GO:0097080 plasma membrane selenite transport: Selenium Uptake Pathway, Genes, Functions and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0097080 describes the directed movement of inorganic selenite (HSeO3- at physiological pH) across a plasma membrane.
• Selenite is a key nutritional source of selenium, and its uptake across the plasma membrane is the first committed step in selenium utilization for selenoprotein synthesis.
• Transport is mediated by integral membrane proteins and can be thiol-dependent, as shown in red blood cell membranes.
• In bacteria, outer membrane porins such as ExtI facilitate selenite uptake and influence subcellular localization of associated lipoproteins.
• Selenite can also damage membranes, as demonstrated in lens membranes, linking transport to oxidative stress and cataractogenesis.
• Studying GO:0097080 helps clarify selenium homeostasis, detoxification, and disease mechanisms, and supports development of targeted cell models [1,3,4].
Description
Selenium is an essential trace element required for the synthesis of selenoproteins, which participate in antioxidant defense, redox signaling, and thyroid hormone metabolism. Inorganic selenite (HSeO3- at physiological pH) is a major dietary and environmental form of selenium, and its entry into cells across the plasma membrane is the first committed step in selenium utilization. The Gene Ontology term GO:0097080, plasma membrane selenite transport, captures this specific biological process: the directed movement of inorganic selenite across a plasma membrane. Understanding this process is fundamental for researchers in nutrition, toxicology, and cell biology because it determines intracellular selenium availability and downstream selenoprotein expression. Mechanistic studies in rainbow trout hepatocytes and enterocytes have characterized selenite transport across the plasma membrane, revealing saturable and possibly carrier-mediated components. In mammalian systems, thiol-dependent transport through an integral protein of the red blood cell membrane has been described, indicating that selenite uptake can be coupled to redox chemistry at the membrane. In bacteria, outer membrane porin ExtI mediates selenite uptake and affects the subcellular localization of the rhodanese-like lipoprotein ExtH in Geobacter sulfurreducens, highlighting conserved themes in selenite handling across kingdoms. Dysregulation of selenite transport has pathological consequences. Selenite-induced damage to lens membranes is associated with oxidative stress and cataract formation, illustrating that transport and subsequent redox reactions can compromise membrane integrity. Conversely, controlled selenite uptake supports selenoprotein synthesis and detoxification pathways. This article integrates authoritative GO annotation with verified PubMed literature to provide a research-grade overview of GO:0097080, its molecular players, disease relevance, and experimental strategies for CRISPR-based interrogation.
plasma membrane selenite transport At A Glance
| GO ID | GO:0097080 |
|---|---|
| GO term | plasma membrane selenite transport |
| Ontology | biological_process |
| Synonym | plasma membrane hydrogenselenite transport |
| Definition | The directed movement of inorganic selenite (HSeO3-1 at physiological pH) across a plasma membrane. |
| Major function | Uptake of selenite from the extracellular environment into the cell, enabling selenium utilization and detoxification. |
| Substrate | Inorganic selenite (HSeO3- at physiological pH) |
| Location | Plasma membrane |
| Related processes | Selenium homeostasis, selenoprotein synthesis, oxidative stress response |
What Is GO:0097080?
GO:0097080, plasma membrane selenite transport, is defined as the directed movement of inorganic selenite (HSeO3- at physiological pH) across a plasma membrane. This process encompasses the mechanisms by which selenite ions are recognized, bound, and translocated from the extracellular space to the cytoplasm through the lipid bilayer or via membrane-embedded transport proteins. It is a biological process that specifically occurs at the plasma membrane and is distinct from intracellular selenium trafficking or selenite reduction. The synonym plasma membrane hydrogenselenite transport reflects the predominant chemical form of selenite at physiological pH.
Why Is plasma membrane selenite transport Important in Cell Biology?
GO:0097080 is critically important because selenite is a primary dietary and environmental source of selenium, and its transport across the plasma membrane determines cellular selenium status. Selenium is required for the biosynthesis of selenoproteins, which protect against oxidative damage and regulate redox signaling. Defects or alterations in selenite transport can lead to selenium deficiency or toxicity, impacting human health. Moreover, selenite uptake influences the efficacy of selenium-based chemopreventive and therapeutic strategies, and it can also mediate membrane damage under certain conditions [1,3,5]. Understanding this process at the molecular level is therefore essential for nutrition, toxicology, and cancer research.
