Objective To improve the prokaryotic expressions of the GP5 gene of European-type PRRSV with different vectors. Methods In accordance with the genome sequences of European-type PRRSV LV strain in GenBank,two pair of primers were designed to amplify the ORF5sequence of PRRSV.The amplified GP5 and gGP5 genes were cloned and 8 recombinant plasmids were respectively constructed:pET-28a-GP5,pET-28a-gGP5,pET-22b-GP5,pET-22b-gGP5,pET-32a-GP5,pET-32a-gGP5,pGEX-4T-GP5,and pGEX-4T-gGP5. Results After induction with 1...
猪繁殖与呼吸综合征(porcine reproductive and re-spiratory syndrome,PRRS)是由猪繁殖与呼吸综合征病毒(PRRSV)引起的一种高度传染病。本病以母猪的繁殖障碍和仔猪的呼吸道症状及高死亡率为特征[1,2]。该病于1987年在美国首次报道[3],之后迅速传播,已经遍及世界主要养猪国家,