, mitochondria, endoplasmic reticulum, and extracellular space |
| Related process | Glutathione S-conjugate export and cysteine S-glutathionylation |
What Is GO:0006751?
GO:0006751 glutathione catabolic process is defined as the chemical reactions and pathways resulting in the breakdown of glutathione, the tripeptide glutamylcysteinylglycine, which acts as a coenzyme for some enzymes and as an antioxidant in the protection of sulfhydryl groups in enzymes and other proteins. In practice, this includes enzymatic cleavage of the gamma-glutamyl bond, removal of glycine and cysteine residues, and conjugation reactions that facilitate glutathione turnover and detoxification.
Why Is glutathione catabolic process Important in Cell Biology?
Glutathione catabolic process is important because it governs the availability of cysteine, the rate-limiting substrate for glutathione synthesis, and regulates redox signaling, drug detoxification, and cellular protection against oxidative stress. Disruption of this process alters susceptibility to chemotherapy, inflammatory injury, and neurodegeneration, making it a focal point for therapeutic and diagnostic research.
• Maintains cysteine homeostasis and supports protein synthesis and redox balance.
• Enables detoxification of xenobiotics and electrophiles via glutathione S-conjugate formation and export.
• Modulates chemotherapy response, including cisplatin-induced nephrotoxicity.
• Contributes to inflammatory coagulopathy through S-glutathionylation of ANXA5 in sepsis.
• Influences hydroperoxide-reducing enzyme systems and free-radical regulation.
• Regulates protein function via reversible cysteine S-glutathionylation.
• Provides biomarkers for oxidative stress and antioxidant capacity in disease.
• Offers targets for CRISPR-based functional genomics in cancer and inflammation.
What Happens During glutathione catabolic process?
Initiation by Gamma-Glutamyltranspeptidase (GGT)
In simple terms: The first step cuts glutathione outside the cell or on membrane surfaces.
Gamma-glutamyltranspeptidase (GGT) hydrolyzes the gamma-glutamyl bond of glutathione, releasing glutamate and cysteinylglycine, which is the committed step in glutathione catabolism. This enzyme is membrane-bound and allows cells to recover cysteine for antioxidant defense and protein synthesis.
Dipeptide Cleavage and Amino Acid Recycling
In simple terms: The remaining dipeptide is split into single amino acids for reuse.
Cysteinylglycine is subsequently cleaved by dipeptidases to yield cysteine and glycine, completing the breakdown of glutathione and providing substrates for new glutathione synthesis or protein synthesis. This recycling is critical for maintaining intracellular cysteine pools under oxidative stress.
Conjugation and Export of Glutathione S-Conjugates
In simple terms: Glutathione attaches to harmful molecules and is pumped out of the cell.
Glutathione S-transferases (GSTs) catalyze the conjugation of glutathione to electrophilic compounds, forming S-conjugates that are exported by ATP-dependent pumps such as MRP/ABCC transporters. This pathway represents a major catabolic route for glutathione in detoxification and drug resistance.
Cysteine S-Glutathionylation and Redox Signaling
In simple terms: Glutathione can temporarily attach to proteins, changing their activity.
Cysteine S-glutathionylation is a reversible modification where glutathione binds to protein cysteines, often under oxidative conditions, and is linked to glutathione catabolic flux. This modification can alter enzyme activity and signaling, and its dysregulation is observed in inflammation and sepsis.
Regulation by Hydroperoxide-Reducing Systems
In simple terms: Enzymes that destroy peroxides influence how fast glutathione is used up.
Hydroperoxide-reducing enzymes such as glutathione peroxidases and peroxiredoxins consume glutathione as a reducing equivalent, indirectly promoting catabolic turnover and free-radical regulation. Their activity connects glutathione catabolism to oxidative stress responses.
