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リングヌクレアスは,周期性オリゴアデニラートを分解することによって,CRISPR型リボヌクレアスを無効化する
Januka S Athukoralage1, Christophe Rouillon1, Shirley Graham1
1Biomedical Sciences Research Complex, School of Biology, University of St Andrews, St Andrews, UK.
Nature
|September 21, 2018
まとめ
CRISPR細菌の免疫システムにおける 重要な分子であるサイクルオリゴアデニラートを分解する 新種のリングヌクレアスを 発見しました この発見により 抗ウイルス状態の 停止が説明され CRISPR-Cas 免疫に対する理解が 完成しました
科学分野:
- 微生物学と分子生物学
- 遺伝子規制と遺伝子編集技術
背景:
- CRISPR-Casシステムは,プロカリオットに移動性遺伝子要素に対する適応免疫を与えます.
- タイプIIIのCRISPRエフェクタ複合体は,標的RNA結合時にサイクルオリゴアデニラート (cOA) の二次メッセンジャーを合成する.
- cOAは下流因子を活性化し,抗ウイルス状態を誘発しますが,システムの"オフスイッチ"メカニズムは不明でした.
研究 の 目的:
- 周期性オリゴアデニラート分子を分解する核酵素を特定する.
- CRISPR媒介の抗ウイルス状態が無効化するメカニズムを解明する.
主な方法:
- 循環性オリゴアデニラート分解核酸の活性を特定し,特徴付けるための生化学的分析.
- CRISPRに関連した Rossman-foldファミリーのメンバーである,特定された核酵素の構造分析.
主要な成果:
- 周期性テトラデニラート (cT) リングを特異的に分解する新しい"リング核酶"の特定.
- リングヌクレアスは金属に依存しないメカニズムで作用し,cTを線形ダイアデニラート種に分解する.
- この分解プロセスは CRISPRによる抗ウイルス状態を 効果的に切断します
結論:
- リングヌクレアスの発見は CRISPR-Casシステムの 規制の"オフスイッチ"について 重要な洞察を与えてくれます
- この発見は,CRISPR型免疫のメカニズムの理解を完了し,重要な規制のステップを強調しています.
- 特定されたリングヌクレアスは,CRISPRに関連したタンパク質ファミリー内の新しい種類の酵素を表しています.
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