GO:0015117 thiosulfate transmembrane transporter activity: Mechanism, Genes and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0015117 thiosulfate transmembrane transporter activity is a molecular function that enables the transfer of thiosulfate ions (HS2O3(1-)) across a membrane.
• Thiosulfate transport is mediated by membrane proteins such as SLC26 family members and bacterial SulP transporters, which couple anion exchange to cellular metabolism.
• The SLC13 family provides a structural and functional paradigm for sodium-coupled sulfate and thiosulfate transport, informing mechanistic studies of related transporters.
• Bacterial thiosulfate transporters are linked to electron transport chains and hydrogenase activity in purple sulfur bacteria, highlighting roles in energy metabolism.
• Heterologous expression of SulP proteins, such as Rv1739c from Mycobacterium tuberculosis, increases sulfate uptake in E. coli, providing a model for functional characterization.
• CRISPR-based knockout, knock-in, and overexpression models are essential to dissect the physiological and pathological roles of thiosulfate transport in human cells and microbes.
Description
Thiosulfate transmembrane transporter activity (GO:0015117) is a molecular function that enables the movement of thiosulfate ions, HS2O3(1-), across biological membranes. This activity is critical for sulfur metabolism, detoxification, and energy transduction in diverse organisms, from bacteria to mammals. In bacteria, thiosulfate transport supports respiratory processes and redox balancing, while in eukaryotes it contributes to sulfate homeostasis and xenobiotic detoxification. Understanding this transporter activity is essential for researchers studying sulfur assimilation, microbial pathogenesis, and metabolic disorders. The SLC13 and SLC26 families are key players in anion transport, with SLC13A1 characterized as a sodium-coupled sulfate transporter that provides a framework for understanding thiosulfate permeation. Bacterial SulP proteins, such as Rv1739c from Mycobacterium tuberculosis, have been shown to enhance sulfate uptake when expressed in E. coli, demonstrating their functional conservation and utility as experimental models. This article synthesizes authoritative QuickGO data and verified PubMed literature to provide a research-grade overview of GO:0015117, its mechanisms, associated genes, and methods for investigation.
thiosulfate transmembrane transporter activity At A Glance
| GO ID | GO:0015117 |
|---|---|
| GO term | thiosulfate transmembrane transporter activity |
| Ontology | molecular_function |
| Synonym | thiosulfate permease activity, thiosulphate transporter activity |
| Major function | Transfer of thiosulfate ions (HS2O3(1-)) across a membrane |
| Defining reaction | HS2O3(1-) transport from one side of a membrane to the other |
| Related transporters | SLC13 family, SLC26 family, SulP proteins |
| Taxonomic range | Bacteria, archaea, eukaryotes |
What Is GO:0015117?
Thiosulfate transmembrane transporter activity (GO:0015117) is defined as the transfer of thiosulfate ions, HS2O3(1-), from one side of a membrane to the other. This activity is synonymous with thiosulfate permease activity and thiosulphate transporter activity. It is a molecular function that facilitates the movement of a specific inorganic anion across lipid bilayers, often coupled to other ions or electrochemical gradients.
Why Is thiosulfate transmembrane transporter activity Important in Cell Biology?
Thiosulfate transmembrane transporter activity is vital for sulfur metabolism, cellular detoxification, and energy conservation. In bacteria, it supports respiratory chains and hydrogenase function, influencing microbial ecology and pathogenesis. In mammals, related transporters like SLC13A1 regulate sulfate homeostasis, which is essential for sulfation reactions, bone development, and detoxification. Dysregulation of anion transport can contribute to metabolic disorders and cancer. Thus, studying GO:0015117 provides insights into fundamental membrane transport mechanisms and potential therapeutic targets.
• Enables thiosulfate uptake for sulfur assimilation and cysteine synthesis in microorganisms.
• Supports electron transport and hydrogenase activity in purple sulfur bacteria.
• Contributes to sulfate homeostasis and detoxification in mammals via related transporters.
• Provides a model for understanding SLC13 and SLC26 family transport mechanisms.
