Growth and Differentiation Factor-8(GDF-8) is a new member of TGF-β super-family.It has been shown that GDF-8 is specifically expressed in skeleton muscle in mouse and its function is to inhibit the growth of muscle ...Growth and Differentiation Factor-8(GDF-8) is a new member of TGF-β super-family.It has been shown that GDF-8 is specifically expressed in skeleton muscle in mouse and its function is to inhibit the growth of muscle cell,so it is named as Myostatin.Here,we amplified 3′half-length GDF-8 cDNA from chicken skeleton muscle by RT-PCR,and cloned it into the prokaryotic expression vector pTrcHisB,which was then transformed into E.coli Top10 cells.The recombinant 6×His-GDF-8 fusion protein expressed in the Top10 cells was purified by Ni+-Affinity Chromatography for future study.展开更多
内源性抗菌多肽防御素是机体先天性免疫系统的重要组成部分,可帮助机体防御外界病原微生物的入侵。鸡β-防御素-1(G a llinac in-1,G a l-1)对许多致病菌都具有杀菌作用,具有很好的研究开发价值。本研究利用PCR技术从重组质粒pGEM-TE as...内源性抗菌多肽防御素是机体先天性免疫系统的重要组成部分,可帮助机体防御外界病原微生物的入侵。鸡β-防御素-1(G a llinac in-1,G a l-1)对许多致病菌都具有杀菌作用,具有很好的研究开发价值。本研究利用PCR技术从重组质粒pGEM-TE asy-ga l-1中克隆出G a l-1基因成熟肽区,将该基因插入原核表达载体pET-32a(+)中,构建重组质粒pET-32a(+)-ga l-1,然后用重组质粒转化大肠杆菌BL-21。挑选阳性克隆菌,用浓度为0.5 mm o l/L的IPTG进行诱导表达。SDS-PAGE电泳显示在目标位置约25kD处出现了条带并用W erstern B lot进行了鉴定。表明G a l-1基因在大肠杆菌以融合形式得到了表达。经灰度扫描显示重组蛋白表达量占细菌总蛋白的15.54%。用50%N i-NTA纯化树脂进行层析纯化,在洗脱液E中出现单一条带。G a l-1多肽在pET-32a(+)质粒表达体系中成功表达为鸡防御素多肽下一步的研究奠定基础。展开更多
[Objectives]This study was conducted to explore rapid and large-scale screening and detection of peste des petits ruminants(PPR),so as to provide important technical means for prevention,control and purification of PP...[Objectives]This study was conducted to explore rapid and large-scale screening and detection of peste des petits ruminants(PPR),so as to provide important technical means for prevention,control and purification of PPR.[Methods]Soluble N protein and NH fusion protein were successfully obtained in an Escherichia coli expression system by optimizing E.coli codon and expression conditions.Furthermore,based on purified soluble N protein and NH fusion protein,a double-antigen sandwich time-resolved fluorescence immunoassay method for detection of peste des petits ruminants virus(PPRV)was established.[Results]The method has high sensitivity and specificity and can specifically detect the antibody against PPRV in sheep serum,and it has no cross reaction with other related diseases.The method was used to detect 292 clinical samples,and compared with French IDVET competition ELISA kit.The coincidence rates of positive samples and negative samples from the two kinds of test kits were 92.47%and 97.26%,respectively,and the overall coincidence rate was 94.86%.The intra-group and inter-group coefficients of variation in the repeatability test were less than 10%.[Conclusions]Compared with the traditional ELISA method,the double-antigen sandwich time-resolved fluorescence immunoassay for detection of PPRV has equivalent sensitivity and specificity,and simple and rapid operation,and thus high application and popularization value.展开更多
[Objectives]This study was conducted to establish a rapid quantitative method for detecting antibody against Peste des Petits Ruminants Virus(PPR V)in sheep serum.[Methods]Soluble N protein and NH fusion protein were ...[Objectives]This study was conducted to establish a rapid quantitative method for detecting antibody against Peste des Petits Ruminants Virus(PPR V)in sheep serum.[Methods]Soluble N protein and NH fusion protein were obtained in Escherichia coli prokaryotic expression system by optimizing codons and expression conditions of E.coli.Furthermore,based on the purified soluble N protein and NH fusion protein,a high-sensitivity fluorescence immunoassay kit for detecting the antibody against PPR V was established.[Results]The method could quickly and quantitatively detect PPR V antibody in sheep serum,with high sensitivity and specificity,without any cross reaction to other related sheep pathogens.The intra-batch and inter-batch coefficients of variation were less than 10%and 15%,respectively,and the method had good repeatability.Through detection on 292 clinical serum samples,it was compared with the French IDVET competitive ELISA kit,and the coincidence rate of the two methods reached 93.84%.Compared with the serum neutralization test,the detected titer value of the high-sensitivity rapid fluorescence quantitative detection method was basically consistent with the tilter value obtained by the neutralization test on the standard positive serum(provided by the WOAH Brucellosis Reference Laboratory of France).[Conclusions]This method can realize rapid quantitative detection of PPR V antibody on site,and has high practical value and popularization value.展开更多
文摘Growth and Differentiation Factor-8(GDF-8) is a new member of TGF-β super-family.It has been shown that GDF-8 is specifically expressed in skeleton muscle in mouse and its function is to inhibit the growth of muscle cell,so it is named as Myostatin.Here,we amplified 3′half-length GDF-8 cDNA from chicken skeleton muscle by RT-PCR,and cloned it into the prokaryotic expression vector pTrcHisB,which was then transformed into E.coli Top10 cells.The recombinant 6×His-GDF-8 fusion protein expressed in the Top10 cells was purified by Ni+-Affinity Chromatography for future study.
