GO:0046875 ephrin receptor binding: Mechanism, Genes and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0046875 ephrin receptor binding is a molecular function defined as binding to an ephrin receptor, encompassing interactions with both GPI-linked and transmembrane ephrins.
• Ephrin receptor binding is the first step in Eph receptor signaling, which controls cell migration, repulsion, adhesion, and tissue boundary formation.
• The interaction is bidirectional: ephrin binding activates the Eph receptor and also triggers reverse signaling in the ephrin-expressing cell.
• Ephrin receptor binding is implicated in angiogenesis and lymphangiogenesis through ephrin-B2 and VEGF crosstalk.
• EphA2, a key ephrin receptor, serves as an epithelial entry receptor for Epstein-Barr virus, and this entry can be blocked by IFITM1.
• Structural and inhibitor studies have revealed druggable pockets in Eph receptor kinase and ligand-binding domains, enabling targeted chemical biology.
Description
Ephrin receptor binding (GO:0046875) is a molecular function that describes the physical interaction between a protein and an ephrin receptor, a member of the Eph family of receptor tyrosine kinases. This binding event is the initiating step for Eph-ephrin signaling, a cell-cell communication system that regulates diverse developmental and homeostatic processes, including axon guidance, vascular assembly, and epithelial organization. Because ephrin binding is required for Eph receptor activation, it is a central node for understanding how cells interpret positional cues and how dysregulation contributes to disease. Researchers study ephrin receptor binding to dissect mechanisms of angiogenesis, viral entry, and tumor progression, and to develop inhibitors that modulate Eph receptor activity. The availability of structural data on EphA2 ligand-binding domains and pseudokinase domains has further advanced the design of chemical probes and therapeutic candidates.
ephrin receptor binding At A Glance
| GO ID | GO:0046875 |
|---|---|
| GO term | ephrin receptor binding |
| Ontology | molecular_function |
| Synonym | Eph receptor binding; ephrin; GPI-linked ephrin; transmembrane ephrin |
| Major function | Binding to an ephrin receptor, initiating Eph receptor signaling and bidirectional cell-cell communication |
| Biological context | Cell migration, repulsion, adhesion, angiogenesis, lymphangiogenesis, and viral entry |
| Structural features | Involves ligand-binding domains of Eph receptors and juxtamembrane regions that modulate conformational heterogeneity |
| Disease relevance | Cancer, vascular disorders, and Epstein-Barr virus infection |
What Is GO:0046875?
According to the Gene Ontology, ephrin receptor binding (GO:0046875) is the molecular function of binding to an ephrin receptor. This includes interactions with ephrin receptors such as EphA and EphB family members, and the binding partner may be a GPI-linked ephrin or a transmembrane ephrin. The term captures the direct physical contact between a ligand or protein and an ephrin receptor, which is a prerequisite for downstream receptor activation and signaling.
Why Is ephrin receptor binding Important in Cell Biology?
Ephrin receptor binding is important because it governs the initial molecular recognition event that determines whether Eph receptor signaling is activated or suppressed. This binding event controls fundamental processes such as cell repulsion and adhesion during development, and its dysregulation is linked to pathological angiogenesis, tumor invasion, and susceptibility to viral infection. Understanding ephrin receptor binding at atomic and cellular resolution provides a basis for designing inhibitors and for interpreting how mutations in Eph receptors or ephrins alter signaling output.
• Initiates Eph receptor signaling, which regulates cell migration, repulsion, and adhesion.
• Controls angiogenesis and lymphangiogenesis through ephrin-B2 and VEGF crosstalk.
• Mediates Epstein-Barr virus entry into epithelial cells via EphA2.
• Can be blocked by host factors such as IFITM1, linking binding to antiviral defense.
• Provides structural targets for pan-ephrin receptor kinase inhibitors.
• Involves conformational heterogeneity in EphA2 ligand-binding domains that affects binding affinity.
• Pseudokinase domains of Eph receptors contribute to signaling complex assembly.
• Dysregulation is associated with cancer progression and vascular disease.
• Enables bidirectional signaling between opposing cells.
• Supports development of chemical probes for Eph receptor biology.
Molecular Mechanism of ephrin receptor binding
Ligand recognition and binding interface
In simple terms: The ephrin ligand docks onto a specific pocket on the Eph receptor, like a key fitting a lock.
Ephrin receptor binding begins with the engagement of an ephrin ligand with the extracellular ligand-binding domain of an Eph receptor. Structural studies of the EphA2 ligand-binding domain have mapped the residues involved in ephrin A1 recognition and revealed that conformational heterogeneity and juxtamembrane regions influence the binding interface. This initial recognition event is highly specific and determines downstream signaling outcomes.
