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A bacterially expressed single-chain Fv construct from the 2B4 T-cell receptor
I Kurucz1, C R Jost, A J George
1Experimental Immunology Branch, National Cancer Institute, National Institutes of Health, Bethesda, MD 20892.
Summary
Researchers created a recombinant single-chain variable fragment (scFv) of the 2B4 T-cell receptor. This scFv protein can be produced in large quantities and used for studying T-cell function.
Area of Science:
- Immunology
- Molecular Biology
- Biochemistry
Background:
- The 2B4 T-cell receptor (TCR) plays a crucial role in immune responses.
- Understanding TCR structure and function is vital for immunology research.
- Recombinant TCRs offer potential tools for modulating T-cell activity.
Purpose of the Study:
- To develop a method for producing a functional single-chain variable fragment (scFv) of the 2B4 TCR.
- To characterize the refolded scFv protein for its structural integrity and binding properties.
- To assess the utility of recombinant 2B4 scFv for T-cell studies.
Main Methods:
- Expression of a single-chain Fv construct of the 2B4 TCR in Escherichia coli.
- Solubilization of bacterial inclusion bodies using guanidine hydrochloride.
- Refolding of the protein via denaturation and disulfide bond formation.
- Characterization of refolded protein using nondenaturing solvents and antibody binding assays.
Main Results:
- Successfully produced 65-100 mg of refolded 2B4 scFv protein per liter of bacterial culture.
- A significant fraction of the refolded protein was monomeric and structurally sound.
- The recombinant 2B4 scFv bound specifically to monoclonal antibodies recognizing native 2B4 determinants.
Conclusions:
- T-cell receptor variable regions can form stable and functional single-chain Fv molecules.
- This study provides a scalable method for producing recombinant 2B4 scFv.
- The generated recombinant 2B4 scFv is a valuable tool for investigating T-cell function and immune signaling.