GO:1903710 spermine transmembrane transport: Polyamine Transport Mechanism, Genes, Functions and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:1903710 (spermine transmembrane transport) is the biological process by which the polyamine spermine is moved across a membrane.
• Spermine transport is mediated by dedicated transporters and channels, including P5B-ATPases such as ATP13A2-5 and the vesicular polyamine transporter SLC18B1.
• Spermine can also block ionotropic glutamate receptors and calcium-permeable AMPA receptors, linking transport to synaptic signaling.
• Spermine transport is essential for mitochondrial function, polyamine homeostasis, and cellular stress responses.
• Dysregulated spermine transport is implicated in cancer, neurodegeneration, and mitochondrial disease.
• CRISPR knockout, point-mutation, knock-in, and overexpression models are key tools for dissecting spermine transporter function.
Description
GO:1903710, spermine transmembrane transport, is the biological process in which the polyamine spermine is transported across a membrane. Spermine is a polycationic molecule that participates in diverse cellular functions, including nucleic acid stabilization, ion channel modulation, and mitochondrial metabolism. Because spermine cannot freely diffuse across lipid bilayers, its distribution depends on specific transport systems that move it into and out of organelles and cells. Understanding this process is therefore central to polyamine biology and to the interpretation of experimental models that manipulate polyamine levels. Recent structural and functional studies have begun to define the molecular machinery responsible for spermine transmembrane transport, including P5B-ATPases and vesicular polyamine transporters. These findings have broad implications for cancer biology, neuroscience, and mitochondrial physiology. This article summarizes the authoritative GO definition, the known transport mechanisms, the genes involved, and the experimental approaches used to study spermine transmembrane transport.
spermine transmembrane transport At A Glance
| GO ID | GO:1903710 |
|---|---|
| GO term | spermine transmembrane transport |
| Ontology | biological_process |
| Synonym | none |
| Major function | Translocation of spermine across biological membranes |
| Cellular location | Plasma membrane, endosomal/lysosomal membranes, mitochondrial membranes |
| Representative transporters | ATP13A2-5 (P5B-ATPases), SLC18B1 (vesicular polyamine transporter) |
| Associated processes | Polyamine homeostasis, mitochondrial function, ion channel modulation |
| Disease relevance | Cancer, neurodegeneration, mitochondrial disorders |
What Is GO:1903710?
According to the Gene Ontology, GO:1903710 (spermine transmembrane transport) is defined as the process in which spermine is transported across a membrane. This definition encompasses the directed movement of spermine from one side of a lipid bilayer to the other, whether into or out of a cell or organelle, and includes both ATP-dependent and ATP-independent transport mechanisms.
Why Is spermine transmembrane transport Important in Cell Biology?
Spermine transmembrane transport is important because spermine regulates fundamental cellular processes such as nucleic acid stability, ion channel activity, and mitochondrial metabolism, and its concentration and localization are controlled by transport across membranes. Defects in spermine transport machinery have been linked to human disease, including neurodegenerative disorders and cancer, making this process a target for both mechanistic studies and therapeutic development.
• Controls intracellular and organellar spermine levels, which influence polyamine homeostasis.
• Regulates mitochondrial function and energy metabolism through spermine transport into mitochondria.
• Modulates ionotropic glutamate receptors and calcium-permeable AMPA receptors via spermine block.
• Is mediated by P5B-ATPases such as ATP13A2, which are linked to neurodegeneration.
• Involves the vesicular polyamine transporter SLC18B1, which affects synaptic and vesicular polyamine storage.
• Is relevant to cancer imaging and therapy, as spermine derivatives are used for tumor PET imaging.
• Provides a mechanism for polyamine compartmentalization in prokaryotes and eukaryotes.
• Can be studied using CRISPR models to dissect transporter-specific contributions.
What Happens During spermine transmembrane transport?
Recognition and binding of spermine by transporters
In simple terms: First, a transporter protein recognizes and grabs spermine on one side of the membrane.
Spermine transmembrane transport begins with the binding of spermine to a specific transporter or channel protein. Structural studies of P5B-ATPases have revealed how these proteins recognize polyamine substrates and initiate the transport cycle. The vesicular polyamine transporter SLC18B1 also binds spermine with high specificity to mediate its uptake into vesicles. This recognition step is critical for selectivity and is governed by the physicochemical properties of spermine as a polycation.
Conformational changes and translocation across the membrane
In simple terms: The transporter changes shape to move spermine through the membrane.