文摘内源性抗菌多肽防御素是机体先天性免疫系统的重要组成部分,可帮助机体防御外界病原微生物的入侵。鸡β-防御素-1(G a llinac in-1,G a l-1)对许多致病菌都具有杀菌作用,具有很好的研究开发价值。本研究利用PCR技术从重组质粒pGEM-TE asy-ga l-1中克隆出G a l-1基因成熟肽区,将该基因插入原核表达载体pET-32a(+)中,构建重组质粒pET-32a(+)-ga l-1,然后用重组质粒转化大肠杆菌BL-21。挑选阳性克隆菌,用浓度为0.5 mm o l/L的IPTG进行诱导表达。SDS-PAGE电泳显示在目标位置约25kD处出现了条带并用W erstern B lot进行了鉴定。表明G a l-1基因在大肠杆菌以融合形式得到了表达。经灰度扫描显示重组蛋白表达量占细菌总蛋白的15.54%。用50%N i-NTA纯化树脂进行层析纯化,在洗脱液E中出现单一条带。G a l-1多肽在pET-32a(+)质粒表达体系中成功表达为鸡防御素多肽下一步的研究奠定基础。
基金Supported by National Key R&D Program for the Prevention and Control of Major Exotic Animal Diseases(2022YFD1800500)National Mutton Sheep Industrial Technology System(CARS39)+2 种基金Key Research and Development Program of Shandong Province(Major Science and Technology Innovation Project)(2021CXGC011306)Scientific Research Project of General Administration of Customs(2024HK033)Scientific Research Project of Jinan Customs(2023JK005).
文摘[Objectives]This study was conducted to explore rapid and large-scale screening and detection of peste des petits ruminants(PPR),so as to provide important technical means for prevention,control and purification of PPR.[Methods]Soluble N protein and NH fusion protein were successfully obtained in an Escherichia coli expression system by optimizing E.coli codon and expression conditions.Furthermore,based on purified soluble N protein and NH fusion protein,a double-antigen sandwich time-resolved fluorescence immunoassay method for detection of peste des petits ruminants virus(PPRV)was established.[Results]The method has high sensitivity and specificity and can specifically detect the antibody against PPRV in sheep serum,and it has no cross reaction with other related diseases.The method was used to detect 292 clinical samples,and compared with French IDVET competition ELISA kit.The coincidence rates of positive samples and negative samples from the two kinds of test kits were 92.47%and 97.26%,respectively,and the overall coincidence rate was 94.86%.The intra-group and inter-group coefficients of variation in the repeatability test were less than 10%.[Conclusions]Compared with the traditional ELISA method,the double-antigen sandwich time-resolved fluorescence immunoassay for detection of PPRV has equivalent sensitivity and specificity,and simple and rapid operation,and thus high application and popularization value.
基金Supported by The National Project for the Prevention and Control of Major Exotic Animal Diseases(2022YFD1800500)National Mutton Sheep Industrial Technology System(CARS39).
文摘[Objectives]This study was conducted to establish a rapid quantitative method for detecting antibody against Peste des Petits Ruminants Virus(PPR V)in sheep serum.[Methods]Soluble N protein and NH fusion protein were obtained in Escherichia coli prokaryotic expression system by optimizing codons and expression conditions of E.coli.Furthermore,based on the purified soluble N protein and NH fusion protein,a high-sensitivity fluorescence immunoassay kit for detecting the antibody against PPR V was established.[Results]The method could quickly and quantitatively detect PPR V antibody in sheep serum,with high sensitivity and specificity,without any cross reaction to other related sheep pathogens.The intra-batch and inter-batch coefficients of variation were less than 10%and 15%,respectively,and the method had good repeatability.Through detection on 292 clinical serum samples,it was compared with the French IDVET competitive ELISA kit,and the coincidence rate of the two methods reached 93.84%.Compared with the serum neutralization test,the detected titer value of the high-sensitivity rapid fluorescence quantitative detection method was basically consistent with the tilter value obtained by the neutralization test on the standard positive serum(provided by the WOAH Brucellosis Reference Laboratory of France).[Conclusions]This method can realize rapid quantitative detection of PPR V antibody on site,and has high practical value and popularization value.
