将分别来自禽流感病毒A/Goose/Guangdong/3/96(H5N1)毒株的HA基因和A/Goose/Guangdong/1/96(H5N1)NP基因重组到禽痘病毒基因组中,获得了能同时高效表达这两种蛋白的重组禽痘病毒(rFPV HA NP)。将rFPV HA NP经翅膀刺种途径接种8周龄SPF鸡...将分别来自禽流感病毒A/Goose/Guangdong/3/96(H5N1)毒株的HA基因和A/Goose/Guangdong/1/96(H5N1)NP基因重组到禽痘病毒基因组中,获得了能同时高效表达这两种蛋白的重组禽痘病毒(rFPV HA NP)。将rFPV HA NP经翅膀刺种途径接种8周龄SPF鸡,并设亲本禽痘病毒免疫和非免疫对照组。免疫后4周分别用10LD50的高致病力禽流感病毒(HPAIV)A/Goose/Guangdong/1/96(H5N1)和A/FPV/Rostock/34(H7N1)毒株进行攻击。结果重组禽痘病毒rFPV HA NP免疫鸡群后能够诱导产生高水平的特异性抗体,可完全抵抗H5N1毒株的致死性攻击,并可有效阻止H7N1病毒攻击后病毒在泄殖腔的排出。而禽痘病毒免疫组和非免疫对照组在攻毒后全部发病并死亡。结果表明NP在与HA共同表达时,在诱导交叉保护性方面有一定的免疫增强功能。展开更多
Full-length nucleoproteins from Ebola and Marburg viruses were expressed as His-tagged recombinant proteins in Escherichia coli and nucleoprotein-based enzyme-linked immunosorbent assays(ELISAs) were established for t...Full-length nucleoproteins from Ebola and Marburg viruses were expressed as His-tagged recombinant proteins in Escherichia coli and nucleoprotein-based enzyme-linked immunosorbent assays(ELISAs) were established for the detection of antibodies specific to Ebola and Marburg viruses. The ELISAs were evaluated by testing antisera collected from rabbit immunized with Ebola and Marburg virus nucleoproteins. Although little cross-reactivity of antibodies was observed in antiEbola virus nucleoprotein rabbit antisera, the highest reactions to immunoglobulin G(Ig G) were uniformly detected against the nucleoprotein antigens of homologous viruses. We further evaluated the ELISA's ability to detect antibodies to Ebola and Marburg viruses using human sera samples collected from individuals passing through the Guangdong port of entry. With a threshold set at the mean plus three standard deviations of average optical densities of sera tested, the ELISA systems using these two recombinant nucleoproteins have good sensitivity and specificity. These results demonstrate the usefulness of ELISA for diagnostics as well as ecological and serosurvey studies of Ebola and Marburg virus infection.展开更多
Virus nucleoprotein (NP) is an emerging target for drug development for Influenza. We designed benzamide derivatives as new inhibitors of NP that demonstrate good potency in blocking influenza A. Screening revealed th...Virus nucleoprotein (NP) is an emerging target for drug development for Influenza. We designed benzamide derivatives as new inhibitors of NP that demonstrate good potency in blocking influenza A. Screening revealed that compound 39 was the most potent molecule in the series, exhibiting IC<sub>50</sub> values of 0.46 and 0.27 μM in blocking the replication of H3N2 (A/HK/8/68) and (A/WSN/33) influenza A viral strains. The observed inhibition of viral replication correlated well with cytopathic protection. Furthermore, based on computational analysis and fluorescence microscopy, it was determined that compound 39 inhibited nuclear accumulation by targeting influenza A viral nucleoproteins. Finally, the rodent pharmacokinetic profile of compound 32 displayed half-life of greater than 4 hours and bioavailability greater than 20%, suggesting this class of molecules had drug-like properties.展开更多
