GO:0034618 arginine binding: Mechanism, Genes and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0034618 (arginine binding) is a molecular function defined as binding to 2-amino-5-(carbamimidamido)pentanoic acid, the amino acid arginine.
• Arginine binding is mediated by cation-pi interactions, salt bridges, and hydrogen bonds, and is modulated by arginine methylation.
• Key arginine-binding proteins include neuropilin-1, FUS, MIWI, CASTOR1, and bacterial response regulators such as DosR.
• Arginine binding regulates diverse processes including phase separation, piRNA biogenesis, mTORC1 signaling, and bacterial gene transcription.
• Dysregulated arginine binding contributes to cancer, neurodegeneration, and metabolic disorders.
• CRISPR-based models (knockout, point mutation, knock-in, overexpression) enable causal interrogation of arginine-binding residues and domains.
Description
Arginine binding (GO:0034618) is a molecular function that describes the selective interaction of a protein or nucleic acid with the amino acid arginine (2-amino-5-(carbamimidamido)pentanoic acid). This binding event is fundamental to many biological processes, from RNA catalysis to signal transduction and transcriptional regulation. The unique chemical properties of arginine, including its positive charge and ability to form multiple hydrogen bonds, make it a versatile ligand for molecular recognition. Understanding arginine binding is therefore critical for deciphering mechanisms of protein-protein interactions, RNA-protein recognition, and metabolic sensing. Research has shown that arginine binding is not a passive event but is often regulated by post-translational modifications such as methylation, which can alter cation-pi interactions and phase separation behavior. For example, in the RNA-binding protein FUS, methylation of arginine residues modulates its phase separation, with implications for neurodegenerative diseases. Similarly, the arginine-binding site of neuropilin-1 has been structurally characterized, revealing a hydrated pocket that accommodates the amino acid with high specificity. These findings underscore the importance of arginine binding in both normal physiology and disease. In this article, we provide a comprehensive overview of GO:0034618, covering its definition, molecular mechanisms, key genes, associated diseases, and state-of-the-art research methods. We also highlight how CRISPR-based models can be used to study arginine-binding proteins and their roles in health and disease.
arginine binding At A Glance
| GO ID | GO:0034618 |
|---|---|
| GO term | arginine binding |
| Ontology | molecular_function |
| Synonym | aminopentanoic acid binding, Arg binding |
| Definition | Binding to 2-amino-5-(carbamimidamido)pentanoic acid. |
| Major function | Molecular recognition of arginine by proteins and nucleic acids, influencing processes such as RNA catalysis, signal transduction, and transcriptional regulation. |
| Related processes | Phase separation, piRNA biogenesis, mTORC1 signaling, bacterial transcription regulation. |
| Example proteins | Neuropilin-1, FUS, MIWI, CASTOR1, DosR. |
| Disease relevance | Cancer, neurodegeneration, metabolic disorders. |
What Is GO:0034618?
According to the Gene Ontology, arginine binding (GO:0034618) is the molecular function of binding to 2-amino-5-(carbamimidamido)pentanoic acid, which is the chemical name for the amino acid arginine. This term encompasses any interaction between a macromolecule (such as a protein or RNA) and arginine, whether free or as part of a peptide chain. The binding is typically non-covalent and can involve electrostatic interactions, hydrogen bonds, and cation-pi interactions.
Why Is arginine binding Important in Cell Biology?
Arginine binding is a fundamental molecular function that underpins numerous biological processes, from RNA splicing and translation to cell signaling and immune responses. Its dysregulation has been linked to a wide range of diseases, including cancer, neurodegenerative disorders, and metabolic syndromes. Moreover, arginine-binding motifs are common in proteins and often serve as regulatory switches, making them attractive targets for therapeutic intervention. Understanding the structural and mechanistic basis of arginine binding is therefore essential for both basic research and drug discovery.
• Arginine binding is essential for RNA catalysis, as exemplified by the Tetrahymena intron ribozyme.
• It regulates phase separation of RNA-binding proteins like FUS, with implications for neurodegeneration.
• Arginine binding to neuropilin-1 modulates angiogenesis and immune responses.
