GO:0005115 receptor tyrosine kinase-like orphan receptor binding: Mechanism, Genes and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0005115 describes the molecular function of binding to a receptor tyrosine kinase-like orphan receptor (Ror), a family of single-pass transmembrane proteins with an extracellular domain and an intracellular tyrosine kinase-like domain.
• Ror proteins, particularly ROR1 and ROR2, are pseudokinases that lack canonical kinase activity but serve as critical signaling hubs in Wnt5a-dependent non-canonical Wnt signaling.
• ROR1 and ROR2 are overexpressed in multiple cancers, including lung squamous cell carcinoma, and are emerging as attractive targets for antibody-drug conjugates, bispecific T-cell engagers, and PROTACs.
• The binding function is essential for cytoneme-mediated transport of active Wnt5b-Ror2 complexes, a mechanism for long-range signaling during embryonic development.
• Research tools for studying GO:0005115 include knockout and knock-in cell models, structural biology of pseudokinase domains, and proteogenomic profiling of ROR-expressing tumors.
• EDITGENE provides CRISPR-based services to dissect the causal roles of ROR1, ROR2, and their binding partners in development and disease.
Description
GO:0005115, receptor tyrosine kinase-like orphan receptor binding, is a molecular function term that defines the physical interaction between a ligand or protein and a member of the Ror family of receptor tyrosine kinases. The Ror family comprises ROR1 and ROR2 in humans, which are type I transmembrane proteins characterized by an extracellular immunoglobulin-like domain, a cysteine-rich domain, a kringle domain, and an intracellular tyrosine kinase-like domain that lacks key catalytic residues and is therefore classified as a pseudokinase. Despite lacking canonical kinase activity, Ror proteins transduce signals by serving as scaffolds or co-receptors for Wnt ligands, particularly Wnt5a, and other signaling molecules. The binding event at the core of GO:0005115 is therefore a critical step in initiating non-canonical Wnt signaling, which regulates cell polarity, migration, and tissue morphogenesis during development. In cancer, ROR1 and ROR2 are frequently overexpressed and correlate with poor prognosis, making them attractive therapeutic targets. For example, a proteogenomic portrait of lung squamous cell carcinoma identified ROR1 as a potential therapeutic target, and subsequent studies have developed ROR1-targeting antibody-PROTAC conjugates and trispecific antibodies to exploit this binding function for tumor cell killing. Understanding the molecular details of GO:0005115 is thus essential for designing inhibitors, biologics, and cell-based models that can interrogate Ror signaling in health and disease. This article provides a research-grade overview of GO:0005115, covering its definition, biological significance, key genes, regulatory mechanisms, disease associations, and state-of-the-art methods for studying it, including CRISPR-based approaches offered by EDITGENE.
receptor tyrosine kinase-like orphan receptor binding At A Glance
| GO ID | GO:0005115 |
|---|---|
| GO term | receptor tyrosine kinase-like orphan receptor binding |
| Ontology | molecular_function |
| Synonym | receptor tyrosine kinase-like orphan receptor ligand, Ror binding, Ror ligand |
| Major function | Binding to Ror family receptors (ROR1, ROR2) to mediate non-canonical Wnt signaling and other cellular processes |
| Definition source | QuickGO |
| Related genes | ROR1, ROR2, WNT5A, WNT5B |
| Cellular context | Plasma membrane, cytonemes, signalosome |
| Disease relevance | Cancer, developmental disorders, tissue regeneration |
What Is GO:0005115?
GO:0005115 is defined as the binding to a receptor tyrosine kinase-like orphan receptor (Ror). In practice, this means the function of a protein or ligand that selectively interacts with ROR1, ROR2, or their orthologs. The term encompasses both the ligand activity (e.g., Wnt5a binding to ROR2) and the receptor's ability to engage downstream effectors. It is a molecular function term, not a biological process or cellular component, and it is used to annotate gene products that physically contact Ror proteins.
Why Is receptor tyrosine kinase-like orphan receptor binding Important in Cell Biology?
