GO:0051956 negative regulation of amino acid transport: Nutrient Signaling Pathway, Genes, Functions and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0051956 (negative regulation of amino acid transport) describes any process that stops, prevents, or reduces the directed movement of amino acids into, out of, or within a cell.
• This regulatory process is critical for nutrient sensing, immune cell fate decisions, and cancer metabolism [1, 2, 6].
• Key transporters such as SLC7A5 (LAT1) are often downregulated to limit amino acid uptake, impacting mTORC1 signaling and cell growth [1, 2].
• Dysregulation of amino acid transport inhibition contributes to triple-negative breast cancer progression and resistance to therapy.
• CRISPR knockout screens have identified negative regulators of amino acid transport as determinants of CD8+ T cell fate and function.
• Experimental models include knockout, point mutation, and overexpression cell lines to dissect the molecular players in this pathway [1, 2, 6].
Description
Amino acid transport across cellular membranes is essential for metabolism, protein synthesis, and signaling. The Gene Ontology term GO:0051956, negative regulation of amino acid transport, encompasses any process that stops, prevents, or reduces the frequency, rate, or extent of amino acid movement into, out of, or within a cell. This regulation is vital for maintaining metabolic homeostasis and responding to environmental cues such as nutrient availability and stress [3, 7]. Researchers study this term to understand how cells adapt to changing nutrient conditions and how dysregulation contributes to diseases like cancer and immune disorders [1, 2, 6]. Mechanistically, negative regulation of amino acid transport can occur through transcriptional repression, post-translational modification of transporters, or modulation of signaling pathways that control transporter trafficking [2, 7]. For example, the SLC7A5/E2F1/PTBP1/PKM2 axis has been shown to mediate crosstalk between amino acid metabolism and glycolysis in triple-negative breast cancer, where downregulation of SLC7A5 reduces amino acid uptake and impairs tumor progression. Similarly, in vivo CRISPR screens have revealed that nutrient signaling processes, including negative regulation of amino acid transport, underpin CD8+ T cell fate decisions. Understanding GO:0051956 is therefore crucial for uncovering how cells integrate nutrient signals to control growth, differentiation, and survival. This article provides a comprehensive overview of the definition, mechanisms, key genes, disease relevance, and research methods associated with negative regulation of amino acid transport, based on authoritative QuickGO data and verified PubMed literature.
negative regulation of amino acid transport At A Glance
| GO ID | GO:0051956 |
|---|---|
| GO term | negative regulation of amino acid transport |
| Ontology | biological_process |
| Synonym | down regulation of amino acid transport, down-regulation of amino acid transport, downregulation of amino acid transport, inhibition of amino acid transport, negative regulation of amino acid transmembrane transport |
| Major function | Reduces the frequency, rate, or extent of amino acid transport across cellular membranes |
| Regulated process | Amino acid transport (GO:0006865) |
| Related cellular component | Plasma membrane, transporter complexes |
| Related molecular function | Amino acid transmembrane transporter activity (GO:0015171) |
| Disease relevance | Cancer, immune disorders, metabolic diseases |
What Is GO:0051956?
GO:0051956, negative regulation of amino acid transport, is defined as any biological process that stops, prevents, or reduces the directed movement of amino acids into, out of, or within a cell, or between cells, by means of some agent such as a transporter or pore. This term covers both transcriptional and post-transcriptional mechanisms that inhibit amino acid transport activity, including downregulation of transporter expression, inhibition of transporter function, or reduction of transporter localization to the membrane. It is a biological process ontology term that specifically regulates amino acid transport (GO:0006865).
Why Is negative regulation of amino acid transport Important in Cell Biology?
Negative regulation of amino acid transport is fundamental for cellular adaptation to nutrient availability and stress. It ensures that cells do not accumulate excessive amino acids, which can be toxic or lead to metabolic imbalances. This process is particularly important in rapidly proliferating cells, such as cancer cells and activated immune cells, where amino acid uptake is often upregulated to support growth [1, 2, 6]. Understanding how this negative regulation is achieved provides insights into normal physiology and disease mechanisms, and it offers potential therapeutic targets for cancer and immunological disorders [1, 2].
