GO:0008430 selenium binding: Mechanism, Genes and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0008430 selenium binding is a molecular function defined as binding to a selenium (Se) ion.
• Selenium is incorporated into selenoproteins as selenocysteine, and selenium-binding proteins (SELENBP1) bind selenium non-covalently.
• SELENBP1 is the archetypal selenium-binding protein and is implicated in cancer, renal injury, and ferroptosis regulation.
• Selenium binding to hemoglobin via selenotrisulfide represents a distinct chemical mode of selenium binding in blood.
• Dysregulated selenium binding is linked to thyroid autoimmunity, renal ischemia/reperfusion injury, and non-small cell lung cancer.
• CRISPR knockout, knock-in, and overexpression models are essential to dissect the causal roles of selenium-binding proteins.
Description
GO:0008430 selenium binding is a molecular function term in the Gene Ontology that describes the binding of a protein or other molecule to a selenium (Se) ion. Selenium is an essential trace element that is incorporated into selenoproteins as the amino acid selenocysteine, and it also participates in non-covalent binding interactions with proteins such as selenium-binding protein 1 (SELENBP1). The term is distinct from selenocysteine incorporation, as it specifically refers to the binding event rather than the catalytic or structural role of selenium within a protein. Understanding selenium binding is critical because selenium homeostasis is tightly linked to redox regulation, antioxidant defense, and cellular stress responses. Researchers study GO:0008430 to uncover how selenium-binding proteins sense and respond to selenium availability, and how these interactions influence disease processes such as cancer, renal injury, and thyroid autoimmunity. The function is not limited to a single protein; hemoglobin can also bind selenium via selenotrisulfide bonds, illustrating the chemical diversity of selenium binding in biological systems. This article synthesizes authoritative QuickGO data and verified PubMed literature to provide a research-grade overview of selenium binding, its molecular mechanisms, key genes, and experimental models for investigation.
selenium binding At A Glance
| GO ID | GO:0008430 |
|---|---|
| GO term | selenium binding |
| Ontology | molecular_function |
| Synonym | none |
| Definition | Binding to a selenium (Se) ion. |
| Major function | Non-covalent or covalent interaction with selenium, often influencing redox homeostasis and protein function. |
| Key protein | Selenium-binding protein 1 (SELENBP1) is the most studied selenium-binding protein in humans. |
| Chemical mode | Selenium can bind via selenotrisulfide bonds, as shown for human hemoglobin. |
| Disease relevance | Implicated in cancer, renal injury, ferroptosis, and thyroid autoimmunity. |
What Is GO:0008430?
Selenium binding (GO:0008430) is defined by the Gene Ontology as the binding to a selenium (Se) ion. This molecular function encompasses non-covalent and covalent interactions between a biomolecule and selenium, excluding the co-translational incorporation of selenocysteine into selenoproteins, which is covered by separate GO terms.
Why Is selenium binding Important in Cell Biology?
Selenium binding is important because selenium is an essential micronutrient with a narrow therapeutic window, and its binding to proteins regulates redox signaling, antioxidant defense, and cell survival. Dysregulated selenium binding is associated with cancer progression, renal tubular injury, and autoimmune thyroid disease, making it a target for mechanistic studies and therapeutic development.
• Selenium binding proteins such as SELENBP1 modulate intracellular selenium availability and redox balance.
• SELENBP1 protects renal tubular epithelial cells from ferroptosis by upregulating glutathione peroxidase 4.
• SELENBP1 inhibits malignant progression and induces apoptosis in non-small cell lung cancer.
• Selenium status influences thyroid autoimmunity, and selenium binding may affect thyroid hormone metabolism.
• Hemoglobin binds selenium via selenotrisulfide, affecting selenium transport and detoxification.
• Selenium nanoparticles alleviate renal ischemia/reperfusion injury by inhibiting ferritinophagy.
• Selenium sulfide exhibits redox activity relevant to its therapeutic and toxic effects.
• Mammalian selenium-containing proteins are critical for antioxidant defense and thyroid hormone activation.
• Selenium binding is a potential biomarker for cancer prognosis and renal injury.
• CRISPR-based models enable causal testing of selenium-binding protein functions in disease.
Molecular Mechanism of selenium binding
Selenium uptake and intracellular availability
In simple terms: Cells take up selenium from the environment, and its availability determines how much can bind to proteins.