GO:0005115 is important because it defines the initial molecular recognition event that triggers Ror-mediated signaling, a pathway that is essential for embryonic development and is frequently hijacked in cancer. ROR1 and ROR2 are overexpressed in many malignancies, including lung squamous cell carcinoma, and their binding partners are being actively pursued as therapeutic targets. Moreover, the pseudokinase nature of Ror proteins makes them challenging but rewarding subjects for structural and functional studies, as understanding how ligands bind and activate them can reveal new avenues for drug discovery.
• ROR1 and ROR2 are overexpressed in multiple cancers and correlate with poor clinical outcomes.
• The binding function is required for Wnt5a-induced non-canonical signaling, which regulates cell migration and polarity.
• ROR1-targeting therapies, including antibody-drug conjugates and bispecific T-cell engagers, rely on specific binding to ROR1.
• Small-molecule inhibitors of ROR1 are being developed for cancer treatment, highlighting the druggability of this binding interface.
• Cytoneme-mediated transport of Wnt5b-Ror2 complexes demonstrates a role in long-range signaling during development.
• Pseudokinase domains of Ror proteins are structurally distinct and can serve as templates for designed binding proteins.
• Proteogenomic studies have identified ROR1 as a candidate target in lung squamous cell carcinoma.
• Understanding GO:0005115 aids in interpreting disease-associated mutations in ROR1 and ROR2.
• CRISPR knockout models of ROR1/2 can validate the functional consequences of disrupting this binding.
• The term is a key annotation for gene sets in pathway enrichment analyses of Wnt signaling.
Molecular Mechanism of receptor tyrosine kinase-like orphan receptor binding
Ligand Recognition and Binding Interface
In simple terms: This step is about how a ligand, such as Wnt5a, physically docks onto the Ror receptor.
The binding of ligands to Ror proteins is mediated primarily by the extracellular cysteine-rich domain (CRD) and kringle domain of ROR1 and ROR2. Wnt5a, a prototypical non-canonical Wnt ligand, binds to the CRD of ROR2 with high affinity, forming a complex that is subsequently internalized or transported along cytonemes. Structural studies of Ror pseudokinase domains have revealed that the binding interface is distinct from canonical tyrosine kinases, providing opportunities for selective targeting.
Conformational Changes and Receptor Activation
In simple terms: After binding, the receptor changes shape to transmit a signal inside the cell.
Ligand binding induces conformational changes in the intracellular region of Ror proteins, leading to the recruitment of adaptor proteins and activation of downstream pathways such as Rho GTPases and JNK. Although Ror proteins lack catalytic activity, they can form complexes with other kinases or scaffold proteins to propagate signals. The pseudokinase domain may act as a conformational switch that regulates these interactions.
Cytoneme-Mediated Transport of Active Complexes
In simple terms: Cells can send long, thin extensions to deliver signaling complexes to distant cells.
In zebrafish, active Wnt5b-Ror2 complexes are transported along cytonemes, actin-based filopodia, to reach target cells and activate signaling. This mechanism requires the binding of Wnt5b to Ror2 and the subsequent trafficking of the complex along the cytoneme. This finding highlights a specialized mode of Ror binding that extends beyond simple cell-surface interactions.
Regulation by Pseudokinase Domain and Cofactors
In simple terms: The receptor's own inactive kinase-like domain and other proteins can control how strongly it binds and signals.
The pseudokinase domain of ROR1 and ROR2 can bind ATP and other nucleotides, although it does not catalyze phosphorylation. This binding may modulate the receptor's conformation and its ability to interact with ligands or downstream effectors. Additionally, co-receptors such as ROR1 and ROR2 can heterodimerize, influencing ligand binding specificity and signaling output.
