リガンド適合バイアスは,Hsp90の表面暴露ライシンをエナチオセレクティブに変更する
Adolfo Cuesta1, Xiaobo Wan1,2, Alma L Burlingame2
1Department of Cellular and Molecular Pharmacology , University of California , San Francisco , California 94158 , United States.
Journal of the American Chemical Society
|February 4, 2020
まとめ
研究者は,共性阻害剤を用いてタンパク質を選択的に標的とする新しい戦略を開発した. 制限されたリンカーを設計することで,熱ショックタンパク質90 (Hsp90) のライシン残留物の迅速かつ特異的な修正を達成し,薬物開発の可能性を高めました.
科学分野:
- 化学生物学
- 構造生物学
- 薬物の発見
背景:
- 表面に暴露されたライシンをコバルント阻害剤で標的化することは,低反応性および広範囲に存在するため困難である.
- コヴァレント改変率を増加させる既存の方法は,電粒子の反応性を増加させることで,標的外効果のリスクがあります.
研究 の 目的:
- 結合親和性や電愛性とは関係なく,ライシン標的阻害剤の共性変異率 (k_inact) を増加させる方法を開発する.
- Lys58で熱ショックタンパク質90 (Hsp90) の選択的共換変異を達成する.
主な方法:
- キラルでコンフォメーション的に制約されたリンカンドを設計・合成した.
- アリルスルフォニルフッ化物化学を用いて,標的型共性変異を行った.
- リガンドとタンパク質の相互作用を研究するために,生化学的測定法と高解像度の結晶学を用いた.
- 選択的Hsp90共性改変の細胞効果を調査した.
主要な成果:
- エンジニアリングされたリンクは,Lys58でHsp90の迅速かつエナチオセレクティブの共換変異を可能にしました.
- 結晶構造は,リガンド構成によるエナチオ選択性のメカニズムを明らかにした.
- セルラーHsp90の選択的共性ターゲティングは,長期の熱ショック反応を誘導した.
- このアプローチは,挑戦的なライシン残基の共性改変を成功裏に加速させた.
結論:
- リンガンドの構成制約は,共換変異率を高める強力な戦略です.
- この方法は,タンパク質の表面に弱い反応性のあるリジン残基を選択的に標的にすることができます.
- この発見は,標的型共性阻害剤の開発に重大な影響を及ぼします.
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