GO:0002116 semaphorin receptor complex: Components, Assembly and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0002116 (semaphorin receptor complex) is a cellular_component defined as a stable binary complex of a semaphorin and a plexin that together form a functional semaphorin receptor.
• The complex is best understood as a ligand-receptor unit in which secreted or membrane-bound semaphorins bind plexin family proteins to trigger intracellular signaling.
• Plexin D1 (PLXND1) is a mechanosensitive component of this receptor system in endothelial cells, linking semaphorin signaling to blood vessel guidance and mechanotransduction.
• Endothelial PlexinD1 signaling instructs spinal cord vascularization and motor neuron development, showing that the complex controls both neural and vascular patterning.
• Semaphorin 3C (SEMA3C) can reshape the stromal microenvironment and promote hepatocellular carcinoma progression, implicating the complex in cancer biology.
• Single-cell and spatial profiling studies have linked semaphorin-plexin communication to diabetic kidney disease and neurodegenerative disease microenvironments [3,4].
Description
The semaphorin receptor complex (GO:0002116) is a cellular component defined as a stable binary complex of a semaphorin and a plexin, together forming a functional semaphorin receptor. Semaphorins are a large family of secreted and membrane-associated guidance cues, and plexins are their canonical receptors; when the two associate, they create a signaling-competent receptor unit that converts extracellular cues into intracellular responses. Because the complex is a binary assembly rather than a single polypeptide, it is best studied as a dynamic protein-protein interface that can be reconfigured by alternative semaphorin-plexin pairings. This GO term matters because semaphorin-plexin signaling is not restricted to axon guidance. Plexin D1 acts as a mechanosensor in endothelial cells, meaning the complex can translate mechanical forces into biochemical signals that shape vessel architecture. Endothelial PlexinD1 signaling also instructs spinal cord vascularization and motor neuron development, demonstrating that the complex coordinates neurovascular patterning during development. In disease, semaphorin-plexin communication has been implicated in tumor microenvironment remodeling, kidney pathology, and neurodegeneration, making GO:0002116 a relevant node for both basic and translational research [2,3,4]. For researchers, GO:0002116 provides a precise annotation target for proteomic, imaging, and functional studies of semaphorin-plexin assemblies. Because the complex is defined by a stable binary interaction, it can be interrogated with co-immunoprecipitation, proximity labeling, and structural approaches, while CRISPR-based models allow causal testing of each partner [5,7].
semaphorin receptor complex At A Glance
| GO ID | GO:0002116 |
|---|---|
| GO term | semaphorin receptor complex |
| Ontology | cellular_component |
| Synonym | plexin-neurophilin complex |
| Definition | A stable binary complex of a semaphorin and a plexin, together forming a functional semaphorin receptor. |
| Major function | Ligand-receptor signaling unit for semaphorin-mediated guidance and mechanotransduction [5,8] |
| Key partners | Semaphorin ligands and plexin receptors, including PLXND1 [5,7] |
| Biological context | Axon guidance, vascular patterning, neurovascular development, tumor microenvironment [2,7] |
| Disease relevance | Cancer progression, diabetic kidney disease, neurodegenerative disease [2,3,4] |
What Is GO:0002116?
GO:0002116, semaphorin receptor complex, is a cellular component ontology term describing a stable binary complex formed by a semaphorin and a plexin. The two proteins associate to create a functional semaphorin receptor, meaning the complex is the minimal signaling unit rather than a multi-subunit receptor with separate ligand-binding and catalytic chains. The synonym plexin-neurophilin complex reflects the historical observation that plexins and neuropilins cooperate in semaphorin reception, although the core GO definition emphasizes the semaphorin-plexin binary pair.
Why Is semaphorin receptor complex Important in Cell Biology?
GO:0002116 is important because it defines the minimal molecular machine through which semaphorins exert their effects. Semaphorin-plexin signaling controls axon guidance, vascular patterning, and mechanotransduction, and the receptor complex is the point at which these diverse inputs converge [5,7,8]. Because the complex is a binary assembly, its composition and stability directly determine signaling output, making it a tractable target for structural, proteomic, and genetic studies. In disease, semaphorin-plexin communication has been linked to tumor progression, kidney pathology, and neurodegeneration, so understanding the complex can inform biomarker and therapeutic strategies [2,3,4].
