FicDのTPRドメインの機能的動態は,ATPとBiPとの相互作用によって調節される
Svenja Runge1, Ecenaz Bilgen2, Andrea Magni3
1Department of Biochemistry and Signal Transduction, University Medical Center Hamburg-Eppendorf, Hamburg 20246, Germany.
まとめ
人間のFicD酵素は,AMPを可逆的に結合することによって,Hsp70 BiPのシャペロン活性を調節する. この研究は,FicD
科学分野:
- 分子生物学
- 生物化学
- 構造生物学
背景:
- ヒトのFic酵素FicDは,エンドプラズマ網内のHsp70ホモログBiPを調節する.
- FicDはAMPylationによってBiPの活性を調節し,シャペロン機能と基板親和性を減少させます.
- 結晶構造はFicDのテトラトリコペプチドリピート (TPR) モチーフの構成的変動を示しているが,ダイナミクスは不明である.
研究 の 目的:
- FicDのTPRモチーフの構造動態を調査する.
- これらのダイナミクスがATPとBiP結合によってどのように影響されるかを理解する.
- 制御機能とFicDのダイナミクスを相関させる
主な方法:
- 二色単一分子フォースター共振エネルギー伝達 (smFRET) 実験
- ダイナミック・フォトンの分布分析
- 分子力学シミュレーション
主要な成果:
- FicDのTPRモチーフは,TPRアウト状態とTPRイン状態 (マイクロ秒からミリ秒) の間の構成ダイナミクスを示す.
- TPRモチーフ内のラベリング位置によってコンフォメーションダイナミクスは異なります.
- ATPとBiPの結合は,動的状態の均衡と集団を変化させる.
結論:
- FicDは,そのTPRモチーフに重要な形状のダイナミクスを持っています.
- これらの動態はFicDの機能とBiPとの相互作用に関連しています.
- 構成的景観モデルは,FicDによるBiPのダイナミックな調節を説明する.
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