GO:1990270 platelet-derived growth factor receptor-ligand complex: Components, Assembly and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:1990270 describes a tetrameric protein complex of two PDGF receptor subunits and two PDGF ligand subunits.
• PDGF ligand dimers bind and dimerize PDGF receptors at the plasma membrane, activating signaling.
• At least two receptor chains (A and B) and four ligand chains (A, B, C, D) form many receptor-ligand combinations.
• The complex is internalized after activation, linking surface binding to downstream trafficking.
• Dysregulated PDGF signaling contributes to cancers, fibrosis, and developmental disorders.
• CRISPR knockout, knock-in, and overexpression models enable causal dissection of PDGF complex components.
Description
The platelet-derived growth factor receptor-ligand complex (GO:1990270) is a cellular component defined as a tetrameric assembly of two PDGF receptor subunits and two PDGF ligand subunits. This complex forms when PDGF ligand dimers bind to PDGF receptors on the plasma membrane, inducing receptor dimerization and activation. PDGFs are involved in a wide variety of signaling processes and are found in all vertebrates. At least two different receptor chains (A and B) and four types of ligand chains (A, B, C, and D) are known, forming a wide variety of combinations of receptor-ligand complexes. Researchers study this complex to understand how extracellular growth factors transmit signals into cells and how dysregulation leads to disease. The complex is central to autocrine and paracrine signaling loops that control cell proliferation, migration, and survival.
platelet-derived growth factor receptor-ligand complex At A Glance
| GO ID | GO:1990270 |
|---|---|
| GO term | platelet-derived growth factor receptor-ligand complex |
| Ontology | cellular_component |
| Synonym | PDGF complex; PDGF receptor-ligand complex; receptor-ligand complex; PDGF-AA-receptor alpha complex; PDGF-BB-receptor beta complex |
| Major function | Mediates PDGF ligand binding, receptor dimerization, and activation of downstream signaling |
| Composition | Two PDGF receptor subunits and two PDGF ligand subunits |
| Ligand chains | PDGF-A, PDGF-B, PDGF-C, PDGF-D |
| Receptor chains | PDGFR-alpha, PDGFR-beta |
| Localization | Plasma membrane and internalized vesicles |
What Is GO:1990270?
GO:1990270 is a cellular component term describing a tetrameric protein complex consisting of two platelet-derived growth factor (PDGF) receptor subunits and two PDGF ligand subunits. Binding of the PDGF ligand dimer to the PDGF receptor in the plasma membrane induces receptor dimerization and activation. PDGFs are involved in a wide variety of signaling processes and are found in all vertebrates. At least two different receptor chains (A and B) and four types of ligand chains (A, B, C, and D) are known forming a wide variety of combinations of receptor-ligand complexes.
Why Is platelet-derived growth factor receptor-ligand complex Important in Cell Biology?
The platelet-derived growth factor receptor-ligand complex is a key node in cell-cell communication, controlling proliferation, migration, and survival in fibroblasts, smooth muscle cells, and other mesenchymal lineages. Because PDGF signaling is frequently deregulated in cancer, fibrosis, and vascular disease, understanding the assembly and regulation of this complex is essential for therapeutic targeting.
• Defines the molecular basis of PDGF-induced receptor activation.
• Explains how ligand dimers bridge and dimerize receptor chains.
• Links extracellular growth factor binding to intracellular signaling.
• Provides a framework for understanding autocrine transformation by v-sis.
• Relevant to cancers driven by PDGF/PDGFR overexpression.
• Implicated in fibrotic and vascular proliferative diseases.
• Guides development of PDGFR kinase inhibitors.
• Enables CRISPR-based dissection of receptor-ligand specificity.
• Supports biomarker discovery in preeclampsia and other disorders.
• Connects to calcium signaling and chondrocyte biology.
Structure and Composition of platelet-derived growth factor receptor-ligand complex
Ligand dimer binding
In simple terms: PDGF ligands pair up and bind to receptors on the cell surface.
PDGF ligand chains (A, B, C, D) form disulfide-linked dimers that bind to PDGF receptors. Binding of the PDGF ligand dimer to the PDGF receptor in the plasma membrane induces receptor dimerization and activation. Surface binding and internalization of PDGF have been demonstrated in human fibroblasts.
