【摘要】 目的获得IgE Fc段的Cε3-Cε4重组蛋白(E34)。方法以RT-PCR技术扩增IgE Cε3-Cε4(E34)cDNA片段,构建原核表达载体。以其转化大肠杆菌BL-21,诱导表达主要以包涵体形式存在的目的蛋白。经复性、纯化后,用Wes-tern blot和ELISA法初步鉴定所获E34蛋白与抗人IgE mAb的结合能力。结果对克隆的E34基因片段测序表明,与已报道的序列相一致。获得的可溶性E34蛋白经SDS-PAGE鉴定显示,其相对分子质量(Mr)同预期的结果相一致。Westernblot和ELISA法进一步证实,E34蛋白能够被鼠抗IgE mAb特异性识别。结论成功地构建了pET28a(+)-E34表达载体,并获得能被抗IgE mAb特异性识别的可溶性蛋白E34,为下一步的工作打下了基础。更多还原

【Abstract】 AIM: To gain recombinant protein Cε3-Cε4 of IgE Fc (E34). METHODS: We cloned the gene coding human IgE Cε3-Cε4 (E34) and constructed an expression vector pET28a(+)-E34. The target protein was expressed as inclusion body in E.coli BL-21. Following renaturation and purification through a CM sephorose FF column, the soluble protein was acquired, and its binding ability to murine anti-hIgE mAb was identified by Western blot and ELISA. RESULTS: The cloned E34 gene was sequenced and proved by SDS-PAGE to be the same as reported sequence. SDS-PAGE analysis showed the relative molecular mass of E34 protein obtained was correct as predicted. Western blot and ELISA data revealed that it owned the epitope of binding to murine anti-hIgE mAb. CONCLUSION: The expression vector pET28a(+)-E34 has been successfully constructed and the target protein E34 recognized specifically by murine anti-hIgE mAb is obtained.[更多还原