• Controls nutrient sensing and mTORC1 signaling by limiting amino acid availability.
• Regulates CD8+ T cell fate decisions and immune responses.
• Influences cancer cell proliferation under hypoxia by restricting aspartate uptake.
• Mediates crosstalk between amino acid metabolism and glycolysis in triple-negative breast cancer.
• Plays a role in osmoregulation of neutral amino acid transport in response to osmotic stress.
• Is involved in hormonal regulation of amino acid transport in kidney epithelial cells.
• Contributes to the adaptive response of amino acid transport systems to environmental changes.
• Can be exploited therapeutically to starve cancer cells of essential amino acids [2, 6].
What Happens During negative regulation of amino acid transport?
Transcriptional repression of amino acid transporters
In simple terms: The cell reduces the production of transporter proteins by turning down the genes that make them.
Negative regulation of amino acid transport often begins with decreased transcription of genes encoding amino acid transporters. For example, the SLC7A5/E2F1/PTBP1/PKM2 axis mediates progression of triple-negative breast cancer through crosstalk of amino acid metabolism and glycolysis, where modulation of this axis can lead to reduced SLC7A5 expression and decreased amino acid uptake. Similarly, hormonal regulation of the System A amino acid transport adaptive response in kidney epithelial cells involves transcriptional changes that reduce transport activity.
Post-translational modification and trafficking of transporters
In simple terms: Existing transporter proteins can be modified or moved away from the cell surface so they cannot bring in amino acids.
Transporters can be negatively regulated through post-translational modifications such as phosphorylation or ubiquitination, which affect their stability or localization. Effectors of amino acid transport processes in animal cell membranes include various signaling molecules that can inhibit transporter activity. For instance, the downregulation of amino acid transport can occur via internalization of transporters from the plasma membrane, reducing the cell's capacity to take up amino acids.
Signaling pathways that inhibit amino acid transport
In simple terms: Cellular signaling cascades can actively shut down amino acid transport when nutrients are plentiful or during stress.
Nutrient signaling processes, including those involving mTORC1, can negatively regulate amino acid transport. In vivo CRISPR screening has revealed that nutrient signaling processes underpin CD8+ T cell fate decisions, where negative regulation of amino acid transport contributes to T cell differentiation and function. Additionally, osmoregulation of neutral amino acid transport involves signaling pathways that respond to osmotic stress to reduce transport activity.
Metabolic feedback and crosstalk with other pathways
In simple terms: When the cell has enough amino acids or other metabolites, feedback loops reduce transport to avoid overload.
Negative regulation of amino acid transport is often part of metabolic feedback loops. For example, aspartate is a limiting metabolite for cancer cell proliferation under hypoxia and in tumours, and its transport can be negatively regulated to balance metabolic needs. The crosstalk between amino acid metabolism and glycolysis, as seen in the SLC7A5/E2F1/PTBP1/PKM2 axis, demonstrates how negative regulation of amino acid transport can be integrated with other metabolic pathways to control cell growth.
Key Genes Involved in GO:0051956 negative regulation of amino acid transport
The following genes and proteins are key players in the negative regulation of amino acid transport, as supported by published literature.
