CRISPR RNA 誘導エンドヌクレアース Cas9によるDNA 尋問
Samuel H Sternberg1, Sy Redding2, Martin Jinek3
11] Department of Chemistry, University of California, Berkeley, California 94720, USA [2].
Nature
|January 31, 2014
まとめ
Cas9酵素はゲノム工学において極めて重要であり,結合と切断のために,プロト空間器の隣接モチーフ (PAM) と呼ばれる特定のDNA配列を必要とします. PAMの承認は,Cas9を決定する.
科学分野:
- 分子生物学は分子生物学である.
- バイオケミストリー バイオケミストリー
- 遺伝学 遺伝学とは
- ゲノムエンジニアリングは,ゲノム工学です.
背景:
- クラスタリングされた定期的に間隔のある短いパリンドロミックリピート (CRISPR) 関連酵素Cas9は,強力なRNA誘導エンドヌクレアゼです.
- Cas9ガイドRNA複合体は,様々な生物のゲノム工学で広く使用されています.
- Cas9 DNA 尋問の正確なメカニズムを理解することは,その効率的な適用のために不可欠です.
研究 の 目的:
- Cas9-RNA複合体がDNAと相互作用する分子機構を解明する.
- Cas9が特定のDNA分裂部位をどのように識別するかを決定する.
- Cas9の結合と活性におけるプロトスペーサー隣接モチーフ (PAM) の役割を調査する.
主な方法:
- 単一分子の生化学実験. 単一分子の生化学実験. 単一分子の生化学実験.
- 大量生化学試験. 大量生化学試験. 大量生化学試験. 大量生化学試験.
- DNA結合と鎖分離のダイナミクスを研究するための競争アッセイ.
主要な成果:
- Cas9-RNAの結合とDNAの分裂は,トリヌクレオチドプロトスペーサー隣接モチーフ (PAM) の認識に依存しています.
- DNA結合親和性は,PAM密度と相関する;PAMが欠けている配列は,ガイドRNAと補完的であっても,ターゲットにはされません.
- PAM認識は,DNA鎖の分離とRNA-DNAヘテロデュプレックス形成を開始し,方向的に進み,Cas9の触媒活動を誘発する.
結論:
- Cas9は,PAM認識を,大規模なDNA分子の迅速なスキャンと潜在的なターゲットサイトの特定のための重要なステップとして利用しています.
- PAM配列は, Cas9.9によるDNA分裂の開始を制御する規制要素として作用します.
- これらの発見は,Cas9媒介によるゲノム編集の特異性と規制に関する根本的な洞察を提供します.
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