GO:0004792 thiosulfate-cyanide sulfurtransferase activity: Mechanism, Genes and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0004792 thiosulfate-cyanide sulfurtransferase activity catalyzes the reaction thiosulfate + hydrogen cyanide = thiocyanate + sulfite + 2 H+, a core cyanide detoxification step.
• The enzyme is widely known as rhodanese and is encoded in humans by TST, with TSTD1 and TSTD2 as related thiosulfate sulfurtransferase-like proteins.
• Beyond cyanide detoxification, thiosulfate sulfurtransferase activity contributes to hydrogen sulfide metabolism, mitochondrial redox balance, and protection against oxidative distress.
• Loss or deficiency of thiosulfate sulfurtransferase activity is linked to hyperglycemic tissue damage, aberrant NRF2 signaling, and neurodegeneration-related oxidative stress.
• Cyanide exposure alters thiosulfate sulfurtransferase, 3-mercaptopyruvate sulfurtransferase, and cystathionine gamma-lyase activities in a dose- and time-dependent manner.
• CRISPR knockout, point-mutation, knock-in, and overexpression models enable causal dissection of TST/TSTD1/TSTD2 function in cyanide detoxification and sulfide biology.
Description
GO:0004792 thiosulfate-cyanide sulfurtransferase activity is a molecular function defined by the catalysis of the reaction thiosulfate + hydrogen cyanide = thiocyanate + sulfite + 2 H+. This activity, historically called rhodanese, is one of the best-characterized enzymatic mechanisms for converting toxic cyanide into the far less toxic thiocyanate, and it is therefore central to cellular defense against cyanide poisoning. The same catalytic chemistry also intersects with hydrogen sulfide metabolism and mitochondrial sulfur trafficking, making it relevant to redox biology and mitochondrial function. Researchers study this activity because it sits at the interface of toxicology, sulfur biochemistry, and oxidative-stress responses, and because its dysregulation has been implicated in metabolic and neurodegenerative phenotypes. The human genome encodes canonical TST as well as TSTD1 and TSTD2, which contain thiosulfate sulfurtransferase-like domains and interact with redox partners such as thioredoxin. Understanding GO:0004792 therefore requires integrating enzymology, mitochondrial biology, and disease models, which is why CRISPR-based cell models are increasingly used to test causality for TST-family genes.
thiosulfate-cyanide sulfurtransferase activity At A Glance
| GO ID | GO:0004792 |
|---|---|
| GO term | thiosulfate-cyanide sulfurtransferase activity |
| Ontology | molecular_function |
| Synonym | rhodanese activity; rhodanase activity; thiosulfate:cyanide sulfurtransferase activity; thiosulfate sulfurtransferase activity; thiosulfate cyanide transsulfurase activity; thiosulfate thiotransferase activity; thiosulphate sulphurtransferase activity |
| Definition | Catalysis of the reaction: thiosulfate + hydrogen cyanide = thiocyanate + sulfite + 2 H+ |
| Major function | Cyanide detoxification by conversion of cyanide to thiocyanate, with additional roles in hydrogen sulfide and mitochondrial sulfur metabolism |
| Representative human genes | TST, TSTD1, TSTD2 |
| Related activities | 3-mercaptopyruvate sulfurtransferase activity and cystathionine gamma-lyase activity contribute to overlapping sulfur/cyanide metabolism |
| Disease relevance | Oxidative distress, NRF2 dysfunction, hyperglycemic tissue damage, and neurodegeneration-related stress responses |
What Is GO:0004792?
In simple terms, GO:0004792 describes an enzyme activity that takes a sulfur atom from thiosulfate and hands it to cyanide, producing thiocyanate, sulfite, and two protons. The official definition is: Catalysis of the reaction: thiosulfate + hydrogen cyanide = thiocyanate + sulfite + 2 H+. This activity is synonymous with rhodanese activity, thiosulfate:cyanide sulfurtransferase activity, and thiosulfate sulfurtransferase activity. It is a molecular_function term, meaning it describes what a protein does at the catalytic level rather than where it acts or which pathway it belongs to. The reaction is a sulfurtransferase step, and the enzyme uses a persulfide intermediate to transfer sulfur from thiosulfate to the cyanide acceptor.
