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High-throughput Purification of Affinity-tagged Recombinant Proteins
Published on: August 26, 2012
アクティバターおよび一般的な転写因子によるTBP結合の強化
1Howard Hughes Medical Institute, Program in Molecular Medicine, University of Massachusetts Medical Center, Worcester 01605, USA.
Nature
|June 22, 1999
まとめ
転写活性化剤は,前始動複合体の組み立てを支援することにより,遺伝子発現を強化します. 生きた酵母細胞では,プロモーターに結合するTATA-box-binding protein (TBP) が決定的であり,他の転写因子によって影響を受けます.
科学分野:
- 分子生物学は分子生物学である.
- 遺伝学 遺伝学とは
- バイオケミストリー バイオケミストリー
背景:
- ユカリオットトランスクリプションアクティベーターは,遺伝子発現の重要なレギュレータです.
- それらは,事前イニシアチブ・コンプレックス (PIC) の組み立てを促進することによって機能します.
- PICアセンブリのインビボ分析は,大変な課題でした.
研究 の 目的:
- PICアセンブリにおけるTATA-box-binding protein (TBP) 結合のインビボ作用を調査する.
- 転写活性化剤が,生体細胞におけるTBP結合にどのように影響するかを理解する.
主な方法:
- 生きた酵母細胞におけるDNAクロスリンク/免疫プレシピテーション (CLIP) アッセイを用いた.
- 固有の酵母遺伝子と,様々な強さの活性化剤を分析した.
- 変異酵母菌株を用いて,因子要件を研究した.
主要な成果:
- TBPの結合と転写活動の相関を in vivoで実証した.
- Mot1がTBPの不活性なプロモーターへの結合を防ぐことが示された.
- TFIIBとSrb4を,TBP結合のアクティベーター媒介刺激に不可欠なGTFとして特定した.
結論:
- TBPのプロモーターへの結合は,体内では厳格に規制されています.
- アクティベータ刺激によるTBP結合は,複数のGTFを含む協力的なプロセスです.
- この研究は,PIC組立の初期段階に関するインビボの洞察を提供します.
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