Receptor dimerization
In simple terms: Two receptor molecules come together when ligand binds.
Dimerization of extracellular domains of PDGF receptors is a key step in receptor-ligand interaction. The complex consists of two receptor subunits and two ligand subunits, forming a tetramer. Negative-stain electron microscopy of full-length human PDGFR-beta bound to PDGF-B revealed the architecture of the activated complex.
Receptor chain combinations
In simple terms: Different receptor and ligand types can mix and match.
At least two different receptor chains (A and B) and four types of ligand chains (A, B, C, and D) are known, forming a wide variety of combinations of receptor-ligand complexes. This combinatorial diversity underlies distinct signaling outcomes.
Internalization and trafficking
In simple terms: After signaling, the complex is taken into the cell.
Surface binding and internalization of platelet-derived growth factor occurs in human fibroblasts. Intracellular retention of membrane-anchored v-sis protein abrogates autocrine signal transduction, showing that trafficking of the ligand-receptor complex is critical for signaling.
Autocrine loop formation
In simple terms: Cells can stimulate themselves by making both ligand and receptor.
The v-sis oncoprotein loses transforming activity when targeted to the early Golgi complex, indicating that autocrine PDGF signaling requires proper trafficking of the ligand-receptor complex. Intracellular retention of v-sis abrogates autocrine signal transduction.
Key Genes Involved in GO:1990270 platelet-derived growth factor receptor-ligand complex
The following genes encode the receptor and ligand subunits that form the platelet-derived growth factor receptor-ligand complex, along with related signaling and trafficking factors.
| Gene | Major Role | Research Relevance |
|---|---|---|
| PDGFA | PDGF-A ligand chain | Forms PDGF-AA and PDGF-AB dimers that bind PDGFR-alpha |
| PDGFB | PDGF-B ligand chain | Forms PDGF-BB dimers; v-sis homolog involved in autocrine transformation |
| PDGFC | PDGF-C ligand chain | Forms PDGF-CC dimers that activate PDGFR-alpha and alpha-beta |
| PDGFD | PDGF-D ligand chain | Forms PDGF-DD dimers that activate PDGFR-beta |
| PDGFRA | PDGFR-alpha receptor subunit | Binds PDGF-AA, -AB, -BB, -CC; dimerizes upon ligand binding |
| PDGFRB | PDGFR-beta receptor subunit | Binds PDGF-BB and PDGF-DD; structure solved with PDGF-B |
| V-SIS | Viral oncogene homolog of PDGF-B | Trafficking-dependent transforming activity |
| SRC | Downstream kinase | Mediates PDGF-induced signaling |
| PLCG1 | Phospholipase C gamma | Calcium signaling downstream of PDGF |
| PIK3CA | PI3K catalytic subunit | Survival signaling from PDGFR |
| AKT1 | Serine/threonine kinase | Downstream effector of PDGF signaling |
| MAPK1 | ERK2 kinase | Proliferation signaling from PDGFR |
| STAT3 | Transcription factor | PDGF-induced gene expression |
| CAV1 | Caveolin-1 | Regulates PDGFR internalization |
| CLTC | Clathrin heavy chain | Endocytosis of ligand-receptor complex |
| RAB5A | Early endosome marker | Trafficking of internalized PDGF complex |
| GOLGA2 | Golgi apparatus protein | Relevant to v-sis retention studies |
How Is platelet-derived growth factor receptor-ligand complex Regulated?
The platelet-derived growth factor receptor-ligand complex is regulated at multiple levels. Ligand availability, receptor expression, and dimerization specificity control complex formation. Internalization and intracellular trafficking modulate signal duration; surface binding and internalization of PDGF have been quantified in human fibroblasts. Autocrine signaling requires proper trafficking, as retention of v-sis in the early Golgi abrogates transforming activity. Calcium signaling pathways are also activated downstream of PDGF in chondrocytes.
platelet-derived growth factor receptor-ligand complex and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| PDGFB | Oncogenesis, autocrine transformation | v-sis trafficking mutants in fibroblasts |
| PDGFRB | Vascular disease, fibrosis | PDGFRB knockout or point-mutation cell models |
| PDGFRA | Preeclampsia, extracellular matrix remodeling | Overexpression in trophoblast models |
| PDGFA | Chondrocyte signaling, bone disease | PDGFA knockout chondrocyte models |
| PDGFC | Fibrosis, cancer | Knock-in reporter models |
Cancer and oncogenesis
Deregulated PDGF signaling contributes to oncogenesis. The v-sis oncoprotein, a viral homolog of PDGF-B, loses transforming activity when targeted to the early Golgi complex, demonstrating that autocrine activation of the PDGF receptor-ligand complex is required for transformation. Intracellular retention of membrane-anchored v-sis protein abrogates autocrine signal transduction.
