为了获得重组Fcε3-4蛋白,从变态反应性哮喘大鼠脾组织中提取总RNA,通过RT-PCR方法克隆大鼠Fcε3-4基因,构建成原核表达载体pET17b-Fcε3-4,并转化大肠杆菌进行诱导表达,Fcε3-4蛋白主要以包涵体形式存在.经Ni-NAT亲和层析柱对尿素溶解的Fcε3-4蛋白进行了纯化,并利用降低尿素梯度的方法柱上对纯化蛋白进行了复性.经Western Blotting和ELISA鉴定,Fcε3-4蛋白具有Fcε的免疫特异性,能被抗大鼠Fcε抗体特异性识别,为下一步研究该蛋白奠定了基础.
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