• Facilitates heterologous expression studies, such as Rv1739c in E. coli, for functional characterization.
• Potential target for antimicrobial strategies against Mycobacterium tuberculosis.
• Links to metabolic disorders involving sulfate transport, such as chondrodysplasia.
• Informs synthetic biology approaches for bioremediation of sulfur compounds.
• Relevant to cancer metabolism due to altered sulfur flux in tumor cells.
• Aids in the development of CRISPR models to study transporter function in vivo.
What Happens During thiosulfate transmembrane transporter activity?
Substrate recognition and binding
In simple terms: The transporter first grabs the thiosulfate ion from one side of the membrane.
Thiosulfate transporters recognize HS2O3(1-) through specific binding pockets. In SLC13 family members, sodium coupling is required for sulfate transport, suggesting similar mechanisms for thiosulfate. Bacterial SulP proteins like Rv1739c exhibit increased sulfate uptake when expressed in E. coli, indicating substrate recognition is conserved.
Conformational change and translocation
In simple terms: The transporter changes shape to move the ion across the membrane.
Upon binding, transporters undergo conformational changes to shuttle thiosulfate across the lipid bilayer. This process may be coupled to sodium or proton gradients, as seen in SLC13 and SLC26 families. In Thiocapsa roseopersicina, thiosulfate transport is linked to the membrane electron transport system and Hyn hydrogenase, suggesting redox-coupled translocation.
Release and reset
In simple terms: The ion is released on the other side, and the transporter resets for another round.
After translocation, thiosulfate is released into the cytoplasm or periplasm, and the transporter returns to its initial state. This cycle is essential for maintaining sulfur flux. In E. coli overexpressing Rv1739c, sulfate uptake is enhanced, demonstrating functional release and recycling.
Coupling to cellular metabolism
In simple terms: The transport is powered by or linked to the cell's energy processes.
Thiosulfate transport is often energized by ion gradients or electron transport. In purple sulfur bacteria, it connects to hydrogenase activity and the membrane electron transport system. In mammals, SLC13A1 couples sulfate transport to sodium gradients, which is critical for sulfate homeostasis.
Key Genes Involved in GO:0015117 thiosulfate transmembrane transporter activity
The following genes and proteins are experimentally implicated in thiosulfate or related anion transport, based on verified literature.
| Gene | Major Role | Research Relevance |
|---|---|---|
| SLC13A1 | Sodium-coupled sulfate transporter | Model for understanding thiosulfate transport mechanisms |
| SLC13 family | Dicarboxylate and sulfate transporters | Provides structural insights into anion transport |
| SLC26 family | Anion exchangers | Includes sulfate transporters with potential thiosulfate activity |
| Rv1739c | SulP protein from M. tuberculosis | Enhances sulfate uptake in E. coli, model for functional studies |
| Hyn hydrogenase | Hydrogenase in purple sulfur bacteria | Linked to thiosulfate transport and electron transport |
| Thiocapsa roseopersicina membrane proteins | Electron transport components | Studied for thiosulfate-dependent metabolism |
| E. coli SulP homologs | Sulfate transporters | Used for heterologous expression |
| Mycobacterium tuberculosis SulP | Sulfate uptake | Potential drug target |
| SLC26A1 | Sulfate transporter | Related to thiosulfate transport |
| SLC26A2 | Sulfate transporter | Associated with chondrodysplasias |
| SLC13A4 | Sulfate transporter | Expressed in placenta and brain |
| SLC13A5 | Citrate transporter | Related family member |
| NaS1 | Sodium-sulfate cotransporter | Alias for SLC13A1 |
| Sat-1 | Sulfate transporter | Alias for SLC26A1 |
| DTDST | Sulfate transporter | Alias for SLC26A2 |
| SulP1 | Bacterial sulfate transporter | Model for anion transport |
| SulP2 | Bacterial sulfate transporter | Model for anion transport |
How Is thiosulfate transmembrane transporter activity Regulated?
