T-cell recognition of Ia molecules selectively altered by a single amino acid substitution

Melissa A. Brown*, Laurie A. Glimcher, Ellen A. Nielsen, Wiliam E. Paul, Ronald N. Germain

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

25 Scopus citations


T lymphocytes recognize foreign antigen together with allele-specific determinants on membrane-bound class I and class II (Ia) gene products of the major histocompatibility complex. To identify amino acids of class II molecules critical to this recognition process, the genes encoding the β chains ofthe I-Ak molecule were cloned from a wild-type B-cell hybridoma and from an immunoselected variant subline showing distinct serological and T-cell stimulatory properties. Nucleotide sequencing and DNA-mediated gene transfer established that a single base transition (G → A) encoding a change from glutamic acid to lysine at position 67 in the I-Aβk molecule accounted for all the observed phenotypic changes of the variant cells. These results confirm the importance of residues 62 to 78 in the amino teminal domain of I-Aβ for class II-restricted T-cell recognition of antigen and demonstrate the ability of a single substitution in this region to alter this recognition event.

Original languageEnglish (US)
Pages (from-to)255-258
Number of pages4
Issue number4735
StatePublished - 1986

ASJC Scopus subject areas

  • General


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