GO:0006790 sulfur compound metabolic process: Pathway, Genes, Functions and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0006790 sulfur compound metabolic process describes all chemical reactions and pathways involving elemental sulfur or sulfur-containing compounds, including the amino acids methionine and cysteine and the tripeptide glutathione.
• The transsulfuration pathway is a central route that interconverts homocysteine, cystathionine, cysteine, and glutathione, and is regulated by enzymes such as CBS, CTH, and MTR.
• Sulfur-containing amino acids influence lipid metabolism and oxidative balance, linking sulfur metabolism to metabolic and cardiovascular research.
• Reactive sulfur species (RSS) such as hydrogen sulfide (H2S) and persulfides are signaling molecules that chemically modify cysteine residues and regulate protein function.
• Microorganisms drive global sulfur cycling through methanethiol metabolism, phototrophic sulfur oxidation, and sulfide oxidation coupled to iron oxide respiration [1,5,7].
• CRISPR-based knockout, point-mutation, knock-in, and overexpression models enable causal dissection of sulfur metabolic genes in human cells and microbes [2,3].
Description
Sulfur compound metabolic process (GO:0006790) is a broad biological process ontology term that encompasses the chemical reactions and pathways involving the nonmetallic element sulfur or compounds that contain sulfur, such as the amino acids methionine and cysteine or the tripeptide glutathione. This term captures a wide range of transformations, from the assimilation of inorganic sulfate into organic sulfur compounds to the catabolism of sulfur-containing amino acids and the production of reactive sulfur species [3,8]. Because sulfur is essential for protein structure, redox homeostasis, and cellular signaling, defects in sulfur metabolism are implicated in diverse human diseases and in microbial ecology [3,6].
sulfur compound metabolic process At A Glance
| GO ID | GO:0006790 |
|---|---|
| GO term | sulfur compound metabolic process |
| Ontology | biological_process |
| Synonym | sulfur metabolism; sulphur metabolic process; sulphur metabolism |
| Major function | Metabolism of sulfur-containing compounds including methionine, cysteine, and glutathione |
| Definition | The chemical reactions and pathways involving the nonmetallic element sulfur or compounds that contain sulfur, such as the amino acids methionine and cysteine or the tripeptide glutathione. |
| Related pathways | Transsulfuration, methionine cycle, glutathione synthesis, reactive sulfur species production |
| Key enzymes | CBS, CTH, MTR, MTRR, GCLC, GCLM, MPST, SQOR |
| Research relevance | Human disease, redox biology, microbial sulfur cycling, metabolic engineering |
What Is GO:0006790?
In your own words, GO:0006790 sulfur compound metabolic process refers to the collection of biochemical reactions and pathways that build, modify, or break down molecules containing sulfur. This includes the synthesis and interconversion of sulfur-containing amino acids like methionine and cysteine, the production and utilization of glutathione, and the generation of reactive sulfur species such as hydrogen sulfide. The term is defined by the Gene Ontology as the chemical reactions and pathways involving the nonmetallic element sulfur or compounds that contain sulfur, such as the amino acids methionine and cysteine or the tripeptide glutathione.
Why Is sulfur compound metabolic process Important in Cell Biology?
Sulfur compound metabolic process is fundamentally important because sulfur is a key element in amino acids, cofactors, and redox-active molecules that control protein function and cellular defense. The transsulfuration pathway, a core component of this process, regulates homocysteine levels and produces cysteine, the rate-limiting precursor for glutathione synthesis. Dysregulation of sulfur metabolism is associated with cardiovascular disease, neurodegeneration, and cancer, while microbial sulfur transformations drive global biogeochemical cycles [1,3,5,7].
• Provides cysteine for glutathione synthesis, a major cellular antioxidant.
• Regulates homocysteine, a risk factor for cardiovascular and neurological disorders.
• Generates hydrogen sulfide and other reactive sulfur species that act as signaling molecules.
• Supports methionine salvage and one-carbon metabolism.
• Influences lipid metabolism through sulfur-containing amino acids.
