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- W2089144950 abstract "The study of peptide binding to HLA class II molecules has mostly concentrated on DR molecules. Since many autoimmune diseases show a primary association to particular DQ molecules rather than DR molecules, it is also important to study the peptide-binding properties of DQ molecules. Here we report a biochemical peptide-binding assay for the type I diabetes-associated DQ8, i.e. DQ (alpha1*0301, beta1*0302), molecule. Affinity-purified DQ8 molecules were tested in peptide-binding assays using a radiolabelled influenza haemagglutinin (Ha) peptide encompassing positions 255-271(Y) as an indicator peptide. The Ha 255-271(Y) peptide bound to DQ8 in a pH-dependent fashion showing optimal binding around pH 5. The association kinetics were relatively slow and the resulting complexes were heat labile. The specificity of peptide binding to DQ8 was investigated in competitive inhibition experiments with a panel of 43 peptides of different lengths and sequences. The DQ8 molecules showed a different pattern of peptide binding compared to a previously studied DQ2 molecule. Peptides derived from thyroid peroxidase, HLA-DQ(alpha1*0301), HLA-DQ(alpha1*0302), retinol receptor and p21ras were among the high-affinity binders, whereas peptides derived from myelin basic protein were among the low-affinity binders. The sequence of the high-affinity peptides conformed with a previously published peptide-binding motif of DQ8." @default.
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- W2089144950 date "1998-06-01" @default.
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- W2089144950 title "A Peptide‐Binding Assay for the Disease‐Associated HLA‐DQ8 Molecule" @default.
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- W2089144950 doi "https://doi.org/10.1046/j.1365-3083.1998.00342.x" @default.
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