Photoactivable Glycolipid Antigens Generate Stable Conjugates with CD1d for Invariant Natural Killer T Cell Activation.

Photoactivable Glycolipid Antigens Generate Stable Conjugates with CD1d for Invariant Natural Killer T Cell Activation.
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DOI:
10.1021/acs.bioconjchem.8b00484
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发表时间:
2018-09-19
影响因子:
4.7
通讯作者:
Porcelli SA
Porcelli SA
中科院分区:
化学2区
文献类型:
--
作者:
Veerapen N;Kharkwal SS;Jervis P;Bhowruth V;Besra AK;North SJ;Haslam SM;Dell A;Hobrath J;Quaid PJ;Moynihan PJ;Cox LR;Kharkwal H;Zauderer M;Besra GS;Porcelli SA

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Activation of invariant natural killer T lymphocytes (iNKT cells) by α-galactosylceramide (α-GC) elicits a range of pro-inflammatory or anti-inflammatory immune responses. We report the synthesis and characterization of a series of α-GC analogues with acyl chains of varying length and a terminal benzophenone. These bound efficiently to the glycolipid antigen presenting protein CD1d, and upon photoactivation formed stable CD1d-glycolipid covalent conjugates. Conjugates of benzophenone α-GCs with soluble or cell-bound CD1d proteins retained potent iNKT cell activating properties, with biologic effects that were modulated by acyl chain length and the resulting affinities of conjugates for iNKT cell antigen receptors. Analysis by mass spectrometry identified a unique covalent attachment site for the glycolipid ligands in the hydrophobic ligand binding pocket of CD1d. The creation of covalent conjugates of CD1d with α-GC provides a new tool for probing the biology of glycolipid antigen presentation, as well as opportunities for developing effective immunotherapeutics.
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