• In bacteria, arginine binding by DosR controls transcription of arginine biosynthesis genes.
• MIWI N-terminal arginines are required for piRNA biogenesis and spermiogenesis.
• CASTOR1 senses arginine to regulate mTORC1 signaling, linking amino acid availability to cell growth.
• Arginine methylation modulates cation-pi interactions and protein function.
• Lysine-arginine imbalance can overcome therapeutic tolerance in glioblastoma.
• ATP can act as a general protein binder, with arginine residues playing a key role.
• Arginine-binding sites are potential drug targets for cancer and metabolic diseases.
Molecular Mechanism of arginine binding
Chemical Basis of Arginine Recognition
In simple terms: Arginine is a positively charged amino acid that can form multiple interactions with proteins and RNA.
Arginine binding is driven by a combination of electrostatic interactions, hydrogen bonds, and cation-pi interactions. The guanidinium group of arginine is positively charged at physiological pH, allowing it to form salt bridges with negatively charged residues such as aspartate and glutamate. Additionally, the planar guanidinium group can engage in cation-pi interactions with aromatic residues like tryptophan and tyrosine, as seen in the FUS protein where methylation of arginine modulates these interactions. The binding site of neuropilin-1 for arginine is highly hydrated, with water molecules mediating some of the contacts, as revealed by crystallographic studies.
Structural Features of Arginine-Binding Sites
In simple terms: Proteins that bind arginine have specific pockets that fit the amino acid precisely.
High-resolution structures of arginine-binding proteins reveal that the binding pocket typically contains a cluster of acidic residues and aromatic residues that coordinate the guanidinium group. For example, the arginine-binding site of neuropilin-1 is formed by a shallow groove with a network of hydrogen-bonded water molecules that stabilize the interaction. In the Tetrahymena intron ribozyme, arginine binding occurs in a pocket formed by conserved nucleotides, demonstrating that RNA can also specifically recognize arginine. These structural insights are critical for understanding specificity and for designing inhibitors.
Regulation by Post-Translational Modifications
In simple terms: Chemical modifications to arginine can change how it binds to other molecules.
Arginine methylation is a common post-translational modification that can alter arginine binding. In FUS, methylation of arginine residues within the RGG domain reduces cation-pi interactions and inhibits phase separation, a process linked to neurodegenerative diseases. Similarly, the activity of MIWI, a piRNA biogenesis factor, depends on its N-terminal arginine residues, which may be subject to methylation. These modifications add a layer of regulation to arginine-binding events.
Arginine Binding in Signal Transduction
In simple terms: Arginine binding can act as a switch to turn cellular signals on or off.
In the mTORC1 pathway, the protein CASTOR1 binds arginine and thereby regulates mTORC1 activity in response to amino acid availability. Structural studies of the CASTOR1-GATOR2 complex have revealed how arginine binding induces conformational changes that affect the interaction with GATOR2, ultimately controlling cell growth. This demonstrates that arginine binding is not just a structural interaction but a key regulatory event in signaling.
Arginine Binding in Bacterial Transcription
In simple terms: Bacteria use arginine binding to control gene expression.
In Mycobacterium bovis BCG, the response regulator DosR binds to regulatory sequences of the arginine biosynthesis gene cluster, as shown by chromatin immunoprecipitation and transcriptional assays. This binding is essential for the bacterium's adaptation to hypoxia and other stresses. Thus, arginine binding plays a role in bacterial pathogenesis and could be a target for antimicrobial therapy.
