GO:0018738 S-formylglutathione hydrolase activity: Mechanism, Genes and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0018738 defines the molecular function S-formylglutathione hydrolase activity, catalyzing the hydrolysis of S-formylglutathione to formate, glutathione, and H+.
• The enzyme is a serine hydrolase belonging to the esterase D family, conserved from bacteria to humans.
• It plays a central role in formaldehyde detoxification and one-carbon metabolism.
• In humans, the enzyme is encoded by ESD (esterase D), which also functions as a tumor suppressor.
• Klotho regulates S-formylglutathione hydrolase expression, linking it to aging and oxidative stress.
• Structural studies have revealed substrate specificity and catalytic mechanisms across species.
Description
S-formylglutathione hydrolase activity (GO:0018738) is a molecular function that catalyzes the hydrolysis of S-formylglutathione into formate, glutathione, and a proton. This enzymatic activity is essential for the detoxification of formaldehyde, a highly reactive and toxic metabolite, and for the recycling of glutathione, a major cellular antioxidant. The enzyme is widely conserved across prokaryotes, plants, and mammals, underscoring its fundamental biological importance. In humans, the enzyme is encoded by the esterase D (ESD) gene, which has been implicated in cancer suppression and aging-related processes. Understanding this activity is crucial for researchers studying formaldehyde metabolism, oxidative stress, and related diseases. The enzyme's ability to hydrolyze S-formylglutathione also connects it to one-carbon metabolism and cellular redox balance. Given its broad relevance, S-formylglutathione hydrolase serves as a model for studying enzyme evolution, substrate specificity, and metabolic detoxification pathways.
S-formylglutathione hydrolase activity At A Glance
| GO ID | GO:0018738 |
|---|---|
| GO term | S-formylglutathione hydrolase activity |
| Ontology | molecular_function |
| Synonym | None |
| Major function | Catalyzes the hydrolysis of S-formylglutathione to formate, glutathione, and H+ |
| EC number | 3.1.2.12 |
| Reaction | S-formylglutathione + H2O = formate + glutathione + H+ |
| Pathway | Formaldehyde detoxification; glutathione recycling |
| Cellular location | Cytoplasm (inferred from homologs) |
What Is GO:0018738?
S-formylglutathione hydrolase activity (GO:0018738) is defined as the catalysis of the reaction: S-formylglutathione + H2O = formate + glutathione + H+. This activity removes the formyl group from S-formylglutathione, producing formate and free glutathione, which can then participate in further metabolic reactions or antioxidant defense.
Why Is S-formylglutathione hydrolase activity Important in Cell Biology?
S-formylglutathione hydrolase activity is critical for cellular protection against formaldehyde toxicity and for maintaining glutathione homeostasis. Formaldehyde is a ubiquitous environmental pollutant and a byproduct of cellular metabolism, and its accumulation can lead to protein and DNA damage. By catalyzing the hydrolysis of S-formylglutathione, this enzyme ensures the efficient detoxification of formaldehyde and the regeneration of reduced glutathione, a key antioxidant. In humans, the enzyme is encoded by ESD, which has been linked to tumor suppression and aging through regulation by klotho. Moreover, structural and functional studies of bacterial and plant homologs have provided insights into enzyme evolution and cold adaptation. Thus, understanding this activity has broad implications for biotechnology, medicine, and environmental science.
• Detoxifies formaldehyde, a toxic metabolite and environmental pollutant.
• Recycles glutathione, supporting cellular antioxidant defense.
• Linked to one-carbon metabolism and methyl group transfer.
• Human ESD (esterase D) acts as a tumor suppressor.
• Regulated by the anti-aging protein klotho.
• Conserved across bacteria, plants, and animals.
• Potential target for anti-aging and cancer therapies.
• Involved in methanol dissimilation in yeast.
• Structural studies inform enzyme engineering and drug design.
• Provides a model for studying serine hydrolase mechanisms.
What Happens During S-formylglutathione hydrolase activity?
Substrate Binding and Recognition
In simple terms: The enzyme grabs S-formylglutathione and positions it for cleavage.
S-formylglutathione hydrolase binds its substrate, S-formylglutathione, through a conserved active site that includes a serine nucleophile and an oxyanion hole. Structural studies of bacterial homologs have revealed that the substrate's glutathione moiety is recognized by specific residues, ensuring high specificity. The enzyme from Arabidopsis thaliana also exhibits strict specificity for S-formylglutathione.