Key Genes Involved in GO:0006751 glutathione catabolic process
The following genes and proteins are experimentally linked to glutathione catabolic process and its regulation.
| Gene | Major Role | Research Relevance |
|---|---|---|
| GGT1 | Initiates glutathione breakdown by cleaving gamma-glutamyl bond | Target for modulating cysteine availability and redox status |
| GGT5 | Gamma-glutamyltranspeptidase family member with tissue-specific expression | Potential role in leukotriene and glutathione metabolism |
| GGT7 | Gamma-glutamyltranspeptidase involved in glutathione homeostasis | Studied in cancer and oxidative stress |
| GSTP1 | Conjugates glutathione to electrophiles; S-glutathionylation | Chemotherapy resistance and detoxification |
| GSTM1 | Glutathione S-transferase for xenobiotic detoxification | Genetic polymorphism linked to cancer risk |
| GSTT1 | Glutathione S-transferase with catalytic diversity | Detoxification and susceptibility studies |
| GSTA1 | Glutathione S-transferase in drug metabolism | Model for substrate specificity |
| GSTO1 | S-glutathionylates ANXA5, promoting ubiquitination | Inflammation-associated coagulopathy in sepsis |
| ANXA5 | Substrate of GSTO1-mediated S-glutathionylation | Coagulation and inflammation research |
| GPX1 | Glutathione peroxidase consuming glutathione | Oxidative stress and free-radical regulation |
| GPX4 | Lipid hydroperoxide reduction using glutathione | Ferroptosis and neurodegeneration |
| PRDX1 | Peroxiredoxin reducing peroxides with glutathione | Redox signaling and cancer |
| ABCC1 | Exports glutathione S-conjugates | Multidrug resistance and detoxification |
| ABCC2 | ATP-dependent export pump for S-conjugates | Hepatic and renal detoxification |
| SLC7A11 | Cystine/glutamate antiporter supporting glutathione synthesis | Redox balance and ferroptosis |
| GCLC | Glutamate-cysteine ligase catalytic subunit for synthesis | Indirect regulator of catabolic flux |
| GCLM | Glutamate-cysteine ligase modifier subunit | Modulates glutathione levels and catabolism |
| GSS | Glutathione synthetase for de novo synthesis | Balance between synthesis and catabolism |
How Is glutathione catabolic process Regulated?
Glutathione catabolic process is regulated at multiple levels. Enzyme expression of GGT and GSTs is induced by oxidative stress and xenobiotics through Nrf2 and AhR signaling. Substrate availability, particularly cysteine and glutathione levels, controls flux through catabolic enzymes. Post-translational modifications such as S-glutathionylation can feedback on enzyme activity. In sepsis, GSTO1-mediated S-glutathionylation of ANXA5 enhances its ubiquitination, linking catabolism to inflammation and coagulopathy. Hydroperoxide-reducing enzymes also modulate catabolic demand by consuming glutathione.
glutathione catabolic process and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| GSTO1 | Sepsis-associated coagulopathy | Knockout macrophages and sepsis mouse models |
| GGT1 | Cisplatin nephrotoxicity | Renal tubular cell knockout and cisplatin challenge |
| GSTP1 | Cancer chemoresistance | Cancer cell line knockout and drug sensitivity assays |
| GPX4 | Ferroptosis and neurodegeneration | Neuronal overexpression and lipid peroxidation assays |
| ANXA5 | Thrombosis and inflammation | Point-mutation knock-in of S-glutathionylation site |
Cancer and Chemoresistance
Elevated glutathione catabolism and GST expression contribute to chemotherapy resistance by detoxifying drugs and modulating redox signaling. Cisplatin nephrotoxicity is linked to glutathione metabolism in renal cells, where catabolic enzymes influence drug clearance and injury. Targeting GGT and GSTs may sensitize tumors to therapy.
Sepsis and Inflammatory Coagulopathy
GSTO1 promotes macrophage inflammation-associated coagulopathy in sepsis by S-glutathionylating ANXA5, enhancing its ubiquitination. This connects glutathione catabolic process to immune dysregulation and thrombosis.
Neurodegeneration and Oxidative Stress
Impaired glutathione catabolism and cysteine recycling are implicated in neurodegenerative conditions where oxidative stress overwhelms antioxidant defenses. Hydroperoxide-reducing enzymes and glutathione peroxidase activity are critical for neuronal survival.
Metabolic and Redox Disorders
Dysregulated glutathione breakdown affects cysteine homeostasis and redox balance, contributing to metabolic dysfunction and tissue injury. Genetic variants in GSTs and GGT influence susceptibility to oxidative damage.