Key Genes Involved in GO:0034618 arginine binding
The following genes encode proteins or RNAs that exhibit arginine-binding activity, as supported by published literature.
| Gene | Major Role | Research Relevance |
|---|---|---|
| FUS | RNA-binding protein involved in phase separation; arginine methylation modulates cation-pi interactions | Neurodegenerative diseases such as ALS; phase separation studies |
| NRP1 | Neuropilin-1; binds arginine and semaphorins to regulate angiogenesis and immune responses | Cancer, angiogenesis; structural studies of arginine-binding site |
| DosR | Response regulator in Mycobacterium bovis; binds arginine biosynthesis gene cluster | Bacterial transcription regulation; tuberculosis research |
| MIWI (PIWIL1) | Piwi-family protein; N-terminal arginines required for piRNA biogenesis | Spermatogenesis, fertility; piRNA pathway |
| CASTOR1 | Arginine sensor; binds arginine to regulate mTORC1 signaling | Cancer metabolism, mTORC1 regulation; structural biology |
| Tetrahymena intron | Self-splicing ribozyme; specifically binds arginine | RNA catalysis, origin of life; ribozyme studies |
| ATP | General protein binder; arginine residues influence ATP-protein interactions | Biophysical chemistry; protein stability |
| E3 ubiquitin ligase | Lysine-arginine imbalance affects E3-lysosome axis in glioblastoma | Cancer therapy resistance; amino acid metabolism |
| GATOR2 | Component of mTORC1 pathway; interacts with CASTOR1 in arginine-dependent manner | mTORC1 signaling; structural studies |
| Neuropilin-1 | Receptor for semaphorins and VEGF; arginine-binding site characterized | Angiogenesis, cancer; drug design |
| FUS RGG domain | Arginine-glycine-rich domain; mediates RNA binding and phase separation | ALS, FTD; methylation studies |
| MIWI N-terminus | Arginine-rich region; essential for piRNA generation | Male fertility; piRNA biogenesis |
| DosR regulon | Set of genes regulated by DosR binding to arginine biosynthesis cluster | Mycobacterial adaptation; gene regulation |
| CASTOR1-GATOR2 complex | Arginine-sensing complex; regulates mTORC1 | Cell growth control; structural biology |
| Tetrahymena group I intron | Catalytic RNA; arginine binding affects splicing | RNA enzymology; specificity |
| ATP-binding proteins | Many proteins bind ATP; arginine residues contribute to binding | General protein biochemistry |
| E3-lysosome axis | Regulated by lysine-arginine balance; affects therapeutic tolerance | Glioblastoma; drug resistance |
How Is arginine binding Regulated?
Arginine binding can be regulated at multiple levels. Post-translational methylation of arginine residues modulates cation-pi interactions and phase separation, as shown for FUS. In signaling, the availability of free arginine directly controls the interaction between CASTOR1 and GATOR2, thereby regulating mTORC1 activity. In bacteria, DosR binding to DNA is regulated by phosphorylation and environmental signals such as hypoxia. Additionally, the general protein-binding ability of ATP can be influenced by arginine residues, suggesting a broader regulatory role.
arginine binding and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| FUS | ALS, FTD; phase separation and aggregation | Knock-in of methylation-deficient arginine mutants in neurons |
| CASTOR1 | Cancer, metabolic disorders; mTORC1 dysregulation | Knockout of CASTOR1 in cancer cell lines; arginine-binding point mutants |
| NRP1 | Cancer, angiogenesis; immune evasion | Overexpression of NRP1 in endothelial cells; arginine-binding site mutants |
| DosR | Tuberculosis; bacterial adaptation | Knockout of DosR in Mycobacterium bovis; arginine-binding domain mutants |
| MIWI | Male infertility; piRNA biogenesis defects | Knock-in of arginine-to-alanine mutations in MIWI N-terminus |
Arginine Binding in Cancer
Dysregulated arginine binding contributes to cancer progression and therapy resistance. In glioblastoma, lysine-arginine imbalance overcomes therapeutic tolerance governed by the transcription factor E3-lysosome axis, suggesting that targeting arginine metabolism could improve treatment outcomes. CASTOR1, an arginine sensor, regulates mTORC1, a central pathway in cancer cell growth; its arginine-binding activity is therefore a potential therapeutic target. Neuropilin-1, which binds arginine, is overexpressed in many cancers and promotes angiogenesis and immune evasion.
Arginine Binding in Neurodegeneration
Arginine methylation and binding are implicated in neurodegenerative diseases. In FUS, methylation of arginine residues within the RGG domain inhibits phase separation, and dysregulation of this process leads to pathological aggregation seen in amyotrophic lateral sclerosis (ALS) and frontotemporal dementia (FTD). The arginine-binding properties of FUS are therefore critical for maintaining neuronal health.