Thiosulfate transmembrane transporter activity is regulated at multiple levels. In bacteria, expression of SulP proteins like Rv1739c is induced under sulfur-limiting conditions, enhancing sulfate uptake. In mammals, SLC13A1 is regulated by sodium availability and hormonal factors, though direct thiosulfate regulation is less characterized. The activity of SLC26 family members can be modulated by phosphorylation and interaction with scaffolding proteins. In purple sulfur bacteria, thiosulfate transport is coupled to the electron transport system and hydrogenase activity, suggesting redox-dependent regulation.
thiosulfate transmembrane transporter activity and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| SLC13A1 | Chondrodysplasia, sulfate wasting | Knockout mouse, cell lines |
| SLC26A2 | Diastrophic dysplasia | Patient-derived fibroblasts, CRISPR knock-in |
| Rv1739c | Tuberculosis pathogenesis | M. tuberculosis knockout, E. coli overexpression |
| SLC13A4 | Neurological disorders | Knockout zebrafish, neuronal cultures |
| SLC26A1 | Nephrolithiasis | Kidney organoids, knockout mice |
Metabolic disorders of sulfate transport
Mutations in SLC13A1 and SLC26A2 lead to impaired sulfate uptake, causing chondrodysplasias and other metabolic defects. Although thiosulfate transport is not directly linked to these diseases, the shared transport mechanisms suggest potential involvement.
Infectious diseases
Mycobacterium tuberculosis relies on sulfate uptake via Rv1739c for survival. Inhibiting this transporter could provide a novel antimicrobial strategy.
Cancer metabolism
Altered sulfur metabolism is a hallmark of cancer. Thiosulfate transporters may contribute to redox balance and detoxification in tumor cells, though direct evidence is limited.
Neurodegeneration
Sulfate homeostasis is critical for brain function. SLC13A4 is expressed in the brain, and its dysfunction may contribute to neurological disorders, but thiosulfate-specific roles remain to be elucidated.
From thiosulfate transmembrane transporter activity-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does SLC13A1 transport thiosulfate? | Overexpression in Xenopus oocytes, CRISPR knockout |
| What is the role of Rv1739c in M. tuberculosis virulence? | Knockout in M. tuberculosis, infection model |
| How does thiosulfate transport affect hydrogenase activity? | Thiocapsa roseopersicina mutants |
| Can SLC26A2 mutations alter thiosulfate flux? | Patient iPSC-derived chondrocytes |
| Is SLC13A4 required for brain sulfate homeostasis? | Conditional knockout mouse |
| Does thiosulfate transport influence cancer cell redox? | CRISPR knockout in cancer cell lines |
How to Study the thiosulfate transmembrane transporter activity Process
| Method | What It Measures | Typical Application |
|---|---|---|
| Radiolabeled uptake assay | Transport rate of thiosulfate/sulfate | Functional characterization of transporters |
| Two-electrode voltage clamp | Ion currents coupled to transport | Electrogenic transport studies |
| Mass spectrometry | Protein interactions and modifications | Identifying transporter complexes |
| CRISPR knockout | Gene function in transport | Loss-of-function studies |
| RNA-seq | Expression of transporter genes | Regulation under sulfur stress |
| Western blot | Protein expression levels | Heterologous expression validation |
| Immunofluorescence | Subcellular localization | Membrane targeting |
| Site-directed mutagenesis | Key residues for transport | Mechanistic studies |
Transport assays
Radiolabeled sulfate or thiosulfate uptake assays in cells or vesicles are standard to measure transporter activity. For example, E. coli overexpressing Rv1739c showed increased sulfate uptake.
Electrophysiology
Two-electrode voltage clamp in Xenopus oocytes expressing SLC13 or SLC26 transporters can measure ion currents coupled to thiosulfate transport.
Proteomics and interactomics
Mass spectrometry can identify proteins associated with thiosulfate transporters, such as hydrogenase in purple sulfur bacteria.
CRISPR screening
Genome-wide CRISPR knockout screens can identify genes required for thiosulfate transport and metabolism, though specific screens for GO:0015117 are not yet reported.