• Drives microbial sulfur cycling, including methanethiol and sulfide oxidation [1,5,7].
• Enables biodesulfurization for industrial fuel processing.
• Links oxidative post-translational modifications to epigenetic regulation.
• Provides targets for metabolic engineering and drug discovery [2,3].
• Essential for protein structure and function across all domains of life.
What Happens During sulfur compound metabolic process?
Transsulfuration pathway
In simple terms: This is the route that converts one sulfur-containing amino acid into another, helping the cell make cysteine and control homocysteine.
The transsulfuration pathway interconverts homocysteine and cysteine via cystathionine. Cystathionine beta-synthase (CBS) condenses homocysteine with serine to form cystathionine, which is then cleaved by cystathionine gamma-lyase (CTH) to release cysteine and alpha-ketobutyrate. This pathway is a major source of cysteine for glutathione synthesis and is regulated by oxidative stress and nutrient status.
Methionine cycle and sulfur amino acid metabolism
In simple terms: Methionine is recycled and used to make other sulfur compounds through a series of linked reactions.
Methionine is converted to S-adenosylmethionine (SAM), the primary methyl donor, and then to S-adenosylhomocysteine (SAH), which is hydrolyzed to homocysteine. Homocysteine can be remethylated to methionine by methionine synthase (MTR) or betaine-homocysteine methyltransferase (BHMT), or enter the transsulfuration pathway. Sulfur-containing amino acids also influence lipid metabolism and oxidative balance.
Glutathione synthesis and redox control
In simple terms: Glutathione is a sulfur-containing antioxidant built from cysteine, and it protects cells from damage.
Glutathione (GSH) is synthesized from glutamate, cysteine, and glycine by glutamate-cysteine ligase (GCLC/GCLM) and glutathione synthetase (GSS). Cysteine availability is rate-limiting, linking glutathione synthesis to the transsulfuration pathway. GSH maintains redox homeostasis and is involved in detoxification and oxidative post-translational modifications [3,4].
Reactive sulfur species (RSS) production
In simple terms: Cells produce small sulfur-containing molecules like hydrogen sulfide that can modify proteins and act as signals.
Reactive sulfur species include hydrogen sulfide (H2S), persulfides, and polysulfides. Enzymes such as CBS, CTH, and 3-mercaptopyruvate sulfurtransferase (MPST) generate H2S. These species can modify cysteine residues via persulfidation, affecting protein activity and signaling. The chemical biology of RSS is an active area of research.
Microbial sulfur cycling
In simple terms: Microbes transform sulfur compounds in the environment, affecting global cycles.
Microorganisms carry out sulfur transformations including methanethiol cycling, sulfide oxidation, and phototrophic sulfur metabolism. Methanethiol is a key intermediate in the global sulfur cycle. Phototrophic sulfur bacteria oxidize sulfide to sulfate, and recent work shows microbial iron oxide respiration coupled to sulfide oxidation. Biodesulfurization by Gram-negative bacteria removes sulfur from fossil fuels.
Key Genes Involved in GO:0006790 sulfur compound metabolic process
The following genes encode enzymes and proteins directly involved in sulfur compound metabolic process, as supported by the cited literature.
| Gene | Major Role | Research Relevance |
|---|---|---|
| CBS | Condenses homocysteine and serine to cystathionine | Homocystinuria, cardiovascular disease, H2S production |
| CTH | Cleaves cystathionine to cysteine and alpha-ketobutyrate | Cysteine supply, glutathione synthesis, H2S production |
| MTR | Remethylates homocysteine to methionine | Methionine cycle, one-carbon metabolism |
| MTRR | Regenerates MTR activity | Methionine synthase regulation |
| BHMT | Remethylates homocysteine using betaine | Alternative homocysteine remethylation |
| GCLC | Catalyzes first step of glutathione synthesis | Glutathione homeostasis, oxidative stress |
| GCLM | Modulates GCLC activity | Glutathione synthesis regulation |
| GSS | Catalyzes second step of glutathione synthesis | Glutathione production |
| MPST | Produces H2S from 3-mercaptopyruvate | Reactive sulfur species signaling |
| SQOR | Oxidizes sulfide to thiosulfate | Sulfide detoxification, mitochondrial function |
| TST | Transfers sulfur from thiosulfate to cyanide | Cyanide detoxification, sulfur metabolism |
| SUOX | Oxidizes sulfite to sulfate | Sulfite oxidase deficiency |
| PAPSS1 | Activates sulfate for sulfation | Sulfate assimilation |
| PAPSS2 | Activates sulfate for sulfation | Sulfate assimilation |
| SLC26A1 | Sulfate transporter | Sulfate uptake |
| SLC26A2 | Sulfate transporter | Sulfate uptake |
| MST | Methanethiol metabolism in microbes | Microbial sulfur cycling |
How Is sulfur compound metabolic process Regulated?
