GO:0030215 semaphorin receptor binding: Mechanism, Genes and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0030215 semaphorin receptor binding is a molecular function defined as binding to a semaphorin receptor, with synonyms including plexin binding and semaphorin receptor ligand.
• Semaphorins are a large family of secreted and membrane-bound proteins that signal through receptor complexes containing plexins, neuropilins, and other co-receptors.
• The best-characterized semaphorin-receptor interaction is SEMA3A binding to the NRP1/PLXNA complex, which regulates axon guidance and vascular patterning.
• Semaphorin receptor binding is not limited to the nervous system; it controls immune cell activation, tumor progression, and tissue repair.
• Dysregulated semaphorin-receptor interactions are implicated in cancers, immune disorders, and fibrotic diseases, making them attractive therapeutic targets.
• CRISPR-based knockout, point-mutation, knock-in, and overexpression models enable precise dissection of semaphorin receptor binding in health and disease.
Description
Semaphorins constitute a large family of secreted and membrane-associated proteins that were originally identified as axon guidance cues but are now recognized as pleiotropic regulators of cell migration, immune function, and tissue homeostasis. The molecular function that mediates their biological effects is captured by the Gene Ontology term GO:0030215, semaphorin receptor binding, which is defined as the binding to a semaphorin receptor. This term encompasses the direct physical interaction between a semaphorin ligand and its cognate receptor complex, which typically includes plexins and neuropilins, and is a prerequisite for downstream signal transduction. Researchers studying neurodevelopment, angiogenesis, cancer biology, and immunology increasingly focus on this interaction because it represents a nodal point for extracellular cues that control cell behavior. Understanding the structural and biochemical basis of semaphorin receptor binding is therefore essential for both basic biology and therapeutic development.
semaphorin receptor binding At A Glance
| GO ID | GO:0030215 |
|---|---|
| GO term | semaphorin receptor binding |
| Ontology | molecular_function |
| Synonym | plexin binding, plexin ligand, semaphorin receptor ligand |
| Major function | Binding to a semaphorin receptor, initiating downstream signaling |
| Major receptors | Plexins (PLXNA1-4, PLXNB1-3, PLXNC1, PLXND1) and neuropilins (NRP1, NRP2) |
| Major ligands | Semaphorins (SEMA3A-G, SEMA4A-D, SEMA5A-B, SEMA6A-D, SEMA7A) |
| Biological context | Axon guidance, immune regulation, angiogenesis, tumor progression |
| Disease relevance | Cancer, immune disorders, fibrosis, neurological disorders |
What Is GO:0030215?
GO:0030215 semaphorin receptor binding is a molecular function term describing the selective and non-covalent interaction of a semaphorin protein with a semaphorin receptor. This binding event is the initial step in semaphorin-mediated signaling and is required for receptor activation, which typically involves plexin family receptors and co-receptors such as neuropilins. The term is synonymous with plexin binding and semaphorin receptor ligand activity, reflecting the ligand-receptor nature of the interaction.
Why Is semaphorin receptor binding Important in Cell Biology?
Semaphorin receptor binding is a fundamental molecular event that translates extracellular semaphorin cues into intracellular signals controlling cell shape, motility, proliferation, and differentiation. Because this interaction is central to both developmental processes and adult tissue homeostasis, its dysregulation contributes to a wide range of pathologies, including cancer, autoimmune diseases, and fibrosis. Targeting semaphorin-receptor binding interfaces is therefore an active area of therapeutic development, and precise experimental models are needed to validate these interactions and their downstream effects.
• Controls axon guidance and neural circuit formation during development.
• Regulates immune cell activation and differentiation, including Th2 responses via SEMA4A-ILT-4.
• Modulates angiogenesis and vascular permeability through SEMA3A-NRP1/PLXNA signaling.
• Promotes perineural invasion and metastasis in pancreatic cancer.
• Involved in tissue repair and sensory innervation-mediated immunoregulation.
