酵母GAL4タンパク質とファグT7RNAポリメラーゼのキメラによるテンプレートスーパーコーリング
E A Ostrander1, P Benedetti, J C Wang
1Department of Biochemistry and Molecular Biology, Harvard University, Cambridge, MA 02138.
まとめ
研究者は,酵母 GAL4 DNA結合ドメインと細菌 T7 RNAポリメラーゼを融合させ,キメリック酵素を作り出した. このエンジニアリングされたタンパク質は,特異的に,転写中にT7プロモーター配列を含むDNAをスーパーコイルします.
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
背景:
- バクテリオファージT7RNAポリメラーゼは,転写のための重要な酵素である.
- イーストのGAL4タンパク質は,DNAにアンカーできるDNA結合ドメインを持っています.
研究 の 目的:
- T7RNAポリメラーゼとGAL4DNA結合ドメインを組み合わせたキメリック酵素を作成する.
- このエンジニアリングされた酵素のDNAスーパーコイリング能力を調査するために.
主な方法:
- 酵母GAL4DNA結合ドメインの遺伝子融合とバクテリオファージT7RNAポリメラーゼ.
- キメリック酵素を用いたインビトロおよびインビボの転写アッセイ.
- キメリックポリメラーゼによって誘発されたDNAスーパーコイリングの分析.
主要な成果:
- キメリック酵素は,両方の親タンパク質の性質を保持した.
- GAL4結合はDNAのアンカリングを促進し,超巻きDNAループの形成につながった.
- スーパーコーリングは,T7プロモーター配列に依存する,転写中に発生しました.
結論:
- チメリックポリメラーゼは,特異的にT7プロモーターを含むDNAセグメントをスーパーコイルします.
- このエンジニアリングされた酵素は,インビトロおよびインビボでの標的DNA操作のための新しいツールとして機能します.
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