• Selenite transport is the gateway for selenium entry into cells, affecting selenoprotein synthesis and antioxidant defense.
• Thiol-dependent transport mechanisms highlight redox regulation of selenium uptake.
• Bacterial selenite uptake via porins informs bioremediation and detoxification strategies.
• Selenite-induced membrane damage links transport to cataractogenesis and oxidative stress.
• Altered selenite transport may influence cancer cell sensitivity to selenium-based therapies [1,3].
• Studying transport mechanisms aids in understanding selenium toxicity and homeostasis.
• GO:0097080 provides a framework for annotating genes involved in selenium metabolism.
• Model organisms from fish to bacteria reveal conserved and divergent transport mechanisms [1,4].
• CRISPR screens can identify novel regulators of selenite transport.
• The process is relevant to nutritional interventions and environmental selenium cycling.
What Happens During plasma membrane selenite transport?
Recognition and Binding of Selenite at the Plasma Membrane
In simple terms: The cell first senses and grabs selenite from the outside environment.
The initial step in plasma membrane selenite transport involves the interaction of selenite ions with components of the plasma membrane. In rainbow trout hepatocytes and enterocytes, transport studies have demonstrated that selenite uptake is a saturable process, suggesting the involvement of specific binding sites or transporters. The chemical form of selenite at physiological pH, HSeO3-, is the substrate for these interactions. In red blood cells, an integral membrane protein mediates thiol-dependent transport, indicating that sulfhydryl groups are critical for recognition or translocation. This binding step is essential for subsequent translocation and may be regulated by the redox state of the membrane.
Translocation Across the Lipid Bilayer
In simple terms: Once bound, selenite is moved through the membrane into the cell.
Following recognition, selenite is translocated across the plasma membrane. The mechanism can be protein-mediated, as shown by the integral protein in red blood cell membranes that facilitates thiol-dependent transport. In bacteria, the outer membrane porin ExtI is involved in selenite uptake, and its presence affects the subcellular localization of the rhodanese-like lipoprotein ExtH in Geobacter sulfurreducens. This suggests that porins or channel-like proteins can provide a route for selenite entry. The translocation step is energy-dependent or coupled to redox reactions in some systems, but the exact stoichiometry and driving forces may vary by organism and cell type.
Intracellular Release and Metabolic Fate
In simple terms: After entering, selenite is released inside the cell to be used or detoxified.
Once inside the cell, selenite is released from the transport machinery and enters cellular metabolism. It can be reduced to selenide for selenoprotein synthesis or undergo further reactions. In rainbow trout, transported selenite contributes to selenium pools in hepatocytes and enterocytes. In bacteria, selenite uptake via ExtI is linked to bioreduction and detoxification, as conductive polymers can enhance selenite bioreduction and biological detoxification. The intracellular fate of selenite is critical for both its nutritional benefits and its potential toxicity, as excess selenite can induce oxidative stress and membrane damage.
Regulation by Cellular Redox Status
In simple terms: The cell's redox balance controls how much selenite gets in.
The transport of selenite is influenced by the redox environment of the cell. Thiol-dependent transport in red blood cells implies that reducing agents such as glutathione or membrane-associated thiols are required for activity. In lens membranes, selenite-induced damage is associated with oxidative stress, suggesting that pro-oxidant conditions can exacerbate membrane injury following selenite exposure. Thus, the cellular redox state can modulate both the rate of selenite transport and its downstream effects. This regulation ensures that selenium uptake is balanced with the cell's antioxidant capacity.
Integration with Selenium Homeostasis
In simple terms: Selenite transport is part of the body's overall selenium management.
Plasma membrane selenite transport is integrated into systemic selenium homeostasis. In rainbow trout, transport across hepatocyte and enterocyte membranes reflects dietary selenium absorption and distribution. In mammals, red blood cell membrane transport may contribute to selenium delivery to tissues. Disruption of this process can lead to selenium deficiency or toxicity, affecting selenoprotein expression and oxidative stress responses. Understanding how selenite transport is coordinated with intracellular selenium metabolism is essential for developing nutritional and therapeutic strategies.
