Structure of native and expanded sobemoviruses by electron cryo-microscopy and image reconstruction.

Structure of native and expanded sobemoviruses by electron cryo-microscopy and image reconstruction.
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通过电子冷冻显微镜和图像重建分析天然和扩增的 sobemovirus 的结构。

DOI:
10.1006/jmbi.2000.4043
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发表时间:
2000
期刊:
Journal of molecular biology.
影响因子:
--
通讯作者:
Yeager,M
Yeager,M
中科院分区:
--
文献类型:
--
作者:
Opalka,N;Tihova,M;Brugidou,C;Kumar,A;Beachy,RN;Fauquet,CM;Yeager,M

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水稻黄斑驳病毒(RYMV)和南方菜豆花叶病毒豇豆株系(SCPMV)均属于Sobemovirus属的含RNA病毒。我们使用电子冷冻显微镜(cryo-EM)和二十面体图像分析,以25 μ m的分辨率检查这两种病毒的天然结构。这两种病毒都有一个紧密堆积的衣壳层,其中有180个亚基组装在T=3的二十面体晶格上。独特的冠状五聚体来自12个5重对称轴。SCPMV的外表面在2重轴上沿着有深的谷,在准3重轴上有突起。虽然具有相似的地形,但RYMV的表面相对光滑。RYMV和SCPMV的衣壳层下有两个同心的密度壳,我们将其解释为基因组RNA的有序区域。在二价阳离子的存在下,SCPMV颗粒溶胀和断裂,而RYMV的膨胀形式是稳定的。我们以前提出,RYMV在木质部中的细胞间运动涉及从受感染细胞的孔膜螯合Ca 2+,从而稳定衣壳壳并允许RYMV通过不稳定的膜传播的途径。在这个模型的背景下,我们提出,RYMV的扩展形式是在体内组装的病毒体的中间体。
Rice yellow mottle virus (RYMV) and southern bean mosaic virus, cowpea strain (SCPMV) are members of the Sobemovirus genus of RNA-containing viruses. We used electron cryo-microscopy (cryo-EM) and icosahedral image analysis to examine the native structures of these two viruses at 25 Å resolution. Both viruses have a single tightly packed capsid layer with 180 subunits assembled on a T=3 icosahedral lattice. Distinctive crown-like pentamers emanate from the 12 5-fold axes of symmetry. The exterior face of SCPMV displays deep valleys along the 2-fold axes and protrusions at the quasi-3-fold axes. While having a similar topography, the surface of RYMV is comparatively smooth. Two concentric shells of density reside beneath the capsid layer of RYMV and SCPMV, which we interpret as ordered regions of genomic RNA. In the presence of divalent cations, SCPMV particles swell and fracture, whereas the expanded form of RYMV is stable. We previously proposed that the cell-to-cell movement of RYMV in xylem involves chelation of Ca2+from pit membranes of infected cells, thereby stabilizing the capsid shells and allowing a pathway for spread of RYMV through destabilized membranes. In the context of this model, we propose that the expanded form of RYMV is an intermediate in the in vivo assembly of virions.
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