人間のPAF1複合体は,SII/TFIISと独立して協力してクロマチンの転写延長に作用する
Jaehoon Kim1, Mohamed Guermah, Robert G Roeder
1The Rockefeller University, New York, NY 10065, USA.
Cell
|February 25, 2010
まとめ
PAF1複合体 (PAF1C) は,染色体からの転写延長を直接促進する. 延長因子SII/TFIISと連携して作用し,遺伝子調節におけるPAF1Cの新しい役割を明らかにした.
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
- クロマチンのダイナミクス
背景:
- PAF1複合体 (PAF1C) は転写に関連していますが,染色体転写における直接的な役割は不明です.
- 以前の研究は,直接の転写促進ではなく,ヒストンの改変におけるPAF1Cの関与に焦点を当てていた.
研究 の 目的:
- クロマチンテンプレートからの転写延長におけるヒトPAF1C (hPAF1C) の直接的な役割を調査する.
- hPAF1Cの機能のメカニズムとその他の転写因子との相互作用を解明する.
主な方法:
- 生化学的に定義されたRNAポリメラーゼII転写システム.
- 再結合クロマチンのテンプレートアッセイ.
- hPAF1Cと延長因子SII/TFIISの相互作用の分析.
主要な成果:
- hPAF1Cは,アクティベーター (p53) とヒストンアセチルトランスフェラーゼ (p300) に依存した染色体からの転写延長を直接促進する.
- ヒストンのユビキチレーションとメチレーションとは異なるhPAF1Cの新しい機能が特定されました.
- hPAF1Cと伸縮因子SII/TFIISの間の強い相乗効果が観察され,直接の相互作用とRNAポリメラーゼIIとの協同結合によって媒介された.
結論:
- hPAF1Cは,染色体からの転写延長を直接促進する独特の機能を持っています.
- クロマチン転写におけるhPAF1CとSII/TFIISの協力作用のための分子機構が明らかにされました.
- これらの発見は,遺伝子発現における転写因子協力の理解を進める.
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