甲型流感病毒(influenza A virus,IAV)严重威胁人类健康。病毒核心是核糖核蛋白复合物(viral ribonucleoprotein complexes,vRNPs),是病毒基因组转录和复制的最小功能单位。核蛋白(nucleoprotein,NP)是vRNP的重要组成部分之一,在流感病...甲型流感病毒(influenza A virus,IAV)严重威胁人类健康。病毒核心是核糖核蛋白复合物(viral ribonucleoprotein complexes,vRNPs),是病毒基因组转录和复制的最小功能单位。核蛋白(nucleoprotein,NP)是vRNP的重要组成部分之一,在流感病毒整个生命周期起着关键作用。机体存在多种宿主因子通过NP影响病毒增殖。本文就通过NP影响vRNP核输入、病毒基因组转录和复制、vRNP核输出以及vRNP组装这几个方面的宿主因子进行综述,以期为治疗IAV新靶点的发现及新药物的研发提供参考。展开更多
文摘将分别来自禽流感病毒A/Goose/Guangdong/3/96(H5N1)毒株的HA基因和A/Goose/Guangdong/1/96(H5N1)NP基因重组到禽痘病毒基因组中,获得了能同时高效表达这两种蛋白的重组禽痘病毒(rFPV HA NP)。将rFPV HA NP经翅膀刺种途径接种8周龄SPF鸡,并设亲本禽痘病毒免疫和非免疫对照组。免疫后4周分别用10LD50的高致病力禽流感病毒(HPAIV)A/Goose/Guangdong/1/96(H5N1)和A/FPV/Rostock/34(H7N1)毒株进行攻击。结果重组禽痘病毒rFPV HA NP免疫鸡群后能够诱导产生高水平的特异性抗体,可完全抵抗H5N1毒株的致死性攻击,并可有效阻止H7N1病毒攻击后病毒在泄殖腔的排出。而禽痘病毒免疫组和非免疫对照组在攻毒后全部发病并死亡。结果表明NP在与HA共同表达时,在诱导交叉保护性方面有一定的免疫增强功能。
基金supported by Important National Science & Technology Specific Projects (2012ZX10004403)
文摘Full-length nucleoproteins from Ebola and Marburg viruses were expressed as His-tagged recombinant proteins in Escherichia coli and nucleoprotein-based enzyme-linked immunosorbent assays(ELISAs) were established for the detection of antibodies specific to Ebola and Marburg viruses. The ELISAs were evaluated by testing antisera collected from rabbit immunized with Ebola and Marburg virus nucleoproteins. Although little cross-reactivity of antibodies was observed in antiEbola virus nucleoprotein rabbit antisera, the highest reactions to immunoglobulin G(Ig G) were uniformly detected against the nucleoprotein antigens of homologous viruses. We further evaluated the ELISA's ability to detect antibodies to Ebola and Marburg viruses using human sera samples collected from individuals passing through the Guangdong port of entry. With a threshold set at the mean plus three standard deviations of average optical densities of sera tested, the ELISA systems using these two recombinant nucleoproteins have good sensitivity and specificity. These results demonstrate the usefulness of ELISA for diagnostics as well as ecological and serosurvey studies of Ebola and Marburg virus infection.
文摘Virus nucleoprotein (NP) is an emerging target for drug development for Influenza. We designed benzamide derivatives as new inhibitors of NP that demonstrate good potency in blocking influenza A. Screening revealed that compound 39 was the most potent molecule in the series, exhibiting IC<sub>50</sub> values of 0.46 and 0.27 μM in blocking the replication of H3N2 (A/HK/8/68) and (A/WSN/33) influenza A viral strains. The observed inhibition of viral replication correlated well with cytopathic protection. Furthermore, based on computational analysis and fluorescence microscopy, it was determined that compound 39 inhibited nuclear accumulation by targeting influenza A viral nucleoproteins. Finally, the rodent pharmacokinetic profile of compound 32 displayed half-life of greater than 4 hours and bioavailability greater than 20%, suggesting this class of molecules had drug-like properties.
文摘甲型流感病毒(influenza A virus,IAV)严重威胁人类健康。病毒核心是核糖核蛋白复合物(viral ribonucleoprotein complexes,vRNPs),是病毒基因组转录和复制的最小功能单位。核蛋白(nucleoprotein,NP)是vRNP的重要组成部分之一,在流感病毒整个生命周期起着关键作用。机体存在多种宿主因子通过NP影响病毒增殖。本文就通过NP影响vRNP核输入、病毒基因组转录和复制、vRNP核输出以及vRNP组装这几个方面的宿主因子进行综述,以期为治疗IAV新靶点的发现及新药物的研发提供参考。
