Four monoclonal antibodies (MAbs) against Goose Parvovirus (GPV) VP3 protein already available were used to precisely locate linear B-cell epitopes in VP3 of GPV. The epitopes, recognized by four MAbs, had already bee...Four monoclonal antibodies (MAbs) against Goose Parvovirus (GPV) VP3 protein already available were used to precisely locate linear B-cell epitopes in VP3 of GPV. The epitopes, recognized by four MAbs, had already been identified at low levels of resolution. Complementary oligonucleotides encoding ten amino acid fragments, with five amino acid overlaps were designed with suitable sticky ends for recombination with pET-32a and subsequent expression as small-fragment fusion proteins. Antigenicity of specific oligopeptides was determined by Western blotting with the MAbs. Using the same methods, amino acids were deleted one by one from the peptides of interest, enabling the two epitopes to be precisely located at amino acids 430-435 (-DRIMNP-) and 643-647 (-VFIKN-).展开更多
[Objective] The paper was to develop a subunit vaccine candidate for prevention and control of goose parvovirus infection. [Method]Based on the prokaryotic expression system, the antigenic epitopes and locations of th...[Objective] The paper was to develop a subunit vaccine candidate for prevention and control of goose parvovirus infection. [Method]Based on the prokaryotic expression system, the antigenic epitopes and locations of the structural protein VP3 were predicted by software analysis,and the region displaying a large portion of antigenic epitopes was amplified by PCR. The target VP3 DNA fragment was inserted into pET-30 a-VP3 vector, was transformed into Escherichia coli BL21 competent cells for protein expression and animal test. The SPF chickens were immunized with the recombinant protein and the antisera were collected for neutralization test by using a goose embryo fibroblast. [Result] The recombinant plasmid was constructed, and the target region of VP3 protein was expressed efficiently in a soluble form. The neutralizing titers of antisera could reach up to-2.608. [Conclusion] The target region displaying a large portion of antigenic epitopes of the structural protein VP3 could be expressed efficiently in soluble form, and the expressed protein could induce neutralizing antibodies in SFP chicken.展开更多
目的从人心脏cDNA文库中筛选与B3型柯萨奇病毒(coxsackievirus group B type 3,CVB3)结构蛋白VP3相互作用的蛋白,为进一步研究CVB3分子致病机制提供新的线索。方法构建酵母双杂交重组质粒(pGBKT7-VP3),转化至感受态酵母菌AH109,检测BD-c...目的从人心脏cDNA文库中筛选与B3型柯萨奇病毒(coxsackievirus group B type 3,CVB3)结构蛋白VP3相互作用的蛋白,为进一步研究CVB3分子致病机制提供新的线索。方法构建酵母双杂交重组质粒(pGBKT7-VP3),转化至感受态酵母菌AH109,检测BD-cMyc-VP3融合蛋白自激活,应用酵母双杂交筛选与CVB3VP3相互作用的人心脏蛋白。对阳性候选克隆进行测序和同源性比对分析;α-半乳糖苷酶活性定量分析VP3与各阳性蛋白之间相互作用的强弱。结果诱饵质粒pGBKT7-VP3构建成功,检测到BD-cMyc-VP3融合蛋白在AH109中表达,且诱饵蛋白VP3在酵母中不存在自激活,从人心脏cDNA文库中筛选到10个与CVB3VP3相互作用的蛋白:真核翻译起始因子4A2、羟酰辅酶A脱氢酶三官能蛋白转录变体3、肌钙蛋白I3型、平滑肌蛋白3、线粒体乙醛脱氢酶2等。结论本研究成功应用酵母双杂交技术筛选出与CVB3VP3相互作用的10个蛋白。为研究CVB3引起心肌炎和心肌疾病的分子致病机制提供了一些新的线索。展开更多
In order to testify the antitumor effect, especially its effect against liver carcinoma in vivo, of VP3 protein, one kind of protein coded by chicken anemia virus, recombinants pcDNA-vp3 containing chicken anemia viru...In order to testify the antitumor effect, especially its effect against liver carcinoma in vivo, of VP3 protein, one kind of protein coded by chicken anemia virus, recombinants pcDNA-vp3 containing chicken anemia virus vp3 gene, and control vector pcDNA3 were mixed with murine liver carcinoma cell lines H22 respectively. The mixture was injected subcutaneously into Balb/C mice. Some days later, the mice were killed and the solid tumor weighed. The antitumor efficiency was evaluated. The manners of VP3 protein in vivo inducing tumor cell death were identified by using TUNEL assay. All the results suggested that the injection of pcDNA-vp3 and H22 mixture resulted in a significant reduction of tumor growth in mice when compared with the results of control groups. TUNEL assay revealed that VP3 induced apoptosis in vivo. All these indicated that CAV vp3 might be a potential new gene in reducing the growth rate of tumor cells in liver carcinoma or in other kind of solid tumors in vivo.展开更多
基金supported by Graveness item of the Department of Education of Heilongjiang(10546Z004)Tackle Key Problems item of Heilongjiang(GB01B503-02+1 种基金GB04B504)Science and Technology Tackle Key Problems item of Heilongjiang during the 12th Five-year Plan Period(GA09B302)
文摘Four monoclonal antibodies (MAbs) against Goose Parvovirus (GPV) VP3 protein already available were used to precisely locate linear B-cell epitopes in VP3 of GPV. The epitopes, recognized by four MAbs, had already been identified at low levels of resolution. Complementary oligonucleotides encoding ten amino acid fragments, with five amino acid overlaps were designed with suitable sticky ends for recombination with pET-32a and subsequent expression as small-fragment fusion proteins. Antigenicity of specific oligopeptides was determined by Western blotting with the MAbs. Using the same methods, amino acids were deleted one by one from the peptides of interest, enabling the two epitopes to be precisely located at amino acids 430-435 (-DRIMNP-) and 643-647 (-VFIKN-).
