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Updated: Jul 3, 2026
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Characterization of Glycoproteins with the Immunoglobulin Fold by X-Ray Crystallography and Biophysical Techniques
Published on: July 5, 2018
Crystallization and preliminary X-ray diffraction analysis of the ternary human GM-CSF receptor complex
Guido Hansen1, Timothy R Hercus, Yibin Xu
1Biota Structural Biology Laboratory, St Vincent's Institute of Medical Research, 41 Victoria Parade, Fitzroy, Victoria 3065, Australia.
Summary
Researchers crystallized the granulocyte-macrophage colony-stimulating factor (GM-CSF) receptor complex. This structural insight aids understanding of hematopoietic growth factor signaling pathways.
Area of Science:
- Biochemistry
- Molecular Biology
- Structural Biology
Background:
- Granulocyte-macrophage colony-stimulating factor (GM-CSF) is a key hematopoietic growth factor.
- GM-CSF signaling involves a ternary receptor complex with specific alpha (GMRalpha) and common beta (betac) subunits.
- The genes encoding these components are csf2, csf2ra, and csf2rb.
Purpose of the Study:
- To obtain high-resolution crystals of the ternary GM-CSF receptor ectodomain complex.
- To facilitate structural analysis of GM-CSF receptor interactions.
- To investigate the role of specific mutations in crystal formation.
Main Methods:
- Crystallization using the hanging-drop vapor-diffusion method.
- Utilized polyethylene glycol 3350 and proline for crystal growth.
- Employed a glutamine-substitution mutant (N346Q) of the betac subunit.
Main Results:
- Successfully obtained crystals of the ternary complex.
- The N346Q mutation in betac yielded the best diffracting crystals.
- Crystals belonged to space group P6(3)22 and diffracted to 3.3 Å resolution.
Conclusions:
- The study provides a crystal structure of the GM-CSF ternary receptor complex.
- This structural information is crucial for understanding GM-CSF signaling mechanisms.
- The findings pave the way for further investigations into receptor-ligand interactions.