Why Is thiosulfate-cyanide sulfurtransferase activity Important in Cell Biology?
GO:0004792 is important because it defines the enzymatic step that detoxifies cyanide, a rapidly acting mitochondrial poison, and because the same sulfurtransferase chemistry participates in hydrogen sulfide signaling and mitochondrial redox homeostasis. In experimental systems, changes in thiosulfate sulfurtransferase activity are observed after cyanide exposure and are linked to oxidative distress and altered NRF2 function in the brain. The activity also protects renal tissue from hyperglycemic damage in diabetes models, indicating broad physiological relevance beyond acute poisoning. Because TST-family proteins include TSTD1 and TSTD2, which interact with thioredoxin and contain sulfurtransferase-like domains, the term connects to redox regulation and protein quality-control networks. For researchers, GO:0004792 provides a precise functional annotation for interpreting knockout, knockdown, and overexpression phenotypes in sulfur and cyanide metabolism.
• Provides the canonical enzymatic route for cyanide detoxification by converting cyanide to thiocyanate.
• Supports hydrogen sulfide metabolism and mitochondrial sulfur trafficking, linking to sulfide quinone oxidoreductase-dependent pathways.
• Deficiency is associated with oxidative distress and aberrant NRF2 function in the brain.
• Protects against hyperglycemic damage in experimental diabetes models, indicating a role in metabolic stress responses.
• Cyanide exposure alters thiosulfate sulfurtransferase activity alongside 3-mercaptopyruvate sulfurtransferase and cystathionine gamma-lyase.
• TSTD1 interacts with thioredoxin, connecting thiosulfate sulfurtransferase-like domains to redox regulation.
• Antidotes for acute cyanide poisoning may act in part through related sulfurtransferase activities, highlighting pharmacological relevance.
• Serves as a functional annotation for interpreting TST, TSTD1, and TSTD2 perturbation experiments.
• Enables cross-species studies, including zebrafish models of diabetic kidney damage.
• Provides a mechanistic anchor for CRISPR screens targeting sulfur and cyanide metabolism genes.
Molecular Mechanism of thiosulfate-cyanide sulfurtransferase activity
Substrate binding and sulfur transfer
In simple terms: The enzyme grabs sulfur from thiosulfate and passes it to cyanide.
The catalytic cycle begins with binding of thiosulfate, which serves as the sulfur donor, and cyanide, which serves as the sulfur acceptor. The enzyme forms a covalent persulfide intermediate on a catalytic cysteine, releasing sulfite, and then transfers the sulfur to cyanide to produce thiocyanate. This two-step ping-pong mechanism is the defining feature of thiosulfate-cyanide sulfurtransferase activity and explains why the reaction yields thiocyanate, sulfite, and two protons.
Catalytic cysteine and persulfide intermediate
In simple terms: A reactive sulfur atom is held on the enzyme before being handed off.
Thiosulfate sulfurtransferase enzymes use a catalytic cysteine residue to form a persulfide intermediate during turnover. This intermediate is central to the sulfurtransferase reaction and distinguishes it from simple hydrolysis or redox reactions. The persulfide chemistry also underlies the ability of TST-family proteins to participate in broader sulfur trafficking and redox-linked processes.
Cofactors and redox context
In simple terms: The enzyme works in a redox environment and can interact with thioredoxin systems.
Thiosulfate sulfurtransferase activity operates within a cellular redox context, and TSTD1 has been shown to interact with thioredoxin, linking sulfurtransferase-like domains to redox regulation. Hydrogen sulfide-dependent pathways, including sulfide quinone oxidoreductase activation, further connect sulfurtransferase chemistry to mitochondrial electron transport and redox balance. These interactions mean that the activity is not isolated but is embedded in a network of sulfur and redox reactions.
Regulation by substrate availability and stress
In simple terms: How much cyanide or thiosulfate is around, and how stressed the cell is, changes the activity.