Catalytic Hydrolysis
In simple terms: Water is used to split the molecule into formate and glutathione.
The catalytic mechanism involves nucleophilic attack by the active-site serine on the formyl carbon, forming an acyl-enzyme intermediate, followed by hydrolysis to release formate and regenerate the free enzyme. This reaction produces formate, glutathione, and a proton. The enzyme from human liver has been purified and characterized, confirming this mechanism.
Product Release and Glutathione Recycling
In simple terms: The products are released, and glutathione becomes available again.
After hydrolysis, formate and glutathione are released from the active site. Glutathione can then participate in other reactions, such as formaldehyde detoxification or antioxidant defense. In Paracoccus denitrificans, the enzyme is part of a pathway that detoxifies formaldehyde by converting it to formate via S-formylglutathione.
Role in Formaldehyde Detoxification Pathway
In simple terms: This enzyme is a key step in converting toxic formaldehyde into harmless formate.
In the formaldehyde detoxification pathway, formaldehyde reacts with glutathione to form S-hydroxymethylglutathione, which is then oxidized to S-formylglutathione by a dehydrogenase. S-formylglutathione hydrolase then hydrolyzes S-formylglutathione to formate and glutathione. This pathway is conserved from bacteria to humans. In the yeast Candida boidinii, the enzyme is involved in methanol dissimilation, where methanol is converted to formaldehyde and then to formate.
Key Genes Involved in GO:0018738 S-formylglutathione hydrolase activity
The following genes and proteins are directly associated with S-formylglutathione hydrolase activity or its substrate and pathway.
| Gene | Major Role | Research Relevance |
|---|---|---|
| ESD (human) | Encodes S-formylglutathione hydrolase; also known as esterase D | Tumor suppressor, aging, formaldehyde detoxification |
| frmB (E. coli) | S-formylglutathione hydrolase | Bacterial formaldehyde detoxification |
| AtSFGH (Arabidopsis thaliana) | S-formylglutathione hydrolase | Plant formaldehyde detoxification and stress response |
| SfSFGH (Shewanella frigidimarina) | Cold-active S-formylglutathione hydrolase | Psychrophilic enzyme adaptation |
| Variovorax sp. PAMC 28711 SFGH | S-formylglutathione hydrolase | Structural basis for substrate specificity |
| Agrobacterium tumefaciens SFGH | Putative S-formylglutathione hydrolase | Structural genomics |
| Candida boidinii SFGH | S-formylglutathione hydrolase | Methanol dissimilation |
| Paracoccus denitrificans SFGH | S-formylglutathione hydrolase | Homology to human esterase D |
| Klotho | Regulates ESD expression | Anti-aging, oxidative stress |
| GSH (glutathione) | Substrate/product | Redox balance |
| Formaldehyde dehydrogenase | Produces S-formylglutathione | Formaldehyde detoxification |
| S-hydroxymethylglutathione dehydrogenase | Oxidizes S-hydroxymethylglutathione | Formaldehyde detoxification |
| Methanol dehydrogenase | Oxidizes methanol to formaldehyde | Methanol metabolism |
| Formate dehydrogenase | Oxidizes formate to CO2 | One-carbon metabolism |
| Esterase D (plant) | Homolog of human ESD | Plant detoxification |
| ESD (mouse) | S-formylglutathione hydrolase | Model for human ESD |
| ESD (rat) | S-formylglutathione hydrolase | Liver enzyme studies |
How Is S-formylglutathione hydrolase activity Regulated?
S-formylglutathione hydrolase activity is regulated at multiple levels. In humans, the anti-aging gene klotho has been shown to regulate the expression of ESD, the gene encoding S-formylglutathione hydrolase, thereby influencing formaldehyde detoxification and oxidative stress responses. Additionally, the enzyme's activity may be modulated by substrate availability and cellular redox status, as glutathione levels affect the formation of S-formylglutathione. In bacteria, the expression of frmB is induced by formaldehyde, ensuring timely detoxification. In plants, AtSFGH expression is upregulated under stress conditions, suggesting transcriptional regulation.
S-formylglutathione hydrolase activity and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| ESD | Cancer (retinoblastoma, leukemia) | ESD knockout cancer cell lines |
| ESD | Aging and oxidative stress | Klotho knockout mouse models |
| frmB | Formaldehyde toxicity | E. coli frmB deletion strains |
| AtSFGH | Plant stress response | Arabidopsis sfgh mutants |
| ESD | Methanol poisoning | Human hepatocyte models |
Cancer and Tumor Suppression
The human ESD gene, encoding S-formylglutathione hydrolase, is located on chromosome 13q14, a region frequently deleted in retinoblastoma and other cancers. ESD has been proposed as a tumor suppressor, and its loss may contribute to cancer progression. Additionally, klotho-mediated regulation of ESD suggests a link between aging and cancer.
