ヒストンH2BプロモーターのS相活性化は,OCA-Sによって行われ,GAPDHを主要成分として含有するコアクティベーター複合体である
Lei Zheng1, Robert G Roeder, Yan Luo
1Laboratory of Biochemistry and Molecular Biology, The Rockefeller University, 1230 York Avenue, New York, NY 10021, USA.
Cell
|July 31, 2003
まとめ
研究者は,S相依存ヒストンH2B転写に不可欠なタンパク質複合体であるOCA-Sを特定しました. その成分p38は,グリセラルデヒド-3-リン酸脱水素酵素の核形態であり,Oct-1と結合し,転写を細胞サイクル調節と代謝状態とリンクします.
科学分野:
- 分子生物学は分子生物学である.
- 細胞生物学 細胞生物学
- バイオケミストリー バイオケミストリー
背景:
- ヒストン遺伝子の転写は,細胞サイクル中,特にDNA複製のS相の間,緊密に規制されています.
- Oct-1は,ヒストン遺伝子発現を含む様々な細胞過程の調節に関与する転写因子です.
研究 の 目的:
- S相依存ヒストンH2B転写に関与するコアクティベーターを特定し,特徴づけること.
- ヒストン遺伝子発現と細胞周期調節と細胞代謝を結びつける分子機構を解明する.
主な方法:
- タンパク質の相互作用を特定するための共免疫プレシピテーション.
- プロモーターの採用を評価するためのクロマチン免疫プレシピテーション.
- インビトロとインビボの転写アッセイ.
- 酵素活性とコファクター依存性を研究するための生化学的分析.
主要な成果:
- S相依存ヒストンH2B転写に不可欠な多成分コアクティベーターであるOCA-Sを分離し,特徴づけました.
- OCA-Sの重要な構成要素としてp38を特定し,Oct-1を結合し,S相の間にH2Bプロモーターに採用されます.
- p38がグリセラルデヒド-3-リン酸脱水素酵素の核形態であり,その機能はNAD (((+) とNADHによって調節されていることが実証されました.
- OCA-SがNPATと相互作用し,ヒストンの転写を細胞サイクルレギュレータとリンクすることを示した.
結論:
- OCA-Sは,S相特異ヒストンH2B転写の重要な調節剤である.
- この発見は,OCA-S.のp38成分を介してヒストン遺伝子転写を細胞サイクル制御と細胞リドックス状態と関連付けています.
- この研究は,調整されたヒストンの遺伝子発現とDNA複製への結合を理解するための基礎を提供します.
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