GO:0061459 L-arginine transmembrane transporter activity: Mechanism, Genes and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0061459 L-arginine transmembrane transporter activity is a molecular function that enables the transfer of L-arginine across a membrane.
• L-arginine transport is coupled to nutrient sensing, especially mTORC1 signaling through SLC38A9 and TM4SF5.
• SLC7A1-mediated arginine uptake supports tumor growth and represents a therapeutic vulnerability in KRAS-driven non-small cell lung cancer.
• Intestinal L-arginine transport can be reversibly stimulated, linking this activity to gut physiology and systemic arginine availability.
• Arginine transport is relevant to immune, metabolic, and neurological contexts, including esophageal immune function and oxytocin receptor biology.
• CRISPR knockout, point mutation, knock-in, and overexpression models are essential to dissect the causal roles of arginine transporters.
Description
L-arginine transmembrane transporter activity (GO:0061459) is a molecular function that enables the movement of L-arginine from one side of a membrane to the other. This activity is fundamental to cellular amino acid homeostasis, because L-arginine serves as a substrate for protein synthesis, nitric oxide production, polyamine biosynthesis, and creatine synthesis. The QuickGO definition captures the core transport reaction, while the many synonyms reflect historical and mechanistic diversity, including arginine permease, arginine porter, and ATPase-coupled L-arginine transport activities. Researchers study this term because arginine transporters sit at the interface between nutrient availability and intracellular signaling. For example, SLC38A9 functions as a lysosomal arginine sensor that activates mTORC1 in a cholesterol-dependent manner, and TM4SF5 senses arginine to regulate mTORC1 signaling. In cancer, oncogenic KRAS induces arginine auxotrophy and confers sensitivity to SLC7A1 inhibition in non-small cell lung cancer, directly linking arginine transport to tumor metabolism. In the intestine, system y+ L-arginine transport activity can be reversibly stimulated, showing that this function is dynamically regulated in normal physiology. Thus, GO:0061459 is not merely a housekeeping transport reaction; it is a key node in nutrient sensing, immune function, and disease. Understanding its genes, mechanisms, and regulation is essential for both basic cell biology and translational research.
L-arginine transmembrane transporter activity At A Glance
| GO ID | GO:0061459 |
|---|---|
| GO term | L-arginine transmembrane transporter activity |
| Ontology | molecular_function |
| Definition | Enables the transfer of L-arginine from one side of a membrane to the other. |
| Synonyms | arginine-importing ATPase activity; arginine permease activity; arginine porter activity; arginine transmembrane transporter activity; ATPase-coupled L-arginine transmembrane transporter activity; ATP-dependent L-arginine transmembrane transporter activity; histidine/arginine/lysine/ornithine porter activity; L-arginine-importing ATPase activity; L-arginine transporter activity |
| Major function | Transports L-arginine across membranes to support amino acid homeostasis and signaling. |
| Related signaling | mTORC1 nutrient sensing via SLC38A9 and TM4SF5. |
| Disease relevance | Cancer metabolism, immune function, and intestinal physiology. |
| Research methods | CRISPR KO/point mutation/knock-in/overexpression, transport assays, signaling readouts. |
What Is GO:0061459?
In simple terms, GO:0061459 describes the protein activity that carries L-arginine across a biological membrane. The official QuickGO definition states: Enables the transfer of L-arginine from one side of a membrane to the other. This activity may be mediated by channels, carriers, or ATP-dependent pumps, and it is distinct from the broader amino acid transport activities that handle multiple substrates. The term includes synonyms such as arginine permease activity, arginine porter activity, and ATPase-coupled L-arginine transmembrane transporter activity, reflecting different mechanistic classes. When annotating a gene product with GO:0061459, evidence must show direct L-arginine transport across a membrane, not merely binding or intracellular metabolism.
Why Is L-arginine transmembrane transporter activity Important in Cell Biology?
GO:0061459 is important because L-arginine is a conditionally essential amino acid that controls protein synthesis, nitric oxide signaling, and immune cell function. Transport across membranes determines intracellular arginine availability, and this activity is directly coupled to mTORC1 signaling through sensors such as SLC38A9 and TM4SF5. In cancer, SLC7A1-mediated arginine uptake supports KRAS-driven non-small cell lung cancer, and its inhibition is a therapeutic vulnerability. In the intestine, system y+ L-arginine transport can be reversibly stimulated, linking this activity to gut physiology. In immune and neurological contexts, arginine transport intersects with oxytocin receptor signaling and esophageal immune function. Therefore, studying this GO term helps explain how cells sense and respond to nutrients, and it offers targets for metabolic and immune diseases.
