Interaction of the mediator head module with RNA polymerase II.

Interaction of the mediator head module with RNA polymerase II.
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DOI:
10.1016/j.str.2012.02.023
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发表时间:
2012-05-09
期刊:
影响因子:
5.7
通讯作者:
Asturias, Francisco J.
Asturias, Francisco J.
中科院分区:
生物学2区
文献类型:
--
作者:
Cai, Gang;Chaban, Yuriy L.;Imasaki, Tsuyoshi;Kovacs, Julio A.;Calero, Guillermo;Penczek, Pawel A.;Takagi, Yuichiro;Asturias, Francisco J.

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介体是整个真核生物中保守的大型(21个多肽,MW〜1 MDA)复合物,通过传达影响前产生复合物(PIC)活性的调节信号,在控制基因表达中起着至关重要的作用。但是,介体和RNA聚合酶II(RNAPII)之间的精确相互作用模式以及通过介体调节机理仍然难以捉摸。我们使用了冷冻电子显微镜并在体外转录测定中重构,以表征转录活性复合物,包括介体头模块和最小启动络合物的组件(RNAPII,TFIIF,TFIIB,TFIIB,TBP,TBP和启动子DNA)。我们的结果揭示了头部如何与RNAPII相互作用,从而影响其构象和功能。
Mediator, a large (21 polypeptides, MW ~1 MDa) complex conserved throughout eukaryotes, plays an essential role in control of gene expression by conveying regulatory signals that influence the activity of the preinitiation complex (PIC). However, the precise mode of interaction between Mediator and RNA polymerase II (RNAPII), and the mechanism of regulation by Mediator remain elusive. We used cryo-electron microscopy and reconstituted in vitro transcription assays to characterize a transcriptionally-active complex including the Mediator Head module and components of a minimum pre-initiation complex (RNAPII, TFIIF, TFIIB, TBP, and promoter DNA). Our results reveal how the Head interacts with RNAPII, affecting its conformation and function.
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