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A Novel Open-Barrel Structure of Octameric Translin Reveals a Potential RNA Entryway

机译:八聚体蛋白的新型开桶结构揭示了潜在的RNA入口。

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The single-stranded DNA (ssDNA)/RNA binding protein translin was suggested to be involved in chromosomal translocations, telomere metabolism, and mRNA transport and translation. Oligonucleotide binding surfaces map within a closed cavity of translin octameric barrels, raising the question as to how DNA/RNA gain access to this inner cavity, particularly given that, to date, none of the barrel structures reported hint to an entryway. Here, we argue against a mechanism by which translin octamers may "dissociate and reassemble" upon RNA binding and report a novel "open"-barrel structure of human translin revealing a feasible DNA/RNA entryway into the cavity. Additionally, we report that translin not only is confined to binding of ssDNA oligonucleotides, or single-stranded extensions of double-stranded DNA (dsDNA), but also can bind single-stranded sequences internally embedded in dsDNA molecules. (C) 2014 Elsevier Ltd. All rights reserved.
机译:建议单链DNA(ssDNA)/ RNA结合蛋白翻译蛋白参与染色体易位,端粒代谢以及mRNA运输和翻译。寡核苷酸结合表面在translin八聚体桶的封闭腔内作图,这引发了关于DNA / RNA如何进入该内部腔的问题,特别是考虑到迄今为止,据报道,没有任何桶结构提示进入通道。在这里,我们反对一种机制,即跨膜蛋白八聚体可能在RNA结合后“解离并重新组装”,并报道人跨膜蛋白的新型“开放式”桶状结构,揭示了可行的DNA / RNA进入腔的途径。此外,我们报告说,转蛋白不仅限于结合ssDNA寡核苷酸或双链DNA(dsDNA)的单链延伸,而且还可以结合dsDNA分子内部嵌入的单链序列。 (C)2014 Elsevier Ltd.保留所有权利。

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