GO:0005005 transmembrane-ephrin receptor activity: Mechanism, Genes and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0005005 transmembrane-ephrin receptor activity is a molecular function defined as combining with a transmembrane ephrin to initiate a change in cell activity.
• Eph receptors are receptor tyrosine kinases that bind ephrin ligands, including transmembrane ephrin-B ligands, to mediate bidirectional signaling.
• Ephrin-A1 and ephrin-A4 act as ligands for the EphA8 receptor protein tyrosine kinase.
• Transmembrane ephrin-B ligands can undergo reverse endocytosis via a clathrin-mediated pathway, a key feature of Eph-ephrin biology.
• EphB4 receptor can regulate cell substrate adhesion in an ephrin-independent manner, showing context-dependent functions.
• Dysregulation of Eph-ephrin signaling is linked to cancer, kidney disease progression, and other pathologies [2,7].
Description
Transmembrane-ephrin receptor activity (GO:0005005) is a molecular function that enables a receptor to bind a transmembrane ephrin ligand and trigger intracellular signaling. This activity is central to Eph receptor tyrosine kinase signaling, which controls cell migration, adhesion, and tissue patterning. Eph receptors and their ephrin ligands are membrane-bound, allowing direct cell-to-cell communication. The term specifically refers to receptors that engage transmembrane ephrins, such as ephrin-B family members, rather than GPI-anchored ephrin-A ligands [5,8]. Understanding this activity is critical because Eph-ephrin interactions influence development, homeostasis, and disease [3,7]. For example, ephrin-A1 and ephrin-A4 bind the EphA8 receptor, while ephrin-B ligands can be internalized via clathrin-mediated endocytosis [3,5]. EphB4, a representative receptor, can also modulate cell substrate adhesion independently of ephrin binding. Recent proteomic and metabolomic studies have associated Eph-ephrin pathway components with kidney disease progression, highlighting their clinical relevance. Thus, GO:0005005 represents a key molecular interface for cell-cell communication and a target for therapeutic and research applications.
transmembrane-ephrin receptor activity At A Glance
| GO ID | GO:0005005 |
|---|---|
| GO term | transmembrane-ephrin receptor activity |
| Ontology | molecular_function |
| Synonym | transmembrane-Eph receptor activity |
| Definition | Combining with a transmembrane ephrin to initiate a change in cell activity. |
| Major function | Binding transmembrane ephrin ligands to initiate intracellular signaling |
| Related ligands | Ephrin-A1, ephrin-A4, ephrin-B family members [3,5] |
| Representative receptors | EphA8, EphB4 [3,7] |
| Signaling mode | Bidirectional signaling, often requiring cell-cell contact |
What Is GO:0005005?
According to QuickGO, transmembrane-ephrin receptor activity (GO:0005005) is defined as combining with a transmembrane ephrin to initiate a change in cell activity. In other words, it is the receptor-side function of binding a membrane-anchored ephrin ligand and transducing a signal across the plasma membrane. This activity is distinct from binding soluble ligands and is characteristic of Eph receptors that interact with ephrin-B ligands [5,8].
Why Is transmembrane-ephrin receptor activity Important in Cell Biology?
Transmembrane-ephrin receptor activity is important because it governs fundamental processes such as cell migration, adhesion, and tissue boundary formation. Dysregulation of this activity contributes to cancer progression, where Eph receptors can promote or suppress tumor growth depending on context. In kidney disease, integrated proteomic and metabolomic modules including Eph-ephrin components associate with disease progression. Moreover, the reverse endocytosis of transmembrane ephrin-B ligands via clathrin-mediated pathways reveals a mechanism for signal termination and recycling. Therefore, studying GO:0005005 provides insights into both normal physiology and disease pathogenesis.
• Controls cell-cell communication through direct membrane-membrane contact.
• Regulates cell migration and adhesion during development.
• Mediates bidirectional signaling between Eph receptor-expressing and ephrin-expressing cells.
• Involved in cancer progression, including tumor angiogenesis and metastasis.
• Associated with kidney disease progression in proteomic/metabolomic studies.
• Ephrin-A1 and ephrin-A4 act as ligands for EphA8, affecting neuronal and other tissues.
• Transmembrane ephrin-B ligands undergo reverse endocytosis, modulating signaling duration.
• EphB4 can regulate cell substrate adhesion independently of ephrin binding.