• Associated with hepatic fibrosis in metabolic dysfunction-associated steatotic liver disease (MASLD).
• Provides structural templates for drug design targeting semaphorin-receptor interfaces.
• Serves as a biomarker for disease progression, e.g., in membranous nephropathy.
• Enables high-throughput screening for modulators of semaphorin signaling.
• Facilitates CRISPR-based functional genomics of semaphorin pathways.
Molecular Mechanism of semaphorin receptor binding
Ligand-receptor recognition and binding
In simple terms: Semaphorin proteins stick to their specific receptors on the cell surface, like a key fitting a lock.
Semaphorin receptor binding begins with the recognition of a semaphorin ligand by its cognate receptor complex. The best-studied example is SEMA3A binding to the NRP1/PLXNA complex, where the semaphorin domain of SEMA3A directly engages the extracellular region of PLXNA and requires NRP1 as a co-receptor. Structural studies of the SEMA3A receptor binding module have revealed that the semaphorin domain forms a seven-bladed beta-propeller that presents a conserved binding interface for plexin. This interaction is highly specific and is governed by electrostatic and hydrophobic complementarity.
Receptor complex assembly and activation
In simple terms: Once the semaphorin binds, it brings together receptor subunits so they can send a signal inside the cell.
Binding of semaphorin to its receptor induces conformational changes and oligomerization of plexin receptors, which activates their intrinsic GTPase-activating protein (GAP) activity toward R-Ras and other small GTPases. For SEMA3A, the formation of a holoreceptor complex containing NRP1 and PLXNA is essential for signaling. This assembly step is a key regulatory node, as co-receptors and accessory molecules such as L1CAM and off-track can modulate the strength and specificity of the signal.
Structural determinants of binding specificity
In simple terms: The shape and chemical properties of the semaphorin and receptor determine which pairs can bind.
The specificity of semaphorin receptor binding is encoded in the semaphorin domain and the extracellular regions of plexins and neuropilins. Structural analysis of SEMA3A has shown that the receptor binding module is a compact beta-propeller with distinct loops that mediate high-affinity binding to PLXNA. In SEMA5A, glycosaminoglycan interactions modulate binding to receptors and extracellular matrix components, adding another layer of regulation. These structural features explain why different semaphorins exhibit distinct receptor preferences and biological activities.
Regulation by co-receptors and post-translational modifications
In simple terms: Helper proteins and chemical tags on the semaphorin or receptor can strengthen or weaken the binding.
Semaphorin receptor binding is modulated by co-receptors such as neuropilins, which are required for SEMA3 family signaling, and by post-translational modifications including glycosylation and proteolytic processing. For example, SEMA4A binding to ILT-4 on T cells drives Th2 responses, and this interaction can be influenced by the cellular context. Additionally, proteolytic cleavage of semaphorins can convert membrane-bound ligands into soluble forms with altered receptor binding properties.
Downstream signaling and functional outcomes
In simple terms: After binding, the receptor triggers a cascade of events that change how the cell behaves.
Upon semaphorin binding, plexin receptors transduce signals that lead to cytoskeletal rearrangements, growth cone collapse, and changes in cell adhesion and migration. In immune cells, SEMA4A binding to ILT-4 promotes Th2 differentiation and cytokine production. In cancer, semaphorin-receptor interactions can enhance perineural invasion and metastasis, as shown for pancreatic tumors. These diverse outcomes highlight the context-dependent nature of semaphorin receptor binding.
