Objective: To study the biological activity of Myco-plasma penetrans 35kDa lipoprotein(P35) in vitro, prokaryotic expression vector pQE31//p35 was constructed and recombinant fusion protein P35 (rP35) was expressed in...Objective: To study the biological activity of Myco-plasma penetrans 35kDa lipoprotein(P35) in vitro, prokaryotic expression vector pQE31//p35 was constructed and recombinant fusion protein P35 (rP35) was expressed in E.coli. Methods: The p35 gene was amplified by polymerase chain reaction(PCR), cloned to pQE31, and a positive clone was screened. PCR-mediated mutagenesis was used to change the two "TGA" triplets to "TGG" triplets within the p35 gene. Production of the recombinant protein was induced by the addition of IPTG to the E.coli culture. rP35 was purified with a Ni-NTA Spin Kit and rP35 purification was analyzed by Western blot. Results: About 1Kb PCR amplification was cloned into pQE31. The two "TGA" triplets within the p35 gene were successfully changed to "TGG" triplets. The pQE31/p35 vector expressed a protein with a calculated molecular mass of 37.4kDa in E.coli. Western blot indicated the 37.4kDa protein was rP35 . Conclusion: PQE31/p35, a prokaryotic expression vector containing p35 gene, was successfully constructed and expressed in E.coli.展开更多
文摘利用PCR方法获得PRRSV M基因,使用原核表达系统p ET-28a(+)-BL21(DE3)诱导表达M蛋白。用表达的M蛋白建立检测PRRSV抗体的间接ELISA。通过特异性试验、阻断试验和重复性试验考查基于重组M蛋白建立的ELISA(M-ELISA)的实用性,同时使用M-ELISA和IDEXX Herd Chek ELISA for PRRSV试剂盒检测收集的400份临床血清样品。结果,用PCR扩增到了PRRSV M基因,获得了重组M蛋白,建立了用于检测PRRSV抗体的间接ELISA(M-ELISA);该M-ELISA具有良好的特异性和重复性。400份临床血清的检测结果与IDEXX试剂盒的检测结果的符合率为95.3%。上述结果表明,本研究基于表达的重组M蛋白,成功建立了检测RRSV抗体的间接ELISA。
基金Supported by the Nature Science Fund of Hunan Province(02JJY2025) Health Office of Hunun Province(Y02-066).
文摘Objective: To study the biological activity of Myco-plasma penetrans 35kDa lipoprotein(P35) in vitro, prokaryotic expression vector pQE31//p35 was constructed and recombinant fusion protein P35 (rP35) was expressed in E.coli. Methods: The p35 gene was amplified by polymerase chain reaction(PCR), cloned to pQE31, and a positive clone was screened. PCR-mediated mutagenesis was used to change the two "TGA" triplets to "TGG" triplets within the p35 gene. Production of the recombinant protein was induced by the addition of IPTG to the E.coli culture. rP35 was purified with a Ni-NTA Spin Kit and rP35 purification was analyzed by Western blot. Results: About 1Kb PCR amplification was cloned into pQE31. The two "TGA" triplets within the p35 gene were successfully changed to "TGG" triplets. The pQE31/p35 vector expressed a protein with a calculated molecular mass of 37.4kDa in E.coli. Western blot indicated the 37.4kDa protein was rP35 . Conclusion: PQE31/p35, a prokaryotic expression vector containing p35 gene, was successfully constructed and expressed in E.coli.