コレプレッサーとイノシトールテトラホスファートに結合するHDAC3の構造
Peter J Watson1, Louise Fairall, Guilherme M Santos
1Henry Wellcome Laboratories of Structural Biology, Department of Biochemistry, University of Leicester, Leicester LE1 9HN, UK.
Nature
|January 11, 2012
まとめ
ヒストン脱酸化酵素 (HDACs) は,重要ながん標的である. 研究者らは,イノシトールテトラホスファート分子が分子接着剤として作用し,HDAC3と遺伝子調節のための共同抑制剤複合体の形成を可能にすることを発見しました.
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.
- がん研究 がん研究
背景:
- ヒストン脱酸化酵素 (HDACs) は遺伝子発現を調節し,がん薬の主要標的である.
- クラスIのHDACは,酵素活性のためにしばしば共抑制剤複合体を必要とします.
- HDAC-co-repressorの相互作用を理解することは,標的がん治療の開発に不可欠です.
研究 の 目的:
- ヒトのHDAC3複合体の形成の構造的基礎を,SMRT共圧圧剤で解明する.
- HDAC3-SMRT複合体の組み立てを媒介する重要な分子相互作用を特定する.
- HDACの活性を調節する小さな分子の役割を調査する.
主な方法:
- 人間のHDAC3-SMRT複合体の構造を決定するX線結晶学.
- 複合体の形成がイノシトールテトラホスファートに依存するかどうかを評価するための生化学的分析.
- 重要な結合界面と分子相互作用を特定するための構造分析.
主要な成果:
- 構造は,複合体の形成時にSMRTデセチラゼ活性化ドメイン (DAD) の重要な構成変化を明らかにします.
- D-ミオイノシトール-1,4,5,6) -テトラキスホスファート (Ins-1,4,5,6) P4) は,HDAC3とSMRTの間の重要な分子間橋梁として作用する.
- 複合組成はIns{1,4,5,6) P4に非常に依存しており,その規制的な役割を示唆しています.
結論:
- Ins ((1,4,5,6) P4は,HDAC3-SMRT複合体の形成と活性化のための重要な媒介です.
- イノシトールテトラホスファートによるHDAC活性化のこのメカニズムは,種間で保存されています.
- この発見は,がんにおけるHDACを標的とした治療戦略の新たな道を開く.
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