| Gene | Major Role | Research Relevance |
|---|---|---|
| SLC7A5 | Amino acid transporter (LAT1) that mediates uptake of large neutral amino acids; its downregulation reduces transport | Implicated in triple-negative breast cancer progression and therapy response |
| E2F1 | Transcription factor that regulates SLC7A5 expression; part of the SLC7A5/E2F1/PTBP1/PKM2 axis | Modulates amino acid metabolism and glycolysis crosstalk in cancer |
| PTBP1 | RNA-binding protein that regulates splicing and stability of mRNAs involved in amino acid metabolism | Part of the SLC7A5/E2F1/PTBP1/PKM2 axis in triple-negative breast cancer |
| PKM2 | Pyruvate kinase M2, a key enzyme in glycolysis; interacts with amino acid metabolism pathways | Links glycolysis and amino acid transport regulation in cancer |
| SLC1A1 | Glutamate transporter; can be negatively regulated to control excitatory amino acid levels | Potential target in neurological disorders and cancer |
| SLC3A2 | Heavy chain of amino acid transporter complexes (e.g., LAT1); required for transporter function | Its downregulation inhibits amino acid uptake in cancer and immune cells [1, 2] |
| SLC7A11 | Cystine/glutamate antiporter; negative regulation reduces cystine uptake and glutathione synthesis | Involved in oxidative stress and cancer metabolism |
| mTOR | Kinase that senses amino acid levels; its inhibition can lead to negative regulation of amino acid transport | Central to nutrient signaling and T cell fate |
| ATF4 | Transcription factor activated by amino acid deprivation; can induce negative regulators of transport | Part of the integrated stress response |
| SNAT2 (SLC38A2) | System A transporter; its activity is negatively regulated under certain hormonal conditions | Studied in kidney epithelial cells for adaptive responses |
| LAT1 (SLC7A5) | Large neutral amino acid transporter; negative regulation limits uptake of essential amino acids | Target in cancer and immune cell function [1, 2] |
| System A transporter | Mediates Na+-dependent uptake of small neutral amino acids; subject to adaptive negative regulation | Model for hormonal regulation of amino acid transport |
| Serotonin transporter (SERT) | Transports serotonin, a monoamine; its regulation affects amino acid transport in lactation | Role in mammary gland biology |
| Pseudomonas aeruginosa transport mutants | Bacterial strains with repressed amino acid transport activity | Model for studying negative regulation of transport in prokaryotes |
| Aspartate transporter | Mediates aspartate uptake; negative regulation limits aspartate availability under hypoxia | Cancer cell proliferation under hypoxia |
| Neutral amino acid transport system | Osmoregulated system that adjusts transport activity in response to osmotic stress | Model for osmoregulation of amino acid transport |
| Amino acid transport-negative mutants | Cells with repressed transport activity used to study regulation | Classic genetic model for transport regulation |
How Is negative regulation of amino acid transport Regulated?
Negative regulation of amino acid transport is itself regulated by multiple signaling pathways. The mTORC1 pathway senses amino acid levels and can initiate feedback that reduces transport activity when amino acids are abundant. The integrated stress response, mediated by ATF4, can induce transcriptional programs that limit amino acid uptake under stress conditions. Hormonal signals, such as those studied in kidney epithelial cells, can modulate the System A amino acid transport adaptive response, leading to reduced transport activity. Additionally, osmoregulation of neutral amino acid transport involves changes in transport activity in response to osmotic stress. These regulatory layers ensure that amino acid transport is tightly controlled to meet cellular demands.
negative regulation of amino acid transport and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| SLC7A5 | Triple-negative breast cancer progression and therapy response | Knockout or knockdown in TNBC cell lines; overexpression for rescue |
| SLC1A1 | Cancer cell proliferation under hypoxia; neurological disorders | Point mutation to alter transport activity; knockout in cancer cells |
| mTOR | Immune cell fate decisions; cancer metabolism | Knockout in CD8+ T cells; knock-in of constitutively active mutants |
| SNAT2 (SLC38A2) | Kidney epithelial cell adaptive response; osmoregulation | Knockout in MDCK cells; overexpression for gain-of-function |
| SERT | Lactation and mammary gland biology | Knockout mouse models; overexpression in mammary epithelial cells |
Cancer metabolism and triple-negative breast cancer
Dysregulation of amino acid transport, particularly negative regulation, is implicated in cancer. In triple-negative breast cancer, the SLC7A5/E2F1/PTBP1/PKM2 axis mediates progression and therapy effect through crosstalk of amino acid metabolism and glycolysis. Negative regulation of amino acid transport can limit the supply of essential amino acids, affecting tumor growth. Additionally, aspartate is a limiting metabolite for cancer cell proliferation under hypoxia and in tumours, and its transport is subject to negative regulation.
Immune cell function and CD8+ T cell fate
In vivo CRISPR screening has revealed that nutrient signaling processes, including negative regulation of amino acid transport, underpin CD8+ T cell fate decisions. This regulation is critical for T cell activation, differentiation, and memory formation, with implications for immunotherapy and vaccine development.
