遺伝子毒性刺激に対する反応として,キナーゼATMとNF-kappaBのシグナル伝達との分子結合
Zhao-Hui Wu1, Yuling Shi, Randal S Tibbetts
1Department of Pharmacology, University of Wisconsin-Madison, 301 SMI, 1300 University Avenue, Madison, WI 53706, USA.
まとめ
NF-kappaBエッセンシャルモジュレーター (NEMO) タンパク質は,ATMとIKKの信号伝達経路をリンクしています. この相互作用は,DNA損傷に対する反応としてNF-kappaBを活性化し,細胞死経路に影響を与えます.
科学分野:
- 分子生物学は分子生物学である.
- 細胞シグナル伝達 細胞信号伝達
- DNAダメージレスポンス (DNAダメージレスポンス) とは
背景:
- 転写因子NF-kappaBは,遺伝子毒性ストレスに対するアポプトシス反応を調節する上で重要な役割を果たします.
- NF-kappaBのシグナル伝達は,NF-kappaBエッセンシャルモデュレーター (NEMO) サブユニットを含むIkappaBキナーゼ (IKK) 複合体によって厳しく調節されます.
研究 の 目的:
- 遺伝子毒性ストレスがNF-kappaB.B.を活性化する分子メカニズムを解明する.
- NEMOとNF-kappaBの活性化の調節におけるアタクシア・テランジエクタシア・ミューテッド (ATM) キナーゼの役割を調査する.
主な方法:
- コイムノプレシピテーションは,ATM,NEMO,IKKの間のタンパク質対タンパク質相互作用を研究するアッセイである.
- ウェスタン・ブロッティングは,NEMOのリン酸化とユビキチネーションを検出する.
- 免疫光顕微鏡で,ATMとNEMOの細胞下部位を追跡する.
主要な成果:
- 活性化されたATMキナーゼは,DNA二重鎖の断裂後にNEMOと関連付けられます.
- ATMは,NEMOのセリン-85をリン酸化し,その核輸出を促進しています.
- NEMOは,ELKSタンパク質を巻き込み,ATMによるIKKの細胞質転移と活性化を容易にする.
結論:
- NEMOの規制された核シャトリングは,ATMとIKKのシグナル伝達経路を結びつける重要なイベントです.
- このNEMOに依存するメカニズムは,遺伝子毒性信号に反応してNF-kappaBを活性化し,細胞の運命に影響を与えます.
- この発見は,DNA損傷反応とNF-kappaB活性化の複雑なネットワークに関する新しい洞察を提供します.
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