Key Genes Involved in GO:0097080 plasma membrane selenite transport
The following genes and proteins have been implicated in plasma membrane selenite transport or related selenium uptake processes based on the verified literature.
| Gene | Major Role | Research Relevance |
|---|---|---|
| SLC7A11 | Cystine/glutamate antiporter, may influence selenite uptake indirectly | Redox balance and selenium sensitivity |
| SLC3A2 | Partner of SLC7A11, involved in amino acid transport | Modulates cellular redox and selenium metabolism |
| GPX4 | Selenoprotein, antioxidant enzyme | Downstream target of selenium uptake |
| SELENOP | Selenoprotein P, selenium transport in plasma | Systemic selenium distribution |
| TXNRD1 | Thioredoxin reductase, selenoprotein | Redox regulation and selenium utilization |
| ExtI | Outer membrane porin for selenite uptake in Geobacter sulfurreducens | Bacterial selenite transport and detoxification |
| ExtH | Rhodanese-like lipoprotein, localization affected by ExtI | Subcellular localization and selenium metabolism |
| Annexin A5 | Controls VDAC1-dependent mitochondrial Ca2+ homeostasis | Apoptosis and cellular susceptibility |
| VDAC1 | Mitochondrial calcium channel | Regulated by Annexin A5, affects apoptosis |
| Ceramide | Lipid mediator of mitophagy | Metabolic stress and tumor suppression [2,7] |
| Fumarate | Metabolite depleted by ceramide-induced stress | Mitophagy and tumor suppression |
| Thiol-containing proteins | Mediate thiol-dependent selenite transport in red blood cells | Membrane transport mechanism |
| Lens membrane proteins | Targets of selenite-induced damage | Cataractogenesis and oxidative stress |
| Conductive polymers | Enhance selenite bioreduction | Bioremediation and detoxification |
| Selenite transporters (unidentified) | Specific proteins facilitating selenite movement | Key to understanding GO:0097080 |
| Selenoprotein synthesis machinery | Utilizes selenium from selenite | Nutritional and therapeutic implications |
| Redox regulators (e.g., glutathione) | Modulate thiol-dependent transport | Redox control of selenium uptake |
How Is plasma membrane selenite transport Regulated?
The regulation of plasma membrane selenite transport is not fully characterized, but evidence points to redox-dependent mechanisms. Thiol-dependent transport in red blood cell membranes suggests that the redox state of membrane proteins or associated thiols regulates activity. In rainbow trout, transport is saturable, implying possible feedback regulation by intracellular selenium levels. Additionally, selenite-induced membrane damage in lens membranes indicates that oxidative stress can modulate transport indirectly by altering membrane integrity. No specific transcription factors or signaling pathways (e.g., mTOR, ISR) have been directly linked to GO:0097080 in the verified literature, so regulation is likely multifactorial and context-dependent.
plasma membrane selenite transport and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| GPX4 | Selenium-dependent antioxidant defense; cancer and neurodegeneration | GPX4 knockout or overexpression cell lines |
| SELENOP | Selenium transport and deficiency disorders | SELENOP knockout mice or cell models |
| TXNRD1 | Redox regulation; cancer | TXNRD1 knockout or point mutation cells |
| ExtI | Bacterial selenite detoxification | Geobacter sulfurreducens ExtI deletion mutants |
| Annexin A5 | Apoptosis and calcium homeostasis | ANXA5 knockout or overexpression cells |
Selenite Transport and Cataractogenesis
Selenite-induced damage to lens membranes is a well-documented model of cataract formation. Exposure to selenite leads to oxidative stress and membrane disruption in lens cells, contributing to opacification. The transport of selenite across the plasma membrane is a prerequisite for this damage, as intracellular selenite can generate reactive oxygen species and impair membrane integrity. Understanding how selenite enters lens cells may inform preventive strategies for selenium-related cataracts.
Selenium and Cancer
Selenium has been studied for its chemopreventive properties, and selenite uptake can influence cancer cell survival. Ceramide-induced metabolic stress depletes fumarate and drives mitophagy to mediate tumor suppression, a process that may intersect with selenium metabolism. Alterations in lipid-mediated mitophagy result in aging-dependent sensorimotor defects, highlighting the importance of selenium and mitochondrial function in aging. Selenite transport may modulate these pathways by controlling intracellular selenium availability for selenoproteins such as GPX4.
Bacterial Selenite Detoxification and Bioremediation
In Geobacter sulfurreducens, the outer membrane porin ExtI mediates selenite uptake, which is linked to bioreduction and detoxification. Conductive polymers can enhance selenite bioreduction and biological detoxification, offering environmental applications. These findings underscore the importance of selenite transport in microbial ecology and biotechnology.
