Crystal structures of the E. coli transcription initiation complexes with a complete bubble.

Crystal structures of the E. coli transcription initiation complexes with a complete bubble.
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大肠杆菌转录起始复合物的晶体结构具有完整的气泡。

DOI:
10.1016/j.molcel.2015.03.010
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发表时间:
2015-05-07
期刊:
影响因子:
16
通讯作者:
Steitz TA
Steitz TA
中科院分区:
生物学1区
文献类型:
--
作者:
Zuo Y;Steitz TA

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在转录起始期间,RNA聚合酶与启动子DNA结合以形成含有DNA泡的起始复合物,并在逃离启动子以过渡到进行性RNA合成的延伸期之前进入RNA合成的失败循环。本文报道了E.大肠杆菌转录起始复合物,含有完整的转录泡和从头合成的RNA寡核苷酸,分辨率约为6 μ m。这些结构显示了RNA聚合酶如何识别含有不同长度间隔区的DNA启动子,并揭示了新生RNA的5 '-三磷酸与σ因子之间的桥接相互作用,该因子可能在转录起始的早期阶段起稳定短RNA-DNA杂合体的作用。RNA寡核苷酸的构象和完整起始复合物中DNA链的路径提供了对控制流产和生产性RNA合成的机制的见解。
During transcription initiation, RNA polymerase binds to promoter DNA to form an initiation complex containing a DNA bubble and enters into abortive cycles of RNA synthesis before escaping the promoter to transit into the elongation phase for processive RNA synthesis. Here we present the crystal structures of E. coli transcription initiation complexes containing a complete transcription bubble and de novo synthesized RNA oligonucleotides at about 6 Å resolution. The structures show how RNA polymerase recognizes DNA promoters that contain spacers of different lengths and reveal a bridging interaction between the 5’-triphosphate of the nascent RNA and the σ factor that may function to stabilize the short RNA-DNA hybrids during the early stage of transcription initiation. The conformation of the RNA oligonucleotides and the paths of the DNA strands in the complete initiation complexes provide insights into the mechanism that controls both the abortive and productive RNA synthesis.
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