- PDB-6jny: Crystal structure of bacteriophage 21 Q protein -
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基本情報
登録情報
データベース: PDB / ID: 6jny
タイトル
Crystal structure of bacteriophage 21 Q protein
要素
Antiterminator Q protein
キーワード
TRANSCRIPTION / RNA polymerase / Antitermination
機能・相同性
Bacteriophage 933W, GpQ / Phage antitermination protein Q / negative regulation of termination of DNA-templated transcription / DNA binding / Antiterminator Q protein
ジャーナル: Nat Commun / 年: 2019 タイトル: Structural basis of Q-dependent transcription antitermination. 著者: Jing Shi / Xiang Gao / Tongguan Tian / Zhaoyang Yu / Bo Gao / Aijia Wen / Linlin You / Shenghai Chang / Xing Zhang / Yu Zhang / Yu Feng / 要旨: Bacteriophage Q protein engages σ-dependent paused RNA polymerase (RNAP) by binding to a DNA site embedded in late gene promoter and renders RNAP resistant to termination signals. Here, we report a ...Bacteriophage Q protein engages σ-dependent paused RNA polymerase (RNAP) by binding to a DNA site embedded in late gene promoter and renders RNAP resistant to termination signals. Here, we report a single-particle cryo-electron microscopy (cryo-EM) structure of an intact Q-engaged arrested complex. The structure reveals key interactions responsible for σ-dependent pause, Q engagement, and Q-mediated transcription antitermination. The structure shows that two Q protomers (Q and Q) bind to a direct-repeat DNA site and contact distinct elements of the RNA exit channel. Notably, Q forms a narrow ring inside the RNA exit channel and renders RNAP resistant to termination signals by prohibiting RNA hairpin formation in the RNA exit channel. Because the RNA exit channel is conserved among all multisubunit RNAPs, it is likely to serve as an important contact site for regulators that modify the elongation properties of RNAP in other organisms, as well.