Abstract
The semi-invariant natural killer (NK) T-cell receptor (NKTcr) recognises structurally diverse glycolipid antigens presented by the monomorphic CD1d molecule. While the α-chain of the NKTcr is invariant, the Β-chain is more diverse, but how this diversity enables the NKTcr to recognise diverse antigens, such as an α-linked monosaccharide (α-galactosylceramide and α-galactosyldiacylglycerol) and the Β-linked trisaccharide (isoglobotriaosylceramide), is unclear. We demonstrate here that NKTcrs, which varied in their Β-chain usage, recognised diverse glycolipid antigens with a similar binding mode on CD1d. Nevertheless, the NKTcrs recognised distinct epitopic sites within these antigens, including α-galactosylceramide, the structurally similar α-galactosyldiacylglycerol and the very distinct isoglobotriaosylceramide. We also show that the relative roles of the CDR loops within the NKTcr Β-chain varied as a function of the antigen. Thus, while NKTcrs characteristically use a conserved docking mode, the NKTcr Β-chain allows these cells to recognise unique aspects of structurally diverse CD1d-restricted ligands.
Original language | English (US) |
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Pages (from-to) | 3579-3590 |
Number of pages | 12 |
Journal | EMBO Journal |
Volume | 28 |
Issue number | 22 |
DOIs | |
State | Published - Nov 2009 |
Keywords
- Antigen recognition
- Glycolipid antigens
- NKT cells
- Recognition logic
- Semi-invariant T-cell receptor
ASJC Scopus subject areas
- Neuroscience(all)
- Molecular Biology
- Biochemistry, Genetics and Molecular Biology(all)
- Immunology and Microbiology(all)