International Immunology, Vol. 13, No. 7, 853-861,
July 2001
© 2001 Japanese Society for Immunology
Crucial amino acid residues of mouse CD1d for glycolipid ligand presentation to V
14 NKT cells
2 Department of Dermatology, School of Medicine, Chiba University, 1-8-1 Inohana, Chuo-ku, Chiba 260-8670, Japan
3 Pharmaceutical Research Laboratory, Kirin Brewery Co., Ltd, 3 Miyahara, Gunma 370-12, Japan
4 La Jolla Institute for Allergy and Immunology, 10355 Science Center Drive, San Diego, CA 92121, USA
Correspondence to: M. Taniguchi
A novel lymphocyte, NKT cells bearing an invariant V
14 antigen receptor, specifically recognizes
-galactosylceramide (
-GalCer) exclusively presented by mouse CD1d (mCD1d). However, the precise molecular interaction remains unclear. For the basis of functional analyses, a docking model of
-GalCer with the crystal structure of mCD1d was constructed. Possible residues involved in the
-GalCermCD1d interaction were found to be Arg79, Glu83 and Asp80 for carbohydrate recognition, and Asp153 for interaction with the amide group on the fatty acyl chain. The
-GalCer-presenting ability of various transfectants expressing mutant mCD1d was completely abrogated if a single amino acid mutation was induced at positions 79, 80, 83 or 153, suggesting that the polar amino acids above the F' pocket are crucial for
-GalCer presentation to activate V
14 NKT cells. The possibility that Glu83 is a contact site for the NKT cell receptor is also discussed.
Keywords:
-galactosylceramide, NKT cell receptor, docking modeling
The first two authors contributed equally to this work
Transmitting editor: M. Miyasaka
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