Conservative transcription in three steps visualized in a double-stranded RNA virus.

Conservative transcription in three steps visualized in a double-stranded RNA virus.
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双链 RNA 病毒中保守转录的三步可视化

DOI:
10.1038/s41594-019-0320-0
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发表时间:
2019-11
影响因子:
16.8
通讯作者:
Zhou ZH
Zhou ZH
中科院分区:
生物学1区
文献类型:
--
作者:
Cui Y;Zhang Y;Zhou K;Sun J;Zhou ZH

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内源性RNA转录是呼肠孤病毒科中双链RNA(dsRNA)病毒的特征,呼肠孤病毒科以其简单的单壳成员胞质多角体病毒(CPV)为例。由于在转录过程中缺乏RNA依赖性RNA聚合酶(RdRp)的中间阶段的原位结构,人们对RdRp如何检测环境线索和内部转录状态以启动和协调衣壳内转录物产生的重复循环知之甚少。在这里,我们捕获了五个高分辨率(2.8-3.5 μ m)的RdRp-RNA原位结构-代表静止,启动,早期延伸,延伸和流产状态-在7个实验条件下的CPV。我们观察到在起始状态下的“Y”型初始RNA叉和在延伸状态下的完整转录泡。这些结构表明,从头RNA转录涉及三个主要的构象变化,在状态转换。我们的研究结果支持内源性保守转录dsRNA病毒的大毒蛇模型。
Endogenous RNA transcription characterizes double-stranded RNA (dsRNA) viruses in theReoviridae, a family that is exemplified by its simple, single-shelled member cytoplasmic polyhedrosis virus (CPV). Because of the lack of in situ structures of the intermediate stages of RNA-dependent RNA polymerase (RdRp) during transcription, it is poorly understood how RdRp detects environmental cues and internal transcriptional states to initiate and coordinate repeated cycles of transcript production inside the capsid. Here, we captured five high-resolution (2.8–3.5 Å) RdRp–RNA in situ structures—representing quiescent, initiation, early elongation, elongation and abortive states—under seven experimental conditions of CPV. We observed the ‘Y’-form initial RNA fork in the initiation state and the complete transcription bubble in the elongation state. These structures reveal that de novo RNA transcription involves three major conformational changes during state transitions. Our results support an ouroboros model for endogenous conservative transcription in dsRNA viruses.
DOI: 10.1099/0022-1317-83-6-1477
发表时间: 2002-06-01
影响因子: 3.8
作者:
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通讯作者: Carner, GR
DOI: 10.1038/nmeth.2727
发表时间: 2014-01
期刊: NATURE METHODS
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DOI: 10.1073/pnas.75.3.1086
发表时间: 1978-01-01
影响因子: 11.1
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DOI: 10.1107/s0907444909052925
发表时间: 2010-02
期刊: Acta crystallographica. Section D, Biological crystallography
影响因子: --
作者:
Adams PD;Afonine PV;Bunkóczi G;Chen VB;Davis IW;Echols N;Headd JJ;Hung LW;Kapral GJ;Grosse-Kunstleve RW;McCoy AJ;Moriarty NW;Oeffner R;Read RJ;Richardson DC;Richardson JS;Terwilliger TC;Zwart PH
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