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首页> 外文期刊>Journal of bacteriology >Growth rate-dependent control of the rrnB P1 core promoter in Escherichia coli.
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Growth rate-dependent control of the rrnB P1 core promoter in Escherichia coli.

机译:rrnB P1核心启动子在大肠杆菌中的生长速率依赖性控制。

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摘要

We have extended our previous studies of the DNA sequences required for growth rate-dependent control of rRNA transcription in Escherichia coli. Utilizing a reporter system suitable for evaluation of promoters with low activities, we have found that the core promoter region of rrnB P1 (-41 to +1 with respect to the transcription initiation site) is sufficient for growth rate-dependent control of transcription, both in the presence and in the absence of guanosine 3'-diphosphate 5'-diphosphate (ppGpp). The core promoter contains the -10 and -35 hexamers for recognition by the sigma 70 subunit of RNA polymerase but lacks the upstream (UP) element, which increases transcription by interacting with the alpha subunit of RNA polymerase. It also lacks the binding sites for the positive transcription factor FIS. Thus, the UP element, FIS, and ppGpp are not needed for growth rate-dependent regulation of rRNA transcription. In addition, we find that several core promoter mutations, including -10 and -35 hexamer substitutions, severely reduce rrnB P1 activity without affecting growth rate-dependent control. Thus, a high activity is not a determinant of growth rate regulation of rRNA transcription.
机译:我们已经扩展了以前的研究对大肠杆菌中rRNA转录的生长速率依赖性控制所必需的DNA序列。利用适用于评估低活性启动子的报告基因系统,我们发现rrnB P1的核心启动子区域(相对于转录起始位点为-41至+1)足以用于生长速率依赖性的转录控制,两者在存在和不存在鸟苷3'-二磷酸5'-二磷酸(ppGpp)的情况下。核心启动子包含-10和-35六聚体,可被RNA聚合酶的sigma 70亚基识别,但缺少上游(UP)元件,该元件通过与RNA聚合酶的α亚基相互作用而增加了转录。它还缺乏用于正转录因子FIS的结合位点。因此,rRNA转录的生长速率依赖性调节不需要UP元件,FIS和ppGpp。此外,我们发现几个核心启动子突变,包括-10和-35六聚体取代,严重降低了rrnB P1的活性,而不影响生长速率依赖性控制。因此,高活性不是rRNA转录生长速率调节的决定因素。

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