An unusual topological structure of the HIV-1 Rev response element.

An unusual topological structure of the HIV-1 Rev response element.
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DOI:
10.1016/j.cell.2013.10.008
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发表时间:
2013-10-24
期刊:
影响因子:
64.5
通讯作者:
Wang YX
Wang YX
中科院分区:
生物学1区
文献类型:
--
作者:
Fang X;Wang J;O'Carroll IP;Mitchell M;Zuo X;Wang Y;Yu P;Liu Y;Rausch JW;Dyba MA;Kjems J;Schwieters CD;Seifert S;Winans RE;Watts NR;Stahl SJ;Wingfield PT;Byrd RA;Le Grice SF;Rein A;Wang YX

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未剪接和单剪接病毒mRNA的核输出是HIV生命周期中的关键步骤。病毒在更丰富的宿主细胞RNA中选择自己的mRNA进行输出的结构基础在25年多来一直是一个谜。在这里,我们描述了一种不寻常的拓扑结构,该病毒用于识别自己的mRNA。病毒Rev反应元件(RRE)采用“A”样结构,其中两条腿构成病毒Rev蛋白的两个结合位点轨道,并将两个主要的已知Rev结合位点定位在相距约55 nm处,与Rev二聚体中两个RNA结合基序之间的距离匹配。最佳RRE功能需要“A”的两条腿以及它们之间的分离。这种结构解释了Rev对RRE的特异性,从而解释了对病毒RNA的特异性识别。
Nuclear export of unspliced and singly spliced viral mRNA is a critical step in the HIV life cycle. The structural basis by which the virus selects its own mRNA among more abundant host cellular RNAs for export has been a mystery for more than 25 years. Here, we describe an unusual topological structure that the virus uses to recognize its own mRNA. The viral Rev response element (RRE) adopts an “A”-like structure in which the two legs constitute two tracks of binding sites for the viral Rev protein and position the two primary known Rev-binding sites ~55 Å apart, matching the distance between the two RNA-binding motifs in the Rev dimer. Both the legs of the “A” and the separation between them are required for optimal RRE function. This structure accounts for the specificity of Rev for the RRE and thus the specific recognition of the viral RNA.
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