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从70年前的晶体样本中确定的一种努迪病毒封闭体蛋白的原子结构
Jeremy R Keown1, Adam D Crawshaw2, Jose Trincao2
1Division of Structural Biology, Wellcome Centre for Human Genetics, University of Oxford, Oxford, UK. Jeremy@strubi.ox.ac.uk.
Nature communications
|July 13, 2023
概括
研究人员确定了Nudiviridae病毒蛋白质晶体的结构,揭示了独特的组装机制. 这一发现扩大了我们对病毒封闭体及其组装原理的理解.
科学领域:
- 结构生物学是结构生物学.
- 病毒学 病毒学
- 生物化学 生化学
背景情况:
- 传染性蛋白质晶体,称为闭合体或多面体,对于双链DNA的生命周期至关重要 Baculoviridae 和双链RNAcypoviruses.
- 这些结晶蛋白组件封装新形成的病毒,在病毒生命周期期间保护它们.
研究的目的:
- 为了确定来自Nudiviridae的多面体的三维结构,一个双链DNA病毒家族.
- 将Nudiviridae多面体结构与Baculoviridae和Cypoviridae的结构进行比较,以了解闭合体组装的共同原则.
主要方法:
- 采用X射线晶体学来确定Nudiviridae中的多面体的原子结构.
- 在Nudiviridae多面体和来自其他病毒家族的同类蛋白质之间进行了结构比较.
主要成果:
- 结构揭示了一个由主要的α-螺旋结构块形成的有序格子.
- 网格通过广泛的疏水和静电相互作用,二硫化键和域切换来维持,从而形成高度相互连接和稳定的蛋白质晶体.
- 努迪维里代的多面体结构,晶体空间组和单元细胞尺寸与百科病毒和cypovirus多面体的不同.
结论:
- 尽管有结构上的差异,但所有特征的多面体都使用了相同的基本原则来组装闭合体.
- 这些发现为病毒封闭体的结构多样性和保存的组装机制提供了新的见解.
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