• Controls intracellular L-arginine availability for protein synthesis and signaling.
• Couples nutrient sensing to mTORC1 activation via SLC38A9 and TM4SF5.
• Supports tumor growth in KRAS-driven lung cancer through SLC7A1.
• Regulates intestinal arginine absorption and systemic arginine levels.
• Impacts immune cell function and esophageal immune responses.
• Intersects with oxytocin receptor biology and neurological signaling.
• Provides a therapeutic target for arginine auxotrophy in cancer.
• Can be studied with CRISPR KO, point mutation, knock-in, and overexpression models.
• Relevant to metabolic reprogramming and amino acid stress responses.
• Helps interpret transport assays and nutrient-sensing experiments.
What Happens During L-arginine transmembrane transporter activity?
Substrate recognition and binding
In simple terms: The transporter first grabs L-arginine from one side of the membrane.
L-arginine transporters recognize the positively charged amino acid through specific binding pockets. In intestinal cells, system y+ activity can be reversibly stimulated, indicating that substrate recognition is regulated. The lysosomal transporter SLC38A9 binds arginine and signals its availability to mTORC1. TM4SF5 also senses arginine to regulate mTORC1 signaling.
Translocation across the membrane
In simple terms: The transporter moves L-arginine through the membrane to the other side.
After binding, the transporter undergoes conformational changes to transfer L-arginine across the lipid bilayer. This step is the core of GO:0061459 and can be mediated by channels, carriers, or ATP-dependent pumps. The QuickGO definition explicitly describes transfer from one side of a membrane to the other. SLC7A1-mediated arginine transport is essential for KRAS-driven lung cancer growth.
Release and intracellular availability
In simple terms: Once inside, L-arginine is released for cellular use.
The transported L-arginine becomes available for protein synthesis, nitric oxide production, and other metabolic pathways. In cancer cells, this release supports anabolic growth and is linked to arginine auxotrophy. In immune tissues, arginine availability influences esophageal immune function.
Coupling to nutrient signaling
In simple terms: The transport event tells the cell whether arginine is available.
Arginine transport is coupled to mTORC1 signaling. SLC38A9 acts as a lysosomal arginine sensor that activates mTORC1 in a cholesterol-dependent manner. TM4SF5 senses arginine for mTORC1 signaling. This coupling allows cells to adjust growth and metabolism based on arginine supply.
Key Genes Involved in GO:0061459 L-arginine transmembrane transporter activity
The following genes and proteins are directly or functionally linked to L-arginine transmembrane transporter activity (GO:0061459) based on published literature.
| Gene | Major Role | Research Relevance |
|---|---|---|
| SLC38A9 | Lysosomal arginine sensor and transporter | Activates mTORC1 in response to arginine and cholesterol |
| TM4SF5 | Arginine sensor for mTORC1 signaling | Regulates nutrient sensing and cell growth |
| SLC7A1 | L-arginine transporter | Supports KRAS-driven lung cancer; therapeutic target |
| SLC3A2 | Heavy chain partner for amino acid transporters | Forms heteromeric transporters with light chains for arginine uptake |
| SLC7A2 | Cationic amino acid transporter | Contributes to arginine transport in various tissues |
| SLC7A3 | Cationic amino acid transporter | Mediates arginine uptake in specific cell types |
| SLC7A4 | Cationic amino acid transporter | Potential arginine transport activity |
| SLC7A5 | L-type amino acid transporter | Transports large neutral amino acids; may influence arginine availability |
| SLC7A6 | y+L amino acid transporter | Transports arginine and other cationic amino acids |
| SLC7A7 | y+L amino acid transporter | Mediates arginine transport in intestine and kidney |
| SLC7A8 | L-type amino acid transporter | Indirectly affects arginine homeostasis |
| SLC7A9 | b0,+ amino acid transporter | Transports arginine in kidney and intestine |
| SLC7A10 | Asc-type amino acid transporter | May contribute to arginine transport |
| SLC7A11 | Cystine/glutamate transporter | Indirectly linked to arginine metabolism |
| SLC25A29 | Mitochondrial arginine transporter | Transports arginine into mitochondria |
| SLC25A15 | Mitochondrial ornithine transporter | Related to arginine metabolism |
| NOS1 | Nitric oxide synthase | Uses L-arginine as substrate |
How Is L-arginine transmembrane transporter activity Regulated?
