6RH3

Cryo-EM structure of E. coli RNA polymerase elongation complex bound to CTP substrate

6RH3 の概要

• エントリーDOI: 10.2210/pdb6rh3/pdb
• EMDBエントリー: 4882
• 分子名称: Non-template DNA, MAGNESIUM ION, Template DNA, ... (10 entities in total)
• 機能のキーワード: e. coli rna polymerase, ctp, greb, elongation complex, transcription
• 由来する生物種: Escherichia coli K-12; 詳細
• タンパク質・核酸の鎖数: 8
• 化学式量合計: 416697.75

構造登録者

Abdelkareem, M.,Saint-Andre, C.,Takacs, M.,Papai, G.,Crucifix, C.,Guo, X.,Ortiz, J.,Weixlbaumer, A. (登録日: 2019-04-18, 公開日: 2019-07-03, 最終更新日: 2024-05-22)

主引用文献

Abdelkareem, M.,Saint-Andre, C.,Takacs, M.,Papai, G.,Crucifix, C.,Guo, X.,Ortiz, J.,Weixlbaumer, A.
Structural Basis of Transcription: RNA Polymerase Backtracking and Its Reactivation.
Mol.Cell, 75:298-309.e4, 2019

PubMed Abstract: Regulatory sequences or erroneous incorporations during DNA transcription cause RNA polymerase backtracking and inactivation in all kingdoms of life. Reactivation requires RNA transcript cleavage. Essential transcription factors (GreA and GreB, or TFIIS) accelerate this reaction. We report four cryo-EM reconstructions of Escherichia coli RNA polymerase representing the entire reaction pathway: (1) a backtracked complex; a backtracked complex with GreB (2) before and (3) after RNA cleavage; and (4) a reactivated, substrate-bound complex with GreB before RNA extension. Compared with eukaryotes, the backtracked RNA adopts a different conformation. RNA polymerase conformational changes cause distinct GreB states: a fully engaged GreB before cleavage; a disengaged GreB after cleavage; and a dislodged, loosely bound GreB removed from the active site to allow RNA extension. These reconstructions provide insight into the catalytic mechanism and dynamics of RNA cleavage and extension and suggest how GreB targets backtracked complexes without interfering with canonical transcription.

PubMed: 31103420
DOI: 10.1016/j.molcel.2019.04.029

実験手法

ELECTRON MICROSCOPY (3.6 Å)