Abstract
In this study we have sequenced peptides eluted from a truncated recombinant HLA-A*6602 molecule, and compared their features with data reported for peptides presented in the A*6601 molecule. A striking change in the amino-acid binding preferences was observed at peptide position P1, which interacts with pocket A of the HLA peptide-binding region. For A*6601, aspartic acid and glutamic acid, both of which possess polar acidic side-chains, have been described as auxiliary anchors. This is in marked contrast to A*6602, where we observed serine, which has a neutral polar side-chain, as auxiliary anchor at P1. Accordingly, this shift in the physico-chemical properties of the auxiliary anchor may be best explained by the HLA amino-acid polymorphism at position 163, where arginine (hydrophilic, alkaline) in A*6601 has been replaced by glutamic acid in A*6602. This amino-acid exchange results in a shift towards higher acidity in pocket A, apparently resulting in the loss of preference for acidic auxiliary anchors, and leading to the preference for the neutral amino acid serine. The change of the auxiliary anchor residue at P1 is likely to alter the spectrum of peptides presented by A*6602 compared with A*6601, which may result in allogenicity in the case of a mismatch in allogeneic stem cell transplantation.
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Acknowledgements
The authors would like to thank Joachim Kuhn for his critical advice concerning the HPLC analysis, and Eva Szczepanek for excellent technical assistance. We acknowledge Vera Rebmann for isoelectric focusing analyses, and Hidde Ploegh for providing the mAb HC10. This study was supported by a grant from the Deutsche Forschungsgemeinschaft (SFB 265 2001, Projekt A12).
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Bade-Doeding, C., Elsner, HA., Eiz-Vesper, B. et al. A single amino-acid polymorphism in pocket A of HLA-A*6602 alters the auxiliary anchors compared with HLA-A*6601 ligands. Immunogenetics 56, 83–88 (2004). https://doi.org/10.1007/s00251-004-0677-y
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DOI: https://doi.org/10.1007/s00251-004-0677-y