ユカリオット活性化剤によるトランスクリプションのシナジーの一般的なメカニズム
T Chi1, P Lieberman, K Ellwood
1Department of Biological Chemistry, University of California, Los Angeles, School of Medicine 90095-1737, USA.
Nature
|September 21, 1995
まとめ
アクティベータによるシナギスティック遺伝子活性化には,TFIID:TFIIA複合体の安定した組み立てが含まれます. プレイニシアチブ複合体の形成におけるこの初期のステップは,TFIIBを勧誘することによって,転写活動を強化します.
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
- ウイルス学 ウイルス学 ウイルス学
背景:
- ユカリオットの遺伝子発現は,RNAポリメラーゼIIプロモーターと,モジュールとして機能する上流アクティベーターに依存しています.
- これらのモジュールの協同作用は,遺伝子転写を調節する.
- エプスタイン・バーウイルス (EBV) アクティベーターであるZEBRAは,非酸性アクティベーターのシナジー研究のためのモデルを提供します.
研究 の 目的:
- アクティベータによって媒介される転写シネージーの生化学的メカニズムを調査する.
- TFIID:TFIIA (DA) コンプレックスアセンブリの作用を決定する.
- 酸性活性剤と非酸性活性剤の両方の統合メカニズムを探求する.
主な方法:
- ゼブラとGAL4-VP16活性化剤の生化学分析.
- DNase Iの足跡測定法について.
- タンパク質とDNAの相互作用を研究するためのゲルシフトアッセイ.
主要な成果:
- シンერგი的転写効果は,TFIID:TFIIA (DA) 複合体の組み立てと相関しています.
- アクティベータ依存のDA複合体は,TAFsによって規制された,安定したTFIIB結合を示す.
- TFIIBのバインディングは,複合体の安定性を高めることでシネージーを強化します.
- 同様のメカニズムは,酸性活性化剤GAL4-VP16.0で観察されました.
結論:
- 様々なアクティベータによる遺伝子活性化とシナージーの統一メカニズムが提案されています.
- トランスクリプションの調節におけるシナージーは,プレイニシエーション複合体の組み立ての初期段階に現れます.
- TFIID:TFIIA複合体へのTFIIBの安定した徴募は,シネージ的遺伝子活性化に不可欠です.
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