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首页> 外文期刊>Proceedings of the National Academy of Sciences of the United States of America >A small RNA acts as an antisilencer of the H-NS-silenced rcsA gene of Escherichia coli.
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A small RNA acts as an antisilencer of the H-NS-silenced rcsA gene of Escherichia coli.

机译:小RNA充当大肠杆菌H-NS沉默的rcsA基因的抗沉默剂。

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摘要

The regulation of capsular polysaccharide synthesis in Escherichia coli K-12 depends on the level of an unstable positive regulator, RcsA. The amount of RcsA protein is limited both by its rapid degradation by Lon, an ATP-dependent protease, and by its low level of synthesis. We have found that the low level of expression from the rcsA promoter is due to transcriptional silencing by the histone-like protein H-NS; this silencing is sensitive to both sequence and context in a region upstream of the -35 region of the promoter. A small (85-nt) RNA, DsrA, when overproduced, activates transcription of rcsA::lacZ fusions by counteracting H-NS silencing. DsrA RNA does not show any extended homology with the rcsA promoter or other sequenced regions of E. coli. Since the stimulation of rcsA transcription by this small RNA does not depend on any sequences from within the rcsA transcript, DsrA acts, either directly or indirectly, on rcsA transcription initiation.
机译:大肠杆菌K-12中荚膜多糖合成的调节取决于不稳定的阳性调节子RcsA的水平。 RcsA蛋白的量受Lon(一种依赖ATP的蛋白酶)快速降解以及其合成水平低的限制。我们发现rcsA启动子的低水平表达是由于组蛋白样蛋白H-NS的转录沉默所致。该沉默在启动子的-35区域上游的区域中对序列和背景均敏感。当过量产生时,小的(85-nt)RNA DsrA可通过抵消H-NS沉默来激活rcsA :: lacZ融合蛋白的转录。 DsrA RNA与rcsA启动子或大肠杆菌的其他测序区域未显示任何扩展的同源性。由于此小RNA对rcsA转录的刺激不依赖于rcsA转录物中的任何序列,因此DsrA直接或间接地作用于rcsA转录起始。

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