Structural basis of transcriptional pausing in bacteria.

Structural basis of transcriptional pausing in bacteria.
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DOI:
10.1016/j.cell.2012.12.020
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发表时间:
2013-01-31
期刊:
影响因子:
64.5
通讯作者:
Darst SA
Darst SA
中科院分区:
生物学1区
文献类型:
--
作者:
Weixlbaumer A;Leon K;Landick R;Darst SA

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多亚基RNA聚合酶(RNAP)的转录暂停是调节原核生物和真核生物基因表达的关键机制,是转录终止的先决条件。暂停和终止状态被认为是通过一个共同的,基本的暂停状态,这是抑制核苷酸添加。我们报告了Thermus RNAP元素暂停延伸复合物(ePEC)的三种晶体结构。这些结构揭示了ePEC中相同的松弛的、开钳RNAP构象,这可能是由于在易位过程中未能重建DNA接触而引起的。一个扭结的桥螺旋空间阻断RNAP活性位点,解释了这种构象如何抑制RNAP催化活性。我们的研究结果为理解RNA发夹形成如何稳定暂停状态以及ePEC中间体如何促进终止提供了一个框架。
Transcriptional pausing by multi-subunit RNA Polymerases (RNAPs) is a key mechanism for regulating gene expression in both prokaryotes and eukaryotes, and is a prerequisite for transcription termination. Pausing and termination states are thought to arise through a common, elemental pause state that is inhibitory for nucleotide addition. We report three crystal structures of Thermus RNAP elemental paused elongation complexes (ePECs). The structures reveal the same relaxed, open-clamp RNAP conformation in the ePEC that may arise by failure to reestablish DNA contacts during translocation. A kinked bridge-helix sterically blocks the RNAP active site, explaining how this conformation inhibits RNAP catalytic activity. Our results provide a framework for understanding how RNA hairpin formation stabilizes the paused state and how the ePEC intermediate facilitates termination.
DOI: 10.1002/bies.950180212
发表时间: 1996-02-01
期刊: BIOESSAYS
影响因子: 4
作者:
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