• Defines the minimal signaling unit for semaphorin-plexin communication.
• Controls axon guidance and neural circuit wiring during development.
• Acts as a mechanosensor in endothelial cells through Plexin D1.
• Instructs spinal cord vascularization and motor neuron development.
• Contributes to tumor microenvironment remodeling in hepatocellular carcinoma.
• Is implicated in diabetic kidney disease microenvironments by single-cell profiling.
• Is part of brain cell communication networks relevant to neurodegenerative disease.
• Provides a defined annotation target for proteomic and imaging studies of receptor complexes [5,8].
• Enables CRISPR-based causal testing of semaphorin and plexin partners [5,7].
• Links extracellular guidance cues to intracellular signaling in multiple tissues.
Structure and Composition of semaphorin receptor complex
Binary semaphorin-plexin assembly
In simple terms: A semaphorin protein and a plexin protein join together to form one functional receptor.
The core of GO:0002116 is a stable binary complex between a semaphorin and a plexin. This assembly is the functional receptor: the semaphorin provides the ligand moiety, while the plexin provides the signaling moiety that relays information into the cell. Because the complex is defined as a binary pair, its identity depends on which semaphorin and which plexin are expressed in a given cell type.
Plexin D1 as a mechanosensitive component
In simple terms: One plexin family member, Plexin D1, can sense physical forces in blood vessel cells.
Plexin D1 (PLXND1) is a guidance receptor that functions as a mechanosensor in endothelial cells. This means the semaphorin receptor complex can convert mechanical cues into biochemical signals, expanding its role beyond classical ligand binding. The mechanosensitive property of PLXND1 places the complex at the interface of hemodynamics and vascular signaling.
Neuropilin-associated receptor context
In simple terms: The synonym plexin-neurophilin complex reminds us that neuropilins often assist semaphorin reception.
The synonym plexin-neurophilin complex reflects the historical and functional association between plexins and neuropilins in semaphorin signaling. While the GO definition centers on the semaphorin-plexin binary pair, neuropilins can modulate ligand presentation and receptor activation in certain contexts. Researchers should therefore consider the broader receptor context when interpreting GO:0002116 annotations.
Membrane and secreted semaphorin variants
In simple terms: Semaphorins come in membrane-bound and secreted forms, but both can engage plexins.
Semaphorins include secreted and membrane-associated family members, and the receptor complex can form with either class. This diversity means the same GO term can annotate complexes with distinct biophysical properties, depending on the semaphorin involved. The stable binary nature of the complex is the unifying feature that defines GO:0002116.
Assembly in neurovascular development
In simple terms: The complex assembles where nerves and blood vessels pattern together.
Endothelial PlexinD1 signaling instructs spinal cord vascularization and motor neuron development, showing that the complex assembles in neurovascular niches. In these settings, the semaphorin receptor complex coordinates guidance decisions across cell types. This developmental context is a key reference for functional studies of GO:0002116.
Key Genes Involved in GO:0002116 semaphorin receptor complex
The following genes and proteins are the principal components and context-dependent partners of the semaphorin receptor complex (GO:0002116).
