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J Mol Biol. 2014 Aug 26;426(17):3016-27. doi: 10.1016/j.jmb.2014.06.020. Epub 2014 Jul 11.

Structural basis for the specific recognition of the major antigenic peptide from the Japanese cedar pollen allergen Cry j 1 by HLA-DP5.

Author information

1
RIKEN Systems and Structural Biology Center, 1-7-22 Suehiro-cho, Tsurumi-ku, Yokohama 230-0045, Japan; Division of Structural and Synthetic Biology, RIKEN Center for Life Science Technologies, 1-7-22 Suehiro-cho, Tsurumi-ku, Yokohama 230-0045, Japan.
2
Department of Evolutionary Studies of Biosystems, Center for Promotion of Integrated Sciences, The Graduate University for Advanced Studies, Shonan Village, Hayama, Kanagawa 240-0193, Japan.
3
RIKEN Systems and Structural Biology Center, 1-7-22 Suehiro-cho, Tsurumi-ku, Yokohama 230-0045, Japan; RIKEN Structural Biology Laboratory, 1-7-22 Suehiro-cho, Tsurumi-ku, Yokohama 230-0045, Japan.
4
Division of Genome Analysis, Research Center for Genetic Information, Medical Institute of Bioregulation, Kyushu University, 3-1-1 Maidashi, Higashi-ku, Fukuoka 812-8582, Japan.
5
Department of Immunogenetics, Graduate School of Medical Sciences, Kumamoto University, 1-1-1 Honjo, Chuo-ku, Kumamoto 860-8556, Japan.
6
Institute for Advanced Study, Kyushu University, 3-1-1 Maidashi, Higashi-ku, Fukuoka 812-8582, Japan.
7
RIKEN Systems and Structural Biology Center, 1-7-22 Suehiro-cho, Tsurumi-ku, Yokohama 230-0045, Japan; RIKEN Structural Biology Laboratory, 1-7-22 Suehiro-cho, Tsurumi-ku, Yokohama 230-0045, Japan. Electronic address: yokoyama@riken.jp.

Abstract

The major allergen, Cry j 1, was isolated from Japanese cedar Cryptomeria japonica (Cry j) pollen and was shown to react with immunoglobulin E antibodies in the sera from pollinosis patients. We previously reported that the frequency of HLA-DP5 was significantly higher in pollinosis patients and the immunodominant peptides from Cry j 1 bound to HLA-DP5 to activate Th2 cells. In the present study, we determined the crystal structure of the HLA-DP5 heterodimer in complex with a Cry j 1-derived nine-residue peptide, at 2.4Å resolution. The peptide-binding groove recognizes the minimal peptide with 10 hydrogen bonds, including those between the negatively charged P1 pocket and the Lys side chain at the first position in the peptide sequence. We confirmed that HLA-DP5 exhibits the same Cry j 1-binding mode in solution, through pull-down experiments using structure-based mutations of Cry j 1. We also identified the characteristic residues of HLA-DP5 that are responsible for the distinct properties of the groove, by comparing the structure of HLA-DP5 and the previously reported structures of HLA-DP2 in complexes with pDRA of the self-antigen. The comparison revealed that the HLA-DP5·pCry j 1 complex forms several hydrogen bond/salt bridge networks between the receptor and the antigen that were not observed in the HLA-DP2·pDRA complex. Evolutionary considerations have led us to conclude that HLA-DP5 and HLA-DP2 represent two major groups of the HLA-DP family, in which the properties of the P1 and P4 pockets have evolved and acquired the present ranges of epitope peptide-binding specificities.

KEYWORDS:

Cry j 1; HLA-DP5; X-ray crystallography; cedar pollen; evolutionary analysis

PMID:
25020231
DOI:
10.1016/j.jmb.2014.06.020
[Indexed for MEDLINE]
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