After binding, the transporter undergoes a series of conformational changes that move spermine across the lipid bilayer. For P5B-ATPases, ATP hydrolysis drives the transport cycle, coupling energy consumption to spermine translocation. The human vesicular polyamine transporter uses a similar alternating-access mechanism to shuttle spermine into vesicles. These structural transitions ensure that spermine is transported against its concentration gradient when required.
Release of spermine on the opposite side
In simple terms: Once across, the transporter releases spermine where it is needed.
The final step of spermine transmembrane transport is the release of spermine into the target compartment, such as the cytosol, mitochondrial matrix, or vesicular lumen. This release is coupled to the return of the transporter to its initial conformation, completing the cycle. In mitochondria, spermine transport and release influence organellar function and polyamine-dependent processes. Proper release is essential for maintaining spermine gradients and downstream signaling.
Regulation by cellular energy and ion gradients
In simple terms: The cell's energy status and ion gradients control how fast spermine is moved.
Spermine transmembrane transport is regulated by cellular energy levels and ion gradients. ATP-dependent transporters such as P5B-ATPases require ATP hydrolysis for activity, linking transport to metabolic state. Other transporters may use existing ion gradients to drive spermine movement. This regulation ensures that spermine distribution adapts to cellular demands and stress conditions.
Integration with polyamine homeostasis and signaling
In simple terms: Spermine transport is part of a larger system that keeps polyamine levels balanced.
Spermine transmembrane transport is integrated with polyamine biosynthesis, catabolism, and efflux to maintain cellular polyamine homeostasis. Transport into mitochondria and vesicles allows spermine to participate in compartment-specific functions, including modulation of ion channels and mitochondrial metabolism. Disruption of this integration can lead to altered polyamine distribution and disease.
Key Genes Involved in GO:1903710 spermine transmembrane transport
The following genes encode proteins that directly or indirectly participate in spermine transmembrane transport or its regulation.
| Gene | Major Role | Research Relevance |
|---|---|---|
| ATP13A2 | P5B-ATPase that transports polyamines including spermine | Linked to neurodegeneration; structural studies of transport mechanism |
| ATP13A3 | P5B-ATPase involved in polyamine transport | Potential role in polyamine homeostasis |
| ATP13A4 | P5B-ATPase family member | Candidate polyamine transporter |
| ATP13A5 | P5B-ATPase family member | Candidate polyamine transporter |
| SLC18B1 | Vesicular polyamine transporter | Mediates spermine uptake into vesicles; structural and functional studies |
| SLC25A | Mitochondrial carrier family | May contribute to mitochondrial spermine transport |
| GRIN1 | NMDA receptor subunit | Spermine modulates channel activity |
| GRIN2A | NMDA receptor subunit | Spermine block and modulation |
| GRIN2B | NMDA receptor subunit | Spermine block and modulation |
| GRIA1 | AMPA receptor subunit | Calcium-permeable AMPA receptors are blocked by spermine |
| GRIA2 | AMPA receptor subunit | Editing controls spermine sensitivity |
| KCNJ10 | Kir4.1 potassium channel | Spermine may influence channel block |
| KCNJ16 | Kir5.1 potassium channel | Heteromeric Kir4.1/5.1 channels and polyamine block |
| ODC1 | Ornithine decarboxylase | Polyamine biosynthesis, upstream of spermine |
| SAT1 | Spermidine/spermine N1-acetyltransferase | Polyamine catabolism, affects spermine levels |
| SMOX | Spermine oxidase | Degrades spermine, influencing transport demand |
| PAOX | Polyamine oxidase | Polyamine catabolism |
| AZIN1 | Antizyme inhibitor | Regulates polyamine synthesis and transport |
How Is spermine transmembrane transport Regulated?
Spermine transmembrane transport is regulated at multiple levels. ATP-dependent transporters such as P5B-ATPases require ATP hydrolysis, linking transport activity to cellular energy status. The vesicular polyamine transporter SLC18B1 uses a proton gradient to drive spermine uptake into vesicles, coupling transport to vesicular pH. Polyamine homeostasis itself regulates transport through feedback mechanisms involving antizyme and antizyme inhibitor. Additionally, spermine transport into mitochondria is influenced by mitochondrial membrane potential and ion gradients. These regulatory layers ensure that spermine is distributed appropriately in response to cellular needs and stress.
