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2017 ; 8
(ä): 984
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Human Leukocyte Antigen (HLA)-DRB1*15:01 and HLA-DRB5*01:01 Present Complementary
Peptide Repertoires
#MMPMID28871256
Scholz EM
; Marcilla M
; Daura X
; Arribas-Layton D
; James EA
; Alvarez I
Front Immunol
2017[]; 8
(ä): 984
PMID28871256
show ga
Human leukocyte antigen (HLA)-DR15 is a haplotype associated with multiple
sclerosis. It contains the two DRB* genes DRB1*1501 (DR2b) and DRB5*0101 (DR2a).
The reported anchor motif of the corresponding HLA-DR molecules was determined in
1994 based on a small number of peptide ligands and binding assays. DR2a could
display a set of peptides complementary to that presented by DR2b or,
alternatively, a similar peptide repertoire but recognized in a different manner
by T cells. It is known that DR2a and DR2b share some peptide ligands, although
the degree of similarity of their associated peptidomes remains unclear. In
addition, the contribution of each molecule to the global peptide repertoire
presented by the HLA-DR15 haplotype has not been evaluated. We used mass
spectrometry to analyze the peptide pools bound to DR2a and DR2b, identifying 169
and 555 unique peptide ligands of DR2a and DR2b, respectively. The analysis of
these sets of peptides allowed the refinement of the corresponding binding motifs
revealing novel anchor residues that had been overlooked in previous analyses.
Moreover, the number of shared ligands between both molecules was low, indicating
that DR2a and DR2b present complementary peptide repertoires to T cells. Finally,
our analysis suggests that, quantitatively, both molecules contribute to the
peptide repertoire presented by cells expressing the HLA-DR15 haplotype.