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Burdin N , Brossay L , Degano M , Iijima H , Gui M , Wilson IA , Kronenberg M
Structural requirements for antigen presentation by mouse CD1
Proceedings of the National Academy of Sciences of the United States of America. 2000 Aug 29;97(18) :10156-10161
PMID: ISI:000089067500062   
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Abstract
The structural basis for the T cell response to glycolipid antigens (Ags) remains poorly understood. T lymphocytes autoreactive for mouse CD1 (mCD1.1) or reactive for the glycosphingolipid alpha-galactosylceramide (alpha-GalCer) presented by mCD1.1 have been described previously. In this paper it is shown that mutations at the top of the alpha helices and in the bottom of the Ag-binding groove can disrupt both mCD1.1 autoreactivity and alpha-GalCer recognition. The locations of the positions that affect T cell responses indicate that recognition of mCD1.1 is not likely to be unconventional or superantigen-like. Furthermore, the effects of the bottom of the pocket mutation suggest that the autoreactive response could require an autologous ligand, and they indicate that alpha-GalCer binds to the groove of mCD1.1, most likely with the shorter 18-carbon hydrophobic chain in the A' pocket, Natural killer T cell hybridomas with identical T cell antigen receptor (TCR) alpha chains and different beta chains respond differently to alpha-GalCer presented by mCD1.1 mutants. This finding indicates a role for TCR beta in defining natural killer T cell specificity, despite the more restricted diversity of the alpha chains in these cells. Overall, the data are consistent with a mode of lipoglycan recognition similar to that proposed for glycopeptides, in which the TCR alpha and beta chains survey a surface composed of both mCD1.1 and the carbohydrate portion of alpha-GalCer.
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Times Cited: 18 English Article 349WA PROC NAT ACAD SCI USA