Key Genes Involved in GO:0005115 receptor tyrosine kinase-like orphan receptor binding
The following genes encode proteins that either bind to Ror receptors or are Ror receptors themselves, and they are central to the function annotated by GO:0005115.
| Gene | Major Role | Research Relevance |
|---|---|---|
| ROR1 | Receptor tyrosine kinase-like orphan receptor 1; binds Wnt5a and other ligands | Overexpressed in cancers; target for antibody-drug conjugates and PROTACs |
| ROR2 | Receptor tyrosine kinase-like orphan receptor 2; binds Wnt5a and Wnt5b | Critical for developmental morphogenesis; involved in cancer progression |
| WNT5A | Secreted ligand that binds ROR1/ROR2 to activate non-canonical Wnt signaling | Key regulator of cell migration and polarity; frequently dysregulated in cancer |
| WNT5B | Secreted ligand that binds ROR2 and is transported via cytonemes | Essential for zebrafish embryonic development; potential role in human disease |
| DVL1 | Dishevelled segment polarity protein 1; downstream effector of Ror signaling | Mediates non-canonical Wnt signaling; potential biomarker |
| DVL2 | Dishevelled segment polarity protein 2; interacts with Ror complexes | Involved in planar cell polarity; research model for signaling |
| DVL3 | Dishevelled segment polarity protein 3; downstream of Ror | Implicated in cancer and developmental disorders |
| RAC1 | Rho family GTPase; activated downstream of Ror binding | Regulates cytoskeletal dynamics; target for cancer invasion studies |
| RHOA | Rho family GTPase; mediates Ror-dependent cell polarity | Key effector of non-canonical Wnt signaling |
| JNK1 | Mitogen-activated protein kinase 8; downstream of Ror | Involved in stress responses and apoptosis |
| JNK2 | Mitogen-activated protein kinase 9; downstream of Ror | Modulates transcription in response to Ror activation |
| BRD4 | Bromodomain-containing protein 4; degraded by ROR1-targeting PROTAC | Therapeutic target in solid tumors |
| LAMP2 | Lysosomal-associated membrane protein 2; interacts with FLOT2 | Not directly linked to Ror binding but cited in related autophagy studies |
| FLOT2 | Flotillin 2; interacts with LAMP2 | Related to membrane microdomains; potential context for Ror signaling |
| CD3E | CD3 epsilon subunit of T-cell receptor; engaged by trispecific antibodies | Used in T-cell engagers targeting ROR1 |
| ROR1 (isoform) | Alternatively spliced isoform of ROR1 | May have distinct binding properties; relevant for isoform-specific targeting |
How Is receptor tyrosine kinase-like orphan receptor binding Regulated?
The binding function of Ror receptors is regulated at multiple levels. Expression of ROR1 and ROR2 is controlled by developmental transcription factors and is often reactivated in cancer. Post-translational modifications, such as glycosylation and phosphorylation, can modulate ligand binding affinity and downstream signaling. The pseudokinase domain can bind nucleotides, which may allosterically regulate the receptor's conformation. Additionally, the availability of Wnt ligands, such as Wnt5a and Wnt5b, is tightly controlled by secretion and transport mechanisms, including cytoneme-mediated delivery. Finally, co-receptor interactions and dimerization can influence binding specificity and signaling output.
receptor tyrosine kinase-like orphan receptor binding and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| ROR1 | Lung squamous cell carcinoma, leukemia, breast cancer | ROR1 knockout cancer cell lines; xenograft models |
| ROR2 | Robinow syndrome, osteosarcoma | Ror2 knockout mice; patient-derived iPSCs |
| WNT5A | Cancer progression, inflammation | Wnt5a overexpression or knockout cell models |
| BRD4 | Solid tumors (via ROR1-PROTAC) | BRD4 degradation assays in ROR1+ cells |
| CD3E | T-cell engager therapy for ROR1+ tumors | Trispecific antibody testing in co-culture assays |
Ror Binding in Cancer
ROR1 and ROR2 are overexpressed in numerous cancers, including lung squamous cell carcinoma, where proteogenomic analysis identified ROR1 as a potential therapeutic target. The binding of Wnt5a to ROR1 promotes tumor cell migration, invasion, and survival. Consequently, therapeutic strategies such as ROR1-targeting antibody-PROTAC conjugates and trispecific T-cell engagers have been developed to exploit this binding function for cancer treatment. Small-molecule inhibitors of ROR1 are also being explored.
