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. 1988 Sep;82(3):987–992. doi: 10.1172/JCI113708

In vitro mutagenesis of HLA-B27. Substitution of an unpaired cysteine residue in the alpha 1 domain causes loss of antibody-defined epitopes.

J D Taurog 1, F A el-Zaatari 1
PMCID: PMC303612  PMID: 2458390

Abstract

The HLA class I molecules identified serologically as HLA-B27 are highly associated with ankylosing spondylitis and related human disorders. All known HLA-B27 amino acid sequences contain a cysteine residue at position 67; no other published HLA class I sequence contains a cysteine within the hypervariable region of the alpha 1 domain, which extends from amino acid residues 63-84. To investigate the role of this cysteine residue in the antigenic structure of HLA-B27, we isolated a genomic clone encoding a molecule of the HLA-B27.1 subtype and performed oligonucleotide-directed mutagenesis to convert the cysteine at position 67 to a tyrosine. When transfected into mouse L cells, both the wild-type and Cys67----Tyr67 mutant B27 genes directed the synthesis and surface expression of molecules reactive with the monomorphic anti-HLA class I antibody W6/32. However, only the L cells transfected with the wild-type B27 gene reacted with the anti-B27 antibody ME1; L cells transfected with the mutant B27 were completely unreactive with this antibody. Experiments with hybrid exons created from the HLA-B27 and HLA-A2 genes yielded results consistent with the mapping of the ME1 epitope to the B27 alpha 1 domain. A second anti-B27 antibody, GS145.2, also showed markedly reduced binding to the Cys67----Tyr67 mutant. These studies document the importance of the unique Cys67 residue in the antigenic structure of HLA-B27.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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