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Updated: Jul 15, 2026
A Method For Production of Recombinant mCD1d Protein in Insect Cells.
Published on: December 10, 2007
Ligand-independent assembly of recombinant human CD1 by using oxidative refolding chromatography
M M Altamirano1, A Woolfson, A Donda
1Centre for Protein Engineering, Hills Road, Cambridge CB2 2QH, United Kingdom.
Insights
Researchers developed a novel folding method for assembling CD1a and CD1b molecules. This technique efficiently produces ligand-free and ligand-associated forms, suggesting empty MHC class I-like molecules can be stable without ligands.
Area of Science:
- Immunology
- Protein Biochemistry
Background:
- CD1 molecules are MHC class I-like antigen-presenting proteins crucial for immune responses.
- In vitro refolding of MHC class I molecules typically necessitates ligand presence for proper assembly.
- The stability and assembly of ligand-free MHC class I-like molecules remain incompletely understood.
Purpose of the Study:
- To develop a fast and efficient method for assembling ligand-free and ligand-associated CD1a and CD1b molecules.
- To investigate the stability of empty MHC class I-like molecules at physiological temperatures.
- To extend the utility of oxidative refolding chromatography to complex protein assemblies.
Main Methods:
- Utilized a novel folding method involving immobilized chaperone fragments, protein disulfide isomerase, and peptidyl-prolyl cis-trans isomerase (oxidative refolding chromatography).
- Synthesized CD1a and CD1b heavy chains and beta(2)-microglobulin light chains in Escherichia coli.
- Applied oxidative refolding chromatography for the assembly of CD1a and CD1b.
Main Results:
- Achieved fast and efficient assembly of both ligand-free and ligand-associated CD1a and CD1b.
- Demonstrated that "empty" MHC class I-like molecules can assemble and remain stable at physiological temperatures without a ligand.
- Successfully extended oxidative refolding chromatography to complex multisubunit proteins.
Conclusions:
- The developed oxidative refolding chromatography method enables efficient assembly of CD1 molecules, including ligand-free forms.
- Empty MHC class I-like molecules exhibit stability at physiological temperatures, challenging previous assumptions.
- This technique broadens the scope for studying immunoglobulin superfamily proteins, especially those with unidentified ligands.
Abstract:
CD1 is an MHC class I-like antigen-presenting molecule consisting of a heavy chain and beta(2)-microglobulin light chain. The in vitro refolding of synthetic MHC class I molecules has always required the presence of ligand. We report here the use of a folding method using an immobilized chaperone fragment, a protein disulphide isomerase, and a peptidyl-prolyl cis-trans isomerase (oxidative refolding chromatography) for the fast and efficient assembly of ligand-free and ligand-associated CD1a and CD1b, starting with material synthesized in Escherichia coli. The results suggest that "empty" MHC class I-like molecules can assemble and remain stable at physiological temperatures in the absence of ligand. The use of oxidative refolding chromatography thus is extended to encompass complex multisubunit proteins and specifically to members of the extensive, functionally diverse and important immunoglobulin supergene family of proteins, including those for which a ligand has yet to be identified.