Sulfur compound metabolic process is regulated at multiple levels. The transsulfuration pathway is controlled by the availability of homocysteine, oxidative stress, and transcriptional regulation of CBS and CTH. Methionine synthase (MTR) activity depends on vitamin B12 and folate status. Glutathione synthesis is feedback-inhibited by GSH and regulated by Nrf2-mediated transcription. Reactive sulfur species production is influenced by cellular redox state and enzyme expression. In bacteria, sulfur metabolism is regulated by sulfur availability and environmental conditions [1,7].
sulfur compound metabolic process and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| CBS | Homocystinuria, cardiovascular disease | Knockout or point-mutation in human cell lines |
| CTH | Cysteine deficiency, oxidative stress | Knockout in hepatocytes or neurons |
| MTR | Methylmalonic aciduria, homocystinuria | Knock-in of patient mutations |
| GCLC | Glutathione deficiency, oxidative stress | Knockout in cancer cell lines |
| MPST | Neurodegeneration, H2S signaling | Overexpression or knockout in neuronal cells |
Cardiovascular and metabolic disease
Elevated homocysteine, a sulfur-containing amino acid, is a risk factor for cardiovascular disease. The transsulfuration pathway regulates homocysteine levels, and its dysfunction is linked to endothelial dysfunction and thrombosis. Sulfur-containing amino acids also influence lipid metabolism, connecting sulfur metabolism to metabolic syndrome.
Neurodegeneration
Sulfur metabolism is implicated in neurodegenerative disorders. Hydrogen sulfide and other reactive sulfur species modulate neuronal signaling and oxidative stress. Dysregulation of the transsulfuration pathway has been observed in Alzheimer's and Parkinson's disease models.
Cancer
Cancer cells often reprogram sulfur metabolism to support proliferation and redox balance. Increased glutathione synthesis and altered transsulfuration flux are common in tumors. Reactive sulfur species can also modify histones and affect epigenetic regulation.
Microbial infections and biotechnology
Microbial sulfur metabolism is important for pathogen survival and for industrial applications. Biodesulfurization uses bacteria to remove sulfur from fuels, reducing environmental pollution. Methanethiol cycling affects global sulfur emissions.
From sulfur compound metabolic process-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does loss of CBS affect homocysteine levels? | CBS knockout cell line |
| Does a specific CTH mutation alter cysteine production? | CTH point-mutation knock-in |
| Can we tag endogenous MTR for localization? | MTR knock-in with fluorescent tag |
| Does overexpression of GCLC increase glutathione? | GCLC overexpression stable pool |
| Which genes regulate sulfur metabolism in cancer? | CRISPR library screening |
| How does sulfide oxidation affect microbial growth? | Microbial knockout of SQOR homologs |
How to Study the sulfur compound metabolic process Process
| Method | What It Measures | Typical Application |
|---|---|---|
| LC-MS metabolomics | Levels of sulfur metabolites | Quantify cysteine, glutathione, homocysteine |
| Stable isotope tracing | Flux through sulfur pathways | Measure transsulfuration flux |
| RNA-seq | Gene expression changes | Identify regulated sulfur genes |
| Proteomics | Protein abundance and modifications | Detect persulfidation |
| Enzyme activity assay | Catalytic activity of CBS, CTH | Validate knockout effects |
| H2S detection | Reactive sulfur species production | Measure H2S release |
| Microbial growth assay | Sulfur utilization | Test biodesulfurization |
Metabolomics and flux analysis
Mass spectrometry-based metabolomics quantifies sulfur-containing metabolites such as cysteine, homocysteine, glutathione, and H2S. Stable isotope tracing can measure flux through the transsulfuration pathway.
