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首页> 外文期刊>Proceedings of the National Academy of Sciences of the United States of America >A mutant RNA polymerase that forms unusual open promoter complexes
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A mutant RNA polymerase that forms unusual open promoter complexes

机译:形成异常的开放启动子复合体的突变RNA聚合酶

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摘要

We describe a mutant Escherichia coli RNA polymerase (RNAP) that forms stable open promoter com- plexes even at 20 deg C but with a shortened melted region that extends downstream to only position 7. In the presence of initiating transcription substrates, the mutant RNAP under- goes a temperature-dependent isomerization, resulting in a promoter complex that is indistinguishable from the wild-type RNAP-promoter complex, with the melted region extended downstream to position +4. We propose that the open complex formed by the mutant RNAP represents an intermediate on the normal promoter-opening pathway and that our results support earlier findings that initial promoter opening occurs in the upstream region of the 10 promoter consensus element and subsequently extends downstream to encompass the transcription start site.
机译:我们描述了一种突变的大肠杆菌RNA聚合酶(RNAP),即使在20摄氏度时也能形成稳定的开放启动子复合体,但其缩短的融化区域向下游延伸至第7位。在存在起始转录底物的情况下,该突变的RNAP -进行温度依赖性的异构化,产生与野生型RNAP-启动子复合物没有区别的启动子复合物,其熔融区域向下游延伸至位置+4。我们建议由突变RNAP形成的开放复合物代表正常启动子开放途径上的中间体,并且我们的研究结果支持较早的发现,即初始启动子开放发生在10个启动子共有元件的上游区域,并随后向下游延伸,以涵盖启动子。转录起始位点。

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