The RNA polymerase clamp interconverts dynamically among three states and is stabilized in a partly closed state by ppGpp
The RNA polymerase clamp interconverts dynamically among three states and is stabilized in a partly closed state by ppGpp
复制标题
RNA 聚合酶夹在三种状态之间动态地相互转换,并通过 ppGpp 稳定在部分闭合状态
DOI:
10.1101/278838
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发表时间:
2018
期刊:
影响因子:
--
通讯作者:
Duchi D
中科院分区:
文献类型:
--
作者:
Duchi D
RNA polymerase (RNAP) contains a mobile structural module, the ‘clamp,’ that forms one wall of the RNAP active-center cleft and that has been linked to crucial aspects of the transcription cycle, including promoter melting, transcription elongation complex stability, transcription pausing, and transcription termination. Using single-molecule FRET on surface-immobilized RNAP molecules, we show that the clamp in RNAP holoenzyme populates three distinct conformational states and interconvert between these states on the 0.1–1 s time-scale. Similar studies confirm that the RNAP clamp is closed in open complex (RPO) and in initial transcribing complexes (RPITC), including paused initial transcribing complexes, and show that, in these complexes, the clamp does not exhibit dynamic behaviour. We also show that, the stringent-response alarmone ppGpp, which reprograms transcription during amino acid starvation stress, selectively stabilizes the partly-closed-clamp state and prevents clamp opening; these results raise the possibility that ppGpp controls promoter opening by modulating clamp dynamics.
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影响因子:
16
作者:
Zuo Y;Steitz TA
通讯作者:
Steitz TA
影响因子:
16.6
作者:
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通讯作者:
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DOI:
10.1101/188680
发表时间:
2017
期刊:
bioRxiv
影响因子:
--
作者:
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通讯作者:
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16
作者:
Ross W;Sanchez-Vazquez P;Chen AY;Lee JH;Burgos HL;Gourse RL
通讯作者:
Gourse RL
DOI:
10.1073/pnas.96.3.893
发表时间:
1999-02-02
影响因子:
11.1
作者:
Ha, TJ;Ting, AY;Weiss, S
通讯作者:
Weiss, S