牛环形泰勒虫裂殖子/梨浆虫表面抗原基因非疏水区的克隆及GST-P27重组蛋白的高效表达

Clone of Tams1 Gene Non-hydrophobic Region of Theileria annulata and High Level Expression of Recombinant Protein GST-P27

试验据GenBank登载的牛环形泰勒虫裂殖子/梨浆虫表面抗原(the merozoite/piroplasm surface antigen,Tams1)基因序列(登录号:AF214842),设计1对特异性引物,经PCR扩增出696bp的Tams1基因片段,将其插入pGEX-4T-2表达载体,提取质粒进行双酶切鉴定并测序,同源性达98%;将插入阳性质粒的BL21(DE3)菌种诱导表达重组蛋白,经优化后在37℃、0.5mmol/L IPTG诱导4h的表达条件下获得了表达量达1.39mg/mL的可溶性融合蛋白,大小为53ku;表达产物在Glutathione Sepharose 4B柱上纯化后,免疫印迹检测结果表明重组蛋白GST-P27具有良好的反应原性。

A fragment about 696 bp was amplified by PCR technique with specific primers based on Tams1 gene sequence （AF214842） of Theileria annulata reported in GenBank. Then the target fragment was directionally cloned into pGEX-4T 2 expression vector, the recombinant plasmid DNA was cut by enzymes, and then sequenced. The result showed that the homolo- gy of the cloned Tamsl gene was 98%. The positive plasmid was transformed into BL21（DE3）, and then induced by IPTG. Soluble fusion protein whose expression level reached 1.39 mg/mL was obtained when it was induced with 0.5 mmol/L IPTG for 4 h at 37 ℃, and it was 53 ku. Western blotting showed that recombinant protein GST P27 which was purified by Glutathi- one Sepharose 4B had the favorable reactionogenicity.