• Potential target for therapeutic antibodies and imaging agents [1,4,6].
• Provides a model for studying receptor tyrosine kinase specificity and signaling.
Molecular Mechanism of transmembrane-ephrin receptor activity
Ligand Binding and Receptor Activation
In simple terms: The receptor grabs a transmembrane ephrin on another cell, which turns the receptor on.
Transmembrane-ephrin receptor activity begins with the binding of a transmembrane ephrin ligand, such as ephrin-B, to the extracellular domain of an Eph receptor. This interaction typically requires direct cell-cell contact because both receptor and ligand are membrane-anchored. Upon binding, Eph receptors undergo clustering and autophosphorylation, initiating intracellular signaling cascades. Ephrin-A1 and ephrin-A4 can also bind EphA8, demonstrating ligand diversity.
Bidirectional Signaling
In simple terms: Both the receptor-bearing cell and the ephrin-bearing cell receive signals.
Eph-ephrin interactions are unique because they can trigger bidirectional signaling: forward signaling through the Eph receptor and reverse signaling through the ephrin ligand. This bidirectional communication is essential for processes like axon guidance and tissue patterning. The transmembrane nature of ephrin-B ligands allows them to act as signaling molecules themselves.
Reverse Endocytosis of Ephrin-B
In simple terms: The ephrin ligand can be pulled into the cell via a coated pit mechanism.
Transmembrane ephrin-B ligands can undergo reverse endocytosis via a clathrin-mediated pathway. This process internalizes the ligand-receptor complex, which can attenuate signaling and recycle components. This endocytic mechanism is a key regulatory step in transmembrane-ephrin receptor activity.
Ephrin-Independent Functions of EphB4
In simple terms: Some Eph receptors can also work without ephrin ligands.
EphB4 receptor can regulate cell substrate adhesion independently of ephrin binding. This ephrin-independent function highlights that transmembrane-ephrin receptor activity is not the only role of Eph receptors. Such context-dependent functions may contribute to disease processes.
Key Genes Involved in GO:0005005 transmembrane-ephrin receptor activity
The following genes and proteins are directly implicated in transmembrane-ephrin receptor activity and its downstream effects.
| Gene | Major Role | Research Relevance |
|---|---|---|
| EPHA8 | Receptor tyrosine kinase that binds ephrin-A1 and ephrin-A4 | Studying ligand specificity and neuronal signaling |
| EPHB4 | Receptor that can regulate cell substrate adhesion independently of ephrin | Cancer and vascular biology research |
| EFNA1 | Ephrin-A1 ligand for EphA8 | Ligand-receptor interaction studies |
| EFNA4 | Ephrin-A4 ligand for EphA8 | Ligand-receptor interaction studies |
| EFNB1 | Transmembrane ephrin-B ligand, subject to reverse endocytosis | Cell-cell communication and endocytosis research |
| EFNB2 | Transmembrane ephrin-B ligand | Bidirectional signaling studies |
| EFNB3 | Transmembrane ephrin-B ligand | Bidirectional signaling studies |
| EPHA1 | Eph receptor family member | General Eph-ephrin signaling |
| EPHA2 | Eph receptor family member | Cancer and development |
| EPHA3 | Eph receptor family member | Neuronal and cancer research |
| EPHA4 | Eph receptor family member | Axon guidance |
| EPHA5 | Eph receptor family member | Neuronal development |
| EPHA6 | Eph receptor family member | Neuronal development |
| EPHA7 | Eph receptor family member | Neuronal development |
| EPHB1 | Eph receptor family member | Bidirectional signaling |
| EPHB2 | Eph receptor family member | Cancer and development |
| EPHB3 | Eph receptor family member | Intestinal homeostasis |
| EPHB6 | Eph receptor family member | Cell adhesion |
How Is transmembrane-ephrin receptor activity Regulated?
