マウスのrDNAスペーサーの繰り返し18bp配列モチーフは,核因子の結合と転写終了を媒介する
Cell
|June 20, 1986
まとめ
マウスのrDNA転写終了は,サールボックスDNA配列と特定の核タンパク質因子に依存しています. この相互作用は正確な終了を保証しますが,周囲のシーケンスも役割を果たします.
科学分野:
- 分子生物学は分子生物学である.
- 遺伝子規制 遺伝子規制
- バイオケミストリー バイオケミストリー
背景:
- トランスクリプションの終結は,遺伝子発現の重要なプロセスであり,RNA合成の正確な終了を保証します.
- リボソームDNA (rDNA) の転写は,リボソームに対する細胞の需要を満たすために厳格に規制されています.
- ネズミなどの哺乳類における終結の分子機構を理解することは,遺伝子制御を解読するために不可欠です.
研究 の 目的:
- マウスのrDNA転写終結に関与するDNA配列とタンパク質因子を特定する.
- 終結におけるサールボックス配列とその関連核因子の役割を明らかにする.
- 配列の変異がrDNA転写終結の効率と正確性にどのように影響するか調査する.
主な方法:
- 核抽出系を用いて,in vitroトランスクリプションアッセイを行いました.
- DNA配列へのタンパク質結合を検出するために,エクソヌクレアゼIIIの保護実験を行いました.
- Sall box 配列のサイト指向型変異 (削除,挿入,点変異) を実施しました.
- 合成されたサール・ボックス・コンセンサス・オリゴヌクレオチド,in vitro終結アッセイ用.
主要な成果:
- 特定のDNA配列,サールボックス (AGGTCGACCAGATTANTCCG) を特定し,マウスのrDNAの転写終了に不可欠である.
- 核タンパク質がサールボックスに結合し,終結を媒介することを実証した.
- サールボックス内の変異は,核因子相互作用を著しく低下させ,終結を妨害した.
- 合成のサールボックス配列は,効率が低下したものの,フィランキング配列の貢献を示唆し, in vitro で終了を開始しました.
結論:
- サールボックスDNA配列とその関連核タンパク質因子は,特定のマウスrDNAの転写終了に不可欠です.
- サールボックスと核因子との相互作用は,正確な終結のために非常に重要です.
- Sall boxの横に並ぶ配列は,終結プロセスの全体的な正確性と効率に寄与します.
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