まとめ
クセノパス・オオサイト核抽出物は,再結合DNAから5SRNA遺伝子を正確に転写する. RNAポリメラーゼIIIは,ウイルスのRNA合成を含む転写の90%以上を担っています.
科学分野:
- 分子生物学は分子生物学である.
- 遺伝子発現の表現について
- RNA合成RNA合成について
背景:
- ユカリオット遺伝子の正確な転写には,特定の核因子が必要です.
- Xenopus laevisの卵細胞は,強力な転写システムを備えています.
- 再結合DNA技術は,特定の遺伝子転写の研究を可能にします.
研究 の 目的:
- Xenopus 5S RNA遺伝子の正確な転写をインビトロで調査する.
- 5S RNA合成に責任のあるRNAポリメラーゼを特定するために.
- クセノプス・オオサイト核抽出物における再結合DNAの転写を特徴づけるために.
主な方法:
- Xenopus laevisの卵細胞から核上水分を調製する.
- Xenopus 5S RNA遺伝子を含む再結合プラズミッドを用いたトランスクリプションアッセイ.
- ゲル電泳とオリゴヌクレオチド指紋による合成RNAの分析.
- アルファ-アマニチンを用いてRNAポリメラーゼ活性を特定するための抑制研究.
主要な成果:
- 核上位分子は,Xenopus 5S RNA遺伝子を正確に転写する.
- トランスクリプションは遅延期を呈し,その後は持続的な合成速度が続く.
- RNAポリメラーゼIIIは,合成されたRNAの90%以上を転写する.
- アデノウイルス2のDNAはまたRNAポリメラーゼIIIによって転写され,ウイルスに関連したRNA1.1.を生成する.
結論:
- クセノプス・オオサイト核抽出物は,5S RNA遺伝子転写を研究するためのシステムを提供します.
- RNAポリメラーゼIIIは,このシステムにおける内生性DNAとウイルスDNAの両方の転写に主要な役割を果たします.
- 転写効率は,DNA濃度とイオン条件によって影響を受けます.
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