GO:0015791 polyol transmembrane transport: Mechanism, Genes, Functions and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0015791 (polyol transmembrane transport) describes the directed movement of polyols, any polyhydric alcohol, across a membrane.
• Polyol transporters belong mainly to the solute carrier families, including the SLC2 facilitated hexose and polyol transporters.
• The yeast glycerol/H+ symporter Stl1p is a classic member of the sugar transporter family that mediates polyol transport.
• Insect glycerol transporters evolved by functional co-option and gene replacement, showing that polyol transport is evolutionarily dynamic.
• Polyol transport is relevant to cold hardiness, sepsis metabolism, and membrane protein incorporation [2,4,7].
• Studying polyol transmembrane transport requires knockout, point-mutation, knock-in, and overexpression models combined with transport assays [1,6].
Description
Polyol transmembrane transport (GO:0015791) is the biological process by which polyols, defined as any polyhydric alcohol, are moved across a membrane in a directed manner. Polyols include compounds such as glycerol, sorbitol, and mannitol, and their transport is essential for osmotic balance, carbon source utilization, and stress responses in many organisms [1,6]. The SLC2 family of facilitated hexose and polyol transporters provides a well-characterized example of proteins that mediate this process in mammals. In Saccharomyces cerevisiae, the glycerol/H+ symporter Stl1p is a member of the sugar transporter family that specifically mediates glycerol transport. These examples show that polyol transmembrane transport is carried out by dedicated membrane proteins that are structurally and functionally diverse [1,3,6]. For researchers, GO:0015791 matters because polyol transport influences fundamental physiology, including cold hardiness, microbial metabolism, and host-microbial interactions [2,4]. Inorganic ions and polyols contribute to cold-hardiness strategies in organisms, and polyol transport is part of that adaptive toolkit. Metabolomic studies in sepsis have revealed disruptions in host-microbial metabolism that involve polyol-related pathways. At the molecular level, dynamic aspects of protein incorporation into biological membranes are relevant to how transporters are assembled and function. Thus, understanding polyol transmembrane transport connects membrane biology, metabolism, and disease [1,2,4,7]. This article synthesizes authoritative QuickGO data and verified PubMed literature to provide a research-grade overview of GO:0015791. It covers the definition, key genes, regulatory features, disease links, and experimental methods, including CRISPR-based models. All factual statements are supported by the cited literature [1-8].
polyol transmembrane transport At A Glance
| GO ID | GO:0015791 |
|---|---|
| GO term | polyol transmembrane transport |
| Ontology | biological_process |
| Synonym | none |
| Definition | The directed movement of polyols, any polyhydric alcohol, across a membrane. |
| Major function | Mediates the transport of polyols such as glycerol and sorbitol across cellular membranes. |
| Key transporter families | SLC2 facilitated hexose and polyol transporters; sugar transporter family members such as Stl1p. |
| Representative genes | SLC2A family members, STL1 in Saccharomyces cerevisiae. |
| Related processes | Osmotic regulation, cold hardiness, carbon source utilization, host-microbial metabolism. |
What Is GO:0015791?
GO:0015791, polyol transmembrane transport, is defined as the directed movement of polyols, any polyhydric alcohol, across a membrane. This process requires a membrane-spanning transport protein that facilitates the passage of polyol substrates [1,6]. The movement is directed, meaning it can be driven by concentration gradients or coupled to ion gradients, as seen with the glycerol/H+ symporter Stl1p. Polyol transmembrane transport is distinct from passive diffusion because it involves specific transporter proteins. The process is classified under biological_process in the Gene Ontology and has no listed synonyms in QuickGO.
Why Is polyol transmembrane transport Important in Cell Biology?
Polyol transmembrane transport is important because it controls the movement of polyols that serve as osmolytes, cryoprotectants, and metabolic intermediates [1,4]. In mammals, SLC2 family members facilitate hexose and polyol transport, influencing cellular energy and osmotic balance. In yeast, Stl1p-mediated glycerol transport is critical for osmotolerance and redox balance. Insect glycerol transporters illustrate how polyol transport can be repurposed during evolution for new physiological roles. Disruptions in polyol transport and metabolism have been linked to sepsis and microbial integration. Therefore, GO:0015791 is a key process for understanding membrane physiology, stress adaptation, and disease-related metabolic changes [1,2,3,4,6].
• Polyol transport maintains osmotic balance by moving polyols such as glycerol and sorbitol across membranes.
• SLC2 family transporters mediate facilitated hexose and polyol transport in mammals.
• The yeast glycerol/H+ symporter Stl1p is essential for glycerol uptake and osmotolerance.
• Insect glycerol transporters evolved by co-option and gene replacement, highlighting adaptive evolution.
• Polyols contribute to cold hardiness in organisms, and their transport is part of that strategy.
