Spt4/5 stimulates transcription elongation through the RNA polymerase clamp coiled-coil motif.

Spt4/5 stimulates transcription elongation through the RNA polymerase clamp coiled-coil motif.
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DOI:
10.1093/nar/gkq135
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发表时间:
2010-07
影响因子:
14.9
通讯作者:
Werner F
Werner F
中科院分区:
生物学2区
文献类型:
--
作者:
Hirtreiter A;Damsma GE;Cheung AC;Klose D;Grohmann D;Vojnic E;Martin AC;Cramer P;Werner F

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Spt 5是唯一已知的RNA聚合酶相关因子,在生命的所有三个领域都是保守的。我们已经解决了的结构的甲烷球菌詹氏Spt 4/5复合物的X-射线晶体学,其特征在于它的功能和相互作用的古细菌RNAP在一个完全重组的体外转录系统。Spt 4和Spt 5形成一个稳定的复合物,与RNAP独立的延伸复合物的DNA-RNA支架。Spt 4/5与RNAP的关联导致在不存在和存在非模板链的情况下刺激转录持续性。结构域缺失分析揭示了Spt 4/5的分子解剖-Spt 5 Nus-G N-末端(NGN)结构域是复合物的效应结构域,其既介导与RNAP的相互作用,又对其延伸活性至关重要。使用诱变方法,我们已经确定了Spt 5 NGN结构域上的疏水口袋作为RNAP的结合位点,并将RNAP钳卷曲螺旋基序作为Spt 4/5的结合位点。
Spt5 is the only known RNA polymerase-associated factor that is conserved in all three domains of life. We have solved the structure of the Methanococcus jannaschii Spt4/5 complex by X-ray crystallography, and characterized its function and interaction with the archaeal RNAP in a wholly recombinant in vitro transcription system. Archaeal Spt4 and Spt5 form a stable complex that associates with RNAP independently of the DNA–RNA scaffold of the elongation complex. The association of Spt4/5 with RNAP results in a stimulation of transcription processivity, both in the absence and the presence of the non-template strand. A domain deletion analysis reveals the molecular anatomy of Spt4/5—the Spt5 Nus-G N-terminal (NGN) domain is the effector domain of the complex that both mediates the interaction with RNAP and is essential for its elongation activity. Using a mutagenesis approach, we have identified a hydrophobic pocket on the Spt5 NGN domain as binding site for RNAP, and reciprocally the RNAP clamp coiled-coil motif as binding site for Spt4/5.
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发表时间: 2009-08-01
影响因子: 4.1
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