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- W1593721388 abstract "Abstract A fundamental characteristic of MHC class I and class II proteins is their unusual capacity to form stable complexes with a wide spectrum of peptide ligands. In this study, sets of peptide analogues containing long chain-biotinylated lysine individually substituted for each amino acid in the sequence have been used to explore the structural requirements for the formation of peptide-MHC class II protein complexes. Based on the ability of the analogs to bind both the MHC protein and fluorescent streptavidin, receptor contact residues were identified and from their spacing the conformation of the bound peptides could be inferred. Six separate peptides were studied; three defined by HLA-DR1Dw1-restricted T cells, and three identified by T cells restricted through alleles other than HLA-DR1Dw1. The similar patterns of fluorescent signals observed when the former three peptides were studied indicated that they shared conformational features when bound to HLA-DR1Dw1. In contrast when the latter three peptides were examined, the data indicated that they shared some but not all of the conformational features characteristic of the peptides known to elicit HLA-DR1Dw1-restricted T cells. When the peptide sequences were aligned based on the critical contact residues, two positions of structural homology were apparent. In each sequence, an amino acid with a bulky hydrophobic side chain could be identified separated by four residues from a small amino acid. These minimal structural requirements were consistent with recent experiments demonstrating that only a small number of side chains in the peptide were necessary for binding to the MHC protein." @default.
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- W1593721388 date "1991-07-01" @default.
- W1593721388 modified "2023-10-16" @default.
- W1593721388 title "Conformational and structural characteristics of peptides binding to HLA-DR molecules." @default.
- W1593721388 doi "https://doi.org/10.4049/jimmunol.147.1.189" @default.
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