Abstract
Glycolipids presented by the major histocompatibility complex (MHC) class I homolog CD1d are recognized by natural killer T cells (NKT cells) characterized by either a semi-invariant T cell antigen receptor (TCR) repertoire (type I NKT cells or iNKT cells) or a relatively variable TCR repertoire (type II NKT cells). Here we describe the structure of a type II NKT cell TCR in complex with CD1d-lysosulfatide. Both TCR α-chains and TCR β-chains made contact with the CD1d molecule with a diagonal footprint, typical of MHC-TCR interactions, whereas the antigen was recognized exclusively with a single TCR chain, similar to the iNKT cell TCR. Type II NKT cell TCRs, therefore, recognize CD1d-sulfatide complexes by a distinct recognition mechanism characterized by the TCR-binding features of both iNKT cells and conventional peptide-reactive T cells.
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Acknowledgements
We thank the Stanford Synchrotron Radiation Lightsource (beamline 7-1) and the Advanced Light Source (beamline 5.0.3) for support during remote collection of data; M. Kronenberg (La Jolla Institute for Allergy & Immunology) for several CD1d mutants; R. Stanfield (The Scripps Research Institute) for computer scripts used for the measurement of docking angles; and N. Vu and J. Nourblin (La Jolla Institute for Allergy & Immunology) for help during cloning and protein expression. Supported by the US National Institutes of Health (AI074952 to D.M.Z. and CA100660 to V.K.), the Juvenile Diabetes Research Foundation (V.K.) and the Multiple Sclerosis National Research Institute (V.K.).
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E.G. generated the TCR constructs, purified and crystallized the proteins, determined the structures and did surface plasmon resonance experiments; I.M. did the antigen-presentation assays; J.W. and P.I. provided assistance with mutant generation and protein purification; T.-T.M. sequenced the TCR; and E.G., V.K. and D.M.Z. analyzed the data and wrote the manuscript.
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Girardi, E., Maricic, I., Wang, J. et al. Type II natural killer T cells use features of both innate-like and conventional T cells to recognize sulfatide self antigens. Nat Immunol 13, 851–856 (2012). https://doi.org/10.1038/ni.2371
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DOI: https://doi.org/10.1038/ni.2371
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