GO:0045763 negative regulation of amino acid metabolic process: Metabolic Control, Genes, Functions and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0045763 describes any biological process that stops, prevents, or reduces the frequency, rate, or extent of amino acid metabolism.
• The term is a biological_process ontology annotation that captures negative regulation at the level of amino acid metabolic pathways, not a single gene or protein.
• Key regulatory nodes include mTORC1 signaling, the integrated stress response (ISR), and transcription factors such as ATF4, MYC, and KDM2B.
• Dysregulation of negative regulation of amino acid metabolism is linked to cancer progression, metabolic disorders, and inflammatory diseases such as psoriasis and diabetic retinopathy.
• Experimental dissection of this process relies on CRISPR knockout, point-mutation, knock-in, and overexpression models combined with metabolomics, Ribo-seq, and RNA-seq.
• EDITGENE provides end-to-end CRISPR cell model generation and CRISPR library screening to study negative regulation of amino acid metabolic process in disease contexts.
Description
Amino acid metabolism is a fundamental cellular activity that supplies building blocks for protein synthesis, nucleotide synthesis, and energy production. The Gene Ontology (GO) term GO:0045763, negative regulation of amino acid metabolic process, defines any process that stops, prevents, or reduces the frequency, rate, or extent of the chemical reactions and pathways involving amino acids. This term is essential for researchers because amino acid metabolic flux must be tightly controlled to match nutrient availability, cellular stress, and biosynthetic demand. Dysregulation of this negative regulation contributes to diseases ranging from cancer to inflammatory and metabolic disorders. Understanding the molecular players that enforce this negative regulation provides a framework for therapeutic targeting and biomarker discovery.
negative regulation of amino acid metabolic process At A Glance
| GO ID | GO:0045763 |
|---|---|
| GO term | negative regulation of amino acid metabolic process |
| Ontology | biological_process |
| Synonym | down regulation of amino acid metabolic process; down-regulation of amino acid metabolic process; downregulation of amino acid metabolic process; inhibition of amino acid metabolic process; negative regulation of amino acid metabolism |
| Major function | Stops, prevents, or reduces the frequency, rate, or extent of amino acid metabolic pathways |
| Regulatory inputs | mTORC1 signaling, integrated stress response (ISR), transcription factors (ATF4, MYC, KDM2B), and nutrient sensors |
| Disease relevance | Cancer, psoriasis, diabetic retinopathy, and metabolic disorders |
| Experimental models | CRISPR knockout, point mutation, knock-in, overexpression, and CRISPR library screening |
What Is GO:0045763?
GO:0045763 is a biological_process term that encompasses any mechanism that negatively regulates amino acid metabolic processes. In practical terms, it includes signaling events, transcriptional programs, and post-transcriptional controls that reduce the rate or extent of amino acid synthesis, breakdown, or interconversion. This regulation ensures that amino acid metabolism is suppressed when nutrients are scarce or when metabolic intermediates are not needed, and it is often coordinated with protein synthesis and cell growth pathways.
Why Is negative regulation of amino acid metabolic process Important in Cell Biology?
Negative regulation of amino acid metabolic process is critical because it prevents wasteful or inappropriate metabolic activity and integrates nutrient status with cell growth and survival decisions. When this regulation fails, cells can accumulate toxic metabolites, support uncontrolled proliferation, or drive inflammation, as seen in cancer and metabolic diseases. Therefore, understanding the mechanisms that enforce this negative regulation is essential for identifying therapeutic targets and developing precision medicine strategies.
• Maintains metabolic homeostasis by matching amino acid metabolism to nutrient availability.
• Prevents excessive amino acid catabolism or synthesis that could deplete essential intermediates.
• Coordinates with mTORC1 signaling to control cell growth and proliferation.
• Is hijacked in cancer to support tumor progression and therapy resistance.
• Contributes to inflammatory diseases such as psoriasis and diabetic retinopathy.
• Involves transcriptional regulators such as KDM2B, MYC, and ATF4 that reprogram metabolism.
• Can be dysregulated by translation initiation factors like eIF4E.
• Provides a target for CRISPR-based functional genomics and drug discovery.
What Happens During negative regulation of amino acid metabolic process?
