Evolutionary conservation of major histocompatibility complex- DR/peptide/T cell interactions in primates

doi:10.1084/jem.177.4.979

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Evolutionary conservation of major histocompatibility complex- DR/peptide/T cell interactions in primates

A Geluk, DG Elferink, BL Slierendregt, KE van Meijgaarden, RR de Vries, TH Ottenhoff and RE Bontrop
Department of Immunohematology and Blood Bank, University Hospital, Leiden, The Netherlands.

Many major histocompatibility complex (MHC) polymorphisms originate from ancient structures that predate speciation. As a consequence, members of the Mhc-DRB1*03 allelic lineage are not only present in humans but in chimpanzees and rhesus macaques as well. This emphasizes that Mhc-DRB1*03 members must have been present in a common ancestor of these primate species that lived about 30 million years ago. Due to the accumulation of genetic variation, however, alleles of the Mhc-DRB1*03 lineage exhibit species-unique sequences. To investigate the biological importance of such conservation and variation, we have studied both the binding and antigen presentation capacity of various trans-species Mhc- DRB1*03 lineage members. Here we show that p3-13 of the 65-kD heat- shock protein (hsp65) of Mycobacterium leprae and M. tuberculosis binds not only to HLA-DR17(3) but also to some chimpanzee and rhesus macaque class II-positive cells. Comparison of the corresponding human, chimpanzee, and rhesus macaque Mhc-DRB1*03 lineage members revealed the presence of uniquely shared amino acid residues, at positions 9-13 and 26-31, of the antigen-binding site that are critical for p3-13 binding. In addition it is shown that several nonhuman primate antigen- presenting cells that bind p3-13 can activate HLA-DR17-restricted T cells. Certain amino acid replacements, however, in Mhc-DRB1*03 lineage members did not influence peptide binding or T cell recognition. Therefore, these studies demonstrate that some polymorphic amino acid residues (motifs) within the antigen-binding site of MHC class II molecules that are crucial for peptide binding and recognition by the T cell receptor have been conserved for over 30 million years.
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