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正猪繁殖与呼吸综合征病毒(Porcine reproductive and respiratory syndrome virus,PRRSV)是引起猪繁殖与呼吸综合征(PRRS)的病原,该病毒分为两个基因型,即以LV为代表的欧洲型(基因I型)和以VR2332为代表的美洲型(基因II型)。PRRSV全长约15 kb,包含编码非结构蛋白的ORF1a和ORF1b、编码次要结构蛋白的ORF2-4、编码主要结构蛋白的ORF5-7以及两端非翻译区5'UTR和3'UTR。PRRSV是一种有囊膜的病毒,具有比较严格的细胞嗜性。而特异性的受体可能与细胞嗜性密切相 相似文献
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猪繁殖与呼吸综合征病毒（Porcine Reproductiveand Respiratory Syndrone Virus，PRRSV）结构蛋白分别由ORF2～7编码，这六个ORF呈部分重叠式结构，分别编码相应的结构蛋白：Gp2、Gp3、Gp4、Gp5、M（膜基质蛋白）、N（核衣壳蛋白），其中N、M、Gp5为主要结构蛋白。 相似文献
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猪繁殖与呼吸综合征病毒蛋白质研究进展 总被引：2，自引：1，他引：1
猪繁殖与呼吸综合征病毒(PRRSV)是一种折叠的正义RNA病毒,属于动脉炎病毒科(Arteriviridae),尼多病毒目(Nidovirales)。除了动脉炎病毒科,尼多病毒目还包括冠状病毒科(Coronaviruses)。15.1~15.2 kb长的PRRSV基因组通过互相重叠的开放性阅读框编码蛋白质。ORF1a翻译过程中产生pp1a多聚蛋白。ORF1b表达产生了 pp1ab多聚蛋白。pp1a和pp1ab经病毒蛋白酶处理后又生成了14个非结构蛋白。一些非结构蛋白为蛋白酶(NSP1、NSP1β、NSP2和NSP4)、RNA-依赖性RNA聚合酶(NSP9)、解旋酶(NSP10)和核酸内切酶(NSP11)。ORFs2-5编码GP2-GP5,ORF6编码M,ORF7编码N蛋白。ORF2b完全包括在ORF2内,表达小的非糖基化E或2b蛋白。相当一部分的囊膜蛋白是nidoviruses所特有的,所有的结构蛋白都是感染所必需的。 相似文献
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反向遗传学在猪繁殖与呼吸综合征病毒研究中的应用 总被引：1，自引：0，他引：1
<正>反向遗传学遵循"中心法则",在获得生物体基因组全部序列的基础上,通过对靶基因进行必要的加工和修饰,再按组成顺序构建含生物体必需元件的修饰基因组,让其装配出具有生命活性的个体([1])。猪繁殖与呼吸综合征病毒(PRRSV)为单股正链RNA病毒,基因组约为15 kb,有8个开放阅读框架(ORF),ORF1位于基因组的5′末端,编码病毒非结构蛋白,ORF2([1])。猪繁殖与呼吸综合征病毒(PRRSV)为单股正链RNA病毒,基因组约为15 kb,有8个开放阅读框架(ORF),ORF1位于基因组的5′末端,编码病毒非结构蛋白,ORF27位于基因组的3′ 相似文献
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猪繁殖与呼吸综合征,是由猪繁殖与呼吸综合征病毒（Porcine reproductive and respiratory syndrome virus,PRRSV）引起的以母猪繁殖障碍和仔猪呼吸道症状为主的一种严重的病毒性疾病。PRRSV属于尼多目动脉炎病毒科动脉炎病毒属,是含有囊膜的单股正链RNA病毒。PRRSV基因组长约15kb,含9个开放阅读框（ORF）,其中0RF2-7编码病毒的结构蛋白。 相似文献
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猪繁殖与呼吸综合征（PRRS）是以母猪生殖障碍和仔猪严重呼吸困难导致的高死亡率为特征的一种高度接触性传染病。本病于1987年首次在美国发现,又称“蓝耳病”,流行于世界许多国家和地区,对养猪业构成巨大威胁。PRRSV基因组为单股正链RNA,大小为15kb左右。含8个开放阅读框（ORF）,其中ORF1占基因组的80％,编码病毒RNA复制酶;ORF2～7编码病毒结构蛋白：其中ORF2～4编码病毒囊膜糖蛋白,ORF5编码E蛋白,又称GP5,为糖蛋白,分子质量22．4ku左右,该蛋白含有一段很大的内部疏水区,起锚定膜的作用,ORF6编码M蛋白, 相似文献
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猪繁殖与呼吸综合征(PRRS)是目前世界上对养猪业带来重大经济损失的一种传染性疾病,PRRSV是该病病原,一种具有包膜的单股正链RNA病毒,0RF1a,ORF1b编码该病毒非结构蛋白(Nsps)其编码的ORF1a,ORF1 ab两个具有病毒的复制酶和RNA聚合酶功能的多聚蛋白pp1a和pp1b在蛋白水解酶裂解作用下产生至少12个推测的非结构蛋白Nsp1～Nsp12[1].Nsp2作为PRRSV最大的非结构蛋白,具有高变异特性及多种生物学特性且应用广泛,在病毒研究中,Nsp2一直是研究热点,本文就PRRSV的非结构蛋白Nsp2分子生物学特性、免疫学功能及其应用做一简要综述. 相似文献
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PRRSV, the virus 总被引：25，自引：0，他引：25
Meulenberg JJ 《Veterinary research》2000,31(1):11-21
