Position 45 influences the peptide binding motif of HLA-B*44:08
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Position 45 represents a highly polymorphic residue within HLA class I alleles, which contacts the p2 position of bound peptides in 85% of the peptide–HLA structures analyzed, while the neighboring residues 41 and 46 are not involved in peptide binding. To investigate the influence of residue 45 at the functional level, we sequenced peptides eluted from recombinant HLA-B*44:0841Ala/45Met/46Ala molecules and compared their features with known peptides from B*44:0241Thr/45Lys/46Glu. While HLA-B*44:02 has an anchor motif of E at the p2 anchor position, HLA-B*44:08 exhibits Q and L as anchor motif. The 45Met/Lys polymorphism contributes to the alteration in the peptide-binding motif and provides further evidence that mismatches at position 45 should be considered as nonpermissive in a transplantation setting.
KeywordsPolymorphism Peptide-binding motif Stem cell transplantation
The authors would like to thank Susanne Aufderbeck for the excellent technical assistance. This work was supported by a grant from the German Federal Ministry of Education and Research (reference number: 01E00802).
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