Receptor dimerization and clustering
In simple terms: Once the ligand binds, multiple receptor molecules group together to send a signal.
After ephrin binding, Eph receptors undergo dimerization and higher-order clustering in the plasma membrane. Eph receptor signaling complexes assemble in membrane microdomains, and this clustering is essential for efficient activation. The pseudokinase domains of Eph receptors can participate in these complexes, contributing to allosteric regulation and signal propagation.
Bidirectional signaling
In simple terms: Both the receptor-bearing cell and the ephrin-bearing cell receive signals.
Ephrin receptor binding triggers bidirectional signaling: forward signaling through the Eph receptor kinase domain and reverse signaling through the ephrin ligand, which can be GPI-linked or transmembrane. This bidirectional communication is critical for cell repulsion and adhesion during tissue patterning.
Kinase activation and downstream phosphorylation
In simple terms: The receptor's kinase domain turns on and adds phosphate tags to itself and other proteins.
Binding-induced clustering activates the Eph receptor tyrosine kinase domain, leading to autophosphorylation and phosphorylation of downstream effectors. Pan-ephrin receptor kinase inhibitors have been developed to block this catalytic step, demonstrating the druggability of the kinase domain. The juxtamembrane region plays a regulatory role in controlling kinase activity.
Modulation by host factors and inhibitors
In simple terms: Other proteins can interfere with ephrin binding, either to block viruses or to tune signaling.
Ephrin receptor binding can be competitively blocked by host proteins such as IFITM1, which prevents EphA2-mediated Epstein-Barr virus entry into epithelial cells. Small-molecule inhibitors targeting Eph receptor kinases also modulate downstream signaling by interfering with activation steps that follow ephrin binding.
Key Genes Involved in GO:0046875 ephrin receptor binding
The following genes and proteins are central to ephrin receptor binding and its downstream biology.
| Gene | Major Role | Research Relevance |
|---|---|---|
| EPHA2 | Ephrin receptor A2; binds ephrin-A ligands and serves as EBV entry receptor | Target for viral entry studies and cancer therapy |
| EPHB2 | Ephrin receptor B2; regulates cell migration and angiogenesis | Model for vascular development and tumor invasion |
| EPHB4 | Ephrin receptor B4; controls lymphangiogenesis | Studied in lymphatic vessel formation |
| EFNB2 | Ephrin-B2 ligand; binds EphB receptors and regulates VEGF crosstalk | Key gene in angiogenesis and lymphangiogenesis |
| EFNA1 | Ephrin-A1 ligand; binds EphA2 | Structural and functional studies of EphA2 binding |
| EFNA5 | Ephrin-A5; involved in axon guidance and cell repulsion | Model for ephrin receptor binding specificity |
| IFITM1 | Interferon-induced transmembrane protein-1; blocks EphA2-mediated EBV entry | Antiviral defense and competitive binding studies |
| VEGFA | Vascular endothelial growth factor A; crosstalks with ephrin-B2 signaling | Angiogenesis research |
| KDR | VEGFR2; interacts with ephrin-B2 pathway | Vascular signaling models |
| EPHA4 | Ephrin receptor A4; regulates neural development | Axon guidance and synaptic studies |
| EPHB1 | Ephrin receptor B1; involved in cell adhesion | Cell migration assays |
| EPHB3 | Ephrin receptor B3; regulates epithelial organization | Tissue boundary formation |
| EPHB6 | Ephrin receptor B6; pseudokinase domain studied | Structural insights into pseudokinase domains |
| EFNB1 | Ephrin-B1; transmembrane ligand for EphB receptors | Bidirectional signaling research |
| EFNB3 | Ephrin-B3; regulates neural circuit formation | Neural development models |
| EPHA1 | Ephrin receptor A1; epithelial cell functions | Cancer and epithelial biology |
| EPHA3 | Ephrin receptor A3; regulates cell adhesion | Tumor suppressor studies |
How Is ephrin receptor binding Regulated?
Ephrin receptor binding is regulated at multiple levels. Conformational heterogeneity in the EphA2 ligand-binding domain and juxtamembrane regions modulates binding affinity and selectivity. Receptor clustering in the plasma membrane is influenced by lipid composition and protein-protein interactions, which can enhance or dampen signaling. Host factors such as IFITM1 can competitively block ephrin receptor binding, providing a regulatory mechanism during viral infection. Additionally, kinase inhibitors can interfere with post-binding activation steps, effectively regulating downstream signaling.
