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The Journal of Immunology, Vol 152, Issue 9 4516-4525, Copyright © 1994 by American Association of Immunologists
ARTICLES |
J Sidney, C Oseroff, MF del Guercio, S Southwood, JI Krieger, GY Ishioka, K Sakaguchi, E Appella and A Sette
Cytel, San Diego, CA 92121.
A quantitative peptide binding assay using purified DQA1*0301/DQB1*0301 (DQ3.1) molecules was developed and validated by examining the correlation between the data obtained in the binding assay with those obtained in inhibition of Ag presentation assays. By the combined use of large libraries of synthetic peptides and of substitution and truncation analogues, a putative DQ3.1 motif was defined. Its most prominent feature is the requirement for two small and/or hydrophobic residues spaced at positions i + 2 and i + 4. This motif is quite different from the motif recognized by DR molecules, but similar to the motif previously defined for certain IA alleles (the putative mouse homologue of DQ). These data suggest that various class II isotypes have evolved to present different peptide structures to each other, thus maximizing the repertoire of different epitopes available to T cell scrutiny.
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