レドックス信号伝導:変異により,SoxRセンサー調節器の [2Fe-2S] センターが酸化形態にシフトする
1Department of Molecular and Cellular Toxicology, Harvard School of Public Health, Boston, Massachusetts 02115-6021, USA.
Cell
|January 10, 1997
まとめ
構成的に活性なSoxR (SoxRc) タンパク質は,新しい酸化還元調節を明らかにする. 鉄硫黄酸化状態は,プロモーターの活性化に直接結合し,酸化ストレス反応に関するインビトロおよびインビボの発見を結びつける.
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.
- 微生物学 微生物学とは
背景:
- SoxRは,酸化ストレスによって活性化される [2Fe-2S] 転写因子です.
- アクティベーションは,単電子酸化または鉄と硫黄のクラスターアセンブリを介してin vitroで発生します.
- SoxRの活性化のインビボメカニズムは不明のままである.
研究 の 目的:
- SoxRの活性化メカニズムをin vitroとin vivoで区別する.
- SoxR関数における鉄硫黄クラスター酸化状態の役割を調査する.
- SoxR.の新たな酸化還元調節を調査する.
主な方法:
- 無傷の [2Fe-2S] センターを持つ構成的に活性な SoxR (SoxRc) タンパク質を研究した.
- in vitroトランスクリプションアッセイを用いた.
- SoxRの酸化状態を評価するために,in vivoスペクトルスコピーを実行しました.
- SoxRcタンパク質の測定された酸化還元能力.
主要な成果:
- 野生型 SoxR のように SoxRc タンパク質は,化学的還元によって不活性化されました.
- In vivoでは,酸化ストレスなしでも,SoxRcタンパク質は,減少した [2Fe-2S] 状態で蓄積できませんでした.
- 1つのSoxRc変種は低酸化還元電位を示し,その酸化された活性化された形態を vivo で好みました.
結論:
- この研究は,SoxR調節に関する in vitroおよびin vivoの発見をリンクしています.
- 新規のリドックス調節法が,鉄硫黄クラスターの酸化状態をプロモーター活性化に結びつける.
- 酸化ストレス反応のメカニズムは,SoxRのリドックス反応を理解することによってさらに解明されます.
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