The structure of a plant-specific partitivirus capsid reveals a unique coat protein domain architecture with an intrinsically disordered protrusion.

The structure of a plant-specific partitivirus capsid reveals a unique coat protein domain architecture with an intrinsically disordered protrusion.
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植物特异性partitivirus衣壳的结构揭示了一个独特的外壳蛋白结构域的架构与内在的无序突起。

DOI:
10.1038/s42003-021-02687-w
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发表时间:
2021-10-06
影响因子:
5.9
通讯作者:
Sainsbury F
Sainsbury F
中科院分区:
生物学2区
文献类型:
--
作者:
Byrne M;Kashyap A;Esquirol L;Ranson N;Sainsbury F

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持久性植物病毒可能是野生植物中最常见的病毒。越来越多的证据表明,这类病毒与其宿主之间存在共生关系,这表明它们在生态和农业中发挥着重要作用。在这里,我们展示了植物特异性部分病毒辣椒隐病毒1号的衣壳结构,其分辨率为2.9 Å。结构特征,包括60个外壳蛋白二聚体的T = 1排列,与真菌部分病毒和dsRNA病毒的小核糖核酸病毒谱系共享。然而,衣壳的拓扑结构明显不同,突出部分来自外壳蛋白二聚体的结合界面。我们发现,在突起的顶端有一个紊乱的区域并不是衣壳组装所必需的,它代表了植物特异性部分病毒特有的高变位点。这些结果表明,部分病毒外壳蛋白获得额外功能的结构基础,使其能够与不同的植物宿主建立互惠关系。Byrne等人用Cryo-EM测定辣椒隐病毒1的结构。他们发现了一个紊乱的区域,形成了三角洲病毒衣壳突出的最外层,这是植物特异性属的特征。
Persistent plant viruses may be the most common viruses in wild plants. A growing body of evidence for mutualism between such viruses and their hosts, suggests that they play an important role in ecology and agriculture. Here we present the capsid structure of a plant-specific partitivirus, Pepper cryptic virus 1, at 2.9 Å resolution by Cryo-EM. Structural features, including the T = 1 arrangement of 60 coat protein dimers, are shared with fungal partitiviruses and the picobirnavirus lineage of dsRNA viruses. However, the topology of the capsid is markedly different with protrusions emanating from, and partly comprising, the binding interface of coat protein dimers. We show that a disordered region at the apex of the protrusion is not required for capsid assembly and represents a hypervariable site unique to, and characteristic of, the plant-specific partitiviruses. These results suggest a structural basis for the acquisition of additional functions by partitivirus coat proteins that enables mutualistic relationships with diverse plant hosts. Byrne et al determine the structure of Pepper cryptic virus 1 by Cryo-EM. They identify a disordered region that forms the outermost portion of the deltapartitivirus capsid protrusion that is characteristic of the plant-specific genus.
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期刊: NATURE STRUCTURAL BIOLOGY
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