The role of I-A(g7) β chain in peptide binding and antigen recognition by T cells

Osami Kanagawa, Jun Shimizu, Emil R. Unanue

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12 Scopus citations


We examine here how the β chain of the class II MHC molecule I-A(g7) influences T cell recognition. Three sets of T cell clones were identified. The first set recognizes peptides bound to I-A(g7), I-A(d) and I-A(g7) mutant in which the allele-specific residues His and Ser at position 56 and 57 were changed to the Pro at residue 56 and to non-polymorphic Asp at residue 57. The second set responds to the antigen presented only by I-A(g7) and does not recognize the peptides bound to the other class II molecules. The third set is also specific for I-A(g7) as a result of the poor binding of the peptide to I-A(d) and the mutant I-A(g7). These results indicate that positions 56 and 57 of the I-A(g7) class II MHC β chain play a role in both T cell recognition of the MHC-peptide complex and peptide binding to MHC. These two different functions may be involved in I-A(g7)-restricted β cell antigen recognition by diabetogenic T cell clones.

Original languageEnglish
Pages (from-to)1523-1526
Number of pages4
JournalInternational Immunology
Issue number10
StatePublished - 1997


  • I-A(g7)
  • Peptide binding
  • Residue 56
  • Residue 57
  • T cell


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