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1.
试验旨在比较分析羊口疮病毒(orf virus,ORFV)VIL-10基因在疫苗株和野毒株之间的差异特征。参照GenBank中公布的ORFV NZ2株的VIL-10基因序列设计并合成1对特异性引物,分别以疫苗株和野毒株提取的基因组DNA为模板,采用PCR方法扩增ORFV的VIL-10基因全序列并进行测序,应用生物信息学相关软件分析基因的核苷酸、氨基酸变异情况及蛋白结构。结果显示,本试验测定的疫苗株和野毒株VIL-10基因核苷酸序列同源性为94.4%,差异主要是单个碱基的突变,其中疫苗株在132~134 bp核苷酸序列出现缺失;氨基酸序列同源性为92.5%,出现了15个氨基酸位点的突变,其中疫苗株第42位氨基酸天冬酰胺出现缺失;蛋白质在一级结构及理化性质、二级结构、三级结构、抗原表位参数及有无信号肽之间均存在一定程度的差异,而疫苗株和野毒株编码的蛋白质均无跨膜结构域。系统进化树分析结果表明,本试验测定的野毒株与疫苗株属于不同分支,遗传关系较远。研究结果提示,野毒株与疫苗株的VIL-10基因发生较明显的变异,这些变异可能与ORFV疫苗株的毒力致弱有关。  相似文献   
2.
This study was aimed to clone and express ORFV086 protein of Orf virus (ORFV) in prokaryocytes and prepare polyclonal antibody anti-ORFV086 which was used to detect the expression of ORFV086 protein. The ORFV086 gene was amplified from genome DNA isolated from ORFV by PCR, then cloned into prokaryotic expression vector pET-33b (+) to construct a recombinant expression vector pET33b-086. The pET33b-086 was transformed into E.coli BL21 (DE3) pLys and induced by IPTG from which the fusion protein was identified by SDS-PAGE. The purified protein was injected into New Zealand rabbits and the polyclonal antibody was prepared, which was identified by the indirect ELISA and Western blotting methods. The results showed that the recombinant protein mainly existed in the inclusion body with the expected molecular weight of about 100 ku. After purified by cutting the gel slices, target protein was used as immunogen to prepare polyclonal antibody. The titer of the polyclonal antibody was 1:128000. Western blotting method revealed that the purified polyclonal antibody had a specific affinity for the reorganizational and natural ORFV086 protein. Thus, the rabbit anti-ORFV086 polyclonal antibody was successfully prepared, providing a tool for further investigation on the role of ORFV086 protein infection.  相似文献   
3.
The purpose of this study was to investigate the variation of Orf virus (ORFV) immune related genes after infection with different species.The ORFV genomes of sheep and camel were extracted and named ORFV-Y and ORFV-LT,respectively.Based on ORFV genome sequence published in GenBank (accession No.:KF234407.1),three pairs of specific primers were designed and synthesized to amplify the B2L,F1L and VIR gene fragments of ORFV-Y and ORFV-LT,respectively,and the amplified fragments were cloned into pMD19-T vector,transformed into E.coli DH5α competent cells.The recombinant plasmid was identified,and positive clones were selected for sequencing,DNAStar software was used to analyze the homology,amino acid sequence and phylogenetic tree of 13 ORFV genome sequences published on NCBI.The results showed that the nucleotide homology of B2L,F1L and VIR genes were 92.8% to 99.2%,95.7% to 99.5% and 77.6% to 100%,respectively.After comparing the amino acid sequence between the two genomes and the reference sequence,it was found that there were obvious differences in the immune related genes between the two genomes,and F1L gene had some rules to follow.The phylogenetic analysis of B2L,F1L and VIR genes showed that ORFV-Y was closely related to the Chinese Fujian goat strain,while ORFV-LT was far from the reference strains,and was a separate branch.The results showed that ORFV had obvious difference in immune related genes between sheep and camels,it provided a reference basis for further research on the changes of ORFV gene sequences in different species and the development of vaccines for different species in the future.  相似文献   
4.
试验旨在探究羊口疮病毒(Orf virus,ORFV)在感染不同物种后其免疫相关基因所表现出的差异变化。对采集到的羊和骆驼ORFV病料进行病毒基因组提取,分别命名为ORFV-Y和ORFV-LT。根据GenBank中ORFV全基因组序列(登录号:KF234407.1)设计并合成3对特异性引物,分别扩增ORFV-Y和ORFV-LT的B2LF1LVIR基因片段,并将扩增得到的基因片段分别克隆到pMD19-T载体上,转化大肠杆菌DH5α感受态细胞,对重组质粒进行鉴定,选取阳性克隆质粒进行测序,用DNAStar软件对所获序列进行拼接后,与NCBI上已公布的13组ORFV全基因组相应基因序列进行同源性比对、氨基酸序列分析和系统进化树构建。结果显示,两组基因组与参考序列的B2LF1LVIR基因核苷酸同源性分别为92.8%~99.2%、95.7%~99.5%和77.6%~100%。将两组基因组与参考序列进行氨基酸序列比对分析后发现,两组基因组之间的免疫相关基因均表现出较为明显的差异,且F1L基因有一定的规律可循。对B2LF1LVIR基因进行系统进化树构建分析后发现,ORFV-Y与中国福建山羊株亲缘关系较近,而ORFV-LT与参考毒株进化关系均较远,且单独成为一个分支。综上,ORFV在感染羊和骆驼时其免疫相关基因出现了较为明显的差异,为深入探究ORFV感染不同物种其基因序列发生的变化及未来针对不同物种的疫苗研制提供参考。  相似文献   
5.