Selenium is acquired from dietary sources as selenocysteine, selenomethionine, or inorganic selenite/selenate, and intracellular selenium pools are maintained by metabolic pathways. The binding of selenium to proteins such as SELENBP1 depends on the availability of free selenium or selenium-containing metabolites. In renal tubular epithelial cells, selenium availability influences ferroptosis sensitivity through GPX4 regulation.
Selenotrisulfide formation with hemoglobin
In simple terms: Selenium can chemically attach to hemoglobin through a special sulfur-selenium bond.
Human hemoglobin binds selenium via selenotrisulfide (S-Se-S) bonds, forming a stable complex that may serve as a selenium transport or detoxification mechanism. This covalent binding mode is distinct from non-covalent selenium binding by SELENBP1 and highlights the chemical versatility of selenium binding.
SELENBP1 as a selenium-binding protein
In simple terms: SELENBP1 is a protein that grabs selenium and helps control cellular stress responses.
SELENBP1 is the archetypal mammalian selenium-binding protein, though its exact binding affinity and stoichiometry remain under investigation. It is involved in redox regulation, cell proliferation, and apoptosis, and its expression is altered in multiple cancers. In renal tubular epithelial cells, SELENBP1 upregulates GPX4 to protect against ferroptosis.
Redox regulation and ferroptosis
In simple terms: Selenium binding helps cells manage oxidative stress and avoid a type of cell death called ferroptosis.
Selenium is a cofactor for glutathione peroxidase 4 (GPX4), which detoxifies lipid peroxides and prevents ferroptosis. SELENBP1-mediated selenium binding supports GPX4 expression, thereby inhibiting ferroptosis in renal tubular epithelial cells. Selenium nanoparticles also inhibit ferritinophagy via the XBP1/NCOA4 pathway, further linking selenium to redox and iron homeostasis.
Selenium sulfide redox chemistry
In simple terms: Selenium sulfide can participate in redox reactions that affect its biological activity.
Selenium sulfide exhibits redox activity that contributes to its therapeutic effects in dandruff and its potential toxicity. The redox riddle of selenium sulfide underscores how selenium speciation influences binding interactions and biological outcomes.
Key Genes Involved in GO:0008430 selenium binding
The following genes and proteins are directly implicated in selenium binding or selenium-dependent processes, based on verified literature.
| Gene | Major Role | Research Relevance |
|---|---|---|
| SELENBP1 | Binds selenium non-covalently; regulates redox and apoptosis | Implicated in cancer, renal injury, and ferroptosis |
| GPX4 | Selenium-dependent glutathione peroxidase; detoxifies lipid peroxides | Protects against ferroptosis; regulated by SELENBP1 |
| HBB | Hemoglobin beta chain; binds selenium via selenotrisulfide | Selenium transport and detoxification in blood |
| HBA1 | Hemoglobin alpha chain; binds selenium via selenotrisulfide | Selenium transport and detoxification in blood |
| XBP1 | Transcription factor regulating ER stress and ferritinophagy | Mediates selenium nanoparticle effects in renal ischemia/reperfusion |
| NCOA4 | Cargo receptor for ferritinophagy | Involved in selenium nanoparticle-mediated inhibition of ferritinophagy |
| DIO1 | Iodothyronine deiodinase; selenium-dependent | Thyroid hormone metabolism and autoimmune thyroid disease |
| DIO2 | Iodothyronine deiodinase; selenium-dependent | Thyroid hormone activation; linked to thyroid autoimmunity |
| TXNRD1 | Thioredoxin reductase; selenium-dependent | Redox regulation and antioxidant defense |
| TXNRD2 | Thioredoxin reductase; selenium-dependent | Mitochondrial redox regulation |
| SELENOP | Selenoprotein P; selenium transport | Selenium distribution and antioxidant defense |
| SELENOW | Selenoprotein W; antioxidant | Redox regulation in muscle and other tissues |
| SELENOK | Selenoprotein K; ER membrane protein | ER stress and calcium signaling |
| SELENOS | Selenoprotein S; ER stress regulation | Inflammation and ER homeostasis |
| SELENOF | Selenoprotein F; ER protein | Protein folding and redox |
| SELENOM | Selenoprotein M; ER protein | Neuroprotection and redox |
| SELENON | Selenoprotein N; ER protein | Muscle development and calcium homeostasis |
| SELENOI | Selenoprotein I; phospholipid synthesis | Membrane lipid metabolism |
How Is selenium binding Regulated?
