摘要
根据日本血吸虫菲律宾株编码 2 1 7kD蛋白的基因设计引物 ,以日本血吸虫中国大陆株成虫mRNA为模板 ,用RT PCR法扩增出大小为 5 5 8bp的基因片段。经序列分析推断该基因片段为编码日本血吸虫中国大陆株2 1 7kD蛋白基因的完整阅读框 ,与菲律宾株该基因的碱基序列同源性为 98%。将其克隆到表达载体pET2 8a(+)中 ,在大肠杆菌BL2 1中获得表达 ,融合表达产物分子量约为 2 5 4kD。利用日本血吸虫成虫抗原免疫血清对该表达产物进行Western印迹检测 ,在预测位置出现了明显的识别条带 。
A 558 bp cDNA fragment was amplified by RT-PCR from adult Schistosoma japonicum(Chinese strain) mRNA with a pair of primers that were designed according to published Sj21.7p gene encoding 21.7 kD protein of Schistosoma japonicum(Philippines strain). Sequence analysis indicated that this frame, named Sj21.7(Ch), with 99% homology to Sj21.7p, contained a complete open reading fragment (ORF) of 21.7 kD protein gene of Schistosoma japonicum(Chinese strain). The amino acid sequence shared 98% homology with 21.7 kD protein of Schistosoma japonicum. This fragment was cloned into the expression vector pET28a (+) and subsequently expressed in Escherichia coli with IPTG induction. SDS-PAGE analysis revealed that the molecular weight of this expressed product was 25.4 kD.Western blotting showed that the recombinant protein reacted well with the rabbit serum immunized with Sj worm antigen,indicating that this expressed product had good antigenicity.
出处
《生物工程学报》
CAS
CSCD
北大核心
2002年第6期698-702,共5页
Chinese Journal of Biotechnology
基金
科技部科研院所社会公益研究专项基金 (No .2 0 0 0 181)
国家自然科学基金 (No .39870 5 48
No.30 0 10 0 138)~~