基金Supported by Youth Fund Project of Natural Science Foundation of Shandong Province(ZR2014CQ009)Science and Technology Development Program of Binzhou City(2013GG0304)
文摘[Objective] The paper was to develop a subunit vaccine candidate for prevention and control of goose parvovirus infection. [Method]Based on the prokaryotic expression system, the antigenic epitopes and locations of the structural protein VP3 were predicted by software analysis,and the region displaying a large portion of antigenic epitopes was amplified by PCR. The target VP3 DNA fragment was inserted into pET-30 a-VP3 vector, was transformed into Escherichia coli BL21 competent cells for protein expression and animal test. The SPF chickens were immunized with the recombinant protein and the antisera were collected for neutralization test by using a goose embryo fibroblast. [Result] The recombinant plasmid was constructed, and the target region of VP3 protein was expressed efficiently in a soluble form. The neutralizing titers of antisera could reach up to-2.608. [Conclusion] The target region displaying a large portion of antigenic epitopes of the structural protein VP3 could be expressed efficiently in soluble form, and the expressed protein could induce neutralizing antibodies in SFP chicken.
文摘目的从人心脏cDNA文库中筛选与B3型柯萨奇病毒(coxsackievirus group B type 3,CVB3)结构蛋白VP3相互作用的蛋白,为进一步研究CVB3分子致病机制提供新的线索。方法构建酵母双杂交重组质粒(pGBKT7-VP3),转化至感受态酵母菌AH109,检测BD-cMyc-VP3融合蛋白自激活,应用酵母双杂交筛选与CVB3VP3相互作用的人心脏蛋白。对阳性候选克隆进行测序和同源性比对分析;α-半乳糖苷酶活性定量分析VP3与各阳性蛋白之间相互作用的强弱。结果诱饵质粒pGBKT7-VP3构建成功,检测到BD-cMyc-VP3融合蛋白在AH109中表达,且诱饵蛋白VP3在酵母中不存在自激活,从人心脏cDNA文库中筛选到10个与CVB3VP3相互作用的蛋白:真核翻译起始因子4A2、羟酰辅酶A脱氢酶三官能蛋白转录变体3、肌钙蛋白I3型、平滑肌蛋白3、线粒体乙醛脱氢酶2等。结论本研究成功应用酵母双杂交技术筛选出与CVB3VP3相互作用的10个蛋白。为研究CVB3引起心肌炎和心肌疾病的分子致病机制提供了一些新的线索。
文摘In order to testify the antitumor effect, especially its effect against liver carcinoma in vivo, of VP3 protein, one kind of protein coded by chicken anemia virus, recombinants pcDNA-vp3 containing chicken anemia virus vp3 gene, and control vector pcDNA3 were mixed with murine liver carcinoma cell lines H22 respectively. The mixture was injected subcutaneously into Balb/C mice. Some days later, the mice were killed and the solid tumor weighed. The antitumor efficiency was evaluated. The manners of VP3 protein in vivo inducing tumor cell death were identified by using TUNEL assay. All the results suggested that the injection of pcDNA-vp3 and H22 mixture resulted in a significant reduction of tumor growth in mice when compared with the results of control groups. TUNEL assay revealed that VP3 induced apoptosis in vivo. All these indicated that CAV vp3 might be a potential new gene in reducing the growth rate of tumor cells in liver carcinoma or in other kind of solid tumors in vivo.
