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ユカリオットの転写結合DNA修復を開始するための構造的基礎
Jun Xu1, Indrajit Lahiri2, Wei Wang1
1Division of Pharmaceutical Sciences, Skaggs School of Pharmacy & Pharmaceutical Sciences, University of California San Diego, La Jolla, California 92093, USA.
Nature
|November 24, 2017
まとめ
コケイン症候群群B (CSB) タンパク質である酵母中のRad26は,転写結合修復 (TCR) に不可欠である. その構造は,DNA修復と転写の延長を促進するためにRNAポリメラーゼIIとどのように相互作用するかを明らかにします.
科学分野:
- 分子生物学
- DNA 修復 メカニズム
- 構造生物学
背景:
- 転写結合修復 (TCR) は,RNAポリメラーゼII (PolII) を阻害するDNA病変を除去する.
- コケイン症候群のグループB (CSB) タンパク質 (酵母Rad26) は,TCR開始時に早期に停止したPolIIに徴用されます.
- CSBの変異は,プロゲロイドの特徴を持つ障害であるコケイン症候群を引き起こす.
研究 の 目的:
- ユカリオット TCR 発起の分子メカニズムを解明する.
- CSB/Rad26と逮捕されたPol IIのやり取りを理解するために
- Pol II-Rad26複合体の構造を解明する
主な方法:
- 電子冷凍顕微鏡 (cryo-EM) を用いて,Saccharomyces cerevisiae Pol II- Rad26複合体の構造を決定した.
- 複合体の構造分析
- Rad26の役割を評価する機能的測定法
主要な成果:
- Pol II-Rad26複合体の冷凍-EM構造が解明されました.
- Rad26はPol IIの上流にDNAを結合し その経路を変えます
- Rad26のSwi2 / Snf2ファミリーのATPアゼドメインはPol IIの動きを促進する.
結論:
- Rad26は,TCRの開始と転写の延長の両方で重要な役割を果たしています.
- 構造は,Rad26が停滞したPol IIとどのように相互作用するかについての洞察を提供します.
- この研究は,真核細胞のTCR開始のメカニズムを明らかにしている.
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