6XII

Escherichia coli transcription-translation complex B (TTC-B) containing an 24 nt long mRNA spacer, NusG, and fMet-tRNAs at E-site and P-site

これはPDB形式変換不可エントリーです。

6XII の概要

• エントリーDOI: 10.2210/pdb6xii/pdb
• EMDBエントリー: 22192
• 分子名称: 50S ribosomal protein L21, E-site and P-site tRNA (fMet), DNA-directed RNA polymerase subunit beta, ... (67 entities in total)
• 機能のキーワード: transcription-translation complex, transcription/translation
• 由来する生物種: Escherichia coli; 詳細
• タンパク質・核酸の鎖数: 67
• 化学式量合計: 2740433.73

構造登録者

Molodtsov, V.,Wang, C.,Su, M.,Ebright, R.H. (登録日: 2020-06-20, 公開日: 2020-09-02, 最終更新日: 2024-10-16)

主引用文献

Wang, C.,Molodtsov, V.,Firlar, E.,Kaelber, J.T.,Blaha, G.,Su, M.,Ebright, R.H.
Structural basis of transcription-translation coupling.
Science, 369:1359-1365, 2020

PubMed Abstract: In bacteria, transcription and translation are coupled processes in which the movement of RNA polymerase (RNAP)-synthesizing messenger RNA (mRNA) is coordinated with the movement of the first ribosome-translating mRNA. Coupling is modulated by the transcription factors NusG (which is thought to bridge RNAP and the ribosome) and NusA. Here, we report cryo-electron microscopy structures of transcription-translation complexes (TTCs) containing different-length mRNA spacers between RNAP and the ribosome active-center P site. Structures of TTCs containing short spacers show a state incompatible with NusG bridging and NusA binding (TTC-A, previously termed "expressome"). Structures of TTCs containing longer spacers reveal a new state compatible with NusG bridging and NusA binding (TTC-B) and reveal how NusG bridges and NusA binds. We propose that TTC-B mediates NusG- and NusA-dependent transcription-translation coupling.

PubMed: 32820061
DOI: 10.1126/science.abb5317

実験手法

ELECTRON MICROSCOPY (7 Å)