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    • 4. 发明公开
    • NOVEL HEV ANTIGENIC PEPTIDE AND METHODS
    • 新型HEV抗原肽和方法
    • EP1461357A2
    • 2004-09-29
    • EP00960932.2
    • 2000-09-28
    • Yang Sheng Tang Company, Ltd.
    • NG,Mun,HonDept.of Microbio.The Uni.of Hong KongIM,StanleyDept.of Microbio.The Uni.of Hong KongZHANG,Ji-ZhongDep.of Microbio.The Uni. HongKong
    • C07K14/005
    • C07K14/005A61K39/00C07K16/10C07K2319/00C12N2770/28122G01N33/5767Y10S435/975
    • A highly immunoreactive viral peptide, pE2, is disclosed which is derived form the carboxy-terminal end region of ORF2 region of the hepatitis E virus (HEV) genome. A unique feature of the novel pE2 peptide is that it possesses conformational antigenic determinants which are only exposed when monomers of the peptide associate with one another through non-covalent interactions to naturally form homodimers. The novel pE2 peptide is proven to be highly reactive with sera from patients having current or past infection with HEV which suggests that the homodimer may mimic certain structural features of the HEV capsid protein. Furthermore, the antigenic activity of the pE2 peptide is strictly conformational in nature and therefore, exhibits immunochemical reactivity only when the peptide exists in a dimeric form. Consequently, the antigenic activity is lost upon dissociation of the dimers, but the activity is restored when the monomers reassociate to form dimers. Moreover, diagnostic methods useful in detecting and diagnosing HEV infection, and the use of a vaccine composition effective in preventing hepatitis E virus infection in which the novel pE2 peptide is utilized are also disclosed.
    • 公开了高度免疫反应性病毒肽pE2,其衍生自戊型肝炎病毒(HEV)基因组的ORF2区的羧基末端区域。 新型pE2肽的独特特征是它具有构象性抗原决定簇,其仅在肽的单体通过非共价相互作用相互缔合以自然形成同型二聚体时才暴露。 证明新型pE2肽与来自患有目前或过去感染HEV的患者的血清高度反应,这表明同源二聚体可以模拟HEV衣壳蛋白的某些结构特征。 此外,pE2肽的抗原活性在本质上是严格构象的,因此只有当肽以二聚体形式存在时才表现出免疫化学反应性。 因此,二聚体解离后抗原活性丧失,但当单体重新缔合形成二聚体时活性恢复。 此外,还公开了可用于检测和诊断HEV感染的诊断方法,以及使用有效预防戊型肝炎病毒感染的疫苗组合物,其中使用新的pE2肽。