Selenium binding and selenium-binding protein function are regulated at multiple levels. Selenium availability itself is a key regulator: dietary selenium intake influences SELENBP1 expression and selenoprotein synthesis. In renal tubular epithelial cells, SELENBP1 upregulates GPX4 to protect against ferroptosis, indicating that SELENBP1 levels are coupled to redox stress responses. The XBP1/NCOA4 pathway mediates selenium nanoparticle effects on ferritinophagy, linking ER stress signaling to selenium-dependent regulation. Additionally, thyroid autoimmunity is influenced by selenium status, suggesting that selenium binding and selenoprotein activity are regulated by nutritional and hormonal factors.
selenium binding and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| SELENBP1 | Non-small cell lung cancer; renal ferroptosis | KO and overexpression in cancer cell lines and renal tubular epithelial cells |
| GPX4 | Ferroptosis; renal injury | Knock-in of GPX4 mutants; KO in renal cells |
| XBP1 | Renal ischemia/reperfusion injury; ferritinophagy | KO and point mutation in renal epithelial cells |
| NCOA4 | Ferritinophagy; iron homeostasis | KO and tagged knock-in in renal cells |
| DIO1/DIO2 | Autoimmune thyroid disease | Overexpression and KO in thyroid cell lines |
Selenium binding in cancer
SELENBP1 expression is frequently altered in human cancers, and its downregulation is associated with malignant progression. In non-small cell lung cancer, SELENBP1 inhibits malignant progression and induces apoptosis via distinct mechanisms, suggesting a tumor-suppressive role. These findings position selenium binding as a potential target for cancer prognosis and therapy.
Selenium binding in renal injury and ferroptosis
SELENBP1 protects renal tubular epithelial cells from ferroptosis by upregulating glutathione peroxidase 4, a key selenium-dependent enzyme. Selenium nanoparticles alleviate renal ischemia/reperfusion injury by inhibiting ferritinophagy via the XBP1/NCOA4 pathway, further highlighting the therapeutic potential of modulating selenium binding.
Selenium binding in thyroid autoimmunity
Selenium status is a nutritional factor in autoimmune thyroid disease, and selenium-dependent deiodinases (DIO1, DIO2) regulate thyroid hormone metabolism. Adequate selenium binding and selenoprotein function are therefore important for thyroid homeostasis.
Selenium binding in redox and hemoglobin chemistry
Human hemoglobin binds selenium via selenotrisulfide bonds, which may affect selenium transport and detoxification. Selenium sulfide exhibits redox activity that underlies its therapeutic and toxic properties. These chemical modes of selenium binding expand the biological roles of selenium beyond selenoproteins.
From selenium binding-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does SELENBP1 loss promote tumor progression? | SELENBP1 knockout in non-small cell lung cancer cell lines |
| Does SELENBP1 protect against ferroptosis? | SELENBP1 knockout and overexpression in renal tubular epithelial cells |
| How does selenium binding affect GPX4 expression? | Point mutation of SELENBP1 selenium-binding residues; GPX4 reporter |
| What is the role of XBP1/NCOA4 in selenium nanoparticle effects? | XBP1 knockout and NCOA4 tagged knock-in in renal cells |
| Does hemoglobin selenotrisulfide formation affect selenium transport? | HBB/HBA1 knock-in with cysteine mutations |
| Can selenium binding be targeted in thyroid autoimmunity? | DIO1/DIO2 overexpression in thyroid cell lines |
How to Study the selenium binding Process
| Method | What It Measures | Typical Application |
|---|---|---|
| ICP-MS | Selenium concentration and isotope ratios | Quantifying selenium binding in protein fractions |
| Selenium-75 radiolabeling | Selenium incorporation into proteins | Identifying selenium-binding proteins |
| RNA-seq | Global gene expression changes | Assessing SELENBP1-dependent transcriptional programs |
| Proteomics | Protein abundance and modifications | Detecting selenoproteins and binding partners |
| Lipid peroxidation assay | Oxidative stress and ferroptosis | Evaluating SELENBP1 protection in renal cells |
| Fluorescence microscopy | Protein localization and selenium distribution | Visualizing selenium binding in cells |
| CRISPR knockout | Loss-of-function phenotypes | Testing causal roles of selenium-binding genes |
| CRISPR knock-in | Tagged or mutant protein expression | Studying selenium-binding domain function |
Proteomic and selenium-binding assays
Selenium binding can be studied using selenium-75 radiolabeling, inductively coupled plasma mass spectrometry (ICP-MS), and selenium-affinity chromatography. These methods identify selenium-binding proteins and quantify binding stoichiometry.