【目的】从榆林市具有典型羊口疮症状的陕北白绒山羊唇结痂病料中分离羊口疮病毒(Orf virus,ORFV),克隆分析其B2L基因序列,并通过昆虫杆状病毒表达B2L基因。【方法】利用牛肾传代细胞进行ORFV的分离培养,通过PCR的方法从分离到的病毒中扩增出B2L全长基因,测序后进行序列及遗传进化分析。利用扩增所得的B2L基因构建昆虫杆状病毒表达载体,包装出杆状病毒后侵染sf9细胞,并通过SDS-PAGE、Western-blot以及质谱鉴定等方法验证目的基因的表达情况。【结果】成功分离出1株羊口疮病毒,命名为ORFV-Yulin株;扩增的B2L全长基因长度为1 137bp,与Hub13和GY-AHF10株亲缘关系最近,核苷酸序列和氨基酸序列的相似性分别为99%和99.2%。通过昆虫杆状病毒表达系统成功表达了B2L基因,获得了47ku的重组蛋白。【结论】从榆林市陕北白绒山羊中获得了羊口疮病毒分离株(ORFV-Yulin);通过昆虫杆状病毒表达系统成功表达了ORFV-Yulin株的B2L基因。  相似文献   
6.
羊口疮病毒贵州株F1L基因克隆及生物信息学分析   总被引:1,自引:1,他引:0  
为分析羊口疮病毒贵州株(ORFV-GZ株)F1L基因的分子特点,预测编码蛋白的生物学功能,本试验对ORFV-GZ株F1L基因进行PCR扩增、克隆及序列测定。应用生物信息学相关软件及方法,对ORFV-GZ株F1L基因进行列分析并对其编码蛋白进行了二级结构、B细胞表位、保守结构域、跨膜结构域和信号肽预测。结果显示,F1L基因PCR扩增产物大小为1 029bp,编码342个氨基酸;与OV-SA00株、NZ2株、OV-IA82株和D1701株相应序列核苷酸同源性分别为98.4%、97.9%、97.8%和96.8%,氨基酸的同源性分别为98.3%、97.6%、97.3%和95.3%;系统进化树显示,ORFV-GZ株F1L基因与FJ-GT株亲缘关系最近;二级结构以α-螺旋和无规则卷曲所占比例较大,预测此蛋白可能存在7个B细胞优势抗原表位,两个跨膜区域,无信号肽区域。本试验结果将为贵州省ORFV免疫诊断及核酸疫苗研究提供理论依据。  相似文献   
7.
根据GenBank中的羊传染性脓疱病毒(ORFV)B2L基因序列,设计合成1对引物,通过对PCR条件的优化,敏感性、特异性试验,成功建立了ORFV的PCR检测方法。敏感性与特异性结果显示,最低核酸检测量为1.2 fg/μL,对口蹄疫病毒、山羊痘病毒、丝状支原体山羊亚种的扩增结果均为阴性。同时根据GenBank中的ORFV的CBP基因的序列,设计合成1对特异性引物,以ORFV贵州分离株作为模板,成功克隆出ORFV的CBP基因。同源性分析表明,核苷酸与GenBank中ORFV的CBP基因的核苷酸序列相似性99.4%~88.8%。本研究为ORFV感染的流行病学调查和CBP基因功能研究奠定基础。  相似文献   
8.
羊口疮(Orf)是由羊口疮病毒(ORFV)引起的人畜共患的一种急性、接触性和具有高度嗜上皮性传染病,主要感染绵羊、山羊和人。由于该病缺乏全身性感染症状,因此在防治上也缺乏有效的疫苗或抗体。RNA干扰技术是目前较为成熟的抑制目的基因表达生物技术。ORFV的DNA ploymerase是病毒复制的关键酶。研究运用RNA干扰技术针对ORFV的DNAploymerase基因进行体外基因沉默研究,通过网络自动筛选平台设计并合成3个short-hairpin RNAs(shRNAs)片段,并与含U6启动子的pLL3.7质粒构建重组载体,结果表明pLL3.7-D596为重组阳性,进一步测序结果正确。研究可以为靶向ORFV-DNAploymerase基因的体内基因沉默提供参考数据。  相似文献   
9.
The assay was aimed to isolate,culture and identify Orf virus (ORFV) in Chongqing area,and investigate the expression of the F1L gene sequence in E.coli,the virus in the scab samples collected from suspected ORFV infected lamb was isolated in MDBK cell.Moreover,the F1L gene was amplified by PCR and ligated into pET-32a for expression in E.coli.The recombinant plasmid pET-32a-F1L was constructed with the introduction of restriction enzymes NotⅠand EcoRⅠ.The isolated virus was ORFV.SDS-PAGE analysis and Western blotting showed that the target protein was highly expressed with 57.4 ku in lenght at 5 h in E.coli as inclusion bodies and had good reactivity.  相似文献   
10.
The study was aimed to clonie and express ORF059 gene of Orf virus (ORFV).The genome of ORFV HCE attenuated vaccine strain was extracted and used as the template.Based on the referenced gene sequences of ORF059 gene on GenBank,the specific primers were designed,the fragment of ORF059 gene was amplified by PCR.After being purified,ORF059 gene was inserted into pEGFP-N1 vector to construct recombinant plasmid pEGFP-ORF059-N1.After being sequenced,the recombinant plasmid pEGFP-ORF059-N1 was transfected into NIH3T3 cells with liposomes.The expression of fusion protein was identified by the fluorescence microscope observation and Western blotting.The results showed that the ORF059 gene was 1 005 bp.The recombinant plasmid pEGFP-ORF059-N1 was constructed correctly.Green fluorescence could be observed in NIH3T3 cells transfected by pEGFP-ORF059-N1 under the fluorescence microscope.The expressed fusion protein was about 64 ku.The results laid a foundation for the further research on the mechanism of ORF059.  相似文献   
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