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Published on: December 28, 2015
Expression and purification of functional PDGF receptor beta
Qingbin Shang1, Liang Zhao2, Xiaojing Wang2
1School of Life Sciences, Tianjin University, Tianjin 300072, PR China.
Abstract:
Platelet Derived Growth Factor receptors (PDGFRs), members of receptor tyrosine kinase superfamily, play essential roles in early hematopoiesis, angiogenesis and organ development. Dysregulation of PDGF receptor signaling under pathological conditions associates with cancers, vascular diseases, and fibrotic diseases. Therefore, they are attractive targets in drug development. Like any other membrane proteins with a single-pass transmembrane domain, the high-resolution structural information of the full-length PDGF receptors is still not resolved. It is caused, at least in part, by the technical challenges in the expression and purification of the functional, full-length PDGF receptors. Herein, we reported our experimental details in expression and purification of the full-length PDGFRβ from mammalian cells. We found that purified PDGFRβ remained in two different oligomeric states, presumably the monomer and the dimer, with basal kinase activity in detergent micelles. Addition of PDGF-B promoted dimerization and elevated kinase activity of the receptor, suggesting that purified receptors were functional.
Insights
Researchers purified full-length Platelet Derived Growth Factor receptor beta (PDGFRβ) from mammalian cells. The functional receptor dimerized and showed increased kinase activity upon PDGF-B addition, aiding drug development for diseases like cancer.
Area of Science:
- Biochemistry
- Molecular Biology
- Cell Signaling
Background:
- Platelet-Derived Growth Factor Receptors (PDGFRs) are crucial receptor tyrosine kinases involved in vital biological processes.
- Aberrant PDGFR signaling is implicated in various pathologies, including cancers, vascular, and fibrotic diseases, making them significant drug targets.
- Obtaining high-resolution structural data for full-length PDGFRs is challenging due to difficulties in expression and purification.
Purpose of the Study:
- To detail the experimental methods for expressing and purifying full-length PDGFRβ from mammalian cells.
- To assess the functional state and oligomeric properties of the purified PDGFRβ.
- To investigate the receptor's response to its ligand, PDGF-B.
Main Methods:
- Expression of full-length PDGFRβ in mammalian cell systems.
- Purification of the functional receptor using established biochemical techniques.
- Analysis of receptor oligomeric states (monomer/dimer) and kinase activity in detergent micelles.
- Stimulation with PDGF-B to observe dimerization and kinase activity changes.
Main Results:
- Successfully purified full-length PDGFRβ was obtained from mammalian cells.
- The purified receptor existed in monomeric and dimeric forms, exhibiting basal kinase activity.
- Addition of PDGF-B induced receptor dimerization and significantly enhanced its kinase activity, confirming functionality.
Conclusions:
- The developed methods enable the purification of functional, full-length PDGFRβ.
- The purified receptor demonstrates ligand-dependent dimerization and activation, crucial for its biological roles.
- This work provides a foundation for further structural and functional studies of PDGFRβ, aiding therapeutic strategies.
