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1.
目的获得7型腺病毒(Ad7)疫苗株87mu-97.4mu核苷酸序列,分析该区段的基因结构和功能。方法应用Sanger双脱氧法进行核苷酸序列分析。结果Ad7疫苗株87mu-97.4mu全长3698个核苷酸,推测编码纤维蛋白(325个氨基酸)和E3区15.4kD蛋白,E4区5个蛋白(ORF14.2,ORF15.7,ORF8.1,ORF42.8和ORF10.3)。结论这一结果为阐明Ad7的基因结构与功能及利用该病毒做为基因工程疫苗载体打下一定的基础  相似文献   

2.
目的获得7型腺病毒疫苗株DNA左侧0~175mu片段克隆,分析0~48mu片段(末端倒置重复序列、包装信号位点和Ela区)核苷酸序列。方法从Ad7疫苗株感染的A549细胞提取Ad7DNA,将其03~175mu片段克隆到质粒pAd7T,并用自动和银染方法测序。结果获得了Ad7疫苗株左侧175mu片段克隆,测定了左侧1737bp核苷酸序列,其中Ela区所编码的6300、24000、28000等3个蛋白的DNA序列,与Gomen株的同源性分别为989%、973%和975%,推导编码氨基酸的同源性分别为966%、965%和969%。这3个蛋白与Grider株的同源性分别为100%、997%、和997%;推导编码氨基酸的同源性分别为100%、991%和992%。结论Ad7疫苗株左侧1738bp核苷酸与Ad7Gomen株和Grider株相应片段,具有高度的同源性。  相似文献   

3.
目的获得7型腺病毒(Ad7)载体构建的基本元件,为构建Ad7载体及阐明其基因组一级结构打下基础。方法用改良Hirts法提取Ad7DNA,酶切后克隆于质粒载体,克隆了XhoⅠA+D片段(170-765mu)、D片段(170-229mu)、E片段(108-141mu)、F+G片段(141-170mu)、G片段(158-170),用EcoRⅠ+XhoⅠ双酶切,克隆了765-87mu,用SamⅠ+EcoRⅠ双酶切,克隆了870-974mu。用腺病毒DNA做为模板测定了Ad7疫苗株右侧末端SmaⅠH片段(974-100mu)核酸苷序列,根据所测序列设计引物,用聚合酶链反应(PCR)获得右侧末端,并对其再次测序证实。结果建立了Ad7疫苗株部分基因文库(108-100mu),完成Ad7疫苗株SmaⅠH片段核苷酸序列。结论这一结果为阐明Ad7基因组一级结构及构建Ad7载体奠定了基础。  相似文献   

4.
目的 获得7型腺病毒疫苗株DNA左侧0-17.5mu片段克隆,分析0-4.8mu片段(末端倒置重复序列,包装信号位点和Ela区)核苷酸序列,。方法从Ad7疫苗株感染的A549细胞提取Ad7 DNA,将其0.3-17.5mu片段克隆到质粒pAd7T,并用自动和银染方法测序。结果 获得了Ad7疫苗株左侧17.5mu片段克隆,测定了左侧1737bp核苷酸序列,其中Ela区所编码的6300,24000,2  相似文献   

5.
7型腺病毒疫苗株载体的构建及β—半乳糖苷酶基因 …   总被引:1,自引:1,他引:0  
目的 构建E3区缺失的7型腺病毒疫苗株(Ad7v)载体并表达β-半乳糖苷酶基因。方法 从人二倍体细胞的W138培养的Ad7v中分离病毒DNA,利用Ad7vDNA天然的酶切位点,经过多步亚克隆,克隆的同时将E3区78.8-87mu片段缺失,并将多克隆酶切位点带入Ad7v载体。为了验证载体的功能,将带有巨细胞病毒(CMV)早期启动子β-半乳糖苷酶基因插入缺失的E3区。将这一重组质粒和EcoRI酶切Ad  相似文献   