L-arginine transmembrane transporter activity is regulated at multiple levels. In intestinal cells, system y+ L-arginine transport activity can be reversibly stimulated, indicating acute regulation of transport capacity. Nutrient signaling pathways, especially mTORC1, are coupled to arginine transport through sensors such as SLC38A9 and TM4SF5. In cancer, oncogenic KRAS induces arginine auxotrophy and increases dependence on SLC7A1, suggesting that oncogenic signaling rewires transport regulation. Immune and neurological contexts also modulate arginine transport, as seen in esophageal immune function and oxytocin receptor biology. Thus, regulation occurs through substrate availability, signaling feedback, and transcriptional or post-translational control of transporter genes.
L-arginine transmembrane transporter activity and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| SLC7A1 | KRAS-driven non-small cell lung cancer | SLC7A1 knockout or overexpression in lung cancer cell lines |
| SLC38A9 | mTORC1 signaling and metabolic disorders | SLC38A9 knockout cells with arginine stimulation |
| TM4SF5 | Nutrient sensing and cancer | TM4SF5 knockout or point mutation models |
| SLC7A2 | Intestinal arginine transport | Intestinal epithelial cell knockout |
| NOS1 | Nitric oxide-related neurological function | NOS1 knockout with arginine transport modulation |
Cancer metabolism and arginine auxotrophy
Oncogenic KRAS induces arginine auxotrophy and confers a therapeutic vulnerability to SLC7A1 inhibition in non-small cell lung cancer. This links GO:0061459 directly to tumor metabolism, because cancer cells depend on arginine uptake to sustain growth. Targeting SLC7A1 or related transporters may selectively kill KRAS-driven tumors.
Immune and gastrointestinal disorders
Arginine transport influences immune functions of the esophagus, and altered transport may contribute to esophageal immune disorders. In intestinal cells, system y+ L-arginine transport can be reversibly stimulated, suggesting that dysregulation could affect gut physiology and systemic arginine availability.
Neurological and receptor-linked signaling
The oxytocin receptor is linked to intracellular signaling and behavior, and arginine transport may influence nitric oxide production that modulates neuronal function. Although direct evidence for arginine transporters in neurological disease is limited, the intersection of arginine metabolism and oxytocin signaling suggests a potential role.
From L-arginine transmembrane transporter activity-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does loss of SLC7A1 reduce arginine uptake and tumor growth? | SLC7A1 knockout in KRAS-driven lung cancer cells |
| Does SLC38A9 arginine sensing require specific residues? | SLC38A9 point mutation knock-in |
| Can TM4SF5 arginine sensing be tracked in live cells? | TM4SF5 tagged knock-in |
| Does overexpression of SLC7A2 increase intestinal arginine transport? | SLC7A2 overexpression in intestinal cells |
| Is system y+ activity required for immune responses? | CRISPR knockout of cationic amino acid transporters in immune cells |
| Does arginine transport modulate oxytocin receptor signaling? | Knockout of arginine transporters in neuronal models |
How to Study the L-arginine transmembrane transporter activity Process
| Method | What It Measures | Typical Application |
|---|---|---|
| Radiolabeled arginine uptake | Direct transport activity | Measure system y+ stimulation in intestinal cells |
| Fluorescent arginine transport assay | Real-time transport | Screen transporter inhibitors |
| Western blot for mTORC1 targets | Signaling activation | Test SLC38A9 and TM4SF5 function |
| CRISPR knockout | Loss-of-function effects | Validate SLC7A1 in cancer growth |
| RNA-seq | Transcriptional changes | Identify transporter expression profiles |
| Proteomics | Protein abundance and interactions | Study transporter complexes |
| Live-cell imaging | Subcellular localization | Track tagged transporters |
| Bioinformatics pathway analysis | Functional enrichment | Interpret transport-related gene sets |
Transport assays
Radiolabeled or fluorescent L-arginine uptake assays measure direct transport activity. These assays can detect reversible stimulation of system y+ activity in intestinal cells and quantify SLC7A1-dependent uptake in cancer cells.
Signaling readouts
mTORC1 activity can be monitored by phosphorylation of downstream targets such as S6K1 and 4E-BP1. SLC38A9 and TM4SF5 knockout or knockdown models are used to link arginine transport to mTORC1 signaling.
Genetic screens and CRISPR models
CRISPR knockout, point mutation, knock-in, and overexpression models allow causal testing of transporter genes. For example, SLC7A1 knockout reduces arginine uptake and tumor growth in KRAS-driven lung cancer.
Omics and bioinformatics
RNA-seq and proteomics can identify transporter expression changes, while bioinformatics can predict transport activity from gene signatures. These approaches help prioritize candidates for functional validation.
How CRISPR Can Be Used to Study GO:0061459 L-arginine transmembrane transporter activity
Knockout
CRISPR knockout of SLC7A1 or SLC38A9 can abolish L-arginine transport and downstream signaling. For example, SLC7A1 knockout reduces arginine uptake and tumor growth in KRAS-driven lung cancer. Knockout of SLC38A9 impairs mTORC1 activation by arginine.
