Distinguishing self from nonself: Immunogenicity of the murine H47 locus is determined by a single amino acid substitution in an unusual peptide

L. M. Mendoza, G. Villaflor, P. Eden, D. Roopenian, N. Shastri

Research output: Contribution to journalArticle

Abstract

Histocompatibility (H) Ags are responsible for chronic graft rejection and graft vs host disease in solid tissue and bone marrow transplantation among MHC-matched individuals. Here we defined the molecular basis of self-nonself discrimination for the murine chromosome 7 encoded H47 histocompatibility locus, known by its trait of graft-rejection for over 40 years. H47 encodes a novel, highly conserved cell surface protein containing the SCILLYIVI (SII9) nonapeptide in its transmembrane region. The p7 isoleucine-to-phenylalanine substitution in SII9 defined the antigenic polymorphism and T cell specificity. Despite absence of the canonical consensus motif and weak binding to Db MHC I, both H47 peptides were presented to CTLs. However, unlike all the other known H loci, the relative immunogenicity of both H47 alleles varied dramatically and was profoundly influenced by neighboring H loci. The results provide insights into the peptide universe that defines nonself and the basis of histoincompatibility.

Original languageEnglish (US)
Pages (from-to)4438-4445
Number of pages8
JournalJournal of Immunology
Volume166
Issue number7
DOIs
StatePublished - Apr 1 2001

ASJC Scopus subject areas

  • Immunology and Allergy
  • Immunology

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