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Characterization of the recognition specificity of BH2, a monoclonal antibody prepared against the HLA-B27 heavy chain.

International journal of molecular sciences (2015-04-15)
Hui-Chun Yu, Kuang-Yung Huang, Ming-Chi Lu, Hsien-Lu Huang, Wei-Ting Liu, Wen-Chien Lee, Su-Qin Liu, Hsien-Bin Huang, Ning-Sheng Lai
ABSTRACT

BH2, a monoclonal antibody prepared against the denatured human leukocytic antigen-B27 heavy chain (HLA-B27 HC), can immunoprecipitate the misfolded HLA-B27 HC complexed with Bip in the endoplasmic reticulum and recognize the homodimerized HLA-B27 HC that is often observed on the cell membrane of patients suffered from ankylosing spondylitis (AS). However, the recognition specificity of BH2 toward the other molecules of HLA-B type and toward the different types of HLA molecules remained uncharacterized. In this study, we carried out the HLA-typing by using the Luminex Technology to characterize the recognition specificity of BH2 and analyzed the binding domain of HLA-B27 HC by BH2. Our results indicated that BH2 preferably binds to molecules of HLA-B and -C rather than HLA-A and the binding site is located within the α2 domain of HLA-B27 HC.

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