Related Experiment Videos
A T cell receptor V alpha domain expressed in bacteria: does it dimerize in solution?
D Plaksin1, S Chacko, P McPhie
1Molecular Biology Section, National Institute of Allergy and Infections Diseases, National Institutes of Health, Bethesda, Maryland 20892, USA.
The Journal of Experimental Medicine
|October 1, 1996
Summary
This study explored T cell receptor (TCR) V alpha domain dimerization potential. Results show some V alpha domains have limited homodimerization tendencies, impacting TCR-mediated T cell activation models.
Area of Science:
- Immunology
- Structural Biology
- Biochemistry
Background:
- T cell receptors (TCRs) are crucial for adaptive immunity.
- TCR dimerization is proposed in T cell activation models.
- Understanding TCR V alpha domain behavior is key.
Purpose of the Study:
- To clone and express a specific TCR V alpha domain.
- To investigate the dimerization potential of this domain.
- To assess implications for T cell activation.
Main Methods:
- cDNA cloning and bacterial expression of TCR V alpha domain.
- Protein purification, refolding, and characterization (SEC, SDS-PAGE).
- Crystallization, circular dichroism, and NMR spectroscopy.
Main Results:
- High yield and solubility of refolded V alpha protein.
- Monomeric state confirmed by chromatography and electrophoresis.
- NMR indicated equal populations of dimeric and monomeric forms at 1 mM.
Conclusions:
- The studied V alpha domain exhibits limited homodimerization.
- TCR dimerization models need to account for V alpha domain behavior.
- This finding refines understanding of TCR-mediated signaling.