Nutrient sensing and mTORC1 signaling
In simple terms: Cells check if amino acids are available and adjust metabolism accordingly.
The mechanistic target of rapamycin complex 1 (mTORC1) is a central sensor of amino acid sufficiency. When amino acids are abundant, mTORC1 promotes anabolic processes; when they are scarce, negative regulation of amino acid metabolism is engaged to conserve resources. The tumor suppressor complex with GAP activity for the Rag GTPases (GATOR1) inhibits mTORC1 signaling under amino acid deprivation, thereby reducing amino acid metabolic flux.
Integrated stress response (ISR) and translational control
In simple terms: Under stress, cells slow down protein production and alter amino acid use.
The integrated stress response (ISR) is activated by amino acid limitation and other stresses. Phosphorylation of eIF2α by stress-activated kinases reduces global translation while selectively increasing translation of stress-responsive transcription factors such as ATF4. This translational reprogramming negatively regulates amino acid metabolic genes to restore homeostasis.
Transcriptional repression by KDM2B and MYC
In simple terms: Specific proteins can turn down the genes that make or break down amino acids.
KDM2B, a component of the non-canonical polycomb repressive complex 1 (ncPRC1.1), transcriptionally regulates amino acid metabolism in concert with MYC and ATF4. KDM2B can repress genes involved in amino acid synthesis and catabolism, thereby contributing to negative regulation of amino acid metabolic process.
Post-transcriptional and metabolic feedback
In simple terms: Metabolites themselves can signal back to shut down pathways.
Amino acid levels can feedback to inhibit upstream enzymes or transporters. For example, SLC7A5-mediated amino acid transport influences glycolysis and amino acid metabolism in triple-negative breast cancer, and its inhibition can reduce metabolic flux. Such feedback loops represent negative regulation of amino acid metabolic process.
Key Genes Involved in GO:0045763 negative regulation of amino acid metabolic process
The following genes and proteins are experimentally validated regulators or effectors of negative regulation of amino acid metabolic process.
| Gene | Major Role | Research Relevance |
|---|---|---|
| mTORC1 | Central kinase complex that senses amino acids and promotes anabolism | Target for metabolic regulation studies |
| GATOR1 | GAP complex that inhibits Rag GTPases and mTORC1 under amino acid scarcity | Tumor suppressor and negative regulator |
| eIF2α | Translation initiation factor phosphorylated during ISR | Key node in stress-induced metabolic repression |
| ATF4 | Stress-induced transcription factor that reprograms amino acid metabolism | Mediator of ISR-driven negative regulation |
| eIF4E | Cap-binding protein that controls translation of metabolic genes | Depletion dysregulates amino acid metabolic gene expression |
| KDM2B | Histone demethylase in ncPRC1.1 that represses metabolic genes | Transcriptional regulator of amino acid metabolism |
| MYC | Oncogenic transcription factor that cooperates with KDM2B | Context-dependent regulator of amino acid metabolism |
| SLC7A5 | Amino acid transporter that supports metabolic crosstalk | Therapeutic target in triple-negative breast cancer |
| E2F1 | Transcription factor in SLC7A5 axis | Linked to amino acid metabolism and glycolysis |
| PTBP1 | RNA-binding protein in SLC7A5 axis | Modulates metabolic gene expression |
| PKM2 | Glycolytic enzyme in SLC7A5 axis | Connects amino acid metabolism and glycolysis |
| BCAT1 | Branched-chain amino acid transaminase | Reprogrammed in diabetic retinopathy |
| Rag GTPases | Signal amino acid sufficiency to mTORC1 | Direct targets of GATOR1 |
| TSC1/TSC2 | Tumor suppressor complex upstream of mTORC1 | Negative regulators of growth and metabolism |
| LARS1 | Leucyl-tRNA synthetase that senses leucine | Amino acid sensor in mTORC1 pathway |
| Sestrin2 | Leucine sensor that inhibits mTORC1 | Negative regulator of amino acid signaling |
| CASTOR1 | Arginine sensor that inhibits mTORC1 | Negative regulator of amino acid signaling |
How Is negative regulation of amino acid metabolic process Regulated?