Thiosulfate sulfurtransferase activity is influenced by substrate availability and by exposure to cyanide, with dose- and time-dependent effects observed on thiosulfate sulfurtransferase, 3-mercaptopyruvate sulfurtransferase, and cystathionine gamma-lyase activities. Deficiency of thiosulfate sulfurtransferase promotes oxidative distress and aberrant NRF2 function, indicating that stress-responsive signaling feeds back on sulfurtransferase biology. In diabetes models, thiosulfate sulfurtransferase prevents hyperglycemic damage to the zebrafish pronephros, showing that metabolic stress modulates the physiological impact of the activity.
Relationship to related sulfurtransferases
In simple terms: Other enzymes can do similar sulfur-transfer chemistry, so the term overlaps with related activities.
3-mercaptopyruvate sulfurtransferase and cystathionine gamma-lyase contribute to cyanide and sulfur metabolism and are often studied alongside thiosulfate sulfurtransferase activity. Antidotes for acute cyanide poisoning may act on mercaptopyruvate sulfurtransferase to facilitate detoxification, underscoring the functional overlap among sulfurtransferases. TSTD2 and TSTD1 contain thiosulfate sulfurtransferase-like domains, expanding the set of proteins that may carry related catalytic or regulatory roles.
Key Genes Involved in GO:0004792 thiosulfate-cyanide sulfurtransferase activity
The following genes and proteins are directly or functionally associated with GO:0004792 thiosulfate-cyanide sulfurtransferase activity and its related sulfur metabolism.
| Gene | Major Role | Research Relevance |
|---|---|---|
| TST | Canonical thiosulfate sulfurtransferase (rhodanese) catalyzing thiosulfate + cyanide to thiocyanate + sulfite | Core enzyme for GO:0004792; target for knockout and overexpression studies |
| TSTD1 | Thiosulfate sulfurtransferase-like domain-containing protein that interacts with thioredoxin | Links sulfurtransferase-like domains to redox regulation |
| TSTD2 | Thiosulfate sulfurtransferase-like domain-containing protein | Candidate for sulfurtransferase-related functions and CRISPR screening |
| MPST | 3-mercaptopyruvate sulfurtransferase contributing to cyanide and sulfur metabolism | Studied alongside TST in cyanide exposure models |
| CTH | Cystathionine gamma-lyase contributing to sulfur amino acid and cyanide metabolism | Measured with TST and MPST after cyanide exposure |
| SQOR | Sulfide quinone oxidoreductase activated in a hydrogen sulfide-dependent manner | Connects sulfide metabolism to mitochondrial redox |
| NRF2 | Transcription factor controlling antioxidant responses | Aberrant NRF2 function observed with thiosulfate sulfurtransferase deficiency |
| TXN | Thioredoxin redox partner | Interacts with TSTD1 and supports redox regulation |
| Urm1 | Non-canonical ubiquitin-like protein involved in sulfur transfer | Provides evolutionary context for sulfurtransferase-related pathways |
| TST (zebrafish) | Thiosulfate sulfurtransferase ortholog | Used to model hyperglycemic pronephros damage |
| TSTD1 (human) | Thioredoxin-interacting sulfurtransferase-like protein | Model for redox-linked sulfurtransferase function |
| TSTD2 (human) | Sulfurtransferase-like protein | Candidate for functional annotation and knockout studies |
| MPST (human) | Mercaptopyruvate sulfurtransferase | Target of cyanide antidote research |
| CTH (human) | Cystathionine gamma-lyase | Sulfur metabolism enzyme co-regulated with TST |
| SQOR (human) | Sulfide quinone oxidoreductase | Mitochondrial sulfide oxidation link |
| NRF2 (human) | Oxidative stress-responsive transcription factor | Readout for thiosulfate sulfurtransferase deficiency |
| TXN (human) | Thioredoxin | Redox partner for TSTD1 |
| Urm1 (eukaryotic) | Ubiquitin-like sulfur carrier | Model for sulfur transfer evolution |
How Is thiosulfate-cyanide sulfurtransferase activity Regulated?
