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Binding and translocation of termination factor Rho studied at the single-molecule level

机译:在单分子水平研究终止因子Rho的结合和转运

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Rho termination factor is an essential hexameric helicase responsible for terminating 20-50% of all mRNA synthesis in Escherichia coli. We used single-molecule force spectroscopy to investigate Rho-RNA binding interactions at the Rho utilization site of the a;tR1 terminator. Our results are consistent with Rho complexes adopting two states: one that binds 57±2nt of RNA across all sixofthe Rho primary binding sites,and another that binds 85±2nt at the six primary sites plus a single secondary site situated at the center of the hexamer. The single-molecule data serve to establish that Rho translocates 5′→3′ toward RNA polymerase (RNAP) by a tethered-tracking mechanism, looping out the intervening RNA between the Rho utilization site and RNAP. These findings lead to a general model for Rho binding and translocation and establish a novel experimental approach that should facilitate additional single-molecule studies of RNA-binding proteins.
机译:Rho终止因子是必需的六聚解旋酶,其负责终止大肠杆菌中所有mRNA合成的20-50%。我们使用单分子力谱研究在a; tR1终止子的Rho利用位点的Rho-RNA结合相互作用。我们的结果与采用两种状态的Rho络合物一致:一种状态跨所有Rho初级结合位点的全部六个结合57±2nt的RNA,另一种状态在六个初级位点加上位于其中心的单个二级位点结合85±2nt。六聚体。单分子数据用于确定Rho通过束缚跟踪机制向RNA聚合酶(RNAP)转移5'→3',从而在Rho利用位点和RNAP之间产生了介入的RNA。这些发现导致了Rho结合和易位的通用模型,并建立了一种新颖的实验方法,该方法应有助于RNA结合蛋白的其他单分子研究。

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