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Getting a grip on the terminator

机译:抓住终结者

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In bacteria, regulation of transcriptional termination is carried out by two general mechanisms: intrinsic and factor-dependent termination. In factor-dependent termination, a molecular machine called Rho loads onto the nascent RNA and mechanically forces the RNA polymerase (RNAP) elongation complex (EC) to dissociate. Rho termination factor is a homohexameric toroidal protein complex that couples the energy of ATP binding and hydrolysis to translocation in the 5'->3' direction along nascent RNA transcripts. Since the discovery of Rho-dependent termination in the late 1960s, a combination of biochemical and structural analyses has provided a detailed, albeit incomplete, view of the molecular mechanism of the Rho termination factor. Structural analysis of Rho by electron microscopy and X-ray crystallography has provided strong evidence that the Rho hexamer can exist in two general conformational states: an open oligomeric form resembling a lock washer and a topologically closed ring structure.
机译:在细菌中,转录终止的调控是通过两种通用机制进行的:内源性和因子依赖性终止。在因子依赖性终止中,称为Rho的分子机器加载到新生的RNA上,并机械地迫使RNA聚合酶(RNAP)延伸复合物(EC)解离。 Rho终止因子是一种同型六聚体环状蛋白复合物,它使ATP结合和水解的能量与沿着新生RNA转录本在5'-> 3'方向上的转运耦合。自从1960年代后期发现Rho依赖终止基团以来,生物化学和结构分析相结合,为Rho终止因子的分子机制提供了详细的(尽管不完整)观点。通过电子显微镜和X射线晶体学对Rho进行结构分析,提供了强有力的证据,证明Rho六聚体可以两种一般的构象状态存在:类似于锁紧垫圈的开放低聚形式和拓扑封闭的环结构。

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