Reconstitution and structure of a bacterial Pnkp1-Rnl-Hen1 RNA repair complex.

Reconstitution and structure of a bacterial Pnkp1-Rnl-Hen1 RNA repair complex.
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DOI:
10.1038/ncomms7876
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发表时间:
2015-04-17
影响因子:
16.6
通讯作者:
Huang RH
Huang RH
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Wang P;Selvadurai K;Huang RH

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核糖毒素切割细胞杀伤所必需的RNA,而RNA修复则中和核糖毒素对细胞存活造成的损害。在这里,我们报告了一种新的细菌RNA修复复合物,它可以进行与免疫相关的RNA修复。这种新的RNA修复复合物是一种270 kDa的异源六聚体,由三种蛋白质Pnkp 1,Rn 1和Hen 1组成,它们是体外修复核糖毒素切割的RNA所必需的。该复合物的晶体结构揭示了作为Pnkp 1-Rnl-Hen 1异源三聚体在Pnkp 1二聚体界面处融合的两个菱形环结构的异源六聚体的分子结构。RNA修复所需的四个活性位点位于每个环的内缘。Pnkp 1-Rnl-Hen 1异六聚体的活性位点的结构和位置表明,在断裂的RNA末端发生了一系列有序的修复反应,从而对复发性损伤产生免疫力。 细菌核糖毒素靶向并切割参与翻译的RNA,靶生物抗性由RNA修复系统介导。在这里,Wang等人鉴定、报告了Pnkp 1-Rnl-Hen 1的晶体结构并表征了其活性,Pnkp 1-Rnl-Hen 1是来自牙龈二氧化碳嗜纤维菌的一种新型RNA修复复合物。
Ribotoxins cleave essential RNAs for cell killing, and RNA repair neutralizes the damage inflicted by ribotoxins for cell survival. Here we report a new bacterial RNA repair complex that performs RNA repair linked to immunity. This new RNA repair complex is a 270-kDa heterohexamer composed of three proteins—Pnkp1, Rnl and Hen1—that are required to repair ribotoxin-cleaved RNA in vitro. The crystal structure of the complex reveals the molecular architecture of the heterohexamer as two rhomboid-shaped ring structures of Pnkp1–Rnl–Hen1 heterotrimer fused at the Pnkp1 dimer interface. The four active sites required for RNA repair are located on the inner rim of each ring. The architecture and the locations of the active sites of the Pnkp1–Rnl–Hen1 heterohexamer suggest an ordered series of repair reactions at the broken RNA ends that confer immunity to recurrent damage. Bacterial ribotoxins target and cleave RNAs involved in translation, with target organism resistance being mediated by RNA repair systems. Here, Wang et al. identify, report the crystal structure, and characterize the activity of Pnkp1–Rnl–Hen1, a novel RNA repair complex from Capnocytophaga gingivalis.
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