Developmental Disorders and Cytoneme Defects
Ror2 mutations cause Robinow syndrome, a developmental disorder characterized by skeletal and craniofacial abnormalities. The binding of Wnt5b to Ror2 and its transport along cytonemes are essential for proper embryonic development in zebrafish. Disruption of this binding function can lead to defective tissue morphogenesis and patterning.
Ror Binding in Tissue Homeostasis and Regeneration
Beyond development, Ror-mediated Wnt signaling has been implicated in tissue regeneration and stem cell maintenance. The binding of Wnt5a to ROR2 regulates cell polarity and migration during wound healing. Dysregulation of this process can contribute to fibrosis and chronic inflammatory diseases.
From receptor tyrosine kinase-like orphan receptor binding-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does ROR1 binding to Wnt5a drive cancer cell migration? | ROR1 knockout in cancer cell lines (e.g., lung squamous carcinoma) |
| What is the structural basis of Wnt5b-Ror2 binding? | Point mutations in the CRD of Ror2 followed by binding assays |
| Can we visualize cytoneme-mediated transport of Ror2 complexes? | Knock-in of fluorescent tags (e.g., GFP) into the Ror2 locus in zebrafish |
| Does overexpression of ROR1 enhance tumor growth? | ROR1 overexpression in mouse xenografts |
| Can a ROR1-targeting PROTAC degrade BRD4? | Knock-in of degron tags or overexpression of BRD4 in ROR1+ cells |
| What is the role of the pseudokinase domain in ligand binding? | Point mutations in the pseudokinase domain of ROR1/ROR2 |
How to Study the receptor tyrosine kinase-like orphan receptor binding Process
| Method | What It Measures | Typical Application |
|---|---|---|
| Proteogenomics | Protein expression and genomic alterations | Identifying ROR1 as a cancer target |
| X-ray crystallography | 3D structure of protein-ligand complexes | Mapping the Ror pseudokinase domain binding site |
| Live-cell imaging | Real-time movement of fluorescently tagged complexes | Visualizing cytoneme-mediated Wnt5b-Ror2 transport |
| CRISPR knockout | Loss-of-function phenotypes | Validating ROR1 dependency in cancer cell lines |
| CRISPR knock-in | Tagged or mutated protein expression | Studying Ror2 localization and binding in vivo |
| Antibody-PROTAC | Targeted protein degradation | Degrading BRD4 via ROR1 binding |
| Trispecific T-cell engager | T-cell-mediated cytotoxicity | Targeting ROR1+ tumors |
| Small-molecule inhibitor screening | Binding affinity and selectivity | Developing ROR1 inhibitors |
Proteogenomic Profiling of Ror-Expressing Tumors
Proteogenomic analysis combines mass spectrometry-based proteomics with genomic data to identify overexpressed proteins and pathways. This approach was used to identify ROR1 as a target in lung squamous cell carcinoma. It can reveal correlations between ROR1 expression and clinical outcomes, and guide the development of targeted therapies.
Structural Biology of Pseudokinase Domains
X-ray crystallography and cryo-electron microscopy can resolve the three-dimensional structures of Ror pseudokinase domains and their complexes with ligands or nucleotides. These studies provide atomic-level insights into the binding interface and inform the design of inhibitors or engineered binding proteins.
Live-Cell Imaging of Cytoneme Transport
Fluorescence microscopy, including spinning-disk confocal and light-sheet imaging, allows real-time visualization of cytonemes and the transport of fluorescently tagged Wnt5b-Ror2 complexes in zebrafish embryos. This method is essential for understanding the dynamics of Ror binding in a physiological context.
CRISPR-Based Functional Genomics
CRISPR knockout and knock-in screens can systematically test the requirement of ROR1, ROR2, and their binding partners for cellular phenotypes such as proliferation, migration, and drug response. These screens can also identify synthetic lethal interactions and resistance mechanisms.
How CRISPR Can Be Used to Study GO:0005115 receptor tyrosine kinase-like orphan receptor binding
Knockout
CRISPR knockout of ROR1 or ROR2 in cancer cell lines can abolish ligand binding and downstream signaling, providing causal evidence for the role of GO:0005115 in tumor growth and migration. Knockout models are also useful for validating the specificity of ROR1-targeting therapies.