Transcriptomic and proteomic profiling
RNA-seq and quantitative proteomics reveal how selenium availability or SELENBP1 expression alters global gene expression, including GPX4 and other selenoproteins. Such profiling helps identify downstream pathways regulated by selenium binding.
Redox and ferroptosis assays
Lipid peroxidation assays, glutathione measurements, and ferroptosis inhibitors are used to assess the functional impact of selenium binding on redox homeostasis. These assays are critical for linking selenium binding to cell death pathways.
Imaging and localization
Fluorescence microscopy with tagged SELENBP1 or selenium-specific probes can visualize selenium binding and protein localization in cells and tissues. Such imaging helps determine whether selenium binding occurs in specific organelles or compartments.
How CRISPR Can Be Used to Study GO:0008430 selenium binding
Knockout
CRISPR knockout of SELENBP1, GPX4, or XBP1 enables loss-of-function studies to determine their causal roles in ferroptosis, cancer progression, and renal injury. Knockout models are essential for validating selenium-binding protein functions in vivo and in vitro.
Point Mutation
Point mutations in selenium-binding residues of SELENBP1 or hemoglobin can dissect the specific contribution of selenium binding versus other protein functions. Such models are valuable for structure-function studies of selenium binding.
Knock-in
Knock-in of tagged SELENBP1 or GPX4 allows affinity purification and live-cell imaging of selenium-binding complexes. Tagged knock-in models also facilitate proteomic identification of selenium-dependent interactors.
Overexpression
Overexpression of SELENBP1 or GPX4 can test sufficiency in protecting against ferroptosis or inhibiting tumor progression. Overexpression models are useful for gain-of-function studies in cancer and renal cells.
How EDITGENE Supports selenium binding Research
Researchers studying selenium binding-related genes often need to determine whether a candidate gene is causally involved in disease or redox regulation. CRISPR-based models provide the precision required to test these hypotheses, from complete knockout to subtle point mutations that preserve protein structure while abolishing selenium binding.
Contact EDITGENE today to design your custom CRISPR model for selenium binding research.
Related Products
| Product name | Cat.No. | Species | Gene ID | |
|---|---|---|---|---|
| SELENBP1 Knockout HEK293 Cell Line | EDJ-KQ2334 | Human | 8991 | Details Get a Quote |
| DIO2 Knockout HEK293 Cell Line | EDJ-KQ2747 | Human | 1734 | Details Get a Quote |
| DIO1 Knockout HEK293 Cell Line | EDJ-KQ4443 | Human | 1733 | Details Get a Quote |
| GPX3 Knockout HEK293 Cell Line | EDJ-KQ4787 | Human | 2878 | Details Get a Quote |
| SELENOP Knockout HEK293 Cell Line | EDJ-KQ5736 | Human | 6414 | Details Get a Quote |
| SELENOF Knockout HEK293 Cell Line | EDJ-KQ6575 | Human | 9403 | Details Get a Quote |
| RPH3A Knockout HEK293 Cell Line | EDJ-KQ7722 | Human | 22895 | Details Get a Quote |
| SELENOT Knockout HEK293 Cell Line | EDJ-KQ11201 | Human | 51714 | Details Get a Quote |
| SELENOP Knockout HCT 116 Cell Line | EDJ-KQ29126 | Human | 6414 | Details Get a Quote |
| SELENOP Knockout HeLa Cell Line | EDJ-KQ29127 | Human | 6414 | Details Get a Quote |
| SELENBP1 Knockout A-549 Cell Line | EDJ-KQ22736 | Human | 8991 | Details Get a Quote |
| SELENBP1 Knockout HeLa Cell Line | EDJ-KQ22737 | Human | 8991 | Details Get a Quote |
| DIO2 Knockout A-549 Cell Line | EDJ-KQ23633 | Human | 1734 | Details Get a Quote |
| DIO2 Knockout HeLa Cell Line | EDJ-KQ23634 | Human | 1734 | Details Get a Quote |
| GPX3 Knockout A-549 Cell Line | EDJ-KQ27548 | Human | 2878 | Details Get a Quote |
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Frequently Asked Questions About selenium binding
What is GO:0008430 selenium binding?