Fibrosis and vascular disease
PDGF is a potent mitogen for fibroblasts and smooth muscle cells, and its receptor-ligand complex is implicated in fibrotic and vascular proliferative disorders. Surface binding and internalization studies in human fibroblasts provide a basis for understanding PDGF-driven tissue remodeling.
Preeclampsia and extracellular matrix biology
Bioinformatic analysis has identified potential extracellular matrix related genes, including PDGF pathway components, in the pathogenesis of early onset preeclampsia. This suggests that the PDGF receptor-ligand complex may contribute to placental vascular pathology.
Chondrocyte and bone biology
Calcium signaling in endothelin- and platelet-derived growth factor-stimulated chondrocytes indicates a role for the PDGF receptor-ligand complex in skeletal biology.
From platelet-derived growth factor receptor-ligand complex-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does PDGF-B autocrine signaling require Golgi trafficking? | Point-mutation or tagged knock-in of PDGFB |
| What is the role of PDGFR-beta in vascular development? | PDGFRB knockout cell model |
| How does PDGF-AA binding affect receptor dimerization? | Overexpression of PDGFRA and PDGFA |
| What is the effect of PDGF-CC on receptor activation? | Knock-in of PDGFC with tagged receptor |
| How is the complex internalized? | Knockout of CLTC or CAV1 |
| Does PDGF signaling contribute to preeclampsia? | Overexpression or knockout in trophoblast cells |
How to Study the platelet-derived growth factor receptor-ligand complex Process
| Method | What It Measures | Typical Application |
|---|---|---|
| Radioligand binding | Surface binding and internalization | Quantify PDGF-receptor interaction |
| Negative-stain EM | Complex architecture | Visualize PDGFR-beta/PDGF-B complex |
| Calcium imaging | Downstream calcium flux | Chondrocyte signaling |
| Bioinformatic analysis | Gene expression signatures | Preeclampsia ECM genes |
| Transcriptomics | Cell-type specific expression | Telocyte characterization |
| Mutagenesis | Trafficking-dependent transformation | v-sis Golgi retention |
| Crosslinking | Receptor dimerization | Extracellular domain interactions |
Binding and internalization assays
Surface binding and internalization of platelet-derived growth factor can be measured using radiolabeled ligand in human fibroblasts. These assays quantify receptor occupancy and trafficking kinetics.
Structural analysis
Negative-stain electron microscopy of full-length human PDGFR-beta bound to PDGF-B has revealed the architecture of the receptor-ligand complex. Dimerization of extracellular domains can be studied by biochemical crosslinking.
Calcium signaling measurements
Calcium signaling in endothelin- and PDGF-stimulated chondrocytes can be monitored with fluorescent indicators to assess downstream activation.
Bioinformatic and transcriptomic analysis
Bioinformatic analysis of extracellular matrix related genes has identified PDGF pathway components in early onset preeclampsia. Transcriptomic characterization of telocytes in the dorsal root ganglion also provides context for PDGF signaling in specific cell types.
How CRISPR Can Be Used to Study GO:1990270 platelet-derived growth factor receptor-ligand complex
Knockout
CRISPR knockout of PDGFRA, PDGFRB, or ligand genes eliminates specific components of the platelet-derived growth factor receptor-ligand complex, enabling loss-of-function studies. Knockout of trafficking genes such as CLTC or CAV1 can reveal internalization requirements.
Point Mutation
Point mutations can be introduced into PDGFB to mimic v-sis trafficking mutants that lose transforming activity when retained in the early Golgi. Such models dissect the requirement for autocrine signaling.
Knock-in
Knock-in of tagged PDGFRB or PDGFB allows visualization and purification of the receptor-ligand complex. Tagged knock-in models can also track internalization and trafficking.
