K-Ras (G12C) 阻害剤は,GTPの親和性と効果因子の相互作用をアロステリックに制御する
Jonathan M Ostrem1, Ulf Peters, Martin L Sos
11] Department of Cellular and Molecular Pharmacology, Howard Hughes Medical Institute, University of California, San Francisco, California 94158, USA [2].
Nature
|November 22, 2013
まとめ
研究者らは,K-Ras (G12C) がん変異を標的とした新しい小分子を開発した. これらの阻害剤は不可逆的に結合し,新しい標的となる部位を作り,変異体特有の治療戦略を提供します.
科学分野:
- 腫瘍学 腫瘍学
- 分子生物学は分子生物学である.
- ドラッグ・ディスカバリー・ドリッグ・ディスカバリー・ドリッグ・ディスカバリー・ドリッグ・ディスカバリー
背景:
- K-Rasの体内の変異は,がんではよく見られ,治療の結果が悪いことに関連しています.
- K-Rasを直接標的にすることは,GTP/GDPに対する高い親和性と,既知のアロステリック部位の欠如のために困難です.
- 腫瘍性K-Ras変異はGTPの水解を阻害し,活性GTP結合Ras.の割合を増加させます.
研究 の 目的:
- 腫瘍性K-Ras (G12C) 変異体を選択的に標的にする小分子を開発する.
- K-Ras (((G12C)) の新しいアロステル結合部位を特定し,検証する.
主な方法:
- K-Ras (((G12C) に特異的な不可逆的な小分子阻害剤の開発.
- 結晶学的研究により,結合メカニズムを明らかにし,新しいポケットを特定します.
- ヌクレオチド結合とエフェクタ相互作用を評価するための生化学分析.
主要な成果:
- 変異したシステイン経由でK-Ras (G12C) に特異的に結合する不可逆的阻害剤が開発されました.
- 結晶学では,スイッチII領域の下にある新しい結合ポケットが明らかになった.
- 阻害剤の結合はスイッチIとスイッチIIを妨害し,ニュクレオチド偏好をGTPからGDPにシフトさせ,Raf結合を損なう.
結論:
- K-Ras (((G12C) の新しい,突然変異特有のアロステリックサイトが特定され,検証されました.
- これらの発見は,K-Ras (G12C) 変異がんに対する標的治療の開発のための構造ベースの戦略を提供します.
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