Complete architecture of the archaeal RNA polymerase open complex from single-molecule FRET and NPS.
Complete architecture of the archaeal RNA polymerase open complex from single-molecule FRET and NPS.
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DOI:
10.1038/ncomms7161
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发表时间:
2015-01-30
影响因子:
16.6
通讯作者:
Michaelis J
中科院分区:
文献类型:
--
作者:
Nagy J;Grohmann D;Cheung AC;Schulz S;Smollett K;Werner F;Michaelis J
The molecular architecture of RNAPII-like transcription initiation complexes has been studied for years but its structure has remained opaque due to its conformational flexibility and size. We determined the three-dimensional architecture of the complete open complex (OC) composed of the promoter DNA, TATA box-binding protein (TBP), transcription factors TFB and TFE, and the 12-subunit RNA polymerase (RNAP) from M. jannaschii. By combining single-molecule Förster resonance energy transfer (smFRET) and the Bayesian parameter estimation based Nano-Positioning System (NPS) analysis, we modelled the entire archaeal OC, which elucidates the path of the ntDNA strand and interaction sites of the transcription factors with the RNAP. Compared to models of the eukaryotic OC, the position of the TATA DNA region with TBP and TFB is positioned closer to the surface of the RNAP, likely providing the mechanism by which DNA melting can occur in a minimal factor configuration, without the dedicated translocase/helicase encoding factor TFIIH.
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