【摘要】 目的　用基因工程抗体技术构建抗日本血吸虫膜蛋白特异的单链抗体。　方法　用抗体框架区的通用引物 PCR扩增抗日本血吸虫膜蛋白特异性单克隆抗体 NP11- 4的 VH 及 VL 基因 ,测序分析其核苷酸序列。用VH 和 VL 基因在 p THA90质粒载体中构建成单链抗体基因并诱导表达。　结果　扩增获得 NP11- 4的 VH 和 VL基因 ,经测序分析确定为新发现的抗体可变区序列 ,构建成排列顺序为 VH- linker- VL 的单链抗体基因 ,经诱导表达出与硫氧环蛋白融合的单链抗体 ,大小约为 36 .2 k Da,以包涵体形式存在。　结论　成功地构建和表达了抗日本血吸虫膜蛋白特异性单链抗体。更多还原

【Abstract】 Objective To construct single chain antibody specific to membrane protein of Schistosoma japonicum by gonetic engineering technique. Methods The V\-H (heavy-chain variable region) and V\-L (light-chain variable region) genes were amplified by PCR from the genomic DNA of NP11-4 cell line, and sequenced by Sanger’s method. The ScFv was constructed in pTHA90 vector using V\-H and V\-L genes, then expressed by IPTG. Results The V\-H and V\-L genes were obtained through PCR. The DNA sequences showed that V\-H and V\-L were new variable region genes of antibody. They were registered by GenBank. A ScFv gene with (Gly4Ser) 3 intralinker in the pTHA90 vector was successfully constructed. The ScFv was expressed as thioredoxin-fused proteins about 36\^2 kDa. Conclusion A specific ScFv against the membrane protein of Schistosoma japonicum was constructed and expressed.更多还原