Abstract
Specificity analyses of peptide binding to human leukocyte antigen (HLA)-A molecules have been hampered due to a lack of proper monoclonal antibodies (mAbs) for certain allomorphs, such as the prevalent HLA-A1 for Caucasians and HLA-A11 for Asians. We developed a mAb that recognizes a conformational epitope common to most HLA-A allomorphs. The mAb, named A-1, does not discriminate peptides by amino acid sequences, making it suitable for measuring peptide binding. A stabilization assay using TAP-deficient cell lines and A-1 was developed to investigate the specificity of peptide binding to HLA-A molecules. Regarding the evolution of HLA-A genes, the A-1 epitope has been conserved among most HLA-A allomorphs but was lost when the HLA-A gene diversified into the HLA-A*32, HLA-A*31, and HLA-A*33 lineages together with HLA-A*29 after bifurcating from the HLA-A*25 and HLA-A*26 branchs. The establishment of A-1 is expected to help researchers investigate the peptide repertoire and develop computational tools to identify cognate peptides. Since no HLA-A locus-specific mAb has been available, A-1 will also be useful for analyzing the locus-specific regulation of the HLA gene expression.
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Abbreviations
- HLA:
-
Human leukocyte antigen
- PBMC:
-
Peripheral blood mononuclear cell
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Acknowledgments
We thank Drs. P. Parham, P. Cresswell, M. Takiguchi, G. Nolan, N. Kashiwagi, and J. Strominger for generous gift of cell lines. We also thank Dr. Jun-ichi Miyazaki for providing the pCAGGSneo vector.
Funding
This study was supported by grants from the JSPS, MEXT (16H06498, KU), AMED (JP18lm0203008, KU), Japan.
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This study did not use human specimens. Immunization of mice was conducted following the institutional guideline for animal handling and experiments.
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The authors in the Department of Immunology at Kochi University have worked in funded collaboration with NEC Co., Ltd., to develop computational platforms for predicting HLA-binding peptides.
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Komatsu, T., Shimizu, T., Kanoh, M. et al. Development of a novel monoclonal antibody that binds to most HLA-A allomorphs in a conformation-dependent yet peptide-promiscuous fashion. Immunogenetics 72, 143–153 (2020). https://doi.org/10.1007/s00251-020-01154-w
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DOI: https://doi.org/10.1007/s00251-020-01154-w