GO:0008430 is a Gene Ontology molecular function term defined as binding to a selenium (Se) ion.
What genes are involved in selenium binding?
Key genes include SELENBP1, GPX4, HBB, HBA1, XBP1, NCOA4, and various selenoproteins such as DIO1, DIO2, and TXNRD1.
How does selenium binding affect ferroptosis?
SELENBP1 binds selenium and upregulates GPX4, which detoxifies lipid peroxides and protects renal tubular epithelial cells from ferroptosis.
Is selenium binding involved in cancer?
Yes, SELENBP1 inhibits malignant progression and induces apoptosis in non-small cell lung cancer, suggesting a tumor-suppressive role.
What is the role of selenium binding in thyroid disease?
Selenium status influences autoimmune thyroid disease, and selenium-dependent deiodinases regulate thyroid hormone metabolism.
How does hemoglobin bind selenium?
Human hemoglobin binds selenium via selenotrisulfide (S-Se-S) bonds, forming a stable complex.
Can CRISPR be used to study selenium binding?
Yes, CRISPR knockout, point mutation, knock-in, and overexpression models are used to dissect selenium-binding protein functions.
What diseases are linked to selenium binding proteins?
Cancers, renal ischemia/reperfusion injury, ferroptosis-related diseases, and autoimmune thyroid disease.
What methods measure selenium binding?
ICP-MS, selenium-75 radiolabeling, proteomics, and fluorescence microscopy are commonly used.
What is the difference between selenium binding and selenocysteine incorporation?
Selenium binding refers to non-covalent or covalent binding of selenium ions, while selenocysteine incorporation is co-translational and covered by separate GO terms.
Conclusion
GO:0008430 selenium binding is a fundamental molecular function that connects selenium availability to redox homeostasis, ferroptosis, cancer progression, and thyroid autoimmunity. The archetypal selenium-binding protein SELENBP1, along with hemoglobin and selenoproteins, mediates diverse biological effects through selenium binding. CRISPR-based models, including knockout, point mutation, knock-in, and overexpression, are indispensable for causally testing the roles of selenium-binding genes in disease. EDITGENE provides comprehensive services to accelerate this research and uncover new therapeutic targets.
References
- 1. Elhodaky M et al.. 2018. Selenium-Binding Protein 1 in Human Health and Disease.. Int J Mol Sci 19(11) PMID: 30400135
- 2. Zhao W et al.. 2024. Selenium binding protein 1 protects renal tubular epithelial cells from ferroptosis by upregulating glutathione peroxidase 4.. Chem Biol Interact 393:110944 PMID: 38518851
- 3. Zhu Y et al.. 2023. Selenium-binding protein 1 inhibits malignant progression and induces apoptosis via distinct mechanisms in non-small cell lung cancer.. Cancer Med 12(16):17149-17170 PMID: 37606338
- 4. Rayman MP. 2019. Multiple nutritional factors and thyroid disease, with particular reference to autoimmune thyroid disease.. Proc Nutr Soc 78(1):34-44 PMID: 30208979
- 5. Behne D et al.. 2001. Mammalian selenium-containing proteins.. Annu Rev Nutr 21:453-73 PMID: 11375445
- 6. Zuo Z et al.. 2024. Selenium nanoparticles alleviate renal ischemia/reperfusion injury by inhibiting ferritinophagy via the XBP1/NCOA4 pathway.. Cell Commun Signal 22(1):376 PMID: 39061070
- 7. Tiganescu E et al.. 2023. The redox riddle of selenium sulfide.. Curr Opin Chem Biol 76:102365 PMID: 37463529
- 8. Haratake M et al.. 2005. Selenium binding to human hemoglobin via selenotrisulfide.. Biochim Biophys Acta 1723(1-3):215-20 PMID: 15780970
