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yexuqing木虫之王 (文学泰斗)
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Mechanism of membrane perforation in rotavirus cell entry
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Mechanism of membrane perforation in rotavirus cell entry 轮状病毒进入细胞时膜穿孔的机制 ▲ 作者:MARILINA DE SAUTU, CONNY LEISTNER, TOMAS KIRCHHAUSEN, SIMON JENNI, AND STEPHEN C. HARRISON ▲链接: https://www.science.org/doi/10.1126/science.aeg4851 ▲摘要: 无包膜动物病毒的细胞进入需要一个大分子组装体跨细胞膜易位。双链RNA病毒向靶细胞导入一个内部衣壳颗粒,该颗粒不会进一步脱壳。相反,它凭借其内部的聚合酶和加帽活性,将带帽的病毒mRNA挤出。 研究者利用冷冻电子断层扫描技术可视化了恒河猴轮状病毒进入的全过程,从细胞附着、病毒粒子摄取到亚病毒颗粒的释放。 冷冻断层图像以及对分类亚颗粒的亚断层平均,将病毒粒子及其组分的高分辨率结构与活细胞荧光显微镜的时间序列联系起来。研究概述了进入过程中的每一步相应机制,包括将亚病毒颗粒转移至胞质溶胶的膜穿孔步骤。 ▲ Abstract: Cell entry of nonenveloped animal viruses requires translocation of a macromolecular assembly across a cellular membrane. Double-stranded RNA viruses introduce into the target cell an inner capsid particle that does not uncoat further. Instead, it extrudes capped viral mRNA by virtue of polymerase and capping activities within it. As described here, we used cryogenic electron tomography to visualize the full course of rhesus rotavirus entry, from cell attachment and virion uptake to release of the subviral particle. The cryo-tomograms and subtomogram averaging of classified subparticles link high-resolution structures of the virion and its components with time series from live-cell fluorescence microscopy. We outline the mechanism of each step in th |
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