Mfd Dynamically Regulates Transcription via a Release and Catch-Up Mechanism.
Mfd Dynamically Regulates Transcription via a Release and Catch-Up Mechanism.
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DOI:
10.1016/j.cell.2017.11.017
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发表时间:
2018-01-11
期刊:
影响因子:
64.5
通讯作者:
Wang MD
中科院分区:
文献类型:
--
作者:
Le TT;Yang Y;Tan C;Suhanovsky MM;Fulbright RM Jr;Inman JT;Li M;Lee J;Perelman S;Roberts JW;Deaconescu AM;Wang MD
The bacterial Mfd ATPase is increasingly recognized as a general transcription factor that participates in the resolution of transcription conflicts with other processes/roadblocks. This function stems from Mfd’s ability to preferentially act on stalled RNA polymerases (RNAPs). However, the mechanism underlying this preference and the subsequent coordination between Mfd and RNAP have remained elusive. Here, using a novel real-time translocase assay, we unexpectedly discovered that Mfd translocates autonomously on DNA. The speed and processivity of Mfd dictate a “release and catch-up” mechanism to efficiently patrol DNA for frequently stalled RNAPs. Furthermore, we showed that Mfd prevents RNAP backtracking or rescues a severely backtracked RNAP, allowing RNAP to overcome stronger obstacles. However, if an obstacle’s resistance is excessive, Mfd dissociates the RNAP, clearing the DNA for other processes. These findings demonstrate a remarkably delicate coordination between Mfd and RNAP, allowing efficient targeting and recycling of Mfd and expedient conflict resolution. A “release and catch-up” mechanism allows the bacterial protein Mfd to restart or remove stalled RNA polymerases
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影响因子:
10.8
作者:
Inman JT;Smith BY;Hall MA;Forties RA;Jin J;Sethna JP;Wang MD
通讯作者:
Wang MD
影响因子:
56.9
作者:
Brueckner, Florian;Hennecke, Ulrich;Cramer, Patrick
通讯作者:
Cramer, Patrick
DOI:
10.1073/pnas.1322350111
发表时间:
2014-03-18
影响因子:
11.1
作者:
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DOI:
10.1016/b978-0-12-387665-2.00001-8
发表时间:
2012
影响因子:
--
作者:
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通讯作者:
Van Houten, Bennett
影响因子:
5.6
作者:
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通讯作者:
Sonenshein, Abraham L.