Negative regulation of amino acid metabolic process is itself regulated by multiple layers of control. The mTORC1 pathway integrates amino acid availability with growth signals; when amino acids are limiting, GATOR1 and sensors such as Sestrin2 and CASTOR1 inhibit mTORC1, reducing anabolic metabolism. The integrated stress response, triggered by amino acid deprivation, phosphorylates eIF2α to suppress global translation while favoring ATF4 translation, which then induces genes that restore homeostasis. Additionally, eIF4E levels influence the translation of amino acid metabolic mRNAs, and its depletion dysregulates their expression. Transcriptional repression by KDM2B, MYC, and ATF4 further fine-tunes the metabolic output.
negative regulation of amino acid metabolic process and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| SLC7A5 | Triple-negative breast cancer progression and therapy response | CRISPR knockout in TNBC cell lines |
| BCAT1 | Diabetic retinopathy and inflammation | Knockout or overexpression in retinal endothelial cells |
| KDM2B | Cancer and metabolic reprogramming | Knockout and rescue in cancer cell lines |
| eIF4E | Dysregulated amino acid metabolic gene expression | Inducible knockout or overexpression models |
| mTORC1/GATOR1 | Tumor suppression and metabolic disorders | Point mutation and knockout in cell lines |
Cancer metabolism and therapy resistance
In triple-negative breast cancer, the SLC7A5/E2F1/PTBP1/PKM2 axis mediates progression and therapy response by crosstalk between amino acid metabolism and glycolysis. Negative regulation of amino acid metabolism is often disrupted in cancer, allowing tumors to sustain growth under nutrient stress.
Inflammatory and metabolic diseases
Metabolomic profiling in psoriasis reveals amino acid and carnitine alterations as metabolic signatures, indicating that negative regulation of amino acid metabolism is perturbed in inflammatory skin disease. In diabetic retinopathy, BCAT1 activation reprograms branched-chain amino acid metabolism and epigenetically promotes inflammation.
Neurological and stress-related disorders
The integrated stress response, a key mediator of negative regulation of amino acid metabolism, is implicated in neurodegeneration and other stress-related conditions. Dysregulation of eIF2α signaling can alter amino acid metabolic gene expression and contribute to disease pathology.
From negative regulation of amino acid metabolic process-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does loss of a candidate gene increase amino acid metabolic flux? | CRISPR knockout cell line |
| Does a specific phosphorylation site control negative regulation? | Point mutation knock-in |
| Does a disease-associated variant alter metabolic repression? | Knock-in of mutant allele |
| Where is the regulator localized during metabolic stress? | Tagged knock-in (e.g., GFP) |
| Does overexpression of a regulator suppress amino acid metabolism? | Overexpression cell line |
| Which genes are essential for negative regulation? | CRISPR library screening |
How to Study the negative regulation of amino acid metabolic process Process
| Method | What It Measures | Typical Application |
|---|---|---|
| Metabolomics | Amino acid and metabolite levels | Profiling disease signatures |
| RNA-seq | Transcript abundance of metabolic genes | Transcriptional regulation studies |
| Ribo-seq | Translation efficiency | ISR and eIF4E studies |
| Proteomics | Protein expression of metabolic enzymes | Validation of metabolic changes |
| Phosphoproteomics | Signaling phosphorylation events | mTORC1 and ISR activity |
| CRISPR knockout screen | Gene essentiality for metabolic phenotypes | Discovery of regulators |
| CRISPR activation screen | Gain-of-function metabolic effects | Identifying suppressors |
| Stable isotope tracing | Metabolic flux | Pathway activity measurement |
Metabolomics and flux analysis
Metabolomic profiling can quantify amino acid levels and reveal alterations in negative regulation of amino acid metabolic process, as shown in psoriasis and cancer studies. Stable isotope tracing can measure flux through specific pathways.
Transcriptomics and Ribo-seq
RNA-seq measures changes in amino acid metabolic gene expression, while Ribo-seq captures translation efficiency, which is critical for ISR-mediated negative regulation. These methods identify transcriptional and translational reprogramming.
Proteomics and phosphoproteomics
Proteomics can assess protein abundance of metabolic enzymes, and phosphoproteomics can detect signaling events such as eIF2α phosphorylation and mTORC1 activity. These readouts confirm negative regulation at the protein level.
