Abstract
HLA-Bw62 is a serologically defined class I antigen specificity, but we show that it represents a family of five distinct alleles in this study. Five variants of HLA-Bw62 antigens were identified by isoelectric focusing, and sequencing studies revealed that these are a family of closely related alleles differing from one another by one to six amino acid substitutions at eight positions: 63 in the α1 domain and 94, 95, 97, 99, 113, 152, and 156 in the α2 domain. These substitutions are located in the two α-helices and two adjacent β-strands, and the side chains of most amino acids face into the antigen binding groove. Functional assays using an in vitro generated Epstein-Barr virus (EBV)-specific Bw62-restricted cytotoxic T lymphocyte clone indicated that the minimal structural variations located in the antigen binding sites of the HLA-Bw62 variant molecules could affect the presentation of the nominal EBV antigen. This study revealed that the HLA-Bw62 antigen family consists of at least five closely related alleles, and further demonstrated that these alleles with minimal structural variations might play distinct functional roles in regard to antigen presentation.
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The nucleotide sequence data reported in this paper have been submitted to the GenBank nucleotide sequence database and have been assigned the accession number M83191–83195.
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Yoon Choo, S., Fan, La. & Hansen, J.A. Allelic variations clustered in the antigen binding sites of HLA-Bw62 molecules. Immunogenetics 37, 108–113 (1993). https://doi.org/10.1007/BF00216833
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DOI: https://doi.org/10.1007/BF00216833