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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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
中科院分区:
文献类型:
--
作者:
Turingan,RosemaryS;Theis,Karsten;Martin,CraigT
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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