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Development and antigenic characterization of three recombinant proteins with potential for Glasser's disease prevention

机译:三种可能预防格拉瑟氏病的重组蛋白的开发和抗原表征

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Haemophilus parasuis is the causative agent of Glasser's disease, which causes high morbidity and mortality in piglets, leading to severe economic losses. The lack of a commercial vaccine against a broad spectrum of strains has limited the disease control. H. parasuis outer membrane proteins (OMPs) are potentially essential components for vaccine formulation. In this study, seven putative OMPs were selected from the annotated H. parasuis serovar 5 genome; they were predicted by bioinformatics and annotated as potential virulence-related factors. These proteins were cloned, expressed, and purified as His-tagged proteins. Antigenicity of the candidate proteins was assessed using Western blotting with convalescent sera against H. parasuis serovar 5. The immunogenicity of the seven OMPs was assessed in a guinea pig model. Except VacJ, all the other six recombinant proteins elicited a detectable antibody response. Anti sera against four of the selected proteins effectively killed the bacteria in vitro. Three proteins (Omp26, VacJ, and HAP5_0742) were found to confer significant protection against challenge with a lethal dose of H. parasuis in a guinea pig model. The results suggest that these three proteins have a strong potential to be vaccine candidates against Glasser's disease. (C) 2016 Elsevier Ltd. All rights reserved.
机译:副猪嗜血杆菌是格拉瑟氏病的病原体,它导致仔猪高发病率和高死亡率,导致严重的经济损失。缺乏针对广泛菌株的商业疫苗限制了疾病的控制。副猪嗜血杆菌的外膜蛋白(OMPs)是疫苗制剂的潜在必需成分。在这项研究中,从带注释的副猪嗜血杆菌血清型5基因组中选择了七个推定的OMP。它们是由生物信息学预测的,并被注释为潜在的毒力相关因素。这些蛋白被克隆,表达并纯化为带有His标签的蛋白。使用恢复期血清对副猪嗜血杆菌血清5的Western印迹法评估候选蛋白的抗原性。在豚鼠模型中评估了七个OMP的免疫原性。除VacJ外,所有其他六个重组蛋白均引起可检测的抗体反应。针对四种选定蛋白质的抗血清可在体外有效杀死细菌。在豚鼠模型中,发现了三种蛋白质(Omp26,VacJ和HAP5_0742)可提供对致命剂量副猪嗜血杆菌的有效保护,使其免受攻击。结果表明,这三种蛋白质具有很强的潜力,可以作为抵抗Glasser病的疫苗。 (C)2016 Elsevier Ltd.保留所有权利。

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