整合猪繁殖与呼吸综合征病毒GP5蛋白的重组鼠白血病病毒特性  

Characterization of Murine Leukemia Virus Recombinants Bearing prrsv GP5 Glycoproteins

作　　者：党占国[1] 夏平安[1] 周斌[2] 尹彦涛[1] 王建举[1] 柴春霞[1] 崔保安[1] 陈溥言[2] 

机构地区：[1]河南农业大学牧医工程学院微生物实验室,郑州450002 [2]南京农业大学农业部动物疫病诊断与免疫重点开放实验室,南京210095

出　　处：《生物工程学报》2008年第5期780-785,共6页Chinese Journal of Biotechnology

基　　金：中国博士后基金项目(No.20060390944)资助~~

摘　　要：通过反转录-聚合酶链式反应(RT-PCR)扩增了猪繁殖与呼吸综合征病毒完整的GP5基因并进行了克隆与鉴定。序列测定结果与已经登陆GenBank的EF488048高致病性江西株比对分析表明碱基同源性达98.7%。构建含GP5基因的真核表达载体pcDNA-GP5,通过与鼠白血病病毒(MuLV)假病毒构建体系的两种质粒pHIT60和pHIT111共转染人胚肾细胞293T,48h后收集假病毒上清,超离后通过Western-blot证明GP5蛋白在假型病毒颗粒表面存在,表明GP5蛋白被整合到此假型病毒粒子表面。通过感染293T、Mark-145不同的靶细胞,证实所构建的假型病毒粒子具有感染性。成功构建了具有感染性的MuLV-GP5假病毒体系,为研究猪繁殖与呼吸综合征病毒侵入细胞的机理及其组织嗜性的变异提供一种新方法。The highly virulent PRRSV isolate strain HN-1/06 was cultivated on Marc-145. To study the viral entry mechanisms, the GP5 gene of PRRSV isolate was amplified by RT-PCR and cloned into pcDNA3.0 to generate the expressing plasmid pcDNA-GP5. pcDNA-GP5 was transfected into 293T by the calcium phosphate precipitation method. Analysis of flow cytometry confirmed that the GP5 proteins were expressed in surface of the 293T cells. Then 293T cells were transfected with pcDNA-GP5, pH1T60 and pH1TI 11 plasmids to generate pseudotyping virus. The pseudotyping virus supematant was harvested 48 hours post-transfection and was detected by Western blotting and infection assay. Western blotting indicated that the GP5 glycoproteins were incorporated into the retrovirai pseudotyped virus. Infection assay showed that the pseudotyped virus infected 293T and Mark-145 cell. The pseudotyped virus could be used to further study infectious mechanism of PRRSV.

关 键 词：鼠白血病病毒 猪繁殖与呼吸综合征病毒 GP5基因 假病毒 

分 类 号：S852.65[农业科学—基础兽医学] S852.659.6[农业科学—兽医学]