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Publication Abstract from PubMed

The semi-invariant natural killer T cell receptor (NKT TCR) recognizes CD1d-lipid antigens. Although the TCR alpha chain is typically invariant, the beta chain expression is more diverse, where three V beta chains are commonly expressed in mice. We report the structures of V alpha 14-V beta 8.2 and V alpha 14-V beta 7 NKT TCRs in complex with CD1d-alpha-galactosylceramide (alpha-GalCer) and the 2.5 A structure of the human NKT TCR-CD1d-alpha-GalCer complex. Both V beta 8.2 and V beta 7 NKT TCRs and the human NKT TCR ligated CD1d-alpha-GalCer in a similar manner, highlighting the evolutionarily conserved interaction. However, differences within the V beta domains of the V beta 8.2 and V beta 7 NKT TCR-CD1d complexes resulted in altered TCR beta-CD1d-mediated contacts and modulated recognition mediated by the invariant alpha chain. Mutagenesis studies revealed the differing contributions of V beta 8.2 and V beta 7 residues within the CDR2 beta loop in mediating contacts with CD1d. Collectively we provide a structural basis for the differential NKT TCR V beta usage in NKT cells.

Differential recognition of CD1d-alpha-galactosyl ceramide by the V beta 8.2 and V beta 7 semi-invariant NKT T cell receptors.,Pellicci DG, Patel O, Kjer-Nielsen L, Pang SS, Sullivan LC, Kyparissoudis K, Brooks AG, Reid HH, Gras S, Lucet IS, Koh R, Smyth MJ, Mallevaey T, Matsuda JL, Gapin L, McCluskey J, Godfrey DI, Rossjohn J Immunity. 2009 Jul 17;31(1):47-59. PMID:19592275^[2]

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.