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ピロプトーシスにおける自動処理カスパスによるGSDMD標的化のための構造的メカニズム
Kun Wang1, Qi Sun2, Xiu Zhong1
1Peking University-Tsinghua University-National Institute of Biological Sciences Joint Graduate Program, National Institute of Biological Sciences, 102206 Beijing, China; National Institute of Biological Sciences, Beijing, 102206 Beijing, China.
Cell
|February 29, 2020
まとめ
炎症体活性化カスパース (カスパース-1, -4, -11) はガスダーミンD (GSDMD) を割って,熱死を引き起こす. この研究は,活性化カスパース-4/11が GSDMD を結合するためにユニークな水害性インターフェースを使用し,熱死を引き起こし,新しい治療標的を提供することを明らかにしています.
科学分野:
- 分子生物学
- 免疫学
- 構造生物学
背景:
- ガスダーミンD (GSDMD) は,プログラム細胞死の一種である炎症性炎症性炎症性炎症性炎症性炎症性炎症性炎症性炎症性炎症性炎症性炎症性炎症性炎症性炎症性炎症性炎症性炎症性炎症性炎症性炎症性炎症性炎症性炎症性炎症性炎症性炎症性炎症性炎症性炎症性炎症性炎症性炎症性炎症性炎症性炎症性炎症性炎症性炎症性炎症性炎症性炎症性炎症性炎症性炎症性炎症性炎症性炎症性炎症性炎症性炎症性炎症性炎症性炎症性炎症性炎症性炎症性炎症性炎症性炎症性炎症性炎症性炎症性炎症性炎症性炎症性炎症性炎症性炎症性炎症性炎症性炎症性炎症性炎症性炎症性炎症性
- インフラマソームの活性化により,GSDMDのカスパース-1またはカスパース-11/4/5が分裂し,細胞解離が始まります.
- カスパスがGSDMDを認識する正確なメカニズムと,それがカスパスの活性化とどのように関係しているかは,ほとんど不明である.
研究 の 目的:
- 炎症体活性化カスパースによるGSDMD認識の分子メカニズムを解明する.
- カスパース媒介のGSDMD分裂と熱死誘導の構造的基礎を調査する.
- ピロプトス・カスパースの特定の阻害剤を開発するための潜在的な標的を特定する.
主な方法:
- カスパース-4/11のサイト固有の自動処理分析
- カスパース-4/11-GSDMD-Cおよびカスパース-1-GSDMD-C複合体の共結晶化および構造的決定.
- 結合性および機能的影響を評価するための生化学的測定
主要な成果:
- カスパース-4/11をそのp10製品に局所的に自動処理することは,GSDMDの裂け目と熱死のために不可欠であり,十分である.
- 自動処理されたカスパース-4/11は,誘導された水害性インターフェースを通じて,GSDMDのC端領域に高親和結合を示す.
- この相互作用はカスパースの二分化と活性化を促し, kanonical tetrapeptide モチーフから独立してGSDMDの分裂につながります.
- 構造分析は,カスパース-1の同様のGSDMD認識モードを明らかにした.
結論:
- 誘導された水害性インターフェースを含むカスパスのための新しい基板認識メカニズムが発見された.
- ピロプトーシスの調節について 重要な洞察を得ました
- 特定された水害性インターフェースは,ピロプトシスカスパスの標的抑制剤の開発に有望な道を示しています.
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