From glutathione catabolic process-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does GGT1 loss alter glutathione catabolism? | CRISPR knockout in HepG2 or renal cells |
| Does GSTO1 S-glutathionylation of ANXA5 drive coagulopathy? | Point-mutation knock-in of ANXA5 cysteine mutant |
| Can GSTP1 overexpression confer drug resistance? | Overexpression in cancer cell lines |
| How does GPX4 affect ferroptosis? | Knockout and lipid peroxidation measurement |
| Does SLC7A11 regulate cysteine availability for catabolism? | Knockout with cysteine tracing |
| Can tagged GGT1 reveal subcellular localization? | Knock-in of fluorescent tag |
How to Study the glutathione catabolic process Process
| Method | What It Measures | Typical Application |
|---|---|---|
| LC-MS metabolomics | Glutathione and catabolite levels | Quantifying catabolic flux |
| Enzymatic recycling assay | Total glutathione and GSSG | Redox status assessment |
| CRISPR knockout screening | Gene essentiality and drug sensitivity | Identifying catabolic regulators |
| S-Glutathionylation proteomics | Cysteine modification sites | Signaling and inflammation studies |
| Fluorescent redox sensors | Real-time redox changes | Live-cell imaging |
| qPCR and Western blot | Enzyme expression | Validating knockout or overexpression |
| Transport assays | S-conjugate export activity | MRP/ABCC function |
| Lipid peroxidation assay | Ferroptosis markers | GPX4 functional studies |
Metabolomics and Glutathione Quantification
Liquid chromatography-mass spectrometry (LC-MS) and enzymatic recycling assays measure glutathione and its catabolites, revealing flux through GO:0006751.
CRISPR Functional Genomics
Pooled CRISPR knockout screens targeting GGT, GST, and transporter genes identify modifiers of glutathione catabolism and drug response.
Proteomics and S-Glutathionylation Detection
Mass spectrometry-based proteomics and biotinylated glutathione probes detect S-glutathionylated proteins, linking catabolism to signaling.
Imaging and Reporter Assays
Genetically encoded redox sensors and fluorescent glutathione probes visualize catabolic activity in live cells and tissues.
How CRISPR Can Be Used to Study GO:0006751 glutathione catabolic process
Knockout
CRISPR knockout of GGT1, GSTP1, or GPX4 in human cell lines ablates glutathione catabolic enzymes, enabling measurement of glutathione accumulation, cysteine depletion, and drug sensitivity.
Point Mutation
Point mutation knock-in of catalytic residues or S-glutathionylation sites, such as ANXA5 cysteine mutants, dissects specific catabolic functions without altering protein levels.
Knock-in
Knock-in of fluorescent or affinity tags into GGT1 or GST genes allows live-cell tracking of enzyme localization and interaction with catabolic substrates.
Overexpression
Overexpression of GSTP1 or GGT1 in cancer cells models chemoresistance and increased detoxification capacity, providing gain-of-function evidence for catabolic pathways.
How EDITGENE Supports glutathione catabolic process Research
Researchers studying glutathione catabolic process-related genes often need to determine whether a candidate gene is causally involved in glutathione breakdown, redox regulation, or disease phenotypes. EDITGENE provides validated CRISPR models to test these hypotheses directly in relevant human cell backgrounds.
Contact EDITGENE today to design your custom CRISPR model for glutathione catabolic process research.
Related Products
| Product name | Cat.No. | Species | Gene ID | |
|---|---|---|---|---|
| GGT5 Knockout HEK293 Cell Line | EDJ-KQ3265 | Human | 2687 | Details Get a Quote |
| DPEP1 Knockout HEK293 Cell Line | EDJ-KQ4470 | Human | 1800 | Details Get a Quote |
| GGT7 Knockout HEK293 Cell Line | EDJ-KQ4705 | Human | 2686 | Details Get a Quote |
| GGT1 Knockout HEK293 Cell Line | EDJ-KQ4706 | Human | 2678 | Details Get a Quote |
| OPLAH Knockout HEK293 Cell Line | EDJ-KQ8618 | Human | 26873 | Details Get a Quote |
| GGTLC1 Knockout HEK293 Cell Line | EDJ-KQ10830 | Human | 92086 | Details Get a Quote |
| CHAC1 Knockout HEK293 Cell Line | EDJ-KQ12902 | Human | 79094 | Details Get a Quote |
| CHAC2 Knockout HEK293 Cell Line | EDJ-KQ12903 | Human | 494143 | Details Get a Quote |
| GGTLC3 Knockout HEK293 Cell Line | EDJ-KQ13589 | Human | 728226 | Details Get a Quote |
| GGT1 Knockout HCT 116 Cell Line | EDJ-KQ26184 | Human | 2678 | Details Get a Quote |
| DPEP1 Knockout A-549 Cell Line | EDJ-KQ27034 | Human | 1800 | Details Get a Quote |
| CHAC1 Knockout A-549 Cell Line | EDJ-KQ42084 | Human | 79094 | Details Get a Quote |
| CHAC1 Knockout HCT 116 Cell Line | EDJ-KQ42085 | Human | 79094 | Details Get a Quote |
| CHAC1 Knockout HeLa Cell Line | EDJ-KQ42086 | Human | 79094 | Details Get a Quote |
| CHAC2 Knockout A-549 Cell Line | EDJ-KQ42087 | Human | 494143 | Details Get a Quote |
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Frequently Asked Questions About glutathione catabolic process
What is glutathione catabolic process?
