Conserved and heterogeneous lipid antigen specificities of CD1d-restricted NKT cell receptors

The Journal of Immunology : Official Journal of the American Association of Immunologists
Manfred BriglJenny E Gumperz

Abstract

CD1d-restricted NKT cells use structurally conserved TCRs and recognize both self and foreign glycolipids, but the TCR features that determine these Ag specificities remain unclear. We investigated the TCR structures and lipid Ag recognition properties of five novel Valpha24-negative and 13 canonical Valpha24-positive/Vbeta11-positive human NKT cell clones generated using alpha-galactosylceramide (alpha-GalCer)-loaded CD1d tetramers. The Valpha24-negative clones expressed Vbeta11 paired with Valpha10, Valpha2, or Valpha3. Strikingly, their Valpha-chains had highly conserved rearrangements to Jalpha18, resulting in CDR3alpha loop sequences that are nearly identical to those of canonical TCRs. Valpha24-positive and Valpha24-negative clones responded similarly to alpha-GalCer and a closely related bacterial analog, suggesting that conservation of the CDR3alpha loop is sufficient for recognition of alpha-GalCer despite CDR1alpha and CDR2alpha sequence variation. Unlike Valpha24-positive clones, the Valpha24-negative clones responded poorly to a glucose-linked glycolipid (alpha-glucosylceramide), which correlated with their lack of a conserved CDR1alpha amino acid motif, suggesting that fine specificity for alpha-linked glycosphingo...Continue Reading

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