USP7小分子阻害剤は,ユビキチン結合を妨害する
Lorna Kategaya1,2, Paola Di Lello3, Lionel Rougé3
1Department of Discovery Oncology, Genentech, South San Francisco, California 94080, USA.
Nature
|October 19, 2017
まとめ
研究者は,その触媒部位からUSP7を標的とする選択的ユビキチン特異プロテアゼ-7 (USP7) 阻害剤であるGNE-6640とGNE-6776を開発した. これらの阻害剤は,細胞死を誘発し,薬剤の細胞毒性を強化することによって,がん治療に希望を示しています.
科学分野:
- 生物化学
- 分子生物学
- 薬物の発見
背景:
- ユビキチン系は細胞のプロセスに不可欠であり,ユビキチン特異プロテアゼ-7 (USP7) のようなデウビキキチナーゼ酵素はタンパク質の安定性を調節する.
- USP7はp53のような腫瘍抑制剤の安定性を制御することによって癌に作用するが,選択的阻害剤の開発は困難である.
研究 の 目的:
- USP7の新型選択性阻害剤を開発する
- 抑制のメカニズムを解明し,これらの阻害剤の治療的応用を探求する.
主な方法:
- 核磁共振 (NMR) ベースのスクリーニングと構造ベースの薬剤設計がUSP7阻害剤を特定し,最適化するために使用されました.
- 同結晶構造は,USP7への非共性結合を理解するために使用された.
- USP7の基質偏好を研究するために,同位体ラベリングによるディウビキチン鎖アッセイが行われました.
主要な成果:
- 2つの選択的USP7阻害剤であるGNE-6640とGNE-6776が開発されました.
- これらの化合物は,催化システインとは異なる場所でUSP7に非共性的に結合し,ユビキチン結合を弱める.
- 阻害剤は,化学療法剤とPIMキナーゼ阻害剤の細胞毒性を高め,腫瘍細胞死を誘発する.
- USP7は Lys48に結合したユビキチン鎖を優先的に結合し,分裂させる.このメカニズムは,二-ユビキチン鎖分析によって解明された.
結論:
- GNE-6640とGNE-6776は,ユビキチン結合を標的とした新しいUSP7阻害剤のクラスであり,がん治療の有望な戦略を提供します.
- これらの発見は,他のデウビキチナゼおよび関連するタンパク質に対する阻害剤の開発のためのタンパク質-ユビキチン相互作用を標的とするより広範な適用性を示唆しています.
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