ephrin receptor binding and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| EPHB4/EFNB2 | Angiogenesis and lymphangiogenesis disorders | Endothelial cell knockout and overexpression models |
| EPHA2 | Epstein-Barr virus infection and epithelial cancers | EphA2 knockout epithelial cells and viral entry assays |
| EPHA2 | Cancer cell migration and invasion | Point-mutation knock-in of ligand-binding domain residues |
| EPHB6 | Pseudokinase-mediated signaling in cancer | Kinase-dead and pseudokinase domain mutants |
| EPHA4 | Neurological disorders and axon guidance defects | Neuronal knockout and rescue models |
Ephrin receptor binding in angiogenesis and vascular disease
Ephrin-B2 controls VEGF-induced angiogenesis and lymphangiogenesis, and disruption of this pathway leads to defective vascular development. Because ephrin receptor binding initiates EphB4 signaling in endothelial cells, targeting this interaction is a strategy for modulating pathological angiogenesis.
Ephrin receptor binding and Epstein-Barr virus infection
EphA2 acts as an epithelial cell receptor for Epstein-Barr virus entry, and ephrin receptor binding is the initial step for viral attachment. IFITM1 competitively blocks EphA2-mediated EBV entry, highlighting a host defense mechanism that interferes with ephrin receptor binding.
Ephrin receptor binding in cancer
Dysregulated Eph receptor signaling is associated with tumor progression, and pan-ephrin receptor kinase inhibitors have been identified using DNA-encoded chemistry technology. Structural studies of EphA2 ligand-binding domains support the design of inhibitors that block ephrin binding or downstream activation.
From ephrin receptor binding-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does loss of ephrin receptor binding affect angiogenesis? | EPHB4 or EFNB2 knockout endothelial cells |
| Which residues mediate ephrin-A1 binding to EphA2? | Point-mutation knock-in of EphA2 ligand-binding domain |
| Can a tagged Eph receptor track binding dynamics? | Knock-in of fluorescent or epitope tag at endogenous locus |
| Does overexpression of ephrin-B2 enhance VEGF signaling? | Ephrin-B2 overexpression in endothelial cells |
| Can IFITM1 block EphA2-mediated viral entry? | IFITM1 overexpression and EphA2 knockout cells |
| Do pan-ephrin inhibitors block kinase activation? | Kinase domain point mutants and inhibitor treatment |
How to Study the ephrin receptor binding Process
| Method | What It Measures | Typical Application |
|---|---|---|
| NMR spectroscopy | Residue-level binding interface and dynamics | EphA2 ligand-binding domain assignment |
| X-ray crystallography | Three-dimensional structure of ephrin-receptor complexes | Juxtamembrane conformational changes |
| Surface plasmon resonance | Binding affinity and kinetics | Ephrin-Eph receptor interaction studies |
| Co-immunoprecipitation | Physical association in cell lysates | Validation of ephrin receptor binding partners |
| Phospho-immunoblotting | Receptor autophosphorylation | Downstream signaling after ephrin binding |
| Viral entry assay | EBV infection efficiency | EphA2-mediated entry and IFITM1 blockade |
| DNA-encoded library screening | Identification of kinase inhibitors | Pan-ephrin receptor inhibitor discovery |
| Pseudokinase domain assays | Allosteric regulation of signaling complexes | EphB6 and related pseudokinase studies |
Structural biology of ephrin receptor binding
NMR resonance assignment of the EphA2 ligand-binding domain enables mapping of the ephrin binding interface at atomic resolution. X-ray crystallography and cryo-EM can reveal conformational changes in the juxtamembrane region upon ephrin binding.
Biochemical binding assays
Surface plasmon resonance, isothermal titration calorimetry, and co-immunoprecipitation are used to measure affinity and specificity of ephrin receptor binding. These assays can be combined with mutagenesis to validate binding residues.
Cell-based signaling assays
Phosphorylation-specific antibodies and luciferase reporters measure Eph receptor activation downstream of ephrin binding. Viral entry assays using EphA2-expressing cells quantify the functional consequence of ephrin receptor binding for EBV infection.
Chemical biology and inhibitor screening
DNA-encoded chemistry technology has been used to identify pan-ephrin receptor kinase inhibitors, which can be tested in binding and signaling assays. These compounds help dissect the contribution of kinase activity versus binding events.
How CRISPR Can Be Used to Study GO:0046875 ephrin receptor binding
Knockout
CRISPR knockout of EPHA2, EPHB4, or EFNB2 eliminates ephrin receptor binding and downstream signaling, enabling loss-of-function studies in angiogenesis and viral entry. Knockout models are essential for validating whether a candidate gene is causally involved in ephrin receptor binding-dependent phenotypes.
Point Mutation
Point mutations in the EphA2 ligand-binding domain can disrupt specific ephrin contacts while preserving receptor folding, allowing precise mapping of binding residues. Such models help distinguish binding-dependent from kinase-dependent functions.