Arginine Binding in Infectious Diseases
In Mycobacterium bovis BCG, the response regulator DosR binds to the arginine biosynthesis gene cluster to regulate transcription, which is important for bacterial survival under hypoxic conditions. This arginine-binding event is essential for the pathogen's adaptation and could be targeted for new anti-tuberculosis drugs.
Arginine Binding in Metabolic Disorders
CASTOR1 senses arginine levels to regulate mTORC1, linking amino acid availability to cell growth and metabolism. Dysregulation of this arginine-sensing mechanism may contribute to metabolic disorders such as obesity and diabetes, although further research is needed.
From arginine binding-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does arginine binding by FUS regulate phase separation? | Knock-in of arginine-to-alanine mutations in FUS RGG domain |
| Is CASTOR1 arginine binding required for mTORC1 regulation? | Point mutation of arginine-binding residues in CASTOR1; knockout |
| What is the role of NRP1 arginine binding in angiogenesis? | Knockout of NRP1 in endothelial cells; rescue with wild-type or binding-deficient NRP1 |
| How does DosR arginine binding affect bacterial transcription? | Knockout of DosR in Mycobacterium bovis; complemented with binding mutants |
| Does MIWI N-terminal arginine methylation affect piRNA biogenesis? | Knock-in of methylation-site mutations in MIWI |
| Can overexpression of arginine-binding proteins drive cancer? | Overexpression of CASTOR1 or NRP1 in cancer cell lines |
How to Study the arginine binding Process
| Method | What It Measures | Typical Application |
|---|---|---|
| X-ray crystallography | Atomic structure of protein-ligand complexes | Determining arginine-binding site architecture |
| Cryo-EM | Near-atomic structure of large complexes | Visualizing CASTOR1-GATOR2-arginine complex |
| Isothermal titration calorimetry (ITC) | Binding affinity and thermodynamics | Quantifying arginine binding to ribozymes or proteins |
| Surface plasmon resonance (SPR) | Real-time binding kinetics | Measuring arginine-protein interactions |
| CRISPR knockout | Gene function loss | Identifying essential arginine-binding proteins |
| CRISPR point mutation | Specific amino acid function | Testing arginine residues in FUS phase separation |
| RNA-seq | Global gene expression changes | Transcriptional response to arginine-binding perturbations |
| Proteomics | Protein abundance and modifications | Detecting arginine methylation changes |
Structural Biology of Arginine Binding
X-ray crystallography and cryo-electron microscopy are used to determine the atomic details of arginine-binding sites. For example, the structure of neuropilin-1 with arginine revealed a hydrated binding pocket, and the CASTOR1-GATOR2 complex structure showed how arginine binding induces conformational changes. These methods provide a blueprint for designing inhibitors.
Biochemical Assays for Arginine Binding
Isothermal titration calorimetry (ITC) and surface plasmon resonance (SPR) can measure binding affinity and kinetics. Such assays have been used to study the specificity of arginine binding by the Tetrahymena intron ribozyme and to assess the impact of arginine residues on ATP binding.
Functional Genomics and CRISPR Screens
CRISPR knockout and point-mutation screens can identify genes required for arginine binding and downstream processes. For instance, knockout of CASTOR1 in cancer cells can reveal its role in mTORC1 signaling. Similarly, knock-in of arginine mutations in FUS can test their effect on phase separation.
Transcriptomics and Proteomics
RNA-seq and proteomics can uncover global changes in gene expression and protein interactions upon modulation of arginine-binding proteins. In Mycobacterium bovis, ChIP-seq and RNA-seq were used to identify DosR-regulated genes. In glioblastoma, metabolomic and proteomic analyses linked lysine-arginine imbalance to therapeutic tolerance.
How CRISPR Can Be Used to Study GO:0034618 arginine binding
Knockout
CRISPR knockout of genes encoding arginine-binding proteins can reveal their essential functions. For example, knockout of CASTOR1 in cancer cells leads to constitutive mTORC1 activation, demonstrating its role as an arginine sensor. Similarly, knockout of DosR in Mycobacterium bovis affects the expression of arginine biosynthesis genes.
