Abstract
B*38:01 and B*39:06 are present with phenotypic frequencies <2 % in the general population, but are of interest as B*39:06 is the B allele most associated with type 1 diabetes susceptibility and 38:01 is most protective. A previous study derived putative main anchor motifs for both alleles based on peptide elution data. The present study has utilized panels of single amino acid substitution peptide libraries to derive detailed quantitative motifs accounting for both primary and secondary influences on peptide binding. From these analyses, both alleles were confirmed to utilize the canonical position 2/C-terminus main anchor spacing. B*38:01 preferentially bound peptides with the positively charged or polar residues H, R, and Q in position 2 and the large hydrophobic residues I, F, L, W, and M at the C-terminus. B*39:06 had a similar preference for R in position 2, but also well-tolerated M, Q, and K. A more dramatic contrast between the two alleles was noted at the C-terminus, where the specificity of B*39:06 was clearly for small residues, with A as most preferred, followed by G, V, S, T, and I. Detailed position-by-position and residue-by-residue coefficient values were generated from the panels to provide detailed quantitative B*38:01 and B*39:06 motifs. It is hoped that these detailed motifs will facilitate the identification of T cell epitopes recognized in the context of two class I alleles associated with dramatically different dispositions towards type 1 diabetes, offering potential avenues for the investigation of the role of CD8 T cells in this disease.
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Acknowledgments
The experiments described herein comply with the current laws of the United States of America. This work was supported by the National Institutes of Health (National Institutes for Allergy and Infectious Diseases) contracts and grants HHSN272201400045C (A.S.), R01 DK094327, R01 DK064315, and R03 AI119225 to T.P.D.; T32 GM007288 and F30 DK103368, which supported J.S.; and P60 DK020541, which supports the Diabetes Research Center of the Albert Einstein College of Medicine. T.P.D. is the Diane Belfer, Cypres and Endelson Families Faculty Scholar in Diabetes Research.
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Supplemental Table 1. B*38:01 SAAS IC50 nM. Supplemental Table 2. B*39:06 SAAS IC50 nM. Supplemental Table 3. Pilot validation peptides. (XLSX 45 kb)
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Sidney, J., Schloss, J., Moore, C. et al. Characterization of the peptide binding specificity of the HLA class I alleles B*38:01 and B*39:06. Immunogenetics 68, 231–236 (2016). https://doi.org/10.1007/s00251-015-0898-2
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DOI: https://doi.org/10.1007/s00251-015-0898-2