Porcine reproductive and respiratory syndrome virus (PRRSV) is a positive-strand RNA virus that belongs to the Arteriviridae family. PRRSV grows in primary alveolar macrophages and in monkey kidney cell lines. The genomic RNA is approximately 15 kb. The genome encodes the RNA replicase (ORF1a and ORF1b), the glycoproteins GP2 to GP5, the integral membrane protein M, and the nucleocapsid protein N (ORFs 2 to 7). A comparison of nucleotide sequences of different strains indicates that European and North American strains represent two distinct antigenic types. Various PRRSV-specific monoclonal antibodies and recombinant structural proteins have been produced. Well-defined PRRSV mutants can be generated with the recently developed infectious cDNA clone of PRRSV. 相似文献
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以重庆分离病毒株PRRSV-SCQ构建的包含SCQ株ORF2、ORF3、ORF4、ORF5、ORF6和ORF7 6个结构蛋白基因的cDNA文库质粒pRSF2、pRSF3、pRSF4、pRSF5、pRSF6和pRSF7为基础材料,通过Sanger′s双脱氧末端终止法进行核酸序列分析。测序结果表明,文库质粒DNA中分别含有PRRSV-SCQ株中为结构蛋白编码的阅读框ORF2、ORF3、ORF4、ORF5、ORF6和ORF7的完全序列,其起始密码子均为ATG,终止密码子分别为TGA、TAG、TGA、TAG、TAA和TGA。阅读框ORF2的cDNA片段长度为721 bp,ORF3的cDNA片段长度为764 bp,ORF4的cDNA片段长度为547 bp,ORF5的cDNA片段长度为621 bp,ORF6的cDNA片段长度为509 bp,ORF7的cDNA片段长度为436 bp。推导的蛋白质序列中,GP2、GP3、GP4、GP5、M和N蛋白的氨基酸数量分别为258,254,178,200,174 aa和123aa。每条多肽链都以甲硫氨酸为起始氨基酸。 相似文献
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Zhou F Liang S Chen AH Singh CO Bhaskar R Niu YS Miao YG 《Veterinary research communications》2012,36(2):99-105
Porcine reproductive and respiratory syndrome (PRRS) is now considered to be one of the most important diseases in countries with intensive swine industries. The two major membrane-associated proteins of porcine reproductive and respiratory syndrome virus (PRRSV), GP5 and M (encoded by ORF5 and ORF6 genes, respectively), are associated as disulfide-linked heterodimers (GP5/M) in the virus particle. In this study, we designed 5 of the small hairpin RNAs (shRNAs) targeting the GP5 and M gene of PRRSV respectively, and investigated their inhibition to the production of PRRSV. The highest activity displayed in shRNAs of the ORF6e sequence (nts 261-279), which the inhibition rate reached was 99.09%. The result suggests that RNAi technology might serve as a potential molecular strategy for PRRSV therapy. Furthermore, the transgenic Marc-145 cell line of piggyBac transposon-derived targeting shRNA interference against PRRS virus was established. It presented stable inhibition to the replication and amplification of PRRS. The work implied that shRNAs targeting the GP5 and M gene of PRRSV may be used as potential RNA vaccines in vivo, and supplied the screening methods of transformed pig embryonic fibroblast which are prerequisite for the disease-resistant transgenic pigs to PRRS. 相似文献
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猪生殖——呼吸综合征病毒蛋白的结构与功能 总被引：2，自引：0，他引：2
猪生殖－－呼吸道综合征（ＰＲＲＳ）病毒是新发现的ＲＮＡ病毒，其基因组有８个开放阅读框架（ＯＲＦ），ＯＲＦ１编码病毒的ＲＮＡ聚合酶，ＯＲＦ２－７分别编码糖蛋白ＧＰ２－５、Ｍ蛋白和Ｎ蛋白。本文概括了近几年来国际上对其病毒蛋白的研究成果，对这些病毒蛋白的结构，功能及其免疫学地位进行了分析和讨论。 相似文献
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Genetic and immunobiological diversities of porcine reproductive and respiratory syndrome genotype I strains 总被引：1，自引：0，他引：1
