Controlled interplay between trigger loop and Gre factor in the RNA polymerase active centre.

Controlled interplay between trigger loop and Gre factor in the RNA polymerase active centre.
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DOI:
10.1093/nar/gkq1359
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发表时间:
2011-05
影响因子:
14.9
通讯作者:
Zenkin N
Zenkin N
中科院分区:
生物学2区
文献类型:
--
作者:
Roghanian M;Yuzenkova Y;Zenkin N

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多亚单位RNA聚合酶(RNAP)的高度进行性转录可能会被误掺入或回溯事件中断,从而导致转录停滞或导致错误的转录本。回溯的/错结合的复合体可以通过转录本的水解来解决。在这里,我们证明,作为对误掺入和/或回溯的响应,RNAP活性中心的催化结构域,即触发环(TL),被转录因子GRE取代。这种取代关闭了RNAP活性中心固有的依赖TL的水解性,并将其交换为一种更有效的依赖于Gre的RNA水解性机制。Tl被GRE因子取代只发生在回溯/错结合的络合物中,而不是在正确伸长的络合物中。RNAP活性的这种受控切换使延伸的加工性不受GRE的水解性的影响,同时确保有效的转录校对和可回溯的复合体的解析。
The highly processive transcription by multi-subunit RNA polymerases (RNAP) can be interrupted by misincorporation or backtracking events that may stall transcription or lead to erroneous transcripts. Backtracked/misincorporated complexes can be resolved via hydrolysis of the transcript. Here, we show that, in response to misincorporation and/or backtracking, the catalytic domain of RNAP active centre, the trigger loop (TL), is substituted by transcription factor Gre. This substitution turns off the intrinsic TL-dependent hydrolytic activity of RNAP active centre, and exchanges it to a far more efficient Gre-dependent mechanism of RNA hydrolysis. Replacement of the TL by Gre factor occurs only in backtracked/misincorporated complexes, and not in correctly elongating complexes. This controlled switching of RNAP activities allows the processivity of elongation to be unaffected by the hydrolytic activity of Gre, while ensuring efficient proofreading of transcription and resolution of backtracked complexes.
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