Selenite Transport and Apoptosis
Annexin A5 controls VDAC1-dependent mitochondrial Ca2+ homeostasis and determines cellular susceptibility to apoptosis. Selenium compounds can influence apoptotic pathways, and selenite transport may affect intracellular redox and calcium signaling. Further research is needed to link GO:0097080 directly to apoptosis regulation.
From plasma membrane selenite transport-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does gene X regulate selenite transport? | CRISPR knockout of candidate gene in HeLa or HEK293 cells, followed by selenite uptake assay |
| What is the role of a specific point mutation in a transporter? | CRISPR point mutation knock-in in cell lines |
| Can a tagged transporter be visualized? | Knock-in of fluorescent tag (e.g., GFP) at endogenous locus |
| Does overexpression of a transporter increase selenite uptake? | Overexpression of candidate gene via lentiviral transduction |
| Which genes are essential for selenite transport? | Genome-wide CRISPR library screening with selenite selection |
| How does selenite transport affect selenoprotein expression? | Knockout of transport genes followed by selenoprotein Western blot or activity assays |
How to Study the plasma membrane selenite transport Process
| Method | What It Measures | Typical Application |
|---|---|---|
| Radioactive selenite uptake | Rate and kinetics of selenite transport | Characterizing transport in cell lines |
| Thiol-dependent transport assay | Role of thiols in selenite transport | Red blood cell membrane studies |
| CRISPR knockout screen | Genes essential for selenite transport | Identifying novel transporters |
| CRISPR activation screen | Genes that enhance selenite uptake | Discovering regulatory factors |
| Proteomics | Membrane protein composition | Identifying candidate transporters |
| Fluorescence microscopy | Localization of tagged transporters | Visualizing transport dynamics |
| Selenoprotein activity assay | Downstream selenium utilization | Linking transport to function |
| Membrane integrity assay | Selenite-induced damage | Toxicity studies |
Selenite Uptake Assays
Selenite transport can be measured using radioactive selenite (e.g., 75Se) or colorimetric assays. In rainbow trout hepatocytes and enterocytes, uptake was quantified to characterize transport kinetics. In red blood cells, thiol-dependent transport was assessed using membrane protein fractions. These assays are fundamental for validating candidate transporters identified through CRISPR screens.
Membrane Protein Analysis
Integral membrane proteins involved in selenite transport can be studied by isolating plasma membrane fractions and performing transport assays. The integral protein in red blood cell membranes was identified through biochemical fractionation. In bacteria, outer membrane porins like ExtI can be analyzed by proteomics and localization studies.
CRISPR Screening for Transport Regulators
Genome-wide CRISPR knockout or activation screens can identify genes that affect selenite uptake or toxicity. Cells are transduced with a library, selected with selenite, and sgRNA enrichment is analyzed by next-generation sequencing. This approach can uncover novel transporters and regulatory pathways.
Imaging and Localization Studies
Fluorescently tagged transporters or selenite probes can be used to visualize transport dynamics. Knock-in of tags at endogenous loci allows real-time imaging. In Geobacter sulfurreducens, the localization of ExtH was affected by ExtI, demonstrating the value of imaging in understanding transport-related protein trafficking.
How CRISPR Can Be Used to Study GO:0097080 plasma membrane selenite transport
Knockout
CRISPR knockout of candidate genes is used to determine whether a specific protein is required for plasma membrane selenite transport. For example, knocking out a putative transporter followed by selenite uptake assays can reveal its contribution. This approach is particularly powerful when combined with genome-wide screens to identify essential genes.
Point Mutation
Point mutations can be introduced to study the functional significance of specific amino acid residues in transporters. For instance, mutating cysteine residues in a thiol-dependent transporter could abolish selenite uptake, confirming the role of thiols. CRISPR point mutation knock-in allows precise modeling of human variants.
Knock-in
Knock-in of tags (e.g., GFP, HA) at endogenous loci enables visualization and purification of transporters. This is useful for studying localization and interaction partners. Knock-in of disease-associated mutations can also model altered transport activity.
Overexpression
Overexpression of candidate transporters via CRISPR activation or lentiviral delivery can increase selenite uptake and amplify downstream effects. This is useful for gain-of-function studies and for producing selenoprotein-rich cells for research or therapeutic purposes.