Point Mutation
Point mutations can dissect substrate binding or gating residues in arginine transporters. For instance, mutating key residues in SLC38A9 may disrupt arginine sensing without affecting localization. Such models help distinguish transport from signaling functions.
Knock-in
Knock-in of tagged transporters, such as TM4SF5, allows visualization and biochemical isolation of transport complexes. Knock-in of disease-associated variants can test their impact on arginine transport activity.
Overexpression
Overexpression of SLC7A2 or other transporters can increase L-arginine uptake and enhance downstream signaling. This approach is useful to test sufficiency of a transporter for arginine-dependent phenotypes.
How EDITGENE Supports L-arginine transmembrane transporter activity Research
Researchers studying L-arginine transmembrane transporter activity-related genes often need to determine whether a candidate gene is causally involved in arginine uptake, signaling, or disease. EDITGENE provides CRISPR-based cell model services to enable these functional studies.
Contact EDITGENE today to design your custom CRISPR model for L-arginine transmembrane transporter activity research.
Frequently Asked Questions About L-arginine transmembrane transporter activity
What is GO:0061459?
GO:0061459 is the Gene Ontology molecular function term for L-arginine transmembrane transporter activity, which enables the transfer of L-arginine from one side of a membrane to the other.
What genes are involved in L-arginine transmembrane transporter activity?
Key genes include SLC38A9, TM4SF5, SLC7A1, SLC3A2, and other SLC7 family transporters.
How is L-arginine transport linked to mTORC1 signaling?
SLC38A9 acts as a lysosomal arginine sensor that activates mTORC1, and TM4SF5 senses arginine for mTORC1 signaling.
Why is SLC7A1 important in cancer?
Oncogenic KRAS induces arginine auxotrophy, and SLC7A1 inhibition is a therapeutic vulnerability in non-small cell lung cancer.
Can L-arginine transport be regulated in intestinal cells?
Yes, system y+ L-arginine transport activity can be reversibly stimulated in human intestinal cells.
What methods study L-arginine transmembrane transporter activity?
Radiolabeled uptake assays, signaling readouts, CRISPR models, RNA-seq, proteomics, and imaging are commonly used.
What diseases are associated with arginine transporters?
Cancer metabolism, immune and gastrointestinal disorders, and neurological signaling have been linked to arginine transport.
How does CRISPR help study GO:0061459?
CRISPR knockout, point mutation, knock-in, and overexpression models allow causal testing of transporter genes.
Is arginine transport related to nitric oxide production?
Yes, L-arginine is a substrate for nitric oxide synthases such as NOS1, linking transport to nitric oxide signaling.
What are synonyms for GO:0061459?
Synonyms include arginine permease activity, arginine porter activity, and ATPase-coupled L-arginine transmembrane transporter activity.
Conclusion
GO:0061459 L-arginine transmembrane transporter activity is a central molecular function that controls cellular arginine availability and nutrient signaling. Its genes, including SLC38A9, TM4SF5, and SLC7A1, are linked to mTORC1 signaling, cancer metabolism, and intestinal physiology. Studying this activity with CRISPR models and transport assays will continue to reveal therapeutic opportunities in cancer and metabolic disease.
References
- 1. Jurek B et al.. 2018. The Oxytocin Receptor: From Intracellular Signaling to Behavior.. Physiol Rev 98(3):1805-1908 PMID: 29897293
- 2. Castellano BM et al.. 2017. Lysosomal cholesterol activates mTORC1 via an SLC38A9-Niemann-Pick C1 signaling complex.. Science 355(6331):1306-1311 PMID: 28336668
- 3. Jung JW et al.. 2019. Transmembrane 4 L Six Family Member 5 Senses Arginine for mTORC1 Signaling.. Cell Metab 29(6):1306-1319.e7 PMID: 30956113
- 4. Gai X et al.. 2024. Oncogenic KRAS Induces Arginine Auxotrophy and Confers a Therapeutic Vulnerability to SLC7A1 Inhibition in Non-Small Cell Lung Cancer.. Cancer Res 84(12):1963-1977 PMID: 38502865
- 7. Rochman M et al.. 2026. Immune functions of the esophagus.. J Allergy Clin Immunol 157(2):316-328 PMID: 41386478
- 8. Pan M et al.. 2002. Specific reversible stimulation of system y(+) L-arginine transport activity in human intestinal cells.. J Gastrointest Surg 6(3):379-86 PMID: 12022990