6.
目的构建E3区缺失的7型腺病毒疫苗株(Ad7v)载体并表达β半乳糖苷酶基因。方法从人二倍体细胞W138培养的Ad7v中分离病毒DNA,利用Ad7vDNA天然的酶切位点,经过多步亚克隆,克隆的同时将E3区78887mu片段缺失,并将多克隆酶切位点带入Ad7v载体。为了验证载体的功能,将带有巨细胞病毒(CMV)早期启动子β半乳糖苷酶基因插入缺失的E3区。将这一重组质粒和EcoRⅠ酶切Ad7vDNA共转染293细胞,获得表达β半乳糖苷酶重组病毒。结果构建了缺失部分E3区Ad7v载体,在CMV启动子的作用下该载体能有效地表达外源基因。结论Ad7v载体的构建并成功表达外源基因为开发和应用这一载体打下了重要的基础  相似文献   

7.
我国登革2型病毒43株非结构蛋白NS1基因的特征   总被引:1,自引:0,他引:1  
对我国1987年从广西分离的登革2型病毒43株非结构蛋白NS1基因的核苷酸序列进行了分析,结果表明登革2型病毒43株非结构蛋白NS1基因含有1056核苷酸编码352个氨基酸,并就其核苷酸序列及其相应的氨基酸序列与我国1985年海南流行高峰期分离的D2-04株、国际参考株新几内亚C株(NGC)、牙买加株(JAM)、候选疫苗株(S1)和马来西亚流行株M1(登革出血热)、M2(登革休克综合征)、M3(登革热)进行比较,发现核苷酸序列的同源性分别为92.2%,93.7%,93.3%,90.7%,89.9%,89.5%,89.3%,氨基酸的类似性分别为89.8%,92.6%,93.3%,91.2%,90.6%,90.1%,89;9%,推断的氨基酸序列含有两个糖基化位点,分别位于氨基酸残基的130和207位,一个可能的蛋白裂解位点350~352和10个保守的半胱氨酸残基。  相似文献   

8.
采用反转录-PCR方法,分节段扩增汉坦病毒A9株M基因片段cDNA,并克隆入pGEMT载体中,用双脱氧末端终止法直接测定序列。结果表明,A9株M片段cDNA由3618个碱基组成,编码1135个氨基酸,  核苷酸序列及由其推导的氨基酸序列同76/118株的同源性分别为94.33%和97.80%,说明汉坦病毒A9株与76/118株在糖蛋白的结构上高度保守。同76/118株比较,在3'末端非编码区变异极大,变异率为20%,且多了2个核苷酸。A9株M基因片段核苷酸序列的获得,为利用该cDNA进行基因工程疫苗的研制创造了条件。  相似文献   

9.
目的了解鸡减蛋综合征病毒(EDSV)的基因结构特征。方法从中国发病鸡群中分离的鸡减蛋综合征病毒弱毒株AA2,经常规法提取病毒核酸后,构建了用内切酶HindⅢ水解的完整基因文库,对其中A片段编码55K蛋白基因的核苷酸序列进行测定和分析。结果该读码框共1011个核苷酸,编码产物由337氨基酸组成,分子量为38200。氨基酸同源性分析表明,EDSV55K蛋白与人腺病毒(Ad2,Ad12,Ad40)、犬腺病毒(cav)、Ⅰ群禽腺病毒(celo)同源性在255%~324%之间,而与羊腺病毒(oav)的同源性达到464%。结论EDSV55K蛋白基因具有与腺病毒55K蛋白基因相似的结构,但变异较大。  相似文献   

10.
目的 明确广东鹅流感病毒296H5 N1 亚型毒株RNA13 和RNA5 节段核苷酸全序列及其所编码蛋白的氨基酸序列,以及这些基因节段与香港禽流感病毒15697H5 N1 亚型毒株相应节段间的关系。方法 病毒粒RNA经逆转录合成cDNA,经聚合酶链反应(PCR) 扩增,产物纯化,采用双脱氧链末端终止法进行核苷酸序列测定。结果 广东鹅流感病毒296H5 N1 亚型毒株RNA13 和RNA5 节段长度分别为2341,2 341 ,2 233 和1565 个核苷酸。它们分别编码PB2( 含759 个氨基酸),PB1( 含757个氨基酸) ,PA( 含716 个氨基酸) 和NP蛋白( 含498 个核苷酸) 。这些蛋白与香港禽流感病毒15697H5 N1 亚型毒株相应蛋白氨基酸序列的同源性分别为96-4% ,97-2% ,97-3 % 和97-0% 。结论 本毒株RNA13 和RNA5 节段长度分别为2 341,2 341,2 233 和1 565 个核苷酸,它们与香港15697H5 N1 亚型毒株间存在着差异  相似文献   