Transmembrane-ephrin receptor activity is regulated at multiple levels. Ligand binding induces receptor clustering and autophosphorylation, which is required for downstream signaling. Reverse endocytosis of ephrin-B via clathrin-mediated pathways can terminate signaling and recycle receptors. Additionally, EphB4 can function independently of ephrin binding, suggesting that its activity is modulated by other cellular contexts. Proteomic and metabolomic studies have linked Eph-ephrin pathway components to kidney disease progression, indicating that systemic metabolic changes may influence this activity.
transmembrane-ephrin receptor activity and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| EPHB4 | Cancer, cell adhesion | Knockout or overexpression in cancer cell lines |
| EPHA8 | Neuronal signaling, cancer | Point mutation to disrupt ligand binding |
| EFNB1 | Cell-cell communication, endocytosis | Knock-in of tagged ephrin-B1 for imaging |
| EFNA1 | Angiogenesis, cancer | Overexpression in endothelial cells |
| EPHB4 | Kidney disease progression | Knockout in renal epithelial cells |
Cancer
Eph receptors and ephrins are frequently dysregulated in cancer. EphB4 can regulate cell substrate adhesion independently of ephrin, contributing to tumor cell migration and invasion. Ephrin-A1 and ephrin-A4, as ligands for EphA8, may influence tumor angiogenesis and progression. Targeting transmembrane-ephrin receptor activity is a potential therapeutic strategy.
Kidney Disease Progression
Integrated proteomic and metabolomic analyses have associated modules containing Eph-ephrin signaling components with risk of kidney disease progression. This suggests that transmembrane-ephrin receptor activity may play a role in renal pathophysiology.
Neurological Disorders
Eph-ephrin signaling is critical for axon guidance and neural development. Disruption of transmembrane-ephrin receptor activity could contribute to neurological disorders, although specific disease links require further study.
From transmembrane-ephrin receptor activity-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does loss of EphB4 affect cell adhesion? | EPHB4 knockout cell line |
| Does ephrin-A1 binding to EphA8 require specific residues? | EPHA8 point mutation |
| Can ephrin-B1 reverse endocytosis be tracked? | Knock-in of fluorescently tagged EFNB1 |
| Does overexpression of EphA8 alter migration? | EPHA8 overexpression |
| Is EphB4 ephrin-independent function conserved? | Ephrin-binding deficient EphB4 mutant |
| What is the role of ephrin-B2 in bidirectional signaling? | EFNB2 knockout |
How to Study the transmembrane-ephrin receptor activity Process
| Method | What It Measures | Typical Application |
|---|---|---|
| Surface plasmon resonance | Binding affinity between Eph and ephrin | Ligand specificity studies |
| Fluorescence microscopy | Endocytosis of ephrin-B | Reverse endocytosis dynamics |
| Western blot | Eph receptor phosphorylation | Receptor activation |
| Proteomics | Protein modules associated with disease | Kidney disease progression |
| Metabolomics | Metabolite changes linked to Eph-ephrin | Kidney disease progression |
| Co-immunoprecipitation | Eph-ephrin complex formation | Bidirectional signaling |
| Live-cell imaging | Cell-cell contact and signaling | Neuronal guidance |
Binding Assays
Receptor-ligand binding assays, such as surface plasmon resonance or ELISA, can measure the affinity between Eph receptors and transmembrane ephrins. These assays help characterize the specificity of interactions, e.g., ephrin-A1 and ephrin-A4 with EphA8.
Endocytosis Assays
Clathrin-mediated endocytosis of ephrin-B can be studied using fluorescently labeled ligands and imaging. This reveals the dynamics of reverse endocytosis and its role in signal termination.
Phosphorylation Analysis
Western blotting with phospho-tyrosine antibodies can detect Eph receptor autophosphorylation upon ligand binding. This is a direct readout of transmembrane-ephrin receptor activity.
Proteomics and Metabolomics
Integrated proteomic and metabolomic profiling can identify modules associated with Eph-ephrin signaling in disease cohorts. This approach links transmembrane-ephrin receptor activity to systemic metabolic changes.
How CRISPR Can Be Used to Study GO:0005005 transmembrane-ephrin receptor activity
Knockout
CRISPR knockout of Eph receptor genes such as EPHB4 can abolish transmembrane-ephrin receptor activity, revealing its role in cell adhesion and migration. Knockout of ephrin ligands like EFNB1 can also disrupt bidirectional signaling.
Point Mutation
Point mutations in the ligand-binding domain of Eph receptors can specifically disrupt ephrin binding without affecting other functions. This helps dissect the contribution of transmembrane-ephrin receptor activity to cellular phenotypes.
Knock-in
Knock-in of tagged ephrin-B or Eph receptors allows real-time tracking of endocytosis and signaling. This approach can visualize reverse endocytosis in live cells.
