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KMID : 0578319970070020237
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Molecules and Cells
1997 Volume.7 No. 2 p.237 ~ p.243
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Reassembly and Reconstitution of Separate α and β Chains of Human Leukocyte antigen DR4 molecule isolated from Escherichia coli
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Kang, Joo Hyun
Maeng, cheol-young/Park, Jung-Hyun/Hahm, Kyung-Soo/Han, Byoung-don/Kim, Kil Lyong
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Abstract
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The class Ⅱ major histocompatibility complex molecules play a major role in presentation of exogenous antigenic peptides to the CD4 positive helper T cell. These are heterodimeric cell surface glycoproteins consisting of α- and β-chains. In the present study, we cloned and expressed the α- and β-chain of HLA-DR4 lacking the transmembrane and cytoplasmic domain separately in Escherichia coli using the pET-5a expression vector system. The expressed α- and β-chains were purified in a denaturing condition by an ion exchange chromatography on Q-Sepharose and a gel filtration chromatography on Sephacryl S-200, respectively. The recombinant proteins were refolded and reassembled by removing the denaturing agent and concomitant reoxidation of the disulfide bond. The refolded heterodimeric rDR4 molecule was resolved by 12.5% SDS-PAGE in a nonreducing condition and confirmed by Western blot using polyclonal antibody against DR-α and the monoclonal antibody (L243) for the conformationally correct DR molecule. The rDR4 molecules were reconstituted with a 50-fold molar excess biot-HA (307-319), and the bound peptides to the heterodimer complex were determined by a microplate assay coated with L243 antibody using Extravidin-HRP conjugate.
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