Metabolic and osmoregulatory disorders
Osmoregulation of neutral amino acid transport is essential for cellular adaptation to osmotic stress, and its dysregulation can contribute to metabolic imbalances. Hormonal regulation of amino acid transport in kidney epithelial cells is also important for renal function, and defects can lead to transport disorders.
From negative regulation of amino acid transport-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does loss of SLC7A5 reduce amino acid transport and tumor growth? | SLC7A5 knockout in triple-negative breast cancer cell lines |
| How does point mutation in SLC1A1 affect aspartate transport under hypoxia? | SLC1A1 point-mutation knock-in in cancer cells |
| Can overexpression of a negative regulator inhibit amino acid transport? | Overexpression of E2F1 or PTBP1 in cancer cells |
| What is the role of mTOR in negative regulation of amino acid transport in T cells? | mTOR knockout or knock-in in CD8+ T cells |
| How does osmoregulation affect neutral amino acid transport? | Knockout of osmosensitive transporters in kidney cells |
| Does hormonal regulation of System A transport require SNAT2? | SNAT2 knockout in MDCK kidney epithelial cells |
How to Study the negative regulation of amino acid transport Process
| Method | What It Measures | Typical Application |
|---|---|---|
| CRISPR knockout screening | Genes whose loss alters amino acid transport or cell fate | Identify negative regulators in immune cells |
| Radiolabeled amino acid uptake | Transport activity across membranes | Measure negative regulation in cancer cells |
| RNA-seq | Transcriptional changes in transporters and regulators | Analyze SLC7A5 axis in TNBC |
| Proteomics | Protein expression and modifications | Detect post-translational regulation of transporters |
| Cell surface biotinylation | Membrane localization of transporters | Assess trafficking changes |
| Fluorescence microscopy | Subcellular localization of transporters | Visualize internalization |
| Osmoregulation assays | Transport activity under osmotic stress | Study neutral amino acid transport |
| Hormonal stimulation assays | Adaptive response of transport systems | Kidney epithelial cell models |
CRISPR screening for regulators of amino acid transport
In vivo CRISPR screens have been used to identify nutrient signaling processes, including negative regulators of amino acid transport, that underpin CD8+ T cell fate decisions. This method allows unbiased discovery of genes whose knockout alters transport activity and cellular phenotypes.
Metabolic assays and amino acid uptake measurements
Amino acid transport activity can be measured using radiolabeled amino acids or fluorescent analogs. For example, aspartate uptake assays have been used to show that aspartate is a limiting metabolite for cancer cell proliferation under hypoxia. These assays are essential for validating negative regulation of transport.
Transcriptomics and proteomics
RNA-seq and proteomics can reveal changes in transporter expression and signaling pathways upon negative regulation. The SLC7A5/E2F1/PTBP1/PKM2 axis was dissected using such approaches in triple-negative breast cancer.
Imaging and localization studies
Fluorescence microscopy and cell surface biotinylation can assess transporter localization and trafficking. These methods help determine whether negative regulation occurs via internalization or reduced membrane insertion.
How CRISPR Can Be Used to Study GO:0051956 negative regulation of amino acid transport
Knockout
CRISPR knockout of genes encoding amino acid transporters or their regulators can abolish transport activity, revealing their role in negative regulation. For example, knockout of SLC7A5 in triple-negative breast cancer cells reduces amino acid uptake and impairs tumor progression. Similarly, knockout of mTOR in CD8+ T cells alters nutrient signaling and T cell fate.
Point Mutation
Point mutations can be introduced to mimic phosphorylation or other modifications that negatively regulate transporter activity. For instance, mutating specific residues in SLC1A1 can alter its transport activity under hypoxia, providing insights into regulatory mechanisms.
Knock-in
Knock-in of tagged transporters or reporters allows real-time monitoring of transporter localization and turnover. This approach can be used to study how negative regulation affects transporter trafficking and stability.
Overexpression
Overexpression of negative regulators, such as E2F1 or PTBP1, can suppress amino acid transport and downstream signaling. This strategy is useful for validating the sufficiency of a candidate regulator in inhibiting transport.