| Gene | Major Role | Research Relevance |
|---|---|---|
| PLXND1 | Plexin D1 receptor; mechanosensor in endothelial cells | Mechanotransduction and vascular signaling studies |
| SEMA3C | Semaphorin 3C ligand; stromal microenvironment remodeling | Hepatocellular carcinoma progression models |
| PLXNA1 | Plexin A1 receptor for class 3 semaphorins | Axon guidance and receptor complex assembly |
| PLXNA2 | Plexin A2 receptor for class 3 semaphorins | Neuronal guidance and signaling studies |
| PLXNA3 | Plexin A3 receptor for class 3 semaphorins | Receptor complex composition studies |
| PLXNA4 | Plexin A4 receptor for class 3 semaphorins | Axon guidance and cancer context |
| PLXNB1 | Plexin B1 receptor for class 4 semaphorins | Receptor complex and tumor biology |
| PLXNB2 | Plexin B2 receptor for class 4 semaphorins | Receptor complex and tissue patterning |
| PLXNC1 | Plexin C1 receptor for viral semaphorins | Immune and viral semaphorin studies |
| SEMA3A | Secreted semaphorin ligand | Axon guidance and receptor activation |
| SEMA3E | Secreted semaphorin ligand | Plexin D1-dependent signaling |
| SEMA4D | Membrane semaphorin ligand | Plexin B1 signaling studies |
| NRP1 | Neuropilin co-receptor | Semaphorin presentation and receptor context |
| NRP2 | Neuropilin co-receptor | Semaphorin presentation and receptor context |
| SEMA3C | Semaphorin ligand in tumor stroma | Cancer microenvironment remodeling |
| PLXND1 | Endothelial guidance receptor | Spinal cord vascularization and motor neuron development |
| SEMA3C | Semaphorin ligand in kidney microenvironment | Diabetic kidney disease profiling |
How Is semaphorin receptor complex Regulated?
Semaphorin receptor complex function is regulated at multiple levels. Receptor availability and signaling output depend on which semaphorin and plexin family members are expressed in a given cell, and the complex can be modulated by co-receptors such as neuropilins. In endothelial cells, Plexin D1 acts as a mechanosensor, meaning mechanical forces can regulate the complex's signaling activity. Developmental cues also control complex assembly, as endothelial PlexinD1 signaling instructs spinal cord vascularization and motor neuron development. In disease contexts, semaphorin-plexin communication is remodeled in the tumor microenvironment and in kidney and brain pathology, indicating that extracellular and tissue-level signals influence complex function [2,3,4].
semaphorin receptor complex and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| SEMA3C | Hepatocellular carcinoma progression and stromal remodeling | Knockout or overexpression in liver cancer cell lines and xenografts |
| PLXND1 | Endothelial mechanotransduction and vascular signaling | Endothelial-specific knockout or point mutation models |
| PLXND1 | Spinal cord vascularization and motor neuron development | Developmental knockout and knock-in models |
| SEMA3C | Diabetic kidney disease microenvironment | Single-cell profiling and kidney organoid models |
| PLXNA4 | Neurodegenerative disease cell communication | Brain organoid and CRISPR knockout models |
Semaphorin receptor complex in cancer
Semaphorin 3C (SEMA3C) reshapes the stromal microenvironment to promote hepatocellular carcinoma progression, linking the semaphorin receptor complex to tumor biology. This suggests that semaphorin-plexin signaling can be co-opted by tumors to remodel surrounding tissue and support growth. Researchers can use GO:0002116 to annotate and interpret semaphorin-plexin interactions in cancer datasets.
Semaphorin receptor complex in kidney disease
Single-cell transcriptomic profiles in early diabetic kidney disease have revealed changes in the microenvironment that include semaphorin-plexin communication. These findings position the semaphorin receptor complex as a potential node in kidney pathology. The complex may therefore be relevant to understanding how cell-cell communication is altered in diabetic kidney disease.
Semaphorin receptor complex in neurodegenerative disease
Comprehensive analyses of brain cell communications based on multiple scRNA-seq and snRNA-seq datasets have implicated semaphorin-plexin signaling in neurodegenerative disease mechanisms. This work highlights the complex as part of the intercellular communication network in the brain. GO:0002116 provides a useful annotation for interpreting these brain cell interaction datasets.
Semaphorin receptor complex in neurovascular development
Endothelial PlexinD1 signaling instructs spinal cord vascularization and motor neuron development, demonstrating that the complex is essential for normal neurovascular patterning. Disruption of this signaling can affect both vascular and neural development. This developmental role provides a framework for understanding how the complex contributes to disease when dysregulated.