Key Genes Involved in GO:0030215 semaphorin receptor binding
The following genes encode the major semaphorin ligands and their receptors that participate in GO:0030215 semaphorin receptor binding.
| Gene | Major Role | Research Relevance |
|---|---|---|
| SEMA3A | Secreted semaphorin ligand; binds NRP1/PLXNA | Axon guidance, angiogenesis, cancer |
| SEMA4A | Transmembrane semaphorin; binds ILT-4 and plexins | Th2 immune responses, cancer |
| SEMA5A | Secreted semaphorin; binds plexins and GAGs | Neural development, cancer |
| SEMA6A | Transmembrane semaphorin; binds PLXNA2/PLXNA4 | Neural circuit formation |
| SEMA7A | GPI-anchored semaphorin; binds integrins and plexins | Immune regulation, tissue repair |
| PLXNA1 | Plexin A1 receptor for class 3 semaphorins | Axon guidance, cancer |
| PLXNA2 | Plexin A2 receptor for class 3 and 6 semaphorins | Neural development |
| PLXNA3 | Plexin A3 receptor | Axon guidance |
| PLXNA4 | Plexin A4 receptor | Neural development, cancer |
| PLXNB1 | Plexin B1 receptor for SEMA4D | Angiogenesis, cancer |
| PLXNB2 | Plexin B2 receptor | Immune regulation |
| PLXNC1 | Plexin C1 receptor for SEMA7A | Immune cell function |
| PLXND1 | Plexin D1 receptor for SEMA3E | Vascular development |
| NRP1 | Neuropilin-1 co-receptor for SEMA3A | Axon guidance, angiogenesis |
| NRP2 | Neuropilin-2 co-receptor for SEMA3B/C/F | Lymphatic development |
| ILT-4 | Immunoglobulin-like transcript 4 receptor for SEMA4A | Th2 responses |
| ITGB1 | Integrin beta-1 co-receptor for SEMA7A | Tissue repair |
How Is semaphorin receptor binding Regulated?
Semaphorin receptor binding is regulated at multiple levels, including ligand availability, receptor expression, and the presence of co-receptors. For instance, neuropilins are essential co-receptors for class 3 semaphorins, and their expression levels determine cellular responsiveness to SEMA3A. Post-translational modifications such as glycosaminoglycan attachment on SEMA5A can modulate its binding to receptors and extracellular matrix. Additionally, proteolytic cleavage can release soluble semaphorin ectodomains that act as diffusible ligands or decoys. In immune cells, SEMA4A binding to ILT-4 is regulated by the activation state of the cell. These regulatory mechanisms ensure that semaphorin signaling is tightly controlled in space and time.
semaphorin receptor binding and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| SEMA4A | Th2-mediated immune disorders | Knockout mouse or T cell-specific overexpression |
| SEMA3A | Cancer, angiogenesis | Xenograft models with SEMA3A knockdown |
| PLXNB1 | Cancer invasion | CRISPR knockout in cancer cell lines |
| SEMA7A | Tissue repair, fibrosis | Knock-in reporter for SEMA7A expression |
| SEMA5A | Neural development, cancer | Point mutation of GAG-binding sites |
Semaphorin receptor binding in cancer
Semaphorin-receptor interactions promote tumor progression, angiogenesis, and metastasis. SEMA3A binding to NRP1/PLXNA can either inhibit or promote tumor growth depending on context, while SEMA4D-PLXNB1 signaling enhances invasive growth. In pancreatic cancer, axon guidance molecules including semaphorins and plexins promote perineural invasion and metastasis. These findings suggest that targeting semaphorin receptor binding could be a therapeutic strategy in oncology.
Semaphorin receptor binding in immune disorders
SEMA4A binding to ILT-4 on T cells drives Th2 differentiation and is implicated in allergic and autoimmune diseases. Other semaphorins, such as SEMA7A, modulate immune cell migration and cytokine production through integrin and plexin receptors. Dysregulated semaphorin signaling can contribute to chronic inflammation and tissue damage.
Semaphorin receptor binding in fibrosis and tissue remodeling
Semaphorins are involved in fibrotic diseases, including hepatic fibrosis in MASLD, where a biomarker panel including semaphorin-related proteins was developed. SEMA7A promotes sensory innervation-mediated immunoregulation for tissue repair, highlighting its role in wound healing and fibrosis. These observations link semaphorin receptor binding to extracellular matrix remodeling and chronic tissue injury.
