Abstract
CYTOTOXIC T lymphocytes (CTL) expressing the CD8 glycoprotein recognize peptide antigens presented by class I major histocompatibility complex (MHC) molecules1,2. This correlation and the absence of CD8 polymorphism led to the hypothesis that CD8 binds to a conserved site of class I MHC molecules. Using a cell–cell binding assay we previously demonstrated specific interaction between human class I MHC (HLA-A,B,C) molecules and CD8 (ref. 3). Subsequent analysis of the products of 17 HLA-A,B alleles revealed a natural polymorphism for CD8 binding in the human population. Two molecules, HLA-Aw68.l and HLA-Aw68.2, which do not bind CD8, have a valine residue at position 245 whereas all other HLA-A,B,C molecules have alanine. Site-directed mutagenesis shows that this single substitution in the α3 domain is responsible for the CD8 binding phenotype and also affects recognition by alloreactive and influenza-specific CTL. Our results indicate that CD8 binds to the α3 domain of class I MHC molecules.
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Salter, R., Norment, A., Chen, B. et al. Polymorphism in the α3 domain of HLA-A molecules affects binding to CD8. Nature 338, 345–347 (1989). https://doi.org/10.1038/338345a0
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DOI: https://doi.org/10.1038/338345a0
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