Point Mutation
Point mutations can be introduced to specifically disrupt arginine-binding residues. In FUS, mutation of arginine residues in the RGG domain to alanine abolishes cation-pi interactions and alters phase separation, providing insights into ALS pathogenesis. Such models are invaluable for dissecting the contribution of individual arginine residues.
Knock-in
Knock-in of tagged or mutant versions of arginine-binding proteins allows for precise tracking and functional analysis. For instance, knock-in of a methylation-deficient mutant of MIWI can test the role of arginine methylation in piRNA biogenesis. Knock-in of fluorescently tagged neuropilin-1 can visualize its trafficking and arginine-dependent functions.
Overexpression
Overexpression of arginine-binding proteins can mimic disease states or amplify signaling. Overexpression of CASTOR1 in cancer cells can suppress mTORC1 and inhibit growth, while overexpression of neuropilin-1 promotes angiogenesis. These models are useful for drug screening and target validation.
How EDITGENE Supports arginine binding Research
Researchers studying arginine binding-related genes often need to determine whether a candidate gene is causally involved in a specific biological process or disease. This requires precise genetic manipulation, which can be achieved through CRISPR-based models. EDITGENE provides a comprehensive suite of services to generate knockout, point-mutation, knock-in, and overexpression cell models, as well as CRISPR library screening and bioinformatics support.
Contact EDITGENE today to design your custom CRISPR model for arginine binding research.
Related Products
| Product name | Cat.No. | Species | Gene ID | |
|---|---|---|---|---|
| SLC38A9 Knockout HEK293T Cell Line | EDJ-KQ214 | Human | 153129 | Details Get a Quote |
| NOS3 Knockout HEK293 Cell Line | EDJ-KQ840 | Human | 4846 | Details Get a Quote |
| NOS1 Knockout HEK293 Cell Line | EDJ-KQ844 | Human | 4842 | Details Get a Quote |
| SLC38A9 Knockout HEK293 Cell Line | EDJ-KQ1142 | Human | 153129 | Details Get a Quote |
| CASTOR1 Knockout HEK293 Cell Line | EDJ-KQ1158 | Human | 652968 | Details Get a Quote |
| CASTOR2 Knockout HEK293 Cell Line | EDJ-KQ1159 | Human | 729438 | Details Get a Quote |
| NOS2 Knockout HEK293 Cell Line | EDJ-KQ1428 | Human | 4843 | Details Get a Quote |
| TM4SF5 Knockout HEK293 Cell Line | EDJ-KQ6439 | Human | 9032 | Details Get a Quote |
| SLC7A6 Knockout HEK293 Cell Line | EDJ-KQ6446 | Human | 9057 | Details Get a Quote |
| SLC38A9 Knockout HeLa Cell Line | EDJ-KQ18195 | Human | 153129 | Details Get a Quote |
| CASTOR2 Knockout HCT 116 Cell Line | EDJ-KQ19057 | Human | 729438 | Details Get a Quote |
| SLC7A6 Knockout HeLa Cell Line | EDJ-KQ29183 | Human | 9057 | Details Get a Quote |
| SLC38A9 Knockout HCT 116 Cell Line | EDJ-KQ18230 | Human | 153129 | Details Get a Quote |
| NOS3 Knockout HCT 116 Cell Line | EDJ-KQ19625 | Human | 4846 | Details Get a Quote |
| SLC38A9 Knockout A-549 Cell Line | EDJ-KQ20362 | Human | 153129 | Details Get a Quote |
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Frequently Asked Questions About arginine binding
What is arginine binding?
Arginine binding is a molecular function (GO:0034618) defined as binding to the amino acid arginine (2-amino-5-(carbamimidamido)pentanoic acid). It is involved in many biological processes, including RNA catalysis, signal transduction, and transcriptional regulation.
What genes are involved in arginine binding?
Genes encoding arginine-binding proteins include FUS, NRP1, DosR, MIWI (PIWIL1), and CASTOR1, among others.
