ステップスキャンのFTIRスペクトロスコーピーによって明らかにされた,フィトクローム光周期中の染色体-タンパク質相互作用
Janne A Ihalainen1, Emil Gustavsson2, Lea Schroeder3
1Nanoscience Center, Department of Biological and Environmental Science , University of Jyväskylä , Jyväskylä 40014 , Finland.
Journal of the American Chemical Society
|September 6, 2018
まとめ
フィトクロームタンパク質
科学分野:
- 生物化学
- 分子生物学
- スペクトロスコーピー
背景:
- 植物と微生物の光に対する反応を調節する重要な光受容体である.
- ビリヴェルディン染色体による光の吸収は,タンパク質の構造の変化を通じてシグナルキャスケードを開始します.
- フィトクローム信号伝導の正確な分子メカニズムは,まだ完全に理解されていません.
研究 の 目的:
- 光活性化過程におけるバクテリアフィトクロームの動的構造変化を解明する.
- 植物染色体における信号伝導の分子基礎を理解する.
主な方法:
- Deinococcus radiodurans bacteriophytochromeに適用された2色ステップスキャンの赤外線スペクトロスコーピー
- イソトープの標識 (H2OとD2O) は,水素結合の動態を追跡する.
- 分子ダイナミクスのシミュレーションは,スペクトル学的データを補完します.
主要な成果:
- Lumi-R 中間物質のビリヴェルディンD環カルボニルと乱れた水素結合で,Meta-Rで完全に分離し,Pfrで再構成される.
- メタ-RからPfrへの移行中に確認された保存されたPHY舌の領域の再折り.
- Lumi-Rではマイクロ秒で早期のタンパク質の骨格の変化が検出されました.
- 保存された塩の橋はLumi-Rで壊れ,アルジニンはD環C=Oと相互作用する.
結論:
- この研究は,光活性化中に染色体周辺の水素結合の段階的な破壊と再構成を明らかにしている.
- 保存されたPHY舌の折り替えは,最終的なシグナル状態の移行に関連しています.
- この発見は,染色体イソメリゼーションとグローバルなタンパク質構造の変化の関連性について分子的な説明を提供し,植物染色体機構の理解を進めている.
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