Semaphorin receptor binding in kidney disease
Membranous nephropathy, a common cause of nephrotic syndrome, involves autoantibodies against phospholipase A2 receptor and other targets, and semaphorin signaling may contribute to podocyte injury. Although direct evidence for semaphorin receptor binding in membranous nephropathy is limited, the broader involvement of semaphorins in kidney development and injury suggests a potential role.
From semaphorin receptor binding-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does loss of SEMA3A affect axon guidance? | SEMA3A knockout mouse or iPSC-derived neurons |
| How does SEMA4A-ILT-4 binding modulate Th2 responses? | ILT-4 knockout Jurkat cells or primary T cells |
| What is the role of PLXNB1 in cancer invasion? | PLXNB1 knockout in pancreatic cancer cell lines |
| Can a point mutation in SEMA5A alter GAG binding? | Knock-in of mutant SEMA5A in HEK293 cells |
| Does overexpression of SEMA7A enhance tissue repair? | Transgenic mouse with SEMA7A overexpression |
| How does NRP1 glycosylation affect SEMA3A binding? | Point mutation of NRP1 glycosylation sites |
How to Study the semaphorin receptor binding Process
| Method | What It Measures | Typical Application |
|---|---|---|
| Surface plasmon resonance | Binding affinity and kinetics | SEMA3A-NRP1 interaction |
| Co-immunoprecipitation | Physical interaction | SEMA4A-ILT-4 binding |
| X-ray crystallography | 3D structure of binding interface | SEMA3A receptor binding module |
| CRISPR knockout screen | Genes required for semaphorin signaling | Cancer cell migration |
| RNA-seq | Transcriptional changes upon binding | Th2 differentiation |
| Phosphoproteomics | Signaling events downstream of receptor activation | Plexin activation |
| Live-cell imaging | Dynamic receptor-ligand interactions | Growth cone collapse |
| ELISA | Soluble semaphorin levels | Biomarker discovery in MASLD |
Biochemical binding assays
Surface plasmon resonance (SPR) and isothermal titration calorimetry (ITC) can measure the affinity and kinetics of semaphorin-receptor interactions. Co-immunoprecipitation and pull-down assays using recombinant semaphorin domains and receptor ectodomains are standard for validating direct binding.
Structural biology
X-ray crystallography and cryo-electron microscopy have been used to solve the structure of the SEMA3A receptor binding module, revealing the molecular details of plexin engagement. These methods are essential for understanding how mutations affect binding specificity.
Cell-based signaling assays
Reporter assays, such as RhoA activation or growth cone collapse assays, can measure downstream signaling upon semaphorin receptor binding. Immune cell differentiation assays, such as Th2 cytokine production, are used to study SEMA4A-ILT-4 interactions.
CRISPR screening and functional genomics
Genome-wide CRISPR knockout screens can identify genes required for semaphorin receptor binding and downstream signaling. Pooled screens with semaphorin-induced phenotypes, such as cell migration or survival, enable unbiased discovery of novel pathway components.
How CRISPR Can Be Used to Study GO:0030215 semaphorin receptor binding
Knockout
CRISPR knockout of semaphorin ligands or receptors (e.g., SEMA3A, PLXNA1, NRP1) can abolish specific binding interactions and reveal their contribution to axon guidance, immune responses, and tumor growth. Knockout cell lines are valuable for validating antibody specificity and for drug screening.
Point Mutation
Point mutations can be introduced into semaphorin or receptor genes to disrupt specific binding interfaces without affecting protein expression. For example, mutating the GAG-binding site of SEMA5A can test its role in receptor binding. Such models are ideal for dissecting structure-function relationships.
Knock-in
Knock-in of epitope tags (e.g., HA, FLAG) or fluorescent proteins into endogenous semaphorin or receptor loci enables real-time tracking of protein localization and interaction. Knock-in of disease-associated mutations can model human disorders.