11.
7型腺病毒疫苗株序列测定及其六邻体特性分析   总被引:2,自引:0,他引:2  
目的 完成7型腺病毒疫苗株(Ad7v)的全序列测定并阐明其六邻体特征。方法 克隆Ad7v基因组17.5~68.0mu片段,应用Sanger双脱氧法进行DNA序列测定,将编码六邻体蛋白的核苷酸序列输入GenBank数据库中,获得录入号为AF515814。用CLUSTAL.V软件比较Ad7v与其他亚组及同一亚组腺病毒的六邻体蛋白的同源性,分析其抗原性的差异,同时用RasMol2.71软件预测Ad7v六邻体三维结构。结果 AdTv17.5~68.0mu由17596个碱基组成。这段基因r链主要编码晚期基因L1、L2和L3,L链编码E2的一部分。六邻体编码多肽位于L3区,由934个氨基酸残基组成,与其他9个已知的六邻体蛋白序列进行多序列同源性比较,发现Ad7/疫苗株与其他亚组腺病毒的同源性为86.8%(Ad4)~78.5%(Ad5)。在同一亚组中,Ad7疫苗株与Ad3同源性最高,高达95.1%。可变序列主要集中在7个高变区(HVRs),根据Ad2六邻体三维结构模型预测Ad7六邻体三维结构,发现可变区大部分位于六邻体顶端的I1和I2环中。结论 完成了AdTv的全序列分析,其六邻体序列与Ad5、Ad2等其他亚组病毒有很大差异,这一结果为构建新型腺病毒载体打下了基础。  相似文献   

12.
目的 获得7型腺病毒(Ad7)载体构建的基本元件,为构建Ad7载体及阐明其基因组一级结构打下基础。方法 用改良Hirts法提取Ad7DNA,酶切后克隆于质粒载体,克隆了Xho I A+D片段(17.0 ̄76.5mu)、D片段(17.0-22.9mu)、E片段(10.8-14.1mu)、F+G片段(14.1 ̄17.0mu)、G片段(15.8 ̄17.0),用EcoR I+Xho I双酶切,克隆了76.  相似文献   

13.
Analysis of early region 4 of porcine adenovirus type 3   总被引:4,自引:0,他引:4  
Li X  Babiuk LA  Tikoo SK 《Virus research》2004,104(2):181-190
The early region 4 (E4) of porcine adenovirus (PAdV)-3, located at the right-hand end of the genome is transcribed in a leftward direction and has the potential to encode seven (p1-p7) open reading frames (ORFs). To determine the role of each protein in viral replication, we constructed full-length PAdV-3 genomic clones containing deletions of individual E4 ORF or combined deletions of the neighboring ORFs. Transfection of swine testicular (ST) cells with individual E4 mutant plasmid DNAs generated PAdV-3 E4 mutant viruses except with plasmids containing a deletion of ORF p3, ORF p2+ p3 or ORF p3+ p4. Each of the mutants was further analyzed for growth kinetics, and early/late protein synthesis. Mutant viruses carrying deletions in ORF p1, ORF p2 or ORF p4 showed growth characteristics similar to that of wild-type PAdV-3. Early/late protein synthesis was also indistinguishable from that of wild-type PAdV-3. However, mutant viruses carrying deletions in ORF p5, ORF p6 or ORF p7 showed a modest effect in their ability to grow in porcine cells and express early proteins. These results suggest that the E4 ORF p3 (showing low homology with non-essential human adenovirus (HAdV)-9-E4 ORF1 encoded proteins) is essential for the replication of PAdV-3 in vitro. In contrast, the E4 ORF p7 (showing homology to essential HAdV-2 34 kDa protein) is not essential for replication of PAdV-3 in vitro. Moreover, successful deletion of 1.957 kb fragment in E4 region increased the available capacity of replication-competent PAdV-3 (E3 + E4 deleted) to approximately 4.3 kb and that of replication-defective PAdV-3 (E1 + E3 + E4 deleted) to approximately 7 kb. This is extremely useful for the construction of PAdV-3 vectors that express multiple genes and/or regulatory elements for gene therapy and vaccination.  相似文献   