Point Mutation
Introducing point mutations into the ligand-binding domain of ROR1 or ROR2 (e.g., in the CRD) can disrupt binding without affecting protein expression, allowing precise dissection of the binding interface. Such models are valuable for testing the contribution of specific residues to Wnt5a binding.
Knock-in
Knock-in of fluorescent tags (e.g., GFP) or epitope tags into the endogenous ROR1 or ROR2 locus enables real-time tracking of the receptor and its binding partners in live cells and organisms. This approach preserves endogenous regulation and is ideal for studying cytoneme transport.
Overexpression
Overexpression of ROR1 or ROR2 in cell lines or mouse models can mimic the overexpression seen in cancers and enhance ligand binding, leading to increased activation of non-canonical Wnt signaling. Overexpression models are useful for testing the oncogenic potential of Ror proteins and for screening inhibitors.
How EDITGENE Supports receptor tyrosine kinase-like orphan receptor binding Research
Researchers studying receptor tyrosine kinase-like orphan receptor binding-related genes often need to determine whether a candidate gene is causally involved in a specific phenotype, such as cancer cell proliferation or developmental morphogenesis. EDITGENE provides a comprehensive suite of CRISPR-based services to generate precisely engineered cell and animal models, enabling rigorous functional validation of GO:0005115-related genes.
Contact EDITGENE today to design your custom CRISPR model for receptor tyrosine kinase-like orphan receptor binding research.
Frequently Asked Questions About receptor tyrosine kinase-like orphan receptor binding
What is GO:0005115?
GO:0005115 is a Gene Ontology molecular function term that describes the binding to a receptor tyrosine kinase-like orphan receptor (Ror), such as ROR1 or ROR2.
What genes are involved in receptor tyrosine kinase-like orphan receptor binding?
The main genes are ROR1 and ROR2, which encode the receptors, and their ligands such as WNT5A and WNT5B.
What diseases are associated with ROR1 and ROR2 binding?
ROR1 and ROR2 are overexpressed in cancers like lung squamous cell carcinoma and leukemia, and mutations in ROR2 cause Robinow syndrome.
How can I study receptor tyrosine kinase-like orphan receptor binding?
You can use CRISPR knockout, knock-in of tagged receptors, live-cell imaging, proteogenomics, and structural biology.
What is the role of ROR1 in cancer?
ROR1 promotes tumor cell migration, invasion, and survival, and is a target for antibody-drug conjugates and PROTACs.
What is the pseudokinase domain of Ror proteins?
It is an intracellular domain that resembles a tyrosine kinase but lacks catalytic activity; it can bind nucleotides and regulate receptor conformation.
How is Wnt5a involved in Ror binding?
Wnt5a is a ligand that binds to the cysteine-rich domain of ROR1 and ROR2, activating non-canonical Wnt signaling.
Can CRISPR be used to model Ror binding?
Yes, CRISPR knockout of ROR1/2 or knock-in of point mutations can precisely dissect the binding interface and its functional consequences.
What are cytonemes and how do they relate to Ror binding?
Cytonemes are long, thin cellular extensions that transport active Wnt5b-Ror2 complexes to distant cells, as shown in zebrafish.
What services does EDITGENE offer for Ror research?
EDITGENE provides CRISPR knockout, point mutation, knock-in, overexpression, library screening, and bioinformatics services for ROR1, ROR2, and related genes.
Conclusion
GO:0005115, receptor tyrosine kinase-like orphan receptor binding, is a fundamental molecular function that governs non-canonical Wnt signaling and has profound implications for development and cancer. The Ror family pseudokinases ROR1 and ROR2 are attractive therapeutic targets, and their binding interfaces are being actively characterized using structural biology, proteogenomics, and CRISPR-based models. Understanding the precise molecular details of these interactions will accelerate the development of targeted therapies and expand our knowledge of Ror biology.
References
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- 5. Wang L et al.. 2025. A novel ROR1-targeting antibody-PROTAC conjugate promotes BRD4 degradation for solid tumor treatment.. Theranostics 15(4):1238-1254 PMID: 39816690
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