From semaphorin receptor complex-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does loss of PLXND1 abolish mechanosensing in endothelial cells? | PLXND1 knockout endothelial cells |
| Does a specific plexin point mutation disrupt semaphorin binding? | Point-mutation knock-in of PLXND1 or PLXNA family genes |
| Can a tagged semaphorin receptor complex be visualized in live cells? | Tagged knock-in of semaphorin or plexin alleles |
| Does SEMA3C overexpression remodel the tumor stroma? | SEMA3C overexpression in cancer cell lines and xenografts |
| Is the semaphorin receptor complex required for spinal cord vascularization? | Endothelial-specific knockout in developmental models |
| Which cell types express semaphorin-plexin pairs in kidney disease? | Single-cell RNA-seq with CRISPR-validated targets |
How to Study the semaphorin receptor complex Process
| Method | What It Measures | Typical Application |
|---|---|---|
| Co-immunoprecipitation | Physical association of semaphorin and plexin | Validation of binary complex formation |
| Proximity labeling | Proteins near a bait semaphorin or plexin | Mapping complex components in cells |
| Single-cell RNA-seq | Cell-type expression of semaphorin and plexin genes | Kidney and brain communication mapping [3,4] |
| Spatial transcriptomics | Localization of complex components in tissue | Tumor and developmental tissue studies [2,7] |
| Mechanotransduction assay | Signaling response to mechanical force | Endothelial Plexin D1 studies |
| Fluorescent imaging | Subcellular localization of tagged complex components | Neurovascular development studies |
| CRISPR knockout | Loss-of-function effect on complex function | Causal testing of semaphorin and plexin genes [5,7] |
| Overexpression | Gain-of-function effect on signaling | Tumor microenvironment remodeling studies |
Co-immunoprecipitation and proximity labeling
Because GO:0002116 is defined as a stable binary complex, co-immunoprecipitation and proximity labeling are direct ways to detect semaphorin-plexin association. These methods can confirm which semaphorin and plexin partners form a complex in a given cell type. They are also useful for validating CRISPR-engineered tagged alleles.
Single-cell and spatial transcriptomics
Single-cell transcriptomic profiling has been used to map semaphorin-plexin communication in diabetic kidney disease and in brain cell interaction networks [3,4]. These approaches reveal which cell types express the complex components and how communication changes in disease [3,4]. They are powerful for generating hypotheses that can then be tested with CRISPR models [3,4].
Mechanotransduction assays
Plexin D1 functions as a mechanosensor in endothelial cells, so assays that apply controlled mechanical forces are essential for studying this aspect of the complex. Such assays can measure signaling output downstream of the semaphorin receptor complex under flow or stretch. Combining mechanotransduction assays with CRISPR knockout of PLXND1 provides causal evidence.
Developmental and neurovascular imaging
Endothelial PlexinD1 signaling instructs spinal cord vascularization and motor neuron development, making imaging of developing neurovascular tissues a key method. Fluorescent reporters and tagged knock-in alleles can visualize complex components in situ. These methods connect molecular assembly to tissue-level patterning.
How CRISPR Can Be Used to Study GO:0002116 semaphorin receptor complex
Knockout
CRISPR knockout of semaphorin or plexin genes is a direct way to test the function of GO:0002116. For example, knocking out PLXND1 can reveal whether endothelial mechanosensing depends on the semaphorin receptor complex. Knockout of plexin genes in developmental models can also test requirements for spinal cord vascularization and motor neuron development.
Point Mutation
Point mutations can be introduced into semaphorin or plexin genes to dissect which residues are required for complex formation or signaling. This is particularly useful for separating ligand-binding interfaces from signaling-competent surfaces. Point-mutation models can also test whether specific residues are needed for mechanosensitive responses in PLXND1.
Knock-in
Knock-in of tagged alleles allows endogenous semaphorin or plexin proteins to be tracked without overexpression artifacts. Tagged knock-in models can be used to visualize the semaphorin receptor complex in live cells and tissues. They are also valuable for developmental studies of neurovascular patterning.
Overexpression
Overexpression of semaphorin ligands such as SEMA3C can model gain-of-function states relevant to cancer and stromal remodeling. Overexpression models can reveal how excess ligand reshapes the microenvironment and activates plexin signaling. They complement knockout approaches by testing sufficiency rather than necessity.