14.
Characterization of the early region 3 and fiber genes of Ad7   总被引:8,自引:0,他引:8  
J S Hong  K G Mullis  J A Engler 《Virology》1988,167(2):545-553
The nucleotide sequence and the predicted amino acid sequences for open reading frames (ORFs) encoded in the Bam-Hl D fragment of Ad7 (Gomen) DNA show an organization and conservation of potential polypeptides between Ad3 and Ad7. Five ORFs encoded within early region 3 (E3) and shared with the corresponding region of Ad3 can be identified; four of these potential coding regions also share homology to ORFs found in E3 of Ad2 and Ad5. The fiber gene of late region 5 (L5) is also apparent within this region; S1 mapping experiments show that the 5' and 3' boundaries of the main exon in fiber mRNA lie at each end of the proposed fiber ORF. The predicted amino acid sequence for Ad7 fiber shares 60% amino acid homology to Ad3 fiber, but only 20% to Ad2 fiber. Surprisingly, there are three regions of partial amino acid homology near the N- and C-termini of the predicted fiber gene sequences from Ad2, Ad3, Ad5, and Ad7; these conserved regions may be important for interaction with penton base, for proper folding of the shaft of the molecule, or for recognition of the cellular receptor to which adenovirus attaches during infection.  相似文献   

15.
Sequence analysis in the E1 region of adenovirus type 4 DNA   总被引:11,自引:0,他引:11  
Adenovirus type 4 (Ad4) is the sole member of adenovirus group E based on overall DNA sequence homology, restriction endonuclease cleavage patterns, and the size of capsid proteins. We cloned the BamHI-F fragment from the left end of Ad4 in pUC13-1 between the SalI and BamHI sites in order to carry out the structural analysis of the E1A region of Ad4. The complete sequence of the BamHI-F fragment (2042 bp) has been determined. From the DNA sequence, the splice sites for the putative 12 S and 13 S mRNAs, encoded by the E1A region of Ad4 were deduced. If protein synthesis initiates at the first available AUG triplet (position 575), these 12 S and 13 S mRNAs would code for polypeptides containing 226 and 257 amino acids, respectively. Comparison of Ad4- and Ad7-13 S mRNA-coded polypeptides indicates that there is 57% homology, whereas the homology is only 38% with Ad12 and 31% with Ad2-13 S mRNA-coded polypeptides. The structural analysis in the E1 region of Ad4 also includes the coding region for the E1B 19-kDa protein. Ad4 and Ad7 shows 65% homology in the coding regions for E1B 19-kDa protein. Comparison of the DNA sequence of Ad4 with those of Ad2, Ad7, and Ad12 by using a dot matrix computer program and by Southern hybridization revealed that Ad4 bears a stronger homology with Ad7 than with Ad2 and Ad12 in this region. Hydropathy plots and alignments of the putative polypeptides coded by this region in Ad4 with those from the corresponding regions of different serotypes to reveal the highly conserved domains also support the above conclusion.  相似文献   

16.
The E1B transcription map of the enteric adenovirus type 41.   总被引:2,自引:0,他引:2  
A Allard  G Wadell 《Virology》1992,188(1):319-330
  相似文献   

17.
目的 构建缺失E3区78.9-86mu的4型腺病毒疫苗株载体。方法 从4型腺病毒疫苗株感染的人胚肺二倍体细胞2BS中提取病毒DNA,经过多卡亚克隆构建成功缺失78.9 ̄86mu的载体。将含有CMV早期启动子的β-半乳糖苷酶基因插入缺失部位,将这一重组质粒与Ad4Bcl1大片段共转染293细胞,铺含有X-Gal的营养琼脂,经蓝色斑斑纯化三代,ONPG法测定β-半乳糖苷酶基因的表达量。结果 所构建的载  相似文献   

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