[Objective] The aim of this study was to realize efficient expression of the porcine reproductive and respiratory syndrome virus （PRRSV） ORF7 gene in genetic engineering bacteria and analYze the immunological activi...[Objective] The aim of this study was to realize efficient expression of the porcine reproductive and respiratory syndrome virus （PRRSV） ORF7 gene in genetic engineering bacteria and analYze the immunological activity of the recombinant protein after purification. [ Method] The constructed recombinant expression vector pET-ORF7 was transformed into Escherichia co1BL21 （DE3） and induced by IPTG under the optimal condition. After analysis of SDS-PAGE and Western Blot, the expression products were purified by Ni-NTA His · Bind Resin chrom- atographic column under denaturing condition and renatured by gradient dialysis. Subsequently, the immunological activity of the renatured recombinant protein was detected by Westem Blot and indirect ELISA. [ Result] The recombinant plasmid pET-ORF7 expressed in E. coli successfully, and the fusion protein was in the form of inclusion body. By SDS-PAGE detection, the molecular weight of the expression protein was approximate 33 kD, according with the expectation. Analysis by Bandscan software showed that the expressed fusion protein was about 50% of total bacterial protein of BL21 （DE3）. Wastem Blot and indirect ELISA detection showed that the renatured protein could react with PRRSV positive serum specifically, indicating its good immunological activity. [ Conclusion] This study lays a foundation for the preparation of PRRSV monoclonal antibody and diagnostic kit.展开更多
本研究为建立一种针对猪繁殖与呼吸综合征病毒（PRRSV）的快速检测方法,根据PRRSV O RF7基因保守区域序列,设计了三对特异性引物。通过Bst D N A聚合酶、引物、Mg2＋、d NT Ps和SY BR G reenⅠ及H NB染料浓度等反应条件优化,建立了PRRS...本研究为建立一种针对猪繁殖与呼吸综合征病毒（PRRSV）的快速检测方法,根据PRRSV O RF7基因保守区域序列,设计了三对特异性引物。通过Bst D N A聚合酶、引物、Mg2＋、d NT Ps和SY BR G reenⅠ及H NB染料浓度等反应条件优化,建立了PRRSV反转录-环介导等温核酸扩增（RT-L AMP）检测方法 ,62℃条件下反应35 min,肉眼可见白色沉淀,1.5%琼脂糖凝胶电泳出现梯形条带,SYBR GreenⅠ染料显示呈绿色。该方法的最低检测限（TCID50）为1×10^0.5/m L,对猪瘟病毒、伪狂犬病病毒、猪圆环病毒2型和猪流行性腹泻病毒等病原均无交叉反应。110份临床样品检测结果显示,PRRSV阳性率60.0%,与RT-PCR检测结果符合率为85.5%。上述结果说明,该方法操作简便,灵敏特异,可用于PRRSV临床样品的快速诊断。展开更多
文摘[Objective] The aim of this study was to realize efficient expression of the porcine reproductive and respiratory syndrome virus （PRRSV） ORF7 gene in genetic engineering bacteria and analYze the immunological activity of the recombinant protein after purification. [ Method] The constructed recombinant expression vector pET-ORF7 was transformed into Escherichia co1BL21 （DE3） and induced by IPTG under the optimal condition. After analysis of SDS-PAGE and Western Blot, the expression products were purified by Ni-NTA His · Bind Resin chrom- atographic column under denaturing condition and renatured by gradient dialysis. Subsequently, the immunological activity of the renatured recombinant protein was detected by Westem Blot and indirect ELISA. [ Result] The recombinant plasmid pET-ORF7 expressed in E. coli successfully, and the fusion protein was in the form of inclusion body. By SDS-PAGE detection, the molecular weight of the expression protein was approximate 33 kD, according with the expectation. Analysis by Bandscan software showed that the expressed fusion protein was about 50% of total bacterial protein of BL21 （DE3）. Wastem Blot and indirect ELISA detection showed that the renatured protein could react with PRRSV positive serum specifically, indicating its good immunological activity. [ Conclusion] This study lays a foundation for the preparation of PRRSV monoclonal antibody and diagnostic kit.
文摘本研究为建立一种针对猪繁殖与呼吸综合征病毒（PRRSV）的快速检测方法,根据PRRSV O RF7基因保守区域序列,设计了三对特异性引物。通过Bst D N A聚合酶、引物、Mg2＋、d NT Ps和SY BR G reenⅠ及H NB染料浓度等反应条件优化,建立了PRRSV反转录-环介导等温核酸扩增（RT-L AMP）检测方法 ,62℃条件下反应35 min,肉眼可见白色沉淀,1.5%琼脂糖凝胶电泳出现梯形条带,SYBR GreenⅠ染料显示呈绿色。该方法的最低检测限（TCID50）为1×10^0.5/m L,对猪瘟病毒、伪狂犬病病毒、猪圆环病毒2型和猪流行性腹泻病毒等病原均无交叉反应。110份临床样品检测结果显示,PRRSV阳性率60.0%,与RT-PCR检测结果符合率为85.5%。上述结果说明,该方法操作简便,灵敏特异,可用于PRRSV临床样品的快速诊断。