Knock-in
Knock-in of epitope tags or fluorescent proteins at endogenous Eph receptor loci enables real-time tracking of ephrin receptor binding and trafficking in live cells. Knock-in of disease-associated mutations can model altered binding affinity.
Overexpression
Overexpression of ephrin-B2 or EphA2 enhances ephrin receptor binding and amplifies downstream signaling, useful for gain-of-function studies in angiogenesis and viral entry. Overexpression of IFITM1 can competitively block EphA2-mediated EBV entry.
How EDITGENE Supports ephrin receptor binding Research
Researchers studying ephrin receptor binding-related genes often need to determine whether a candidate gene is causally involved in binding, signaling, or disease phenotypes. EDITGENE provides a comprehensive suite of CRISPR-based cell model services to accelerate this discovery process.
Contact EDITGENE today to design your custom CRISPR model for ephrin receptor binding research.
Frequently Asked Questions About ephrin receptor binding
What is ephrin receptor binding?
Ephrin receptor binding (GO:0046875) is the molecular function of binding to an ephrin receptor, initiating Eph receptor signaling and bidirectional cell-cell communication.
What genes are involved in ephrin receptor binding?
Key genes include EPHA2, EPHB2, EPHB4, EFNB2, EFNA1, and IFITM1, among others.
What is the GO ID for ephrin receptor binding?
The Gene Ontology ID for ephrin receptor binding is GO:0046875.
How does ephrin receptor binding trigger signaling?
Binding induces receptor dimerization and clustering, leading to kinase activation and downstream phosphorylation.
What diseases are linked to ephrin receptor binding?
It is linked to angiogenesis disorders, cancer progression, and Epstein-Barr virus infection.
Can ephrin receptor binding be blocked?
Yes, host factors like IFITM1 and small-molecule kinase inhibitors can interfere with ephrin receptor binding or downstream activation.
What is the structure of the EphA2 ligand-binding domain?
NMR and crystallography studies have revealed the fold and conformational heterogeneity of the EphA2 ligand-binding domain.
How is ephrin receptor binding studied experimentally?
Methods include NMR, surface plasmon resonance, co-immunoprecipitation, and viral entry assays.
What are the synonyms for ephrin receptor binding?
Synonyms include Eph receptor binding, ephrin, GPI-linked ephrin, and transmembrane ephrin.
Why is ephrin receptor binding important for angiogenesis?
Ephrin-B2 controls VEGF-induced angiogenesis and lymphangiogenesis, making ephrin receptor binding a key regulatory node.
Conclusion
Ephrin receptor binding (GO:0046875) is a fundamental molecular function that initiates Eph receptor signaling and controls diverse biological processes, from angiogenesis to viral entry. Structural and chemical biology advances have illuminated the binding interface and enabled inhibitor development. CRISPR-based models are indispensable for dissecting the causal roles of ephrin receptor binding genes in health and disease.
References
- 1. Wang Y et al.. 2010. Ephrin-B2 controls VEGF-induced angiogenesis and lymphangiogenesis.. Nature 465(7297):483-6 PMID: 20445537
- 2. Zhang H et al.. 2018. Ephrin receptor A2 is an epithelial cell receptor for Epstein-Barr virus entry.. Nat Microbiol 3(2):1-8 PMID: 29292383
- 3. Madasu C et al.. 2024. Identification of potent pan-ephrin receptor kinase inhibitors using DNA-encoded chemistry technology.. Proc Natl Acad Sci U S A 121(19):e2322934121 PMID: 38701119
- 4. Mineev KS et al.. 2025. NMR resonance assignment of a ligand-binding domain of ephrin receptor A2.. Biomol NMR Assign 19(1):23-28 PMID: 39695021
- 5. Mineev KS et al.. 2025. Structural Role of Conformational Heterogeneity and Juxtamembrane Regions in the Ephrin A1 Interactions With the EphA2 Receptor Ligand-binding Domain.. J Mol Biol 437(24):169454 PMID: 40998111
- 6. Pasquale EB. 2024. Eph receptor signaling complexes in the plasma membrane.. Trends Biochem Sci 49(12):1079-1096 PMID: 39537538
- 7. Yang Y et al.. 2024. Interferon-induced transmembrane protein-1 competitively blocks Ephrin receptor A2-mediated Epstein-Barr virus entry into epithelial cells.. Nat Microbiol 9(5):1256-1270 PMID: 38649412
- 8. Sheetz JB et al.. 2020. Structural Insights into Pseudokinase Domains of Receptor Tyrosine Kinases.. Mol Cell 79(3):390-405.e7 PMID: 32619402
