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CBPへのRNA結合はヒストンのアセチル化と転写を刺激する
Daniel A Bose1, Greg Donahue1, Danny Reinberg2
1Cell and Developmental Biology, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA; Epigenetics Program, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA.
Cell
|January 14, 2017
まとめ
CBP/p300タンパク質は,強化RNA (eRNA) に直接結合する. この相互作用は活性増強剤の遺伝子発現とクロマチンの構造に影響を及ぼします.
科学分野:
- 分子生物学
- エピジェネティクス
- 遺伝子規制
背景:
- CBP/p300は遺伝子発現の調節に不可欠な転写共同活性化剤である.
- 主要なシス調節要素であるエンハンサーは,CBP/p300結合および活性転写生成エンハンサーRNA (eRNA) によって特徴付けられる.
- 活性増強剤は,オープンクロマチンの特徴であるCBP/ p300依存ヒストンのアセチル化を示す.
研究 の 目的:
- CBP/p300とRNA分子の間の直接的な相互作用を調査する.
- CBP/p300の活性に対するRNA結合の機能的影響を決定する.
- エラーナ-CBP/p300の相互作用がエンハンサー機能と遺伝子調節における役割を明らかにする.
主な方法:
- CBP/p300-RNAの相互作用を検出するための in vivoおよびin vitro結合測定法.
- ヒストンアセチルトランスフェラーゼ (HAT) 測定法で,CBP/p300の酵素活性を測定する.
- ヒストンのアセチル化マーク (例えば,H3K27ac) と遺伝子発現の変化の分析
主要な成果:
- CBP/p300タンパク質は,eRNAの有意な割合を含むRNA分子に直接結合する.
- CBP/p300のHAT領域内のRNA結合領域は,そのHAT活動をRNA依存的に刺激する.
- CBP/ p300との eRNAの相互作用は,特定のヒストンのアセチル化変化を引き起こし,活性増強剤の標的遺伝子発現を調節する.
結論:
- eRNAはCBP/p300と直接相互作用し,その機能を調節する.
- このRNA媒介によるCBP/p300活性の刺激は,活性増強剤におけるクロマチンの構造の確立に不可欠である.
- CBP / p300- eRNAの相互作用は,増強剤による遺伝子発現の正確な調節に重要な役割を果たします.
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