Darwich L Gimeno M Sibila M Diaz I de la Torre E Dotti S Kuzemtseva L Martin M Pujols J Mateu E 《Veterinary microbiology》2011,150(1-2):49-62
Genetic diversity of porcine reproductive and respiratory syndrome virus (PRRSV) has been based on ORF5/GP5 and ORF7/N protein variations. Complete viral genome studies are limited and focused on a single or a few set of strains. Moreover, there is a general tendency to extrapolate results obtained from a single isolate to the overall PRRSV population. In the present study, six genotype-I isolates of PRRSV were sequenced from ORF1a to ORF7. Phylogenetic comparisons and the variability degree of known linear B-epitopes were done considering other available full-length genotype-I sequences. Cytokine induction of all strains was also evaluated in different cellular systems. Non structural protein 2 (nsp2) was the most variable part of the virus with 2 out of 6 strains harboring a 74 aa deletion. Deletions were also found in ORF3 and ORF4. Phylogenetic analyses showed that isolates could be grouped differently depending on the ORF examined and the highest similarity with the full genome cluster was found for the nsp9. Interestingly, most of predicted linear B-epitopes in the literature, particularly in nsp2 and GP4 regions, were found deleted or varied in some of our isolates. Moreover, 4 strains, those with deletions in nsp2, induced TNF-α and 3 induced IL-10. These results underline the high genetic diversity of PRRSV mainly in nsp1, nsp2 and ORFs 3 and 4. This variability also affects most of the known linear B-epitopes of the virus. Accordingly, different PRRSV strains might have substantially different immunobiological properties. These data can contribute to the understanding of PRRSV complexity. 相似文献
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The porcine reproductive and respiratory syndrome virus (PRRSV) GP4 and GP5 proteins are two membrane-associated viral glycoproteins that have been shown to induce neutralizing antibodies. In the present study, the host cell gene expression profiles altered by the GP4 and GP5 proteins were investigated by the use of DNA microarrays. Sublines of Marc-145 and HeLa cells were established by stable transfection with open reading frame (ORF)4 and ORF5 of PRRSV, respectively, and differential gene expressions were studied using microarray chips embedded with 1718 human-expressed sequence tags. The genes for protein degradation, protein synthesis and transport, and various other biochemical pathways were identified. No genes involved in the apoptosis pathway appeared to be regulated in GP5-expressing cells. The microarray data may provide insights into the specific cellular responses to the GP4 and GP5 proteins during PRRSV infection. 相似文献