The initiation factor TFE and the elongation factor Spt4/5 compete for the RNAP clamp during transcription initiation and elongation.

The initiation factor TFE and the elongation factor Spt4/5 compete for the RNAP clamp during transcription initiation and elongation.
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DOI:
10.1016/j.molcel.2011.05.030
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发表时间:
2011-07-22
期刊:
影响因子:
16
通讯作者:
Werner, Finn
Werner, Finn
中科院分区:
生物学1区
文献类型:
--
作者:
Grohmann, Dina;Nagy, Julia;Chakraborty, Anirban;Klose, Daniel;Fielden, Daniel;Ebright, Richard H.;Michaelis, Jens;Werner, Finn

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TFIIE和古细菌同源物TFE在转录起始过程中以一种未知的机制增强真核RNAPII和古细菌RNAP的DNA链分离。我们开发了一种荧光标记的重组M. jannaschii RNAP系统,用于探测由启动子DNA、TBP、TFB、TFE和RNAP组成的古菌转录起始复合物。我们利用单分子FRET定位了TFE翼螺旋结构域(WH)和锌带结构域(ZR)在RNAP上的位置。TFE WH结构域与转录延伸因子Spt4/5的相互作用位点重叠,两个因子相互竞争RNAP结合。在没有TFE的情况下,Spt4/5与RNAP的结合抑制了启动子定向转录,通过取代Spt4/5与RNAP的结合减轻了这种影响。在延伸过程中,Spt4/5可以取代RNAP延伸复合物中的TFE并刺激加工能力。我们的研究结果确定了RNAP“箝位”区域是转录起始和转录延伸的调控热点。►延伸因子Spt4/5可以抑制PIC的形成和转录启动►TFE有效地阻止了Spt4/5对转录启动的抑制►Spt4/5取代了TEC中的TFE
TFIIE and the archaeal homolog TFE enhance DNA strand separation of eukaryotic RNAPII and the archaeal RNAP during transcription initiation by an unknown mechanism. We have developed a fluorescently labeled recombinant M. jannaschii RNAP system to probe the archaeal transcription initiation complex, consisting of promoter DNA, TBP, TFB, TFE, and RNAP. We have localized the position of the TFE winged helix (WH) and Zinc ribbon (ZR) domains on the RNAP using single-molecule FRET. The interaction sites of the TFE WH domain and the transcription elongation factor Spt4/5 overlap, and both factors compete for RNAP binding. Binding of Spt4/5 to RNAP represses promoter-directed transcription in the absence of TFE, which alleviates this effect by displacing Spt4/5 from RNAP. During elongation, Spt4/5 can displace TFE from the RNAP elongation complex and stimulate processivity. Our results identify the RNAP “clamp” region as a regulatory hot spot for both transcription initiation and transcription elongation. ► The RNAP clamp coiled coil and RNAP stalk are required for TFE binding and activity ► The elongation factor Spt4/5 can inhibit PIC formation and transcription initiation ► TFE efficiently prevents inhibition of transcription initiation by Spt4/5 ► Spt4/5 displaces TFE from the TEC
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