CRISPR-Cas9のブロードスペクトル阻害剤
Lucas B Harrington1, Kevin W Doxzen2, Enbo Ma1
1Department of Molecular and Cell Biology, University of California, Berkeley, Berkeley, CA 94720, USA.
Cell
|August 29, 2017
まとめ
2つのアンチCRISPRタンパク質 (Acrs) は,異なるメカニズムでCas9ゲノム編集を阻害する. AcrIIC1はDNA切断を広く阻止し,AcrIIC3は標的結合を防止し,Cas9の活性を正確に制御する.
科学分野:
- 分子生物学
- 遺伝学
- 生物化学
背景:
- CRISPR-Cas9は 細菌の免疫系から派生した 強力なゲノム編集ツールです
- バクテリオファージからのアンチCRISPRタンパク質 (Acrs) は,Cas9の活性を抑制することができます.
- Acrメカニズムを理解することは,Cas9アプリケーションの精製に不可欠です.
研究 の 目的:
- 2つの抗CRISPRタンパク質であるAcrIIC1とAcrIIC3の異なる抑制メカニズムを解明する.
- これらのAcrsがCas9と相互作用してゲノム編集機能を調節する方法を調査する.
- Cas9の活動を制御するAcrsの潜在的応用を探求する.
主な方法:
- AcrIIC1とAcrIIC3によるCas9抑制を評価するための生化学的測定
- Cas9 HNHドメインを持つAcrIIC1の複雑な構造を決定するための構造生物学 (結晶学).
- AcrIIC3の存在下でのCas9二酸化とDNA結合の分析
主要な成果:
- AcrIIC1は,HNHの触媒ドメインに結合し,Cas9をDNAに結合した不活性状態に閉じ込め,様々なCas9オートログを広く抑制する.
- AcrIIC3は,ダイメリゼーションを誘導し,標的DNAの結合を防ぐことによって1つのCas9オートログを特異的に抑制する.
- 結晶構造は,AcrIIC1がCas9の触媒活性を抑制するメカニズムを明らかにした.
結論:
- AcrIIC1とAcrIIC3は,Cas9を阻害するオートゴーナル戦略を採用しています.
- これらの独特なメカニズムは,Cas9のDNA結合と分裂機能を正確に制御します.
- この発見は,先進的なゲノム編集技術における Acrs の新しい応用を示唆しています.
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