Abstract
We have constructed a hybrid E beta gene by replacing the second exon of the Ed beta gene (which encodes the majority of the beta 1 protein domain) with the corresponding exon from the Eb beta gene. The hybrid gene has been introduced into a d haplotype host, the lymphoma beta-cell line A20-2J, and an E alpha E beta dimer composed of the endogenous Ed alpha chain and the product of the hybrid Ed beta/Eb beta gene was immunoprecipitated from extracts of transfected cells with an Ed alpha Eb beta-specific monoclonal antibody. Transfected cells have acquired the ability to present antigen to Ed alpha Eb beta-restricted helper T-cell hybridomas, indicating that the second exon of the gene for the E beta chain encodes sequences required for the restricted recognition of the antigen-presenting cell by the class II-restricted responder T-cell.
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