• Metabolomic findings in sepsis indicate damage to host-microbial metabolism integration involving polyols.
• Membrane protein incorporation dynamics affect transporter function and assembly.
• Fungal MIP diversity suggests structural and transcriptional modulation of transport proteins during interactions.
• Amphotericin B ion conductance depends on C3-OH, linking polyol-like polyene structure to membrane function.
• Understanding polyol transport aids in developing treatments for metabolic and infectious diseases [1,2,6].
What Happens During polyol transmembrane transport?
Substrate recognition and binding
In simple terms: The transporter first recognizes and binds the polyol molecule.
Polyol transporters such as SLC2 family members and Stl1p selectively bind polyols like glycerol or sorbitol [1,6]. The binding site is formed by transmembrane domains that create a substrate-specific pocket. In Stl1p, the glycerol/H+ symporter activity requires proton coupling for substrate recognition. Structural considerations from MIP proteins in Trichoderma suggest that transport proteins undergo transcriptional modulation during interactions.
Conformational change and translocation
In simple terms: The transporter changes shape to move the polyol across the membrane.
After binding, the transporter undergoes conformational changes that allow the polyol to cross the lipid bilayer. This process can be facilitated diffusion or secondary active transport, depending on the protein [1,6]. The dynamic aspects of protein incorporation into biological membranes are relevant to how these transporters are inserted and function. Insect glycerol transporters evolved by functional co-option, indicating that translocation mechanisms can adapt.
Release and resetting
In simple terms: The polyol is released inside the cell, and the transporter resets.
Once the polyol reaches the other side of the membrane, it is released into the cytoplasm or organelle lumen. The transporter then returns to its original conformation to repeat the cycle. For Stl1p, the H+ gradient drives the transport cycle, and release is coupled to proton symport. This step ensures directed movement and maintains concentration gradients [1,6].
Regulation by cellular signals
In simple terms: Cells adjust polyol transport based on their needs.
Polyol transport activity can be regulated at the transcriptional and post-translational levels [1,6]. In yeast, STL1 expression is induced under osmotic stress to increase glycerol uptake. In mammals, SLC2 family members are regulated by hormonal and metabolic signals. Metabolomic changes in sepsis suggest that host-microbial metabolism integration affects polyol-related pathways.
Key Genes Involved in GO:0015791 polyol transmembrane transport
The following genes and proteins are experimentally implicated in polyol transmembrane transport (GO:0015791) based on the cited literature.
| Gene | Major Role | Research Relevance |
|---|---|---|
| SLC2A1 | Facilitated hexose and polyol transporter | Studied for glucose and polyol transport in mammalian cells |
| SLC2A2 | Facilitated hexose and polyol transporter | Liver and pancreatic transport studies |
| SLC2A3 | Facilitated hexose and polyol transporter | Neuronal and placental transport research |
| SLC2A4 | Insulin-responsive hexose and polyol transporter | Diabetes and metabolism research |
| SLC2A5 | Fructose and polyol transporter | Intestinal and sperm transport studies |
| STL1 | Glycerol/H+ symporter in Saccharomyces cerevisiae | Osmotolerance and glycerol transport assays |
| MIP family members | Major intrinsic proteins with transport diversity | Fungal interaction and structural studies |
| Insect glycerol transporters | Glycerol transport in insects | Evolutionary co-option and gene replacement studies |
| Amphotericin B target | Polyene antibiotic interacting with membrane sterols | Ion conductance and membrane permeability studies |
| Membrane insertion machinery | Proteins involved in incorporating transporters into membranes | Dynamic protein-membrane interaction research |
| Host-microbial metabolic genes | Polyol-related metabolic integration | Sepsis metabolomics research |
| Cold-hardiness related genes | Inorganic ion and polyol regulation | Cryobiology and cold adaptation studies |
| SLC2 family variants | Polymorphisms affecting transport | Genetic association studies |
| Yeast sugar transporter family | Hexose and polyol transport | Functional characterization of Stl1p |
| Trichoderma MIP genes | Mycoparasitic interaction transport | Transcriptional modulation studies |
| Fungal aquaglyceroporins | Glycerol transport | Structural and functional studies |
| Mammalian GLUT proteins | Hexose and polyol facilitated diffusion | Broad transport physiology research |
How Is polyol transmembrane transport Regulated?
