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Functional cell surface expression by a recombinant single-chain class I major histocompatibility complex molecule
1Laboratory of Biochemistry, National Cancer Institute, National Institutes of Health, Bethesda, MD 20892.
European Journal of Immunology
|November 1, 1994
Summary
Researchers engineered a single-chain H-2Dd class I MHC molecule (SC beta Ddm) for T cell immunogen development. This novel molecule correctly folds, expresses on cell surfaces, and presents antigenic peptides, enabling targeted immune studies.
Area of Science:
- Immunology
- Molecular Biology
- Biochemistry
Background:
- Cell surface class I Major Histocompatibility Complex (MHC) molecules are crucial for T cell recognition.
- Engineering single-chain MHC molecules offers potential as novel T cell immunogens.
- Understanding MHC structure-function relationships requires precise molecular tools.
Purpose of the Study:
- To engineer a functional, cell surface-expressed single-chain class I MHC molecule (SC beta Ddm).
- To assess the folding, stability, and antigen-presenting capabilities of SC beta Ddm.
- To investigate the cis-acting properties of the beta 2-microglobulin (beta 2m) domain within SC beta Ddm.
Main Methods:
- Constructed a recombinant gene for SC beta Ddm, linking beta 2-microglobulin to the H-2Dd heavy chain via a peptide spacer.
- Transfected L cells with the SC beta Ddm gene and assessed surface expression and folding.
- Utilized H-2Dd-restricted T cell hybridomas to evaluate antigen presentation.
- Studied SC beta Ddm function in beta 2m-negative cells and peptide-transport-deficient cells.
Main Results:
- SC beta Ddm was correctly folded and stably expressed on the surface of transfected L cells.
- The single-chain molecule effectively presented antigenic peptides to specific T cells.
- SC beta Ddm facilitated antigen loading in peptide-transport-deficient cells.
- SC beta Ddm demonstrated stable expression and correct folding in beta 2m-negative cells, utilizing its own beta 2m domain.
- The beta 2m domain of SC beta Ddm exhibited strict cis activity, not rescuing endogenous MHC expression.
Conclusions:
- Engineered SC beta Ddm is a functional, cell surface-expressed class I MHC molecule.
- SC beta Ddm enables controlled antigen loading and presentation.
- The intrinsic beta 2m domain of SC beta Ddm allows for MHC class I studies in beta 2m-negative contexts.
- This engineered molecule facilitates investigation of MHC function in simplified cellular and potentially animal models.