spermine transmembrane transport and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| ATP13A2 | Neurodegeneration (Kufor-Rakeb syndrome) | Knockout and point-mutation models in neurons |
| SLC18B1 | Vesicular polyamine storage and synaptic function | Knockout and tagged knock-in in neuronal cells |
| GRIN1/GRIN2A/GRIN2B | NMDA receptor modulation and excitotoxicity | Point-mutation and overexpression models |
| GRIA1/GRIA2 | Calcium-permeable AMPA receptor function | Knockout and point-mutation models |
| KCNJ10/KCNJ16 | Potassium channel block and inward rectification | Knockout and knock-in models |
Neurodegeneration and ATP13A2 dysfunction
Mutations in ATP13A2, a P5B-ATPase that transports polyamines including spermine, are associated with neurodegenerative disorders such as Kufor-Rakeb syndrome and early-onset parkinsonism. Structural and functional studies of P5B-ATPases have provided insights into how impaired spermine transport may contribute to neuronal dysfunction. The vesicular polyamine transporter SLC18B1 also plays a role in neuronal polyamine storage, and its dysfunction may affect synaptic function.
Cancer and polyamine transport
Altered polyamine transport is a hallmark of many cancers, and spermine derivatives are being developed for tumor imaging. The (68)Ga-labeled spermine derivative has been evaluated for PET imaging of tumors, highlighting the relevance of spermine transport to cancer diagnostics. Targeting spermine transport pathways may offer therapeutic opportunities in oncology.
Mitochondrial dysfunction and metabolic stress
Spermine transport into mitochondria is essential for mitochondrial function, and disruption of this process can lead to metabolic stress. Studies in rat heart mitochondria have shown that spermine transport and action are linked to mitochondrial respiration and ion homeostasis. Defects in mitochondrial spermine transport may contribute to mitochondrial diseases and metabolic disorders.
Neurological channelopathies and receptor modulation
Spermine acts as a modulator of ionotropic glutamate receptors, including NMDA and calcium-permeable AMPA receptors, and its transport affects the local concentration available for channel block. Dysregulation of spermine transport could therefore influence synaptic plasticity and excitotoxicity. Heteromeric Kir4.1/5.1 channels are also subject to polyamine block, linking spermine transport to potassium channel physiology.
From spermine transmembrane transport-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does loss of ATP13A2 impair spermine transport? | ATP13A2 knockout cell line |
| How does SLC18B1 mediate vesicular spermine uptake? | SLC18B1 knockout and tagged knock-in |
| What is the effect of a disease-associated point mutation in ATP13A2? | Point-mutation knock-in |
| Can overexpression of a transporter increase spermine uptake? | Overexpression cell model |
| How does spermine transport affect AMPA receptor function? | GRIA1/GRIA2 knockout or point-mutation neurons |
| Does spermine transport regulate mitochondrial function? | Mitochondria-targeted knockout or overexpression |
How to Study the spermine transmembrane transport Process
| Method | What It Measures | Typical Application |
|---|---|---|
| Radiolabeled spermine uptake | Transport rate and accumulation | Quantify transport in KO/overexpression cells |
| Cryo-EM | Protein structure and conformational states | Determine transport mechanism |
| Electrophysiology | Ion channel currents and block | Study spermine modulation of receptors |
| PET imaging | In vivo tracer uptake | Tumor imaging with spermine derivatives |
| Mitochondrial respiration assays | Mitochondrial function | Assess spermine transport in mitochondria |
| Polyamine quantification (LC-MS) | Cellular polyamine levels | Measure homeostasis after transport manipulation |
| CRISPR knockout screening | Gene essentiality and transport phenotypes | Identify novel transport regulators |
Radiolabeled spermine transport assays
Radiolabeled spermine uptake assays are used to measure transport activity directly in cells and isolated organelles. These assays quantify the rate of spermine accumulation and can be applied to knockout or overexpression models to determine the contribution of specific transporters.
Structural biology (cryo-EM and X-ray crystallography)
Cryo-EM and X-ray crystallography have been used to determine the structures of P5B-ATPases and the vesicular polyamine transporter, revealing the molecular basis of spermine recognition and translocation. These methods provide mechanistic insights that guide functional experiments.
Electrophysiology and channel block assays
Electrophysiology is used to study the effects of spermine on ion channels, including NMDA receptors, calcium-permeable AMPA receptors, and Kir4.1/5.1 channels. These assays measure spermine block and modulation, linking transport to channel function.
PET imaging with spermine derivatives
PET imaging using (68)Ga-labeled spermine derivatives allows non-invasive visualization of spermine transport in tumors. This approach is valuable for cancer diagnosis and for evaluating the efficacy of therapies targeting polyamine transport.