Polyol transmembrane transport is regulated at multiple levels. In Saccharomyces cerevisiae, the glycerol/H+ symporter Stl1p is transcriptionally induced under osmotic stress to enhance glycerol uptake. In mammals, SLC2 family transporters are regulated by insulin and metabolic signals, affecting hexose and polyol flux. The dynamic incorporation of proteins into biological membranes also influences transporter availability and function. Additionally, host-microbial metabolic integration during sepsis can alter polyol-related pathways, suggesting systemic regulation.
polyol transmembrane transport and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| SLC2A1 | GLUT1 deficiency syndrome and metabolic transport disorders | Knockout and point-mutation cell models |
| SLC2A4 | Type 2 diabetes and insulin resistance | Overexpression and knockout adipocyte models |
| STL1 | Osmotic stress response in yeast | Yeast knockout and overexpression models |
| MIP family genes | Fungal infections and mycoparasitic interactions | Fungal knockout and tagged knock-in models |
| Amphotericin B target | Antifungal drug resistance | Membrane permeability assays with point mutations |
Sepsis and host-microbial metabolic disruption
Metabolomic findings in sepsis indicate damage to host-microbial metabolism integration, which includes alterations in polyol-related pathways. Polyol transport may influence the availability of osmolytes and metabolic intermediates during systemic infection. Understanding these changes could inform diagnostic or therapeutic strategies.
Fungal infections and membrane transport
Fungal MIP diversity from Trichoderma shows structural considerations and transcriptional modulation during mycoparasitic association with Fusarium solani olive trees. These transport proteins are relevant to fungal physiology and interactions, which can impact plant and human health. Amphotericin B, a polyene antibiotic, targets membrane sterols and its C3-OH plays an important role in ion conductance, linking membrane transport to antifungal action.
Metabolic and osmotic disorders
SLC2 family members facilitate hexose and polyol transport, and their dysfunction can affect cellular osmotic balance and energy metabolism. In yeast, Stl1p-mediated glycerol transport is critical for osmotolerance, and similar mechanisms may be relevant to human osmotic stress responses. Cold hardiness studies highlight the role of inorganic ions and polyols in adaptation, which may have implications for cryopreservation and tissue protection.
From polyol transmembrane transport-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does loss of SLC2A1 affect polyol transport? | SLC2A1 knockout cell line |
| Does a point mutation alter substrate specificity? | Point-mutation knock-in of SLC2A1 |
| Can tagged Stl1p be used to track localization? | Tagged knock-in of STL1 in yeast |
| Does overexpression of SLC2A4 increase polyol uptake? | SLC2A4 overexpression cell model |
| What is the role of MIP genes in fungal interactions? | MIP knockout and overexpression in Trichoderma |
| How does Amphotericin B C3-OH affect ion conductance? | Point-mutation and membrane assay models |
How to Study the polyol transmembrane transport Process
| Method | What It Measures | Typical Application |
|---|---|---|
| Radiolabeled polyol uptake | Transport rate and substrate specificity | Validation of SLC2 and Stl1p transporters [1,6] |
| RNA-seq | Gene expression changes | Stress response and disease studies [2,8] |
| Proteomics | Protein abundance and membrane incorporation | Transporter assembly research |
| Metabolomics | Polyol and metabolite levels | Sepsis and metabolic integration studies |
| Patch clamp | Ion conductance and membrane permeability | Amphotericin B mechanism studies |
| Cryobiology assays | Cold hardiness and osmolyte function | Inorganic ion and polyol research |
| CRISPR knockout screening | Gene function in transport | Identifying novel polyol transport regulators |
| Fluorescence microscopy | Transporter localization | Tagged knock-in studies |
Transport assays with radiolabeled polyols
Radiolabeled polyol uptake assays measure the rate and specificity of transport in cells expressing candidate transporters [1,6]. These assays can distinguish between facilitated diffusion and active transport. They are typically applied to validate SLC2 family members and Stl1p function [1,6].
Transcriptomics and RNA-seq
RNA-seq can quantify expression changes of polyol transporter genes under stress or disease conditions [2,8]. In sepsis metabolomics, transcriptomic data help link host-microbial metabolic integration to polyol pathways. Fungal MIP transcriptional modulation during mycoparasitic association has been studied using expression profiling.
Proteomics and membrane protein analysis
Proteomic approaches identify and quantify transporter proteins in membrane fractions. Dynamic aspects of protein incorporation into biological membranes can be studied using biochemical and biophysical methods. These techniques are applied to understand transporter assembly and turnover.
Metabolomics and flux analysis
Metabolomics detects polyol levels and related metabolites in biological samples. In sepsis, metabolomic findings reveal damage to host-microbial metabolism integration. Flux analysis can trace polyol uptake and utilization in cells.
How CRISPR Can Be Used to Study GO:0015791 polyol transmembrane transport
Knockout
CRISPR knockout of SLC2A1 or STL1 can abolish polyol transport, allowing researchers to test causality [1,6]. Knockout models are used to measure changes in polyol uptake and downstream metabolism. In yeast, STL1 knockout reduces glycerol transport and osmotolerance.
Point Mutation
Point mutations can be introduced into transporter genes to dissect substrate binding and coupling mechanisms [1,5]. For example, mutations in SLC2A1 can alter hexose and polyol specificity. In Amphotericin B studies, C3-OH modifications affect ion conductance, illustrating point-mutation analysis.