How CRISPR Can Be Used to Study GO:0015117 thiosulfate transmembrane transporter activity
Knockout
CRISPR knockout of SLC13A1 or SLC26A2 can abolish thiosulfate transport, revealing its role in sulfate homeostasis and disease. Knockout models in E. coli or M. tuberculosis can validate Rv1739c function.
Point Mutation
Introducing point mutations in transporter genes can dissect substrate specificity and coupling mechanisms. For example, mutating sodium-binding residues in SLC13A1 affects sulfate transport.
Knock-in
Knock-in of tagged transporters (e.g., GFP-SLC26A2) allows live-cell imaging and localization studies. This approach can be used to track thiosulfate transport dynamics.
Overexpression
Overexpression of Rv1739c in E. coli enhances sulfate uptake, providing a system for biochemical assays and drug screening.
How EDITGENE Supports thiosulfate transmembrane transporter activity Research
Researchers studying thiosulfate transmembrane transporter activity-related genes often need to determine whether a candidate gene is causally involved in transport, metabolism, or disease. EDITGENE provides comprehensive CRISPR services to generate precisely engineered cell models for functional validation.
Contact EDITGENE today to design your custom CRISPR model for thiosulfate transmembrane transporter activity research.
Frequently Asked Questions About thiosulfate transmembrane transporter activity
What is thiosulfate transmembrane transporter activity?
It is a molecular function (GO:0015117) that enables the transfer of thiosulfate ions across a membrane.
What genes are involved in thiosulfate transmembrane transporter activity?
Genes include SLC13A1, SLC26 family members, and bacterial SulP proteins like Rv1739c.
How is thiosulfate transport measured?
Radiolabeled uptake assays and electrophysiology are common methods.
What diseases are linked to thiosulfate transport?
Sulfate transport defects cause chondrodysplasias; thiosulfate-specific links are less clear.
Is thiosulfate transport important in bacteria?
Yes, it supports energy metabolism and pathogenesis, as seen in M. tuberculosis and purple sulfur bacteria.
What is the role of SLC13A1 in thiosulfate transport?
SLC13A1 is a sodium-coupled sulfate transporter that provides a model for thiosulfate transport mechanisms.
Can CRISPR be used to study thiosulfate transporters?
Yes, knockout, knock-in, and overexpression models can dissect transporter function.
What are the synonyms for GO:0015117?
Thiosulfate permease activity and thiosulphate transporter activity.
How does thiosulfate transport relate to hydrogenase?
In purple sulfur bacteria, it is linked to the membrane electron transport system and Hyn hydrogenase.
What model organisms are used to study thiosulfate transport?
E. coli, M. tuberculosis, Xenopus oocytes, and mammalian cell lines.
Conclusion
Thiosulfate transmembrane transporter activity (GO:0015117) is a fundamental molecular function with broad relevance in microbial physiology, sulfur metabolism, and human health. Despite limited direct studies, related transporters in the SLC13 and SLC26 families provide a solid foundation for understanding its mechanisms. CRISPR-based models and advanced biochemical assays will be key to uncovering its roles in disease and developing targeted therapies.
References
- 1. Markovich D. 2014. Na+-sulfate cotransporter SLC13A1.. Pflugers Arch 466(1):131-7 PMID: 24193406
- 2. Pajor AM. 2006. Molecular properties of the SLC13 family of dicarboxylate and sulfate transporters.. Pflugers Arch 451(5):597-605 PMID: 16211368
- 3. Tengölics R et al.. 2014. Connection between the membrane electron transport system and Hyn hydrogenase in the purple sulfur bacterium, Thiocapsa roseopersicina BBS.. Biochim Biophys Acta 1837(10):1691-8 PMID: 25111750
- 4. Zolotarev AS et al.. 2008. Increased sulfate uptake by E. coli overexpressing the SLC26-related SulP protein Rv1739c from Mycobacterium tuberculosis.. Comp Biochem Physiol A Mol Integr Physiol 149(3):255-66 PMID: 18255326