Thiosulfate sulfurtransferase activity is regulated at the level of substrate availability and stress exposure, with dose- and time-dependent changes observed after cyanide treatment. Deficiency of thiosulfate sulfurtransferase promotes oxidative distress and aberrant NRF2 function, indicating feedback between redox signaling and sulfurtransferase activity. In diabetes models, hyperglycemic stress reveals a protective role for thiosulfate sulfurtransferase in the zebrafish pronephros, suggesting metabolic context influences its physiological impact. Hydrogen sulfide-dependent activation of sulfide quinone oxidoreductase further links sulfurtransferase-related sulfur pools to mitochondrial redox regulation.
thiosulfate-cyanide sulfurtransferase activity and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| TST | Cyanide poisoning and oxidative stress | TST knockout and overexpression cell models |
| TST | Hyperglycemic tissue damage | Zebrafish pronephros diabetes model |
| TST | Neurodegeneration-related oxidative distress | Brain-specific knockout or knockdown models |
| TSTD1 | Redox regulation via thioredoxin interaction | TSTD1 knockout and tagged knock-in cells |
| MPST | Cyanide detoxification and antidote response | MPST knockout cells with cyanide challenge |
Cyanide poisoning and acute toxicity
Thiosulfate-cyanide sulfurtransferase activity is a principal enzymatic route for cyanide detoxification, converting cyanide to thiocyanate. Cyanide exposure alters thiosulfate sulfurtransferase, 3-mercaptopyruvate sulfurtransferase, and cystathionine gamma-lyase activities in a dose- and time-dependent manner, which is directly relevant to acute poisoning. Antidotes for acute cyanide poisoning may act on mercaptopyruvate sulfurtransferase to facilitate detoxification, highlighting the therapeutic importance of sulfurtransferase chemistry.
Oxidative stress and neurodegeneration
Thiosulfate sulfurtransferase deficiency promotes oxidative distress and aberrant NRF2 function in the brain, linking loss of this activity to redox imbalance in neural tissue. Because NRF2 controls antioxidant gene programs, its dysregulation may amplify oxidative damage when thiosulfate sulfurtransferase activity is reduced. This connection positions GO:0004792 within neurodegeneration-related oxidative stress research.
Diabetic tissue damage
Thiosulfate sulfurtransferase prevents hyperglycemic damage to the zebrafish pronephros in an experimental model for diabetes, indicating a protective role in metabolic stress. This suggests that thiosulfate sulfurtransferase activity may help buffer tissues against hyperglycemia-induced injury. The finding supports further investigation of TST-family genes in diabetic kidney and metabolic disease models.
Sulfide and mitochondrial metabolism
Hydrogen sulfide-dependent activation of human sulfide quinone oxidoreductase connects sulfurtransferase-related sulfur pools to mitochondrial electron transport. TSTD1 interacts with thioredoxin, further linking thiosulfate sulfurtransferase-like domains to redox regulation. Together, these findings indicate that altered thiosulfate sulfurtransferase activity may influence mitochondrial sulfide handling and redox homeostasis.
From thiosulfate-cyanide sulfurtransferase activity-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does loss of TST reduce cyanide detoxification capacity? | TST knockout cell line |
| Does a catalytic cysteine mutation abolish sulfurtransferase activity? | Point-mutation knock-in of TST catalytic cysteine |
| Where does TST localize and with what does it interact? | Tagged knock-in of TST for imaging and proteomics |
| Does TSTD1 interact with thioredoxin in cells? | TSTD1 knockout and tagged knock-in models |
| Does overexpression protect against oxidative stress? | TST or TSTD1 overexpression cell models |
| Which genes modify cyanide sensitivity? | CRISPR library screening in TST-proficient and TST-deficient backgrounds |
How to Study the thiosulfate-cyanide sulfurtransferase activity Process
| Method | What It Measures | Typical Application |
|---|---|---|
| Thiocyanate formation assay | Thiosulfate-cyanide sulfurtransferase catalytic activity | Comparing wild-type and TST knockout cells |
| CRISPR knockout | Loss-of-function phenotype for candidate genes | Testing TST, TSTD1, TSTD2 requirement |
| Point-mutation knock-in | Requirement for specific residues such as catalytic cysteine | Dissecting catalytic mechanism |
| Tagged knock-in | Protein localization and interaction partners | Imaging and proteomics of TST-family proteins |
| Overexpression | Gain-of-function effects on stress resistance | Testing protection against oxidative stress |
| Redox/NRF2 reporter assays | Oxidative distress and NRF2 pathway activity | Linking sulfurtransferase loss to stress signaling |
| Sulfide quinone oxidoreductase activation assay | Hydrogen sulfide-dependent mitochondrial response | Connecting sulfur pools to mitochondrial redox |
| Zebrafish hyperglycemia model | Tissue damage under metabolic stress | Testing protective role of thiosulfate sulfurtransferase |
Enzymatic activity assays
Thiosulfate-cyanide sulfurtransferase activity can be measured by monitoring thiocyanate formation from thiosulfate and cyanide, the defining reaction of GO:0004792. Such assays are used to compare wild-type, knockout, and mutant cells after cyanide exposure, where dose- and time-dependent changes in thiosulfate sulfurtransferase, 3-mercaptopyruvate sulfurtransferase, and cystathionine gamma-lyase activities have been reported. Activity assays provide direct functional evidence that a gene product carries the annotated activity.