Overexpression
Overexpression of semaphorins or their receptors in cell lines or transgenic animals can enhance signaling and reveal gain-of-function phenotypes. For instance, SEMA7A overexpression promotes tissue repair and immunoregulation. Overexpression models are useful for identifying downstream effectors and for testing therapeutics.
How EDITGENE Supports semaphorin receptor binding Research
Researchers studying semaphorin receptor binding-related genes often need to determine whether a candidate gene is causally involved in a specific biological process or disease. EDITGENE provides a comprehensive suite of CRISPR-based services to generate precisely engineered cell models, enabling functional validation of semaphorin-receptor interactions with high confidence.
Contact EDITGENE today to design your custom CRISPR model for semaphorin receptor binding research.
Frequently Asked Questions About semaphorin receptor binding
What is GO:0030215 semaphorin receptor binding?
GO:0030215 is a Gene Ontology molecular function term defined as binding to a semaphorin receptor. It encompasses the physical interaction between semaphorin ligands and their receptors, such as plexins and neuropilins.
What genes are involved in semaphorin receptor binding?
Key genes include semaphorin ligands (SEMA3A, SEMA4A, SEMA5A, SEMA6A, SEMA7A) and receptors (PLXNA1-4, PLXNB1-3, PLXNC1, PLXND1, NRP1, NRP2, ILT-4).
How does semaphorin receptor binding work?
Semaphorin ligands bind to receptor complexes on the cell surface, inducing receptor oligomerization and activation of downstream signaling pathways that control cytoskeletal dynamics and gene expression.
What diseases are associated with semaphorin receptor binding?
Dysregulated semaphorin signaling is implicated in cancers, immune disorders, fibrosis, and neurological diseases.
What is the role of SEMA4A in immune responses?
SEMA4A binds to ILT-4 on T cells and drives Th2 differentiation, linking semaphorin receptor binding to allergic and autoimmune conditions.
How can I study semaphorin receptor binding using CRISPR?
CRISPR knockout, point mutation, knock-in, and overexpression models allow precise manipulation of semaphorin and receptor genes to test their function in binding and signaling.
What methods are used to measure semaphorin receptor binding?
Common methods include surface plasmon resonance, co-immunoprecipitation, X-ray crystallography, and cell-based signaling assays.
Is semaphorin receptor binding involved in cancer metastasis?
Yes, semaphorin-receptor interactions promote perineural invasion and metastasis in pancreatic cancer and other tumors.
What are the synonyms for GO:0030215?
Synonyms include plexin binding, plexin ligand, and semaphorin receptor ligand.
Can EDITGENE help with semaphorin receptor binding research?
Yes, EDITGENE provides custom CRISPR knockout, point mutation, knock-in, overexpression, library screening, and bioinformatics services for semaphorin-related genes.
Conclusion
GO:0030215 semaphorin receptor binding is a central molecular function that mediates diverse biological processes, from axon guidance to immune regulation and cancer progression. The interaction between semaphorins and their receptors is highly specific and tightly regulated, offering numerous opportunities for therapeutic intervention. CRISPR-based models are indispensable for dissecting these interactions and validating their roles in disease. EDITGENE's comprehensive services empower researchers to generate precise genetic models and accelerate discoveries in semaphorin biology.
References
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- 3. Verschuren L et al.. 2024. Development of a novel non-invasive biomarker panel for hepatic fibrosis in MASLD.. Nat Commun 15(1):4564 PMID: 38811591
- 4. Jurcak NR et al.. 2019. Axon Guidance Molecules Promote Perineural Invasion and Metastasis of Orthotopic Pancreatic Tumors in Mice.. Gastroenterology 157(3):838-850.e6 PMID: 31163177
- 5. Antipenko A et al.. 2003. Structure of the semaphorin-3A receptor binding module.. Neuron 39(4):589-98 PMID: 12925274
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