Overexpression
Overexpression of PDGF ligands and receptors recreates autocrine loops and enhances complex formation. Overexpression models are useful for studying ligand-induced dimerization and downstream signaling.
How EDITGENE Supports platelet-derived growth factor receptor-ligand complex Research
Researchers studying platelet-derived growth factor receptor-ligand complex-related genes often need to determine whether a candidate gene is causally involved in complex assembly, signaling, or disease. EDITGENE provides CRISPR-based cell models and screening services to enable these causal experiments.
Contact EDITGENE today to design your custom CRISPR model for platelet-derived growth factor receptor-ligand complex research.
Frequently Asked Questions About platelet-derived growth factor receptor-ligand complex
What is GO:1990270?
GO:1990270 is the platelet-derived growth factor receptor-ligand complex, a tetrameric protein complex of two PDGF receptor subunits and two PDGF ligand subunits.
What genes are involved in platelet-derived growth factor receptor-ligand complex?
Genes include PDGFA, PDGFB, PDGFC, PDGFD, PDGFRA, and PDGFRB, which encode ligand and receptor chains.
How does the PDGF receptor-ligand complex assemble?
PDGF ligand dimers bind to PDGF receptors on the plasma membrane, inducing receptor dimerization and activation.
What is the role of PDGF-B in the complex?
PDGF-B forms dimers that bind and activate PDGF receptors; the v-sis oncoprotein is a viral homolog of PDGF-B.
Is the PDGF receptor-ligand complex internalized?
Yes, surface binding and internalization of PDGF have been demonstrated in human fibroblasts.
What diseases are linked to PDGF receptor-ligand complex?
Deregulated PDGF signaling is linked to cancer, fibrosis, vascular disease, and preeclampsia.
How can I study PDGF receptor-ligand complex with CRISPR?
CRISPR knockout, point mutation, knock-in, and overexpression models allow functional dissection of complex components.
What is the structure of the PDGF receptor-ligand complex?
Negative-stain electron microscopy of full-length human PDGFR-beta bound to PDGF-B revealed its architecture.
Does PDGF signaling affect calcium levels?
Calcium signaling is activated in endothelin- and PDGF-stimulated chondrocytes.
What methods measure PDGF receptor-ligand complex activity?
Radioligand binding, negative-stain EM, calcium imaging, and bioinformatic analysis are commonly used.
Conclusion
The platelet-derived growth factor receptor-ligand complex (GO:1990270) is a central signaling assembly that translates extracellular PDGF signals into cellular responses. Its combinatorial diversity, trafficking-dependent regulation, and links to cancer, fibrosis, and preeclampsia make it a high-value target for CRISPR-based research. EDITGENE provides the tools to build precise knockout, point-mutation, knock-in, and overexpression models for this complex.
References
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- 2. Nilsson J et al.. 1983. Surface binding and internalization of platelet-derived growth factor in human fibroblasts.. Proc Natl Acad Sci U S A 80(18):5592-6 PMID: 6351063
- 3. Stojilkovic SS et al.. 1994. Calcium signaling in endothelin- and platelet-derived growth factor-stimulated chondrocytes.. J Bone Miner Res 9(5):705-14 PMID: 8053400
- 4. Zhan F et al.. 2024. Bioinformatic Analysis Identifies Potential Extracellular Matrix Related Genes in the Pathogenesis of Early Onset Preeclampsia.. Biochem Genet 62(2):646-665 PMID: 37498421
- 5. Chen PH et al.. 2015. Structure of Full-Length Human PDGFRβ Bound to Its Activating Ligand PDGF-B as Determined by Negative-Stain Electron Microscopy.. J Mol Biol 427(24):3921-34 PMID: 26463591
- 6. Haberberger RV et al.. 2025. Transcriptomic and Histological Characterization of Telocytes in the Human Dorsal Root Ganglion.. J Comp Neurol 533(3):e70044 PMID: 40097369
- 7. Hart KC et al.. 1994. The v-sis oncoprotein loses transforming activity when targeted to the early Golgi complex.. J Cell Biol 127(6 Pt 2):1843-57 PMID: 7806564
- 8. Lee BA et al.. 1992. Intracellular retention of membrane-anchored v-sis protein abrogates autocrine signal transduction.. J Cell Biol 118(5):1057-70 PMID: 1324943
