Journal
JOURNAL OF MOLECULAR BIOLOGY
Volume 331, Issue 3, Pages 623-641Publisher
ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
DOI: 10.1016/S0022-2836(03)00750-2
Keywords
HLA polymorphism; T-cell receptor; sequence variability; alloreactivity; major histocompatibility complex
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Funding
- NIAID NIH HHS [AI50900] Funding Source: Medline
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Major histocompatibility complex class I (MHCI) and class II (MHCII) molecules display peptides on antigen-presenting cell surfaces for subsequent T-cell recognition. Within the human population, allelic variation among the classical MHCI and II gene products is the basis for differential peptide binding, thymic repertoie bias and allograft rejection. While available 3D structural analysis suggests that polymorphisms are found primarily within the peptide-binding site, a broader informatic approach pinpointing functional polymorphisms relevant for immune recognition is currently lacking. To this end, we have now analyzed known human class I (774) and class II (485) alleles at each amino acid position using a variability metric (V). Polymorphisms (V > 1) have been identified in residues that contact the peptide and/or T-cell receptor (TCR). Using sequence logos to investigate TCR contact sites on HLA molecules, we have identified conserved MHCl residues distinct from those of conserved MHCII residues. In addition, specific class II (HLA-DP, -DQ, -DR) and class I (HLA-A, -13, -C) contacts for TCR binding are revealed. We discuss these findings in the context of TCR restriction and alloreactivity. (C) 2003 Elsevier Ltd. All rights reserved.
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