It is the biochemical breakdown of glutathione, a tripeptide antioxidant, into its constituent amino acids and conjugates, defined by GO:0006751.
What genes are involved in glutathione catabolic process?
Key genes include GGT1, GGT5, GGT7, GSTP1, GSTM1, GSTT1, GSTO1, GPX1, GPX4, and ABCC transporters.
What enzymes break down glutathione?
Gamma-glutamyltranspeptidase (GGT) initiates breakdown, dipeptidases cleave cysteinylglycine, and glutathione S-transferases conjugate glutathione for export.
Why is glutathione catabolism important in cancer?
It supports detoxification of chemotherapy drugs and redox balance, contributing to chemoresistance and tumor survival.
How is glutathione catabolic process measured?
LC-MS metabolomics, enzymatic recycling assays, and S-glutathionylation proteomics quantify catabolic flux and modifications.
What is the role of GSTO1 in sepsis?
GSTO1 S-glutathionylates ANXA5, enhancing its ubiquitination and promoting inflammation-associated coagulopathy in sepsis.
Can CRISPR knockout be used to study glutathione catabolism?
Yes, knockout of GGT1, GSTP1, or GPX4 in human cells reveals effects on glutathione levels, redox status, and drug sensitivity.
What is cysteine S-glutathionylation?
It is a reversible modification where glutathione binds protein cysteines, regulating function and signaling, linked to catabolic flux.
Which diseases are linked to glutathione catabolic process?
Cancer chemoresistance, cisplatin nephrotoxicity, sepsis coagulopathy, and neurodegeneration are associated with dysregulated glutathione catabolism.
How does glutathione catabolism affect redox balance?
It recycles cysteine and removes oxidized glutathione, maintaining reducing equivalents and protecting sulfhydryl groups.
Conclusion
Glutathione catabolic process (GO:0006751) is a central metabolic pathway that controls cysteine recycling, redox homeostasis, and detoxification. Its dysregulation is implicated in cancer, sepsis, and neurodegeneration, making it a high-value target for CRISPR functional studies. EDITGENE offers comprehensive knockout, point mutation, knock-in, overexpression, and screening services to accelerate mechanistic and translational research on glutathione catabolism.
References
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- 2. Zhang J et al.. 2021. Cisplatin chemotherapy and renal function.. Adv Cancer Res 152:305-327 PMID: 34353441
- 3. Oestreicher J et al.. 2019. Glutathione: subcellular distribution and membrane transport (1).. Biochem Cell Biol 97(3):270-289 PMID: 30427707
- 4. Keppler D. 1999. Export pumps for glutathione S-conjugates.. Free Radic Biol Med 27(9-10):985-91 PMID: 10569630
- 5. Peng J et al.. 2026. Glutathione S-Transferase Omega 1 Promotes Macrophage Inflammation-Associated Coagulopathy in Sepsis by S-Glutathionylating ANXA5 to Enhance Its Ubiquitination.. FASEB J 40(17):e72243 PMID: 42663978
- 6. Benöhr HC et al.. 1975. [Glutathione (author's transl)].. Klin Wochenschr 53(17):789-802 PMID: 543
- 7. Sharapov MG et al.. 2021. Hydroperoxide-Reducing Enzymes in the Regulation of Free-Radical Processes.. Biochemistry (Mosc) 86(10):1256-1274 PMID: 34903155
- 8. Grek CL et al.. 2013. Causes and consequences of cysteine S-glutathionylation.. J Biol Chem 288(37):26497-504 PMID: 23861399