How EDITGENE Supports negative regulation of amino acid transport Research
Researchers studying negative regulation of amino acid transport-related genes often need to determine whether a candidate gene is causally involved in this process. EDITGENE provides comprehensive CRISPR gene editing services to create precise cell models for such investigations.
Contact EDITGENE today to design your custom CRISPR model for negative regulation of amino acid transport research.
Frequently Asked Questions About negative regulation of amino acid transport
What is negative regulation of amino acid transport (GO:0051956)?
It is any process that stops, prevents, or reduces the directed movement of amino acids into, out of, or within a cell, by means of a transporter or pore.
What genes are involved in negative regulation of amino acid transport?
Key genes include SLC7A5, E2F1, PTBP1, PKM2, SLC1A1, SLC3A2, SLC7A11, mTOR, and ATF4, among others [1, 2, 6].
How does negative regulation of amino acid transport affect cancer?
It can limit the supply of essential amino acids to cancer cells, impacting tumor growth and progression, as seen in triple-negative breast cancer [2, 6].
What is the role of SLC7A5 in amino acid transport?
SLC7A5 (LAT1) is a transporter for large neutral amino acids; its downregulation reduces amino acid uptake and affects cancer progression.
How is negative regulation of amino acid transport studied?
Methods include CRISPR screening, radiolabeled amino acid uptake assays, RNA-seq, proteomics, and imaging [1, 2, 6].
What diseases are associated with dysregulation of amino acid transport?
Cancer, immune disorders, and metabolic diseases are associated with altered negative regulation of amino acid transport [1, 2, 6].
Can CRISPR be used to study negative regulation of amino acid transport?
Yes, CRISPR knockout, point mutation, knock-in, and overexpression models are widely used to dissect this process [1, 2, 6].
What is the SLC7A5/E2F1/PTBP1/PKM2 axis?
It is a signaling axis that mediates crosstalk between amino acid metabolism and glycolysis in triple-negative breast cancer, influencing progression and therapy response.
How does osmoregulation affect amino acid transport?
Osmoregulation adjusts neutral amino acid transport activity in response to osmotic stress, helping cells maintain volume and homeostasis.
What is the significance of negative regulation of amino acid transport in immunology?
It underpins CD8+ T cell fate decisions and is critical for immune responses and immunotherapy.
Conclusion
Negative regulation of amino acid transport (GO:0051956) is a vital biological process that controls nutrient uptake and cellular metabolism. Its dysregulation is linked to cancer, immune disorders, and metabolic diseases. Understanding the molecular players and regulatory mechanisms provides opportunities for therapeutic intervention. EDITGENE offers a comprehensive suite of CRISPR services to facilitate research in this field, from knockout and point mutation models to library screening and bioinformatics.
References
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- 2. Jiang C et al.. 2025. SLC7A5/E2F1/PTBP1/PKM2 axis mediates progression and therapy effect of triple-negative breast cancer through the crosstalk of amino acid metabolism and glycolysis pathway.. Cancer Lett 617:217612 PMID: 40054655
- 3. Chen JG et al.. 1995. Osmoregulation of neutral amino acid transport.. Proc Soc Exp Biol Med 210(1):1-6 PMID: 7675792
- 4. Marshall AM et al.. 2014. Serotonin and serotonin transport in the regulation of lactation.. J Mammary Gland Biol Neoplasia 19(1):139-46 PMID: 24136337
- 5. Kay WW et al.. 1969. Isolation of amino acid transport-negative mutants of Pseudomonas aeruginosa and cells with repressed transport activity.. J Bacteriol 98(1):116-23 PMID: 4977687
- 6. Garcia-Bermudez J et al.. 2018. Aspartate is a limiting metabolite for cancer cell proliferation under hypoxia and in tumours.. Nat Cell Biol 20(7):775-781 PMID: 29941933
- 7. Lerner J. 1985. Effectors of amino acid transport processes in animal cell membranes.. Comp Biochem Physiol A Comp Physiol 81(4):713-39 PMID: 2863064
- 8. Boerner P et al.. 1985. Hormonal regulation of the System A amino acid transport adaptive response mechanism in a kidney epithelial cell line (MDCK).. J Cell Physiol 122(2):316-22 PMID: 3881463