Overexpression
Overexpression of EphA8 or ephrin-A1 can enhance transmembrane-ephrin receptor activity and downstream signaling. This is useful for gain-of-function studies in cancer and development.
How EDITGENE Supports transmembrane-ephrin receptor activity Research
Researchers studying transmembrane-ephrin receptor activity-related genes often need to determine whether a candidate gene is causally involved in signaling, adhesion, or disease. EDITGENE provides comprehensive CRISPR-based services to accelerate this research.
Contact EDITGENE today to design your custom CRISPR model for transmembrane-ephrin receptor activity research.
Frequently Asked Questions About transmembrane-ephrin receptor activity
What is transmembrane-ephrin receptor activity?
It is a molecular function defined as combining with a transmembrane ephrin to initiate a change in cell activity, corresponding to GO:0005005.
What genes are involved in transmembrane-ephrin receptor activity?
Key genes include EPHA8, EPHB4, EFNA1, EFNA4, and ephrin-B family members such as EFNB1, EFNB2, and EFNB3 [3,5,7].
Which GO term describes transmembrane-ephrin receptor activity?
GO:0005005 is the official GO ID for transmembrane-ephrin receptor activity.
What is the synonym for transmembrane-ephrin receptor activity?
The synonym is transmembrane-Eph receptor activity.
How does ephrin-B undergo reverse endocytosis?
Transmembrane ephrin-B ligands can be internalized via a clathrin-mediated pathway, which regulates signaling.
Can EphB4 function without ephrin binding?
Yes, EphB4 can regulate cell substrate adhesion independently of ephrin binding.
What diseases are linked to transmembrane-ephrin receptor activity?
It is linked to cancer, kidney disease progression, and neurological disorders [2,7,8].
What experimental models study transmembrane-ephrin receptor activity?
Knockout, point mutation, knock-in, and overexpression cell models are commonly used [3,5,7].
How can I study ephrin-A1 and EphA8 interaction?
Binding assays and point mutations in EPHA8 can characterize the interaction with ephrin-A1.
What services does EDITGENE offer for Eph-ephrin research?
EDITGENE provides knockout, point mutation, knock-in, overexpression cell models, CRISPR library screening, and bioinformatics [2,3,5,7,8].
Conclusion
Transmembrane-ephrin receptor activity (GO:0005005) is a fundamental molecular function that mediates cell-cell communication through Eph receptor and transmembrane ephrin interactions. Its roles in development, cancer, and kidney disease make it a critical research focus [2,7]. Understanding its mechanism, regulation, and disease links requires robust experimental models [3,5]. EDITGENE offers a full suite of CRISPR services to support such studies.
References
- 1. Leung K. 2004. (64)Cu-Tetraazacyclododecane-N,N',N'',N'''-tetraacetic acid-TNYLFSPNGPIARAW (TNYL-RAW).. PMID: 22206105
- 2. Schlosser P et al.. 2024. Association of Integrated Proteomic and Metabolomic Modules with Risk of Kidney Disease Progression.. J Am Soc Nephrol 35(7):923-935 PMID: 38640019
- 3. Choi S et al.. 1999. Characterization of ephrin-A1 and ephrin-A4 as ligands for the EphA8 receptor protein tyrosine kinase.. Mol Cells 9(4):440-5 PMID: 10515610
- 4. Leung K. 2004. Cy5.5-Anti-ephrin receptor B4 (EphB4) humanized monoclonal antibody hAb47.. PMID: 23678520
- 5. Parker M et al.. 2004. Reverse endocytosis of transmembrane ephrin-B ligands via a clathrin-mediated pathway.. Biochem Biophys Res Commun 323(1):17-23 PMID: 15351694
- 6. Leung K. 2004. (111)In-Labeled-TNYLFSPNGPIARAW (TNYL-RAW)-polyethylene glycol–coated core-cross-linked polymeric micelle-Cy7.. PMID: 22279635
- 7. Noren NK et al.. 2009. Ephrin-independent regulation of cell substrate adhesion by the EphB4 receptor.. Biochem J 422(3):433-42 PMID: 19552627
- 8. Brückner K et al.. 1998. Signaling by Eph receptors and their ephrin ligands.. Curr Opin Neurobiol 8(3):375-82 PMID: 9687349
