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Immature and mature human astrovirus: Structure, conformational changes, and similarities to hepatitis e virus

机译:不成熟的人类星状病毒:结构,构象变化以及与戊型肝炎病毒的相似性

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Human astroviruses (HAstVs) are a major cause of gastroenteritis. HAstV assembles from the structural protein VP90 and undergoes a cascade of proteolytic cleavages. Cleavage to VP70 is required for release of immature particles from cells, and subsequent cleavage by trypsin confers infectivity. We used electron cryomicroscopy and icosahedral image analysis to determine the first experimentally derived, three-dimensional structures of an immature VP70 virion and a fully proteolyzed, infectious virion. Both particles display T = 3 icosahedral symmetry and nearly identical solid capsid shells with diameters of ~ 350 ?. Globular spikes emanate from the capsid surface, yielding an overall diameter of ~ 440 ?. While the immature particles display 90 dimeric spikes, the mature capsid only displays 30 spikes, located on the icosahedral 2-fold axes. Loss of the 60 peripentonal spikes likely plays an important role in viral infectivity. In addition, immature HAstV bears a striking resemblance to the structure of hepatitis E virus (HEV)-like particles, as previously predicted from structural similarity of the crystal structure of the astrovirus spike domain with the HEV P-domain [Dong, J., Dong, L., Méndez, E. & Tao, Y. (2011). Crystal structure of the human astrovirus capsid spike. Proc. Natl. Acad. Sci. USA 108, 12681-12686]. Similarities between their capsid shells and dimeric spikes and between the sequences of their capsid proteins suggest that these viral families are phylogenetically related and may share common assembly and activation mechanisms.
机译:人类星状病毒(HAstVs)是胃肠炎的主要原因。 HAstV从结构蛋白VP90组装并经历级联的蛋白水解切割。需要裂解VP70才能从细胞中释放未成熟的颗粒,随后通过胰蛋白酶裂解可赋予感染力。我们使用电子冷冻显微镜和二十面体图像分析来确定未成熟的VP70病毒体和完全蛋白水解的感染性病毒体的第一个实验衍生的三维结构。这两个粒子都显示出T = 3二十面体对称性,并且直径约350?的固体衣壳几乎相同。衣壳表面放射出球状尖刺,总直径约440?。未成熟的粒子显示90个二聚体峰,而成熟的衣壳仅显示30个峰(位于二十面体2倍轴上)。 60个戊四烯峰值的损失可能在病毒感染性中起重要作用。此外,未成熟的HAstV与戊型肝炎病毒(HEV)样颗粒的结构极为相似,如先前从星状病毒刺突域的晶体结构与HEV P域的结构相似性所预测的[Dong,J., Dong,L.,Méndez,E.&Tao,Y.(2011年)。人类星状病毒衣壳突突的晶体结构。进程Natl。学院科学USA 108,12681-12686]。它们的衣壳和二聚体突峰之间以及衣壳蛋白序列之间的相似性表明,这些病毒家族在系统发育上相关,并且可能具有共同的组装和激活机制。

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