CRISPR-based genetic perturbation
CRISPR knockout, point mutation, knock-in, and overexpression models allow causal testing of TST, TSTD1, and TSTD2 function in sulfur and cyanide metabolism. Knockout cells can reveal whether loss of a candidate gene reduces thiosulfate-cyanide sulfurtransferase activity, while point mutations can test the requirement for the catalytic cysteine. Tagged knock-in models support localization and interaction studies for TST-family proteins.
Redox and stress readouts
Because thiosulfate sulfurtransferase deficiency promotes oxidative distress and aberrant NRF2 function, researchers use redox and NRF2 reporter assays to connect genotype to stress phenotypes. Hydrogen sulfide-dependent activation of sulfide quinone oxidoreductase provides an additional mitochondrial readout for sulfurtransferase-related sulfur pools. These readouts help interpret whether changes in GO:0004792 activity translate into cellular stress responses.
Disease-model phenotyping
Zebrafish pronephros models of hyperglycemia have been used to show that thiosulfate sulfurtransferase prevents diabetic tissue damage, illustrating how organismal models complement cell-based assays. Brain-focused studies of thiosulfate sulfurtransferase deficiency link the activity to oxidative distress and NRF2 dysfunction in neural tissue. Combining cell models with organismal phenotyping strengthens causal inference for GO:0004792-related genes.
How CRISPR Can Be Used to Study GO:0004792 thiosulfate-cyanide sulfurtransferase activity
Knockout
CRISPR knockout of TST or related genes is used to eliminate thiosulfate-cyanide sulfurtransferase activity and test downstream consequences such as cyanide sensitivity and oxidative distress. Knockout models of TSTD1 help determine whether thiosulfate sulfurtransferase-like domains contribute to redox regulation through thioredoxin interaction. Loss-of-function studies in the brain context can reveal whether deficiency promotes aberrant NRF2 function.
Point Mutation
Point-mutation knock-in can be used to mutate the catalytic cysteine of TST and test whether thiosulfate-cyanide sulfurtransferase activity is abolished. Such models distinguish catalytic function from structural or interaction roles of the protein. Point mutations also allow precise testing of residues implicated in persulfide intermediate formation.
Knock-in
Tagged knock-in of TST or TSTD1 enables localization and interaction studies, including testing the thioredoxin interaction reported for TSTD1. Knock-in of disease-relevant variants can model how specific alleles affect thiosulfate-cyanide sulfurtransferase activity. These models support imaging and proteomic workflows that require endogenous-level expression.
Overexpression
Overexpression of TST or TSTD1 can test whether increased thiosulfate-cyanide sulfurtransferase activity protects cells from cyanide or oxidative stress. Gain-of-function models complement knockout studies by showing sufficiency rather than necessity. Overexpression in metabolic stress models can probe protective effects similar to those seen in zebrafish pronephros studies.
How EDITGENE Supports thiosulfate-cyanide sulfurtransferase activity Research
Researchers studying thiosulfate-cyanide sulfurtransferase activity-related genes often need to determine whether a candidate gene is causally involved in cyanide detoxification, sulfide metabolism, or oxidative stress responses. EDITGENE provides CRISPR-based cell model services that allow precise perturbation of TST, TSTD1, TSTD2, and related sulfur metabolism genes, enabling functional annotation of GO:0004792 in relevant cellular contexts.