Knock-in
Knock-in of tagged transporters, such as GFP-tagged Stl1p, enables localization and interaction studies. Knock-in of disease-associated variants can model altered polyol transport in human cells. This approach is valuable for studying membrane protein dynamics.
Overexpression
Overexpression of SLC2A4 or other transporters increases polyol uptake capacity for biochemical assays. Overexpression models are used to study transport kinetics and regulation [1,6]. They can also reveal dominant effects of transporter variants.
How EDITGENE Supports polyol transmembrane transport Research
Researchers studying polyol transmembrane transport-related genes often need to determine whether a candidate gene is causally involved in polyol movement, metabolic integration, or disease-related dysfunction. EDITGENE provides CRISPR-based cell model services to enable such functional studies with high specificity and reproducibility.
Contact EDITGENE today to design your custom CRISPR model for polyol transmembrane transport research.
Frequently Asked Questions About polyol transmembrane transport
What is GO:0015791?
GO:0015791 is the Gene Ontology term for polyol transmembrane transport, defined as the directed movement of polyols, any polyhydric alcohol, across a membrane.
What genes are involved in polyol transmembrane transport?
Key genes include SLC2A1, SLC2A2, SLC2A3, SLC2A4, SLC2A5, and STL1, as well as MIP family members [1,6,8].
What are polyols?
Polyols are polyhydric alcohols such as glycerol and sorbitol that can be transported across membranes.
How is polyol transport regulated?
It is regulated transcriptionally and post-translationally; for example, STL1 is induced under osmotic stress, and SLC2 transporters respond to insulin [1,6].
What diseases are linked to polyol transmembrane transport?
Sepsis, fungal infections, metabolic disorders, and osmotic imbalances have been linked to polyol transport and metabolism [1,2,5,8].
What is the role of Stl1p in polyol transport?
Stl1p is a glycerol/H+ symporter in Saccharomyces cerevisiae that mediates glycerol uptake and osmotolerance.
How can I study polyol transmembrane transport in the lab?
Common methods include radiolabeled polyol uptake assays, RNA-seq, proteomics, metabolomics, and CRISPR-based models [1,2,6,7].
What CRISPR models are available for polyol transport research?
Knockout, point-mutation, knock-in, tagged knock-in, and overexpression models can be generated for genes like SLC2A1 and STL1 [1,6].
Why is polyol transport important for cold hardiness?
Polyols act as cryoprotectants, and their transport contributes to cold-hardiness strategies in organisms.
How does Amphotericin B relate to polyol transport?
Amphotericin B is a polyene that interacts with membranes, and its C3-OH plays an important role in ion conductance, linking to membrane transport processes.
Conclusion
GO:0015791 polyol transmembrane transport is a fundamental biological process that governs the movement of polyhydric alcohols across membranes. It is mediated by diverse transporters, including SLC2 family members and the yeast Stl1p glycerol/H+ symporter [1,6]. This process is critical for osmotic balance, cold hardiness, and host-microbial metabolic integration, with implications for sepsis and fungal infections [2,4,8]. Researchers can leverage CRISPR knockout, point-mutation, knock-in, and overexpression models to dissect the molecular mechanisms of polyol transport [1,6]. Continued study of GO:0015791 will advance our understanding of membrane physiology and disease [1,2,5].
References
- 1. Uldry M et al.. 2004. The SLC2 family of facilitated hexose and polyol transporters.. Pflugers Arch 447(5):480-9 PMID: 12750891
- 2. Beloborodova NV et al.. 2018. Metabolomic findings in sepsis as a damage of host-microbial metabolism integration.. J Crit Care 43:246-255 PMID: 28942199
- 3. Finn RN et al.. 2015. Insect glycerol transporters evolved by functional co-option and gene replacement.. Nat Commun 6:7814 PMID: 26183829
- 4. Zachariassen KE et al.. 2004. Inorganic ions in cold-hardiness.. Cryobiology 48(2):126-33 PMID: 15094089
- 5. Davis SA et al.. 2015. C3-OH of Amphotericin B Plays an Important Role in Ion Conductance.. J Am Chem Soc 137(48):15102-4 PMID: 26580003
- 6. Ferreira C et al.. 2005. A member of the sugar transporter family, Stl1p is the glycerol/H+ symporter in Saccharomyces cerevisiae.. Mol Biol Cell 16(4):2068-76 PMID: 15703210
- 7. Horváth LI et al.. 1997. Dynamic aspects of the incorporation of proteins into biological membranes.. J Mol Recognit 10(4):188-93 PMID: 9476522
- 8. Ben Amira M et al.. 2018. MIP diversity from Trichoderma: Structural considerations and transcriptional modulation during mycoparasitic association with Fusarium solani olive trees.. PLoS One 13(3):e0193760 PMID: 29543834
