Major histocompatibility complex class I binding glycopeptides for the estimation of 'empty' class I molecules

Ussama M. Abdel-Motal, Louise Berg, Marita Bengtsson, Jan Dahmén, Jan Kihlberg, Göran Magnusson, Ulf Nilsson, Mikael Jondal

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6 Citations (Scopus)

Abstract

Different forms of major histocompatibility complex (MHC) class I heavy chains are known to be expressed on the cell surface, including molecules which are functionally 'empty'. Direct peptide binding to cells is obvious during sensitization of target cells in vitro for cytotoxic T lymphocyte killing and 'empty' MHC-I molecules are comparatively abundant on TAP- 1 2 peptide transporter mutant cells. In the present work we have estimated the fraction of 'empty' MHC class I molecules using glycosylated peptides and cellular staining with carbohydrate specific monoclonal antibodies. Synthetic Db and Kb binding peptides were coupled at different positions with different di- or trisaccharides, using different spacing between the carbohydrate and the peptide backbone. Binding of sugar specific mAbs was compared in ELISA and cellular assays. An optimal Db binding glycopeptide was used for comparative staining with anti-Db and anti-carbohydrate monoclonal antibodies to estimate fractions of 'empty' molecules on different T lymphoid cells. On activated normal T cells, a large fraction of Db molecules were found to be 'empty'. The functional cole of such 'empty' MHC class I molecules on T cells is presently unclear. However, on antigen presenting cells they might participate in the antigen presentation process.

Original languageEnglish
Pages (from-to)21-31
Number of pages11
JournalJournal of Immunological Methods
Volume188
Issue number1
DOIs
Publication statusPublished - 15 Dec 1995
Externally publishedYes

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Keywords

  • Binding
  • Glycopeptide
  • Major histocompatibility complex class I

ASJC Scopus subject areas

  • Immunology and Allergy
  • Immunology

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