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Atypical natural killer T-cell receptor recognition of CD1d?lipid antigens #MMPMID26875526
Le Nours J; Praveena T; Pellicci DG; Gherardin NA; Ross FJ; Lim RT; Besra GS; Keshipeddy S; Richardson SK; Howell AR; Gras S; Godfrey DI; Rossjohn J; Uldrich AP
Nat Commun 2016[]; 7 (ä): ä PMID26875526show ga
Crucial to Natural Killer T (NKT) cell function is the interaction between their T-cell receptor (TCR) and CD1d-antigen complex. However, the diversity of the NKT cell repertoire and the ensuing interactions with CD1d-antigen remain unclear. We describe an atypical population of CD1d??-galactosylceramide (?-GalCer)-reactive human NKT cells that differ markedly from the prototypical TRAV10-TRAJ18-TRBV25-1+ type I NKT cell repertoire. These cells express a range of TCR ?- and ?-chains that show differential recognition of glycolipid antigens. Two atypical NKT TCRs (TRAV21-TRAJ8-TRBV7?8 and TRAV12-3-TRAJ27-TRBV6-5) bind orthogonally over the A?-pocket of CD1d, adopting distinct docking modes that contrast with the docking mode of all type I NKT TCR-CD1d-antigen complexes. Moreover, the interactions with ?-GalCer differ between the type I and these atypical NKT TCRs. Accordingly, diverse NKT TCR repertoire usage manifests in varied docking strategies and specificities towards CD1d??-GalCer and related antigens, thus providing far greater scope for diverse glycolipid antigen recognition.