General stress response signalling: unwrapping transcription complexes by DNA relaxation via the sigma38 C-terminal domain.

General stress response signalling: unwrapping transcription complexes by DNA relaxation via the sigma38 C-terminal domain.
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DOI:
10.1111/j.1365-2958.2008.06412.x
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发表时间:
2008-10
影响因子:
3.6
通讯作者:
Gralla JD
Gralla JD
中科院分区:
生物学2区
文献类型:
--
作者:
Huo YX;Rosenthal AZ;Gralla JD

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大肠杆菌通过特殊和一般转录信号通路的组合来应对压力。一般途径通常需要主应力调节器sigma38 (rpoS)。在这里,我们发现来自多重应激的信号使DNA松弛是由sigma 38 c末端结构域(CTD)的一个非保守的8个氨基酸尾部处理的。相比之下,对积累谷氨酸钾的应激反应不依赖于这条短尾,但仍然需要整体CTD。体外转录和足迹研究表明,多重压力可以靶向一种稳定的RNA聚合酶,并通过将DNA从核小体样状态解开来激活它,使RNA聚合酶逃逸到生产模式。这种转变可以通过DNA松弛或谷氨酸钾积累来完成,这是许多压力的特征。
E. coli responds to stress by a combination of specific and general transcription signaling pathways. The general pathways typically require the master stress regulator sigma38 (rpoS). Here we show that the signaling from multiple stresses that relax DNA is processed by a non-conserved 8 amino acid tail of the sigma 38 C-terminal domain (CTD). By contrast, responses to stresses that accumulate potassium glutamate do not rely on this short tail, but still require the overall CTD. In vitro transcription and footprinting studies suggest that multiple stresses can target a poised RNA polymerase and activate it by unwrapping DNA from a nucleosome-like state, allowing the RNA polymerase to escape into productive mode. This transition can be accomplished by either the DNA relaxation or potassium glutamate accumulation that characterizes many stresses.
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发表时间: 2001-04-01
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