Aging and Oxidative Stress
Klotho, an anti-aging protein, regulates ESD expression, and reduced klotho levels are associated with aging and age-related diseases. S-formylglutathione hydrolase helps maintain glutathione levels, protecting cells from oxidative damage.
Formaldehyde Toxicity and Metabolic Disorders
Deficiencies in formaldehyde detoxification pathways, including S-formylglutathione hydrolase, can lead to formaldehyde accumulation, which is toxic and carcinogenic. This is relevant in methanol poisoning and inborn errors of metabolism.
Neurodegeneration
Formaldehyde has been implicated in neurodegeneration, and impaired detoxification may contribute to Alzheimer's and Parkinson's diseases. However, direct evidence linking S-formylglutathione hydrolase to neurodegeneration is limited.
From S-formylglutathione hydrolase activity-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| What is the effect of ESD loss on cell proliferation? | ESD knockout cancer cell lines (e.g., HeLa, HEK293) |
| How does klotho regulate ESD expression? | Klotho overexpression and knockdown in mammalian cells |
| What is the role of ESD in formaldehyde detoxification? | ESD knockout mouse embryonic fibroblasts |
| How does a point mutation affect catalytic activity? | Site-directed mutagenesis of ESD (e.g., S149A) |
| Can ESD be used as a reporter for glutathione levels? | Knock-in of fluorescent tag into ESD locus |
| What is the impact of ESD overexpression on oxidative stress? | ESD overexpression in neuronal cell lines |
How to Study the S-formylglutathione hydrolase activity Process
| Method | What It Measures | Typical Application |
|---|---|---|
| Enzymatic assay | S-formylglutathione hydrolase activity | Kinetic studies, inhibitor screening |
| X-ray crystallography | Three-dimensional structure | Active site analysis, drug design |
| RNA-seq | Transcript levels of ESD and related genes | Expression profiling under stress |
| Western blot | Protein expression | Validation of knockout or overexpression |
| CRISPR-Cas9 knockout | Loss-of-function phenotype | Cancer cell proliferation studies |
| Site-directed mutagenesis | Effect of point mutations on activity | Catalytic mechanism elucidation |
| Glutathione assay | Cellular glutathione levels | Oxidative stress measurement |
| Formaldehyde detection | Formaldehyde concentration | Detoxification capacity |
Enzymatic Activity Assays
S-formylglutathione hydrolase activity can be measured spectrophotometrically by monitoring the formation of formate or glutathione. Purified enzyme or cell lysates are incubated with S-formylglutathione, and the reaction is followed by coupling to formate dehydrogenase or by using Ellman's reagent for glutathione detection.
Structural Biology
X-ray crystallography and cryo-EM have been used to determine the structures of S-formylglutathione hydrolases from various species, revealing the active site architecture and substrate binding. These studies inform inhibitor design and enzyme engineering.
Gene Expression Analysis
Quantitative RT-PCR and RNA-seq can measure ESD mRNA levels in response to stimuli such as klotho or formaldehyde. Western blotting detects protein levels.
CRISPR-Cas9 Genome Editing
Knockout, knock-in, and point mutations can be generated using CRISPR-Cas9 to study the function of ESD in cells and animal models. This allows for precise interrogation of the enzyme's role in detoxification and disease.
How CRISPR Can Be Used to Study GO:0018738 S-formylglutathione hydrolase activity
Knockout
CRISPR-Cas9 knockout of ESD can be used to create cell lines or animal models lacking S-formylglutathione hydrolase activity. These models are valuable for studying the enzyme's role in formaldehyde detoxification, glutathione homeostasis, and tumor suppression.
Point Mutation
Point mutations in the catalytic serine (e.g., S149A) can be introduced using CRISPR-Cas9 to abolish enzymatic activity while preserving protein structure. This helps distinguish catalytic function from other roles of ESD.
Knock-in
Knock-in of epitope tags (e.g., FLAG, GFP) into the endogenous ESD locus allows for real-time imaging and immunoprecipitation of the enzyme, facilitating studies of its localization and interactions.
