Abstract
Glycosphingolipids (GSLs) from the Sphingomonadaceae family of bacteria have been reported to be potent stimulators of natural killer T cells. These glycolipids include mono-, tri- and tetraglycosylceramides. Here we have prepared the GSL-1 to GSL-4 series of glycolipids and tested their abilities to stimulate natural killer T cells. Among these glycolipids, only GSL-1 (1) is a potent stimulator. Using a series of synthetic diglycosylceramides, we show that oligoglycosylceramides from Sphingomonadaceae are not effectively truncated to GSL-1 in lysosomes in antigen-presenting cells, possibly because the higher-order GSLs are poor substrates for lysosomal acyltransfer enzymes.
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Acknowledgements
We acknowledge financial support from the National Institutes of Health (NIAID AI053725). J.M. is a Cancer Research Institute fellow and was supported by a grant from the Lupus Research Institute. A.B. is a Howard Hughes Medical Institute Investigator.
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X.L., S.D., Z.Z. and R.D.G. synthesized glycolipids; J.M. and D.Z determined NKT cell stimulatory activity of glycolipids; N.M. isolated glycolipids; L.T., A.B. and P.B.S. designed the project.
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Supplementary Figs. 1–5, Supplementary Scheme 1 and Supplementary Methods (PDF 4072 kb)
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Long, X., Deng, S., Mattner, J. et al. Synthesis and evaluation of stimulatory properties of Sphingomonadaceae glycolipids. Nat Chem Biol 3, 559–564 (2007). https://doi.org/10.1038/nchembio.2007.19
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DOI: https://doi.org/10.1038/nchembio.2007.19
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