How does arginine binding regulate phase separation?
Arginine residues in proteins like FUS can engage in cation-pi interactions that drive phase separation. Methylation of these arginines disrupts these interactions and inhibits phase separation, which is relevant to neurodegenerative diseases.
What is the role of arginine binding in mTORC1 signaling?
The protein CASTOR1 binds arginine and interacts with GATOR2 to regulate mTORC1 activity in response to amino acid availability. This mechanism links arginine sensing to cell growth control.
Which diseases are associated with arginine binding?
Dysregulated arginine binding is implicated in cancer, neurodegeneration (e.g., ALS), infectious diseases (e.g., tuberculosis), and metabolic disorders.
How can CRISPR be used to study arginine binding?
CRISPR knockout, point mutation, knock-in, and overexpression models allow researchers to manipulate genes encoding arginine-binding proteins and study their functions in cells and animal models.
What methods are used to study arginine binding?
Common methods include X-ray crystallography, cryo-EM, isothermal titration calorimetry, surface plasmon resonance, CRISPR screens, RNA-seq, and proteomics.
What is the definition of GO:0034618?
GO:0034618 is the Gene Ontology term for arginine binding, defined as binding to 2-amino-5-(carbamimidamido)pentanoic acid.
Why is arginine binding important for RNA function?
Some RNA molecules, such as the Tetrahymena group I intron ribozyme, specifically bind arginine to facilitate catalysis, demonstrating the role of arginine in RNA enzymology.
How does arginine binding affect bacterial transcription?
In Mycobacterium bovis, the response regulator DosR binds to regulatory sequences of the arginine biosynthesis gene cluster, controlling gene expression in response to environmental signals.
Conclusion
Arginine binding (GO:0034618) is a fundamental molecular function with broad implications for cellular processes and human disease. From RNA catalysis to signal transduction and transcriptional regulation, the ability to specifically recognize arginine is critical for protein and RNA function. Dysregulation of arginine binding contributes to cancer, neurodegeneration, and infectious diseases, making it an attractive target for therapeutic intervention. Advances in structural biology, CRISPR-based models, and functional genomics are providing unprecedented insights into the mechanisms and roles of arginine binding. EDITGENE's comprehensive services can support researchers in generating precise cell models to study arginine-binding proteins and their associated pathways.
References
- 1. Qamar S et al.. 2018. FUS Phase Separation Is Modulated by a Molecular Chaperone and Methylation of Arginine Cation-π Interactions.. Cell 173(3):720-734.e15 PMID: 29677515
- 2. Mota F et al.. 2018. Architecture and hydration of the arginine-binding site of neuropilin-1.. FEBS J 285(7):1290-1304 PMID: 29430837
- 3. Cui Y et al.. 2022. DosR Regulates the Transcription of the Arginine Biosynthesis Gene Cluster by Binding to the Regulatory Sequences in Mycobacterium bovis Bacille Calmette-Guerin.. DNA Cell Biol 41(12):1063-1074 PMID: 36394437
- 4. Jing Y et al.. 2025. Lysine-arginine imbalance overcomes therapeutic tolerance governed by the transcription factor E3-lysosome axis in glioblastoma.. Nat Commun 16(1):2876 PMID: 40169552
- 5. Hu G et al.. 2022. Mechanistic Insight on General Protein-Binding Ability of ATP and the Impacts of Arginine Residues.. J Phys Chem B 126(25):4647-4658 PMID: 35713479
- 6. Vrettos N et al.. 2024. MIWI N-terminal arginines orchestrate generation of functional pachytene piRNAs and spermiogenesis.. Nucleic Acids Res 52(11):6558-6570 PMID: 38520410
- 7. Jansen RM et al.. 2025. Structural basis for mTORC1 regulation by the CASTOR1-GATOR2 complex.. Nat Struct Mol Biol 32(10):1980-1988 PMID: 40715445
- 8. Yarus M. 1989. Specificity of arginine binding by the Tetrahymena intron.. Biochemistry 28(3):980-8 PMID: 2653441