Contact EDITGENE today to design your custom CRISPR model for thiosulfate-cyanide sulfurtransferase activity research.
Frequently Asked Questions About thiosulfate-cyanide sulfurtransferase activity
What is GO:0004792 thiosulfate-cyanide sulfurtransferase activity?
GO:0004792 is a molecular_function term describing catalysis of the reaction thiosulfate + hydrogen cyanide = thiocyanate + sulfite + 2 H+, commonly known as rhodanese activity.
What genes are involved in thiosulfate-cyanide sulfurtransferase activity?
The canonical human gene is TST, with TSTD1 and TSTD2 encoding thiosulfate sulfurtransferase-like proteins; MPST and CTH contribute to related sulfur and cyanide metabolism.
What does thiosulfate-cyanide sulfurtransferase actually do?
It transfers sulfur from thiosulfate to cyanide, producing thiocyanate and sulfite, thereby detoxifying cyanide.
Why is thiosulfate-cyanide sulfurtransferase important for cyanide poisoning?
It provides a major enzymatic route for converting toxic cyanide into less toxic thiocyanate, and cyanide exposure alters its activity in a dose- and time-dependent manner.
How is thiosulfate-cyanide sulfurtransferase activity measured?
Activity is typically measured by monitoring thiocyanate formation from thiosulfate and cyanide in enzymatic assays.
Is thiosulfate-cyanide sulfurtransferase linked to oxidative stress?
Yes, thiosulfate sulfurtransferase deficiency promotes oxidative distress and aberrant NRF2 function in the brain.
What is the relationship between TST and TSTD1?
TST is the canonical thiosulfate sulfurtransferase, while TSTD1 contains a thiosulfate sulfurtransferase-like domain and interacts with thioredoxin.
Can CRISPR be used to study thiosulfate-cyanide sulfurtransferase activity?
Yes, CRISPR knockout, point mutation, knock-in, and overexpression models allow causal testing of TST-family gene function.
Does thiosulfate sulfurtransferase protect against diabetic damage?
In a zebrafish experimental diabetes model, thiosulfate sulfurtransferase prevented hyperglycemic damage to the pronephros.
How does thiosulfate-cyanide sulfurtransferase relate to hydrogen sulfide metabolism?
Hydrogen sulfide-dependent activation of sulfide quinone oxidoreductase links sulfurtransferase-related sulfur pools to mitochondrial redox regulation.
Conclusion
GO:0004792 thiosulfate-cyanide sulfurtransferase activity defines a central enzymatic step in cyanide detoxification and sulfur metabolism, catalyzed canonically by TST and related by TSTD1 and TSTD2. Its biological importance extends to oxidative stress responses, NRF2 signaling, hydrogen sulfide metabolism, and protection against hyperglycemic tissue damage. Cyanide exposure modulates the activity alongside other sulfurtransferases, underscoring its toxicological relevance. CRISPR-based knockout, point-mutation, knock-in, and overexpression models provide the causal toolkit needed to dissect how TST-family genes contribute to these phenotypes.
References
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- 3. Roman JV et al.. 2025. Hydrogen sulfide-dependent activation of human sulfide quinone oxidoreductase.. J Biol Chem 301(10):110681 PMID: 40912653
- 4. Luo Y et al.. 2023. Thiosulfate sulfurtransferase deficiency promotes oxidative distress and aberrant NRF2 function in the brain.. Redox Biol 68:102965 PMID: 38000344
- 5. Libiad M et al.. 2018. Thiosulfate sulfurtransferase-like domain-containing 1 protein interacts with thioredoxin.. J Biol Chem 293(8):2675-2686 PMID: 29348167
- 6. Luo Y et al.. 2025. Thiosulphate sulfurtransferase: Biological roles and therapeutic potential.. Redox Biol 82:103595 PMID: 40107018
- 7. Al-Dahmani ZM et al.. 2022. Thiosulfate sulfurtransferase prevents hyperglycemic damage to the zebrafish pronephros in an experimental model for diabetes.. Sci Rep 12(1):12077 PMID: 35840638
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