National Institutes of Health/National Center for Research Resources (NIH/NCRR)
米国
引用
ジャーナル: Cell / 年: 2023 タイトル: A trailing ribosome speeds up RNA polymerase at the expense of transcript fidelity via force and allostery. 著者: Liang Meng Wee / Alexander B Tong / Alfredo Jose Florez Ariza / Cristhian Cañari-Chumpitaz / Patricia Grob / Eva Nogales / Carlos J Bustamante / 要旨: In prokaryotes, translation can occur on mRNA that is being transcribed in a process called coupling. How the ribosome affects the RNA polymerase (RNAP) during coupling is not well understood. Here, ...In prokaryotes, translation can occur on mRNA that is being transcribed in a process called coupling. How the ribosome affects the RNA polymerase (RNAP) during coupling is not well understood. Here, we reconstituted the E. coli coupling system and demonstrated that the ribosome can prevent pausing and termination of RNAP and double the overall transcription rate at the expense of fidelity. Moreover, we monitored single RNAPs coupled to ribosomes and show that coupling increases the pause-free velocity of the polymerase and that a mechanical assisting force is sufficient to explain the majority of the effects of coupling. Also, by cryo-EM, we observed that RNAPs with a terminal mismatch adopt a backtracked conformation, while a coupled ribosome allosterically induces these polymerases toward a catalytically active anti-swiveled state. Finally, we demonstrate that prolonged RNAP pausing is detrimental to cell viability, which could be prevented by polymerase reactivation through a coupled ribosome.
ダウンロード / ファイル: emd_40178.map.gz / 形式: CCP4 / 大きさ: 325 MB / タイプ: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
注釈
Cryo-EM composited map of the E. coli Transcription-Translation Complex where RNAP adopts an anti-swiveled conformation
ボクセルのサイズ
X=Y=Z: 1.447 Å
密度
表面レベル
登録者による: 4.5
最小 - 最大
-32.1911 - 75.14211
平均 (標準偏差)
0.060853213 (±1.3078992)
対称性
空間群: 1
詳細
EMDB XML:
マップ形状
Axis order
Z
Y
X
Origin
0
0
0
サイズ
440
440
440
Spacing
440
440
440
セル
A=B=C: 636.68 Å α=β=γ: 90.0 °
-
添付データ
-
試料の構成要素
-
全体 : Cryo-EM composited map of the E. coli transcription-translation c...
全体
名称: Cryo-EM composited map of the E. coli transcription-translation complex (RNAP adopts an anti-swiveled conformation)
要素
複合体: Cryo-EM composited map of the E. coli transcription-translation complex (RNAP adopts an anti-swiveled conformation)
複合体: Cryo-EM structure of E. coli RNA polymerase Elongation complex in the Transcription-Translation Complex (RNAP in an anti-swiveled conformation)
複合体: Cryo-EM structure of E. coli 70S Ribosome containing mRNA and tRNA (in the transcription-translation complex)
-
超分子 #1: Cryo-EM composited map of the E. coli transcription-translation c...
超分子
名称: Cryo-EM composited map of the E. coli transcription-translation complex (RNAP adopts an anti-swiveled conformation) タイプ: complex / ID: 1 / キメラ: Yes / 親要素: 0
分子量
理論値: 2.9 MDa
-
超分子 #2: Cryo-EM structure of E. coli RNA polymerase Elongation complex in...
超分子
名称: Cryo-EM structure of E. coli RNA polymerase Elongation complex in the Transcription-Translation Complex (RNAP in an anti-swiveled conformation) タイプ: complex / ID: 2 / キメラ: Yes / 親要素: 1
由来(天然)
生物種: Escherichia coli (大腸菌)
分子量
理論値: 400 KDa
-
超分子 #3: Cryo-EM structure of E. coli 70S Ribosome containing mRNA and tRN...
超分子
名称: Cryo-EM structure of E. coli 70S Ribosome containing mRNA and tRNA (in the transcription-translation complex) タイプ: complex / ID: 3 / キメラ: Yes / 親要素: 1
解像度のタイプ: BY AUTHOR / 解像度: 3.8 Å / 解像度の算出法: FSC 0.143 CUT-OFF 詳細: This is a composited map. The resolution reported here is the one obtained only for one of the components of the map that was focus refined (see EMD-29214). 使用した粒子像数: 18000