Twisted or shifted? Fluorescence measurements of late intermediates in transcription initiation by T7 RNA polymerase.

Twisted or shifted? Fluorescence measurements of late intermediates in transcription initiation by T7 RNA polymerase.
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扭曲或移位?

DOI:
10.1021/bi700058b
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发表时间:
2007
期刊:
影响因子:
2.9
通讯作者:
Martin,CraigT
Martin,CraigT
中科院分区:
生物学3区
文献类型:
--
作者:
Turingan,RosemaryS;Theis,Karsten;Martin,CraigT

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T7RNA聚合酶在从起始到延伸的转变过程中经历了戏剧性的结构重排。对于过渡后期的启动子结合中间体,已经提出了两种模型。(I)通过完成蛋白质构象(扭转)变化来维持启动子相互作用的子集,以及(Ii)所有启动子结合元件从生长的DNADNARNA杂交物中协同移动(移位)导致开放的中间体,大规模的结构域旋转推迟到启动子释放之后。荧光共振能量转移测量为后者提供了非常有力的支持。
T7 RNA polymerase undergoes dramatic structural rearrangements in the transition from initiation to elongation. Two models have been proposed for promoter-bound intermediates late in the transition. (i) A subset of promoter interactions are maintained through completion of the protein conformational (twist) change, and (ii) concerted movement (shift) of all promoter-binding elements away from the growing DNA−RNA hybrid leads to an open intermediate, with large-scale domain rotations deferred until after promoter release. Fluorescence resonance energy transfer measurements provide very strong support for the latter.
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