How CRISPR Can Be Used to Study GO:1903710 spermine transmembrane transport
Knockout
CRISPR knockout of genes such as ATP13A2 or SLC18B1 is used to abolish specific spermine transport activities and assess the consequences for polyamine homeostasis and cellular function. Knockout models help determine whether a candidate transporter is required for spermine uptake or release.
Point Mutation
Point-mutation knock-in models are used to introduce disease-associated mutations, such as those found in ATP13A2, to study their effects on spermine transport and cellular phenotypes. These models provide insight into the molecular basis of transport dysfunction.
Knock-in
Knock-in of tagged transporters, such as fluorescently labeled SLC18B1, allows visualization and biochemical isolation of transport complexes. Tagged knock-in models are valuable for tracking transporter localization and dynamics.
Overexpression
Overexpression of spermine transporters is used to enhance transport activity and study downstream effects on polyamine levels, ion channel modulation, and mitochondrial function. Overexpression models can also be used to test the specificity of transport inhibitors.
How EDITGENE Supports spermine transmembrane transport Research
Researchers studying spermine transmembrane transport-related genes often need to determine whether a candidate gene is causally involved in spermine uptake, release, or downstream signaling. EDITGENE provides a comprehensive suite of CRISPR-based services to generate precisely engineered cell models for such studies.
Contact EDITGENE today to design your custom CRISPR model for spermine transmembrane transport research.
Frequently Asked Questions About spermine transmembrane transport
What is spermine transmembrane transport?
Spermine transmembrane transport (GO:1903710) is the process in which spermine is transported across a membrane.
What genes are involved in spermine transmembrane transport?
Key genes include ATP13A2-5 (P5B-ATPases) and SLC18B1 (vesicular polyamine transporter), as well as polyamine metabolic genes.
How is spermine transported across membranes?
Spermine is transported by dedicated transporters such as P5B-ATPases and SLC18B1, which use ATP or ion gradients to move spermine across membranes.
What is the role of ATP13A2 in spermine transport?
ATP13A2 is a P5B-ATPase that transports polyamines including spermine, and its dysfunction is linked to neurodegeneration.
What is SLC18B1?
SLC18B1 is the vesicular polyamine transporter that mediates spermine uptake into vesicles.
How does spermine affect ion channels?
Spermine blocks ionotropic glutamate receptors and calcium-permeable AMPA receptors, modulating synaptic signaling.
Is spermine transport important in mitochondria?
Yes, spermine transport into mitochondria is essential for mitochondrial function and polyamine homeostasis.
What diseases are associated with defective spermine transport?
Defective spermine transport has been linked to neurodegeneration, cancer, and mitochondrial disorders.
How can I study spermine transmembrane transport?
You can use radiolabeled uptake assays, cryo-EM, electrophysiology, PET imaging, and CRISPR models.
What CRISPR models are available for spermine transport research?
EDITGENE offers knockout, point-mutation, knock-in, tagged knock-in, and overexpression models for genes involved in spermine transport.
Conclusion
GO:1903710 (spermine transmembrane transport) is a fundamental biological process that controls the distribution of spermine across cellular membranes. Recent structural and functional studies have identified key transporters, including P5B-ATPases and SLC18B1, and linked spermine transport to neurodegeneration, cancer, and mitochondrial function. Continued research using CRISPR models and advanced imaging will further elucidate the mechanisms and therapeutic potential of targeting spermine transport.
References
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- 3. Ning Y et al.. 2026. Cryo-EM structures of heteromeric Kir4.1/5.1 channel suggest mechanisms of inward rectification and channel blockage.. Nat Commun 17(1) PMID: 42248902
- 4. Qin K et al.. 2024. Synthesis and evaluation of a (68)Ga-labeled spermine derivative for tumor PET imaging.. Nucl Med Biol 134-135:108915 PMID: 38723361
- 5. Toninello A et al.. 1990. Transport and action of spermine in rat heart mitochondria.. Cardioscience 1(4):287-94 PMID: 2104195
- 6. Igarashi K et al.. 2010. Characteristics of cellular polyamine transport in prokaryotes and eukaryotes.. Plant Physiol Biochem 48(7):506-12 PMID: 20159658
- 7. Bowie D. 2018. Polyamine-mediated channel block of ionotropic glutamate receptors and its regulation by auxiliary proteins.. J Biol Chem 293(48):18789-18802 PMID: 30333231
- 8. Coombs I et al.. 2023. Enhanced functional detection of synaptic calcium-permeable AMPA receptors using intracellular NASPM.. Elife 12 PMID: 37042655
