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甲型肝炎病毒和皮科纳病毒的起源
Xiangxi Wang1, Jingshan Ren2, Qiang Gao1,3
1National Laboratory of Macromolecules, Institute of Biophysics, Chinese Academy of Science, Beijing, 100101, China.
Nature
|October 21, 2014
概括
甲型肝炎病毒 (HAV) 的结构显示出独特的稳定性和组合,与其他皮科纳病毒不同. 它的原始特征表明,现代和祖先的昆虫病毒之间存在联系.
科学领域:
- 病毒学 病毒学
- 结构生物学 结构生物学
- 分子生物学分子生物学
背景情况:
- 甲型肝炎病毒 (HAV) 在全球造成140万例病例,但仍未得到充分了解.
- 哈维病毒表现出不寻常的遗传和物理稳定性和包裹形式,使其与其他皮科纳病毒区别开来.
- 由于其独特的特征,研究HAV一直具有挑战性.
研究的目的:
- 为了阐明成熟的HAV粒子及其空的对应的高分辨率X射线结构.
- 研究HAV独特的稳定性和组装机制的结构基础.
- 了解HAV与其他皮科纳病毒的进化关系.
主要方法:
- 使用高分辨率的X射线晶体学来确定成熟和空的HAV粒子的结构.
- 片扫描用于识别病毒表面上的抗原位点.
- 进行了基于结构的遗传学分析,以确定HAV的进化位置.
主要成果:
- 成熟和空的HAV颗粒的结构几乎相同,成熟的病毒含有VP4,空的颗粒含有VP0.
- 病毒表面缺乏典型的受体结合部位的陷,HAV在高温和低pH值下异常稳定.
- HAV使用VP2"域互换"机制,这种机制是昆虫皮科纳类病毒的特征,并且缺乏口袋因素.
- 遗传学分析将HAV定位为典型的皮科纳病毒和昆虫病毒之间的中间体,保留了细胞对细胞转细胞的能力.
结论:
- 哈维病毒的独特结构和稳定性与其独特的组装和脱涂机制有关,与其他皮科纳病毒不同.
- 哈维病毒的结构特征表明,它代表了现代和原始昆虫皮科纳病毒之间的过渡形式.
- HAV进行细胞转移的能力凸显了其独特的生物特性和进化意义.
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