イースト TATA ボックス結合因子 TFIID TFIIDの構造-機能関係の分析
M Horikoshi1, T Yamamoto, Y Ohkuma
1Laboratory of Biochemistry and Molecular Biology, Rockefeller University, New York, New York 10021.
Cell
|June 29, 1990
まとめ
研究者らは,Saccharomyces cerevisiae TFIIDの大きなC末端領域 (残留63-240) を特定し,TATAボックス結合と転写を担当しています. この領域は種間で保存され,TFIIDはDNAをモノマーとして結合します.
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:
- TFIID (転写因子II D) は,真核生物における重要な一般的な転写因子である.
- TFIIDドメインの構造-機能関係を理解することは,転写調節を解明するために不可欠です.
- 以前の研究では,TFIIDのC端部領域内の構造的モチーフが保存されていることが示唆されました.
研究 の 目的:
- Saccharomyces cerevisiae TFIIDの機能ドメインを体系的にマッピングし,DNA結合と転写活動の責任を負う.
- TFIID機能における保存されたC端末領域の役割を調査する.
- DNA結合中のTFIIDのオリゴメリック状態を決定する.
主な方法:
- S. cerevisiae TFIIDのN端末,C端末,内部消去変異体の構成とインビトロ発現.
- DNA移動シフトアッセイは,TATAボックス結合活動を評価する.
- 基礎レベルの転写活動を評価するためのインビトロ転写アッセイ.
- 結合ステキオメトリーを決定するためのデレーション変異体のコトランスレーション研究.
主要な成果:
- 有意なC末端領域 (残留63-240) は,TATAボックス結合と基礎転写の両方に責任を負うドメインを含むと特定されました.
- この機能的に重要な領域は,以前に指摘された構造的モチーフを含んでおり,種間で高度に保存されています.
- 削除変異コトランスレーションの研究は,TFIIDが単体としてDNAに結合することを実証しました.
結論:
- S. cerevisiae TFIIDの大きなC末端領域 (63-240) は,DNA結合および転写活性化機能に不可欠である.
- TFIIDのDNAへのモノメリック結合は,その組立と,前始動複合体における役割に影響を及ぼします.
- これらの発見は,TFIIDの構造,保存,および真核細胞の転写開始におけるその作用機構のより深い理解に貢献します.
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