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インターフェロンベータエンハンスゾームの原子模型
Daniel Panne1, Tom Maniatis, Stephen C Harrison
1The Jack and Eileen Connors Structural Biology Laboratory, Harvard Medical School, Department of Biological Chemistry and Molecular Pharmacology, Howard Hughes Medical Institute, 250 Longwood Avenue, Boston, MA 02115, USA.
Cell
|June 19, 2007
まとめ
インターフェロンベータ (IFN-β) 遺伝子
科学分野:
- 分子生物学は分子生物学である.
- 構造生物学 構造生物学とは
- 免疫学 免疫学とは
背景:
- インターフェロン-β (IFN-β) 遺伝子の転写活性化は,エンハンスオソームと呼ばれるタンパク質複合体の組み立てに依存する.
- 増強体には,転写因子ATF-2/c-Jun,インターフェロン調節因子3 (IRF-3) / IRF-7,および活性化されたB細胞の核因子kappa-light-chain-enhancer (NFkappaB) が含まれています.
- これらの因子は,IFN-β増強剤に協力的に結合し,共同活性化剤とクロマチンを改造するタンパク質をプロモーターに勧誘する.
研究 の 目的:
- 強化ゾーム組立とDNA結合の構造的基礎を解明する.
- 転写因子の協同結合がどのように達成されるかを理解する.
- IFN-β増強剤配列の進化的保存を説明するために.
主な方法:
- IRF-3,IRF-7,NFkappaBのDNA結合ドメインの結晶構造をIFN-β増強剤の半分に結合させました.
- この構造を,強化器のもう一半の以前に解明された構造と統合した.
- IFN-β強化器でエンハンスオソームアーキテクチャの完全なモデルを組み立てました.
主要な成果:
- 8つのタンパク質の結合により,IFN-β増強剤の複合DNA要素を結合するための連続した表面が生成されます.
- 強化体内の限られた直接のタンパク質とタンパク質の接触は,DNA構成の変化とコアクティベーター (例えば,CBP) との相互作用が協同結合を媒介することを示唆しています.
- タンパク質複合体とほぼすべてのDNA核酸ペアの間の広範な接触は,増強剤の配列不変性を説明する.
結論:
- この研究は,IFN-βエンハンスゾームの詳細な構造モデルを提供します.
- 協同結合は,広範なタンパク質-タンパク質インターフェースではなく,DNAの曲折とコアクティベーターとの相互作用によって促進されます.
- DNAとの包括的な相互作用は,IFN-β強化剤の機能的重要性と進化的保存を強調しています.
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