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    Expression and activity identification of extracellular region of Human CD4 and Human or Mice MHC classⅡ molecule

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    CD4分子在机体免疫系统中起重要作用,它与MHCⅡ、TCR相互作用,形成CD4-MHCⅡ-TCR复合物,介导特异性抗原呈递以及激活CD4+T细胞,引发机体特异性的免疫应答。同时,CD4是HIV感染的宿主细胞上主要受体,CD4融合蛋白的药物及CD4的抗体在艾滋病的临床研究中显示了良好的治疗效果。 本研究尝试通过真核及原核表达系统对人CD4蛋白胞外段进行表达。真核表达中,应用CHO细胞和293FT细胞分别表达CD4蛋白胞外段,仅含有信号肽的序列有小量表达。原核表达中,应用大肠杆菌BL21菌表达的人CD4胞外段不同域以包涵体的形式存在,经尿素变性及复性,再经分子筛纯化之后,其纯度能够达到90%以上...In the body's immune system, CD4 molecule plays an important role, which mediates specific antigen presentation and initiates specific immune responses by forming trimolecular complexes CD4-MHCⅡ-TCR. Meanwhile, cell surface CD4 molecule is the HIV infected host cell's main receptor, and good therapeutic results have been demonstrated by the use of medicine fusing CD4 and some anti-CD4 antibodies i...学位:理学硕士院系专业:生命科学学院生物学系_细胞生物学学号:2172008115257
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