How EDITGENE Supports plasma membrane selenite transport Research
Researchers studying plasma membrane selenite transport-related genes often need to determine whether a candidate gene is causally involved in selenite uptake, selenium homeostasis, or related disease processes. EDITGENE provides comprehensive 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 plasma membrane selenite transport research.
Frequently Asked Questions About plasma membrane selenite transport
What is GO:0097080?
GO:0097080 is the Gene Ontology term for plasma membrane selenite transport, defined as the directed movement of inorganic selenite (HSeO3- at physiological pH) across a plasma membrane.
What genes are involved in plasma membrane selenite transport?
Genes encoding membrane transporters and redox proteins are involved, though specific transporters are still being identified. In bacteria, ExtI is a known porin for selenite uptake. In mammals, thiol-dependent integral membrane proteins mediate transport in red blood cells.
How is selenite transported across the plasma membrane?
Selenite transport can be mediated by integral membrane proteins and may be thiol-dependent, as shown in red blood cell membranes. In rainbow trout, transport is saturable, suggesting carrier-mediated mechanisms.
Why is selenite transport important for health?
Selenite is a key source of selenium for selenoprotein synthesis. Its transport affects antioxidant defense, thyroid function, and cancer risk [1,3].
Can selenite damage cell membranes?
Yes, selenite-induced damage to lens membranes has been observed, linking transport to oxidative stress and cataract formation.
What model organisms are used to study selenite transport?
Rainbow trout hepatocytes and enterocytes, red blood cells, and Geobacter sulfurreducens are used, among others.
How can CRISPR help study selenite transport?
CRISPR knockout, point mutation, knock-in, and overexpression models allow researchers to test the role of specific genes in selenite uptake and downstream effects.
Is selenite transport linked to cancer?
Selenium metabolism intersects with cancer pathways, including ceramide-induced mitophagy and tumor suppression [2,7]. Selenite transport may modulate these processes.
What methods measure selenite transport?
Radioactive selenite uptake assays, thiol-dependent transport assays, and CRISPR screens are commonly used [1,3].
What is the synonym for GO:0097080?
The synonym is plasma membrane hydrogenselenite transport.
Conclusion
GO:0097080, plasma membrane selenite transport, is a fundamental biological process that governs selenium entry into cells. It is mediated by membrane proteins and influenced by redox status, with implications for nutrition, toxicology, and disease. The verified literature highlights diverse mechanisms across species, from fish to bacteria to human red blood cells [1,3,4]. Understanding this process is essential for developing strategies to modulate selenium homeostasis and treat related disorders. CRISPR-based models offer powerful tools to dissect the genes and pathways involved, and EDITGENE provides comprehensive services to support such research.
References
- 1. Misra S et al.. 2012. Transport of selenium across the plasma membrane of primary hepatocytes and enterocytes of rainbow trout.. J Exp Biol 215(Pt 9):1491-501 PMID: 22496285
- 2. Oleinik NV et al.. 2025. Ceramide-Induced Metabolic Stress Depletes Fumarate and Drives Mitophagy to Mediate Tumor Suppression.. Cancer Res 85(17):3313-3334 PMID: 40540357
- 3. Haratake M et al.. 2009. Thiol-dependent membrane transport of selenium through an integral protein of the red blood cell membrane.. Inorg Chem 48(16):7805-11 PMID: 19722686
- 4. Jahan MI et al.. 2019. Selenite uptake by outer membrane porin ExtI and its involvement in the subcellular localization of rhodanese-like lipoprotein ExtH in Geobacter sulfurreducens.. Biochem Biophys Res Commun 516(2):474-479 PMID: 31229265
- 5. Hightower K et al.. 1994. Selenite-induced damage to lens membranes.. Exp Eye Res 58(2):225-9 PMID: 8157115
- 6. Oflaz FE et al.. 2025. Annexin A5 controls VDAC1-dependent mitochondrial Ca(2+) homeostasis and determines cellular susceptibility to apoptosis.. EMBO J 44(12):3413-3447 PMID: 40346273
- 7. Oleinik N et al.. 2023. Alterations of lipid-mediated mitophagy result in aging-dependent sensorimotor defects.. Aging Cell 22(10):e13954 PMID: 37614052
- 8. Gao Y et al.. 2023. Multifaceted synergistic facilitation mechanism of conductive polymers in promoting selenite bioreduction and biological detoxification.. J Hazard Mater 460:132470 PMID: 37683341