How EDITGENE Supports semaphorin receptor complex Research
Researchers studying semaphorin receptor complex-related genes often need to determine whether a candidate gene is causally involved in complex assembly, signaling, or disease progression. EDITGENE provides CRISPR-based cell models and screening services that allow precise, reproducible testing of semaphorin and plexin gene function in relevant cell types.
Contact EDITGENE today to design your custom CRISPR model for semaphorin receptor complex research.
Frequently Asked Questions About semaphorin receptor complex
What is GO:0002116 semaphorin receptor complex?
GO:0002116 is a cellular component term describing a stable binary complex of a semaphorin and a plexin that together form a functional semaphorin receptor.
What genes are involved in the semaphorin receptor complex?
Key genes include plexin family members such as PLXND1 and semaphorin ligands such as SEMA3C, with neuropilins often acting as co-receptors [5,8].
What is the function of the semaphorin receptor complex?
It converts semaphorin guidance cues into intracellular signals and can act as a mechanosensor in endothelial cells [5,8].
How is the semaphorin receptor complex related to cancer?
SEMA3C can reshape the stromal microenvironment to promote hepatocellular carcinoma progression, linking the complex to tumor biology.
Is the semaphorin receptor complex involved in kidney disease?
Single-cell transcriptomic studies of early diabetic kidney disease have revealed changes in semaphorin-plexin communication in the microenvironment.
What is the role of PLXND1 in the semaphorin receptor complex?
PLXND1 is a plexin D1 receptor that functions as a mechanosensor in endothelial cells and instructs spinal cord vascularization and motor neuron development [5,7].
How can I study the semaphorin receptor complex in the lab?
Common approaches include co-immunoprecipitation, proximity labeling, single-cell transcriptomics, mechanotransduction assays, and CRISPR knockout or knock-in models [5,7,8].
What is the synonym for GO:0002116?
The synonym is plexin-neurophilin complex.
Which diseases are linked to semaphorin-plexin signaling?
Semaphorin-plexin signaling has been linked to cancer progression, diabetic kidney disease, and neurodegenerative disease [2,3,4].
Can CRISPR be used to study the semaphorin receptor complex?
Yes, CRISPR knockout, point mutation, knock-in, and overexpression models can test the causal roles of semaphorin and plexin genes [5,7].
Conclusion
GO:0002116, the semaphorin receptor complex, defines the minimal binary unit through which semaphorins and plexins communicate. It is central to axon guidance, vascular patterning, mechanotransduction, and disease processes including cancer, kidney disease, and neurodegeneration [2,3,4,5,7,8]. Because the complex is a stable protein-protein assembly, it is well suited to CRISPR-based causal studies and to proteomic and imaging approaches [5,7,8]. Researchers can use this annotation to interpret cell-cell communication datasets and to design targeted experiments on semaphorin-plexin biology [3,4].
References
- 2. Peng H et al.. 2024. Semaphorin 3C (Sema3C) reshapes stromal microenvironment to promote hepatocellular carcinoma progression.. Signal Transduct Target Ther 9(1):169 PMID: 38956074
- 3. Tsai YC et al.. 2023. Single-cell transcriptomic profiles in the pathophysiology within the microenvironment of early diabetic kidney disease.. Cell Death Dis 14(7):442 PMID: 37460555
- 4. Zhang C et al.. 2023. Comprehensive analyses of brain cell communications based on multiple scRNA-seq and snRNA-seq datasets for revealing novel mechanism in neurodegenerative diseases.. CNS Neurosci Ther 29(10):2775-2786 PMID: 37269061
- 5. Mehta V et al.. 2020. The guidance receptor plexin D1 is a mechanosensor in endothelial cells.. Nature 578(7794):290-295 PMID: 32025034
- 7. Vieira JR et al.. 2022. Endothelial PlexinD1 signaling instructs spinal cord vascularization and motor neuron development.. Neuron 110(24):4074-4089.e6 PMID: 36549270
- 8. Castellani V et al.. 2002. Control of semaphorin signaling.. Curr Opin Neurobiol 12(5):532-41 PMID: 12367632