Overexpression
CRISPR activation (CRISPRa) or lentiviral overexpression of ESD can be used to study the effects of increased enzyme activity on cellular resistance to formaldehyde and oxidative stress.
How EDITGENE Supports S-formylglutathione hydrolase activity Research
Researchers studying S-formylglutathione hydrolase activity-related genes often need to determine whether a candidate gene is causally involved in detoxification, cancer, or aging. 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 S-formylglutathione hydrolase activity research.
Frequently Asked Questions About S-formylglutathione hydrolase activity
What is S-formylglutathione hydrolase activity?
It is a molecular function (GO:0018738) that catalyzes the hydrolysis of S-formylglutathione to formate, glutathione, and H+.
What genes are involved in S-formylglutathione hydrolase activity?
The human gene is ESD (esterase D). Bacterial homologs include frmB in E. coli and SFGH in Paracoccus denitrificans. Plant homologs include AtSFGH in Arabidopsis.
What is the role of S-formylglutathione hydrolase in formaldehyde detoxification?
It catalyzes the final step in the glutathione-dependent formaldehyde detoxification pathway, converting S-formylglutathione to formate and glutathione.
How is S-formylglutathione hydrolase regulated?
In humans, it is regulated by the anti-aging gene klotho. In bacteria, expression is induced by formaldehyde.
What diseases are associated with S-formylglutathione hydrolase?
ESD has been linked to cancer (tumor suppressor) and aging. Deficiencies in formaldehyde detoxification can cause toxicity.
What is the structure of S-formylglutathione hydrolase?
It is a serine hydrolase with an alpha/beta hydrolase fold. Crystal structures are available for bacterial and plant homologs.
How can I study S-formylglutathione hydrolase activity?
Use enzymatic assays with S-formylglutathione, CRISPR knockout models, and structural biology. EDITGENE offers custom services.
Is S-formylglutathione hydrolase the same as esterase D?
Yes, in humans, esterase D (ESD) is the enzyme with S-formylglutathione hydrolase activity.
What is the reaction catalyzed by S-formylglutathione hydrolase?
S-formylglutathione + H2O = formate + glutathione + H+.
Why is S-formylglutathione hydrolase important for aging?
It is regulated by klotho and helps maintain glutathione levels, protecting against oxidative stress.
Conclusion
S-formylglutathione hydrolase activity (GO:0018738) is a conserved enzymatic function essential for formaldehyde detoxification and glutathione recycling. Its human counterpart, ESD, is implicated in cancer suppression and aging, making it a compelling target for biomedical research. Structural and mechanistic studies across species have provided a solid foundation for understanding its role in health and disease. With advanced CRISPR tools and EDITGENE's services, researchers can now dissect the precise functions of this enzyme in various biological contexts.
References
- 1. Hwang J et al.. 2022. Structural basis for the substrate specificity of an S-formylglutathione hydrolase derived from Variovorax sp. PAMC 28711.. Biochem Biophys Res Commun 629:159-164 PMID: 36122453
- 2. Kordic S et al.. 2002. Cloning and characterization of an S-formylglutathione hydrolase from Arabidopsis thaliana.. Arch Biochem Biophys 399(2):232-8 PMID: 11888210
- 3. Xu Y et al.. 2017. Regulation of S-formylglutathione hydrolase by the anti-aging gene klotho.. Oncotarget 8(51):88259-88275 PMID: 29179433
- 4. Neben I et al.. 1980. Studies on an enzyme, S-formylglutathione hydrolase, of the dissimilatory pathway of methanol in Candida boidinii.. Biochim Biophys Acta 614(1):81-91 PMID: 7397203
- 5. Lee CW et al.. 2019. Structural and functional characterization of a novel cold-active S-formylglutathione hydrolase (SfSFGH) homolog from Shewanella frigidimarina, a psychrophilic bacterium.. Microb Cell Fact 18(1):140 PMID: 31426813
- 6. Harms N et al.. 1996. S-formylglutathione hydrolase of Paracoccus denitrificans is homologous to human esterase D: a universal pathway for formaldehyde detoxification?. J Bacteriol 178(21):6296-9 PMID: 8892832
- 7. Uotila L et al.. 1974. Purification and properties of S-formylglutathione hydrolase from human liver.. J Biol Chem 249(23):7664-72 PMID: 4436331
- 8. van Straaten KE et al.. 2009. The structure of a putative S-formylglutathione hydrolase from Agrobacterium tumefaciens.. Protein Sci 18(10):2196-202 PMID: 19653299