Transcriptomics and proteomics
RNA-seq and proteomics reveal expression changes in sulfur metabolic genes under different conditions. Post-translational modifications such as persulfidation can be detected by proteomic methods [4,8].
Enzymatic activity assays
Enzyme activity assays for CBS, CTH, and glutathione synthesis enzymes measure catalytic rates and are used to validate genetic models.
Microbial sulfur metabolism assays
Microbial growth on sulfur compounds, sulfide oxidation rates, and methanethiol production are measured using colorimetric and chromatographic methods [1,5,7].
How CRISPR Can Be Used to Study GO:0006790 sulfur compound metabolic process
Knockout
CRISPR knockout of sulfur metabolic genes such as CBS, CTH, or GCLC creates cell models to study loss-of-function phenotypes, including altered homocysteine, cysteine, and glutathione levels.
Point Mutation
Point mutations in genes like MTR or CBS can mimic human disease alleles, allowing researchers to study the functional impact of specific variants on enzyme activity and pathway flux.
Knock-in
Knock-in of tagged versions of sulfur enzymes (e.g., GFP-MPST) enables live-cell imaging and localization studies, while knock-in of disease mutations provides isogenic models.
Overexpression
Overexpression of sulfur metabolic genes such as GCLC or CTH increases pathway flux and can protect cells from oxidative stress, useful for studying gain-of-function effects.
How EDITGENE Supports sulfur compound metabolic process Research
Researchers studying sulfur compound metabolic process-related genes often need to determine whether a candidate gene is causally involved in a specific phenotype, such as altered glutathione levels or homocysteine accumulation. CRISPR-based models provide a precise way to test these hypotheses by introducing targeted genetic changes.
Contact EDITGENE today to design your custom CRISPR model for sulfur compound metabolic process research.
Related Products
| Product name | Cat.No. | Species | Gene ID | |
|---|---|---|---|---|
| CHST6 Knockout HEK293 Cell Line | EDJ-KQ5185 | Human | 4166 | Details Get a Quote |
| MMUT Knockout HEK293 Cell Line | EDJ-KQ5274 | Human | 4594 | Details Get a Quote |
| SULT1E1 Knockout HEK293 Cell Line | EDJ-KQ5855 | Human | 6783 | Details Get a Quote |
| SULT1A2 Knockout HEK293 Cell Line | EDJ-KQ5859 | Human | 6799 | Details Get a Quote |
| SULT1A1 Knockout HEK293 Cell Line | EDJ-KQ5864 | Human | 6817 | Details Get a Quote |
| SULT2A1 Knockout HEK293 Cell Line | EDJ-KQ5865 | Human | 6822 | Details Get a Quote |
| CHST1 Knockout HEK293 Cell Line | EDJ-KQ6274 | Human | 8534 | Details Get a Quote |
| CHST2 Knockout HEK293 Cell Line | EDJ-KQ6586 | Human | 9435 | Details Get a Quote |
| CHST3 Knockout HEK293 Cell Line | EDJ-KQ6597 | Human | 9469 | Details Get a Quote |
| CHST4 Knockout HEK293 Cell Line | EDJ-KQ6931 | Human | 10164 | Details Get a Quote |
| ARSG Knockout HEK293 Cell Line | EDJ-KQ7733 | Human | 22901 | Details Get a Quote |
| CHST5 Knockout HEK293 Cell Line | EDJ-KQ8072 | Human | 23563 | Details Get a Quote |
| SULT1B1 Knockout HEK293 Cell Line | EDJ-KQ8742 | Human | 27284 | Details Get a Quote |
| CHST9 Knockout HEK293 Cell Line | EDJ-KQ9855 | Human | 83539 | Details Get a Quote |
| GAL3ST3 Knockout HEK293 Cell Line | EDJ-KQ10505 | Human | 89792 | Details Get a Quote |
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Frequently Asked Questions About sulfur compound metabolic process
What is sulfur compound metabolic process?
