ミリ秒解像度で環状ATPアゼモーターによる基板転位のメカニズム
1Center for Biophysics and Computational Biology and Beckman Institute for Advanced Science and Technology and ‡Department of Physics, University of Illinois at Urbana-Champaign , Urbana, Illinois 61801, United States.
Journal of the American Chemical Society
|February 4, 2015
まとめ
Rho因子モーターは,ATPの水解を用いてRNAを移動させ,産物放出と構造変化によって引き起こされる. これは,環状のATPアゼモーターの原子レベルのメカニズムを明らかにします.
科学分野:
- バイオケミストリー バイオケミストリー
- 分子生物学は分子生物学である.
- 構造生物学 構造生物学とは
背景:
- 環状のヘクサアメリカンATPアゼモーターは,DNA複製やタンパク質分解などの細胞プロセスに不可欠です.
- ATPの水解による基板転位の仕組みを理解することは,依然として課題です.
研究 の 目的:
- Rho因子によるmRNAトランスロケーションの原子レベルのメカニズムを明らかにするために,ホモヘクスアメリカンモーター.
- ATPの水解から機械的な力生成へのエネルギー伝達の特徴を述べる.
主な方法:
- 全原子分子ダイナミクスシミュレーション.
- 先進的な経路サンプリング技術.
- マイルストーニング分析.
主要な成果:
- 製品放出 (ADP + Pi) は,0.1 msのコンフォメーショントランジションを経由して,Rhoの力生成プロセスを誘発する.
- RNAの転位は,Rhoの構成状態の集団のシフトによって起こります.
- K326の6つのサイドチェーンがRNAを2つの新しい中間状態に引っ張ります.
結論:
- この研究は,協調されたサブユニット運動を含むRho媒介RNA転位の詳細なメカニズムを明らかにしています.
- それは,運動行動を調整する際に,水解反応剤と産物状態の役割を強調しています.
- このアプローチは,マルチメリック酵素におけるアロステリック部位を特定することができます.
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