Abstract
Heterodimeric class I major histocompatibility complex molecules, which consist of a 45-kDa heavy-chain and a 12-kDa beta 2-microglobulin (beta 2m) light chain, bind endogenously synthesized peptides for presentation to antigen-specific T cells. We have synthesized a gene encoding a single-chain, soluble class I molecule derived from mouse H-2Dd, in which the carboxyl terminus of beta 2m is linked via a peptide spacer to the amino terminus of the heavy chain. The chimeric protein is secreted efficiently from transfected L cells, is thermostable, and when loaded with an appropriate antigenic peptide, stimulates an H-2Dd-restricted antigen-specific T-cell hybridoma. Thus, functional binding of peptide does not require the complete dissociation of beta 2m, implying that a heavy chain/peptide complex is not an obligate intermediate in the assembly of the heavy-chain/beta 2m/peptide heterotrimer. Single-chain major histocompatibility complex molecules uniformly loaded with peptide have potential uses for structural studies, toxin or fluor conjugates, and vaccines.
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