CRISPR screens and functional genomics
Genome-wide CRISPR knockout or activation screens can identify genes that regulate amino acid metabolism, as demonstrated in cancer models. These screens link candidate genes to metabolic phenotypes.
How CRISPR Can Be Used to Study GO:0045763 negative regulation of amino acid metabolic process
Knockout
CRISPR knockout of candidate genes such as SLC7A5, BCAT1, or KDM2B can test whether they are required for negative regulation of amino acid metabolic process. Knockout cell lines are valuable for metabolic phenotyping and drug response studies.
Point Mutation
Point mutation knock-in can dissect phosphorylation sites or catalytic residues in regulators like mTORC1 components or eIF2α. This approach reveals whether specific residues are necessary for negative regulation.
Knock-in
Knock-in of disease-associated variants or tagged alleles allows tracking of regulator localization and function under metabolic stress. Tagged knock-in models are useful for imaging and interaction studies.
Overexpression
Overexpression of negative regulators such as GATOR1 subunits or KDM2B can suppress amino acid metabolism and test sufficiency. This is particularly useful for validating tumor suppressor activity.
How EDITGENE Supports negative regulation of amino acid metabolic process Research
Researchers studying negative regulation of amino acid metabolic process-related genes often need to determine whether a candidate gene is causally involved in metabolic control, disease progression, or therapy response. EDITGENE provides publication-ready CRISPR cell models and screening services to accelerate this discovery.
Contact EDITGENE today to design your custom CRISPR model for negative regulation of amino acid metabolic process research.
Frequently Asked Questions About negative regulation of amino acid metabolic process
What is GO:0045763 negative regulation of amino acid metabolic process?
GO:0045763 is a Gene Ontology biological_process term defined as any process that stops, prevents, or reduces the frequency, rate, or extent of the chemical reactions and pathways involving amino acids.
What genes are involved in negative regulation of amino acid metabolic process?
Key genes include mTORC1, GATOR1, eIF2α, ATF4, eIF4E, KDM2B, MYC, SLC7A5, BCAT1, and PKM2, among others.
How is negative regulation of amino acid metabolism linked to cancer?
In triple-negative breast cancer, the SLC7A5/E2F1/PTBP1/PKM2 axis mediates progression and therapy response by crosstalk between amino acid metabolism and glycolysis. Disruption of negative regulation can support tumor growth.
What diseases are associated with dysregulated amino acid metabolism?
Psoriasis, diabetic retinopathy, and various cancers show altered amino acid metabolism and disrupted negative regulation.
What methods are used to study negative regulation of amino acid metabolic process?
Metabolomics, RNA-seq, Ribo-seq, proteomics, phosphoproteomics, and CRISPR screens are commonly used.
How does mTORC1 regulate amino acid metabolism?
mTORC1 senses amino acid sufficiency and promotes anabolism; when amino acids are scarce, GATOR1 inhibits mTORC1, reducing amino acid metabolic flux.
What is the integrated stress response (ISR)?
The ISR is a cellular stress response that phosphorylates eIF2α, reducing global translation while increasing ATF4 translation to restore homeostasis.
Can CRISPR be used to study negative regulation of amino acid metabolism?
Yes, CRISPR knockout, point mutation, knock-in, and overexpression models are powerful tools to dissect gene function in this process.
What is the role of KDM2B in amino acid metabolism?
KDM2B transcriptionally regulates amino acid metabolism in concert with MYC and ATF4, contributing to negative regulation.
How does eIF4E affect amino acid metabolic gene expression?
Depletion of eIF4E dysregulates amino acid metabolic gene expression, highlighting its role in translational control of metabolism.
Conclusion
GO:0045763 negative regulation of amino acid metabolic process is a critical biological process that integrates nutrient sensing, stress responses, and transcriptional control to maintain metabolic homeostasis. Its dysregulation is implicated in cancer, inflammatory diseases, and metabolic disorders, making it a rich area for therapeutic discovery. By leveraging CRISPR cell models and multi-omics approaches, researchers can dissect the molecular players and translate these findings into clinical applications.
References
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