Design of natural killer T cell activators: structure and function of a microbial glycosphingolipid bound to mouse CD1d

Proceedings of the National Academy of Sciences of the United States of America
Douglass WuChi-Huey Wong

Abstract

Natural killer T (NKT) cells provide an innate-type immune response upon T cell receptor interaction with CD1d-presented antigens. We demonstrate through equilibrium tetramer binding and antigen presentation assays with Valpha14i-positive NKT cell hybridomas that the Sphingomonas glycolipid alpha-galacturonosyl ceramide (GalA-GSL) is a NKT cell agonist that is significantly weaker than alpha-galactosylceramide (alpha-GalCer), the most potent known NKT agonist. For GalA-GSL, a shorter fatty acyl chain, an absence of the 4-OH on the sphingosine tail and a 6'-COOH group on the galactose moiety account for its observed antigenic potency. We further determined the crystal structure of mCD1d in complex with GalA-GSL at 1.8-A resolution. The overall binding mode of GalA-GSL to mCD1d is similar to that of the short-chain alpha-GalCer ligand PBS-25, but its sphinganine chain is more deeply inserted into the F' pocket due to alternate hydrogen-bonding interactions between the sphinganine 3-OH with Asp-80. Subsequently, a slight lateral shift (>1 A) of the galacturonosyl head group is noted at the CD1 surface compared with the galactose of alpha-GalCer. Because the relatively short C(14) fatty acid of GalA-GSL does not fully occupy the A'...Continue Reading

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