Sulfur compound metabolic process (GO:0006790) is the set of chemical reactions and pathways involving sulfur or sulfur-containing compounds, such as methionine, cysteine, and glutathione.
What genes are involved in sulfur compound metabolic process?
Key genes include CBS, CTH, MTR, MTRR, BHMT, GCLC, GCLM, GSS, MPST, and SQOR, among others [3,8].
What is the transsulfuration pathway?
The transsulfuration pathway interconverts homocysteine and cysteine via cystathionine, using enzymes CBS and CTH.
How is sulfur metabolism linked to disease?
Dysregulation of sulfur metabolism is associated with cardiovascular disease, neurodegeneration, and cancer, often through altered homocysteine or glutathione levels [3,6].
What are reactive sulfur species?
Reactive sulfur species include hydrogen sulfide (H2S), persulfides, and polysulfides, which can modify proteins and act as signaling molecules.
How do microbes contribute to sulfur cycling?
Microbes transform sulfur compounds through methanethiol cycling, sulfide oxidation, and phototrophic sulfur metabolism, impacting global biogeochemistry [1,5,7].
What methods are used to study sulfur metabolism?
Common methods include LC-MS metabolomics, stable isotope tracing, RNA-seq, proteomics, and enzyme activity assays [3,4].
Can CRISPR be used to study sulfur metabolism?
Yes, CRISPR knockout, point mutation, knock-in, and overexpression models enable precise genetic dissection of sulfur metabolic genes [2,3].
What is the role of glutathione in sulfur metabolism?
Glutathione is a sulfur-containing tripeptide antioxidant synthesized from cysteine, glutamate, and glycine, and it maintains redox homeostasis.
Why is sulfur metabolism important for biotechnology?
Microbial sulfur metabolism is used in biodesulfurization to remove sulfur from fuels, reducing environmental pollution.
Conclusion
Sulfur compound metabolic process (GO:0006790) is a fundamental biological process that encompasses the synthesis, interconversion, and degradation of sulfur-containing molecules. Its central pathways, including transsulfuration and glutathione synthesis, are critical for redox balance, amino acid homeostasis, and cellular signaling. Dysregulation of these pathways contributes to cardiovascular, neurological, and metabolic diseases, while microbial sulfur transformations drive global biogeochemical cycles. CRISPR-based models offer powerful tools to dissect the causal roles of sulfur metabolic genes, and EDITGENE provides comprehensive services to support this research.
References
- 1. Schäfer H et al.. 2019. Microbial Cycling of Methanethiol.. Curr Issues Mol Biol 33:173-182 PMID: 31166191
- 2. Martínez I et al.. 2017. Metabolic and process engineering for biodesulfurization in Gram-negative bacteria.. J Biotechnol 262:47-55 PMID: 28947364
- 3. Sbodio JI et al.. 2019. Regulators of the transsulfuration pathway.. Br J Pharmacol 176(4):583-593 PMID: 30007014
- 4. García-Giménez JL et al.. 2019. Oxidative post-translational modifications in histones.. Biofactors 45(5):641-650 PMID: 31185139
- 5. Chen SC et al.. 2025. Microbial iron oxide respiration coupled to sulfide oxidation.. Nature 646(8086):925-933 PMID: 40866705
- 6. Blachier F et al.. 2020. Sulfur-Containing Amino Acids and Lipid Metabolism.. J Nutr 150(Suppl 1):2524S-2531S PMID: 33000164
- 7. Frigaard NU et al.. 2009. Sulfur metabolism in phototrophic sulfur bacteria.. Adv Microb Physiol 54:103-200 PMID: 18929068
- 8. Nagy P et al.. 2019. Highlighted mechanistic aspects in the chemical biology of reactive sulfur species.. Br J Pharmacol 176(4):511-513 PMID: 30680717
