RNA結合タンパク質Pub1は,上流のオープン読書フレームを含むトランスクリプトの安定性を調節する
M J Ruiz-Echevarría1, S W Peltz
1Department of Molecular Genetics and Microbiology, Robert Wood Johnson Medical School, University of Medicine and Dentistry of New Jersey, Piscataway 08854, USA. ruizeche@umdnj.edu
Cell
|July 13, 2000
まとめ
Nonsense-mediated decay (NMD) は,上流のオープン・リーディング・フレーム (uORF) を用いたトランスクリプトをターゲットにしている. しかし,Pub1タンパク質と相互作用するいくつかのmRNAの安定化要素 (STE) は,NMDを防止し,遺伝子発現を調節します.
科学分野:
- 分子生物学は分子生物学である.
- RNA 生物学 RNA 生物学
- 遺伝子規制 遺伝子規制
背景:
- nonsense-mediated mRNA decay (NMD) 経路は,早めに停止するコドンでトランスクリプトを劣化させる.
- 5'-untranslated領域のアップストリームオープンリーディングフレーム (uORF) はNMDを誘発する可能性がありますが,一部のトランスクリプトはこの劣化を回避します.
- uORFを含むトランスクリプトにおけるNMD耐性のメカニズムを理解することは,遺伝子調節にとって極めて重要です.
研究 の 目的:
- 特定のuORFを含むmRNAがNMDに抵抗するメカニズムを調査する.
- uORFsでトランスクリプトの安定性を調節する要因を特定する.
- NMDの規制におけるRNA結合タンパク質Pub1の役割を明らかにする.
主な方法:
- GCN4,YAP1,CPA1のmRNA配列と構造を分析した.
- 安定剤元素 (STE) とRNA結合タンパク質Pub1.1との相互作用を調査する.
- NMD経路の活動に対するSTEとPub1の影響を評価する.
主要な成果:
- uORFを含むGCN4およびYAP1mRNAには,安定化要素 (STE) が含まれています.
- STEはRNA結合タンパク質Pub1と相互作用し,NMDに対する耐性を授与する.
- STEが欠けているCPA1 mRNAは,NMD経路によって分解され,トランスクリプトの安定性におけるSTEの役割を強調しています.
結論:
- アップストリーム・オープン・リーディング・フレーム (uORF) は,トランスレーションとmRNAのターンオーバーの両方の重要なレギュレーターです.
- 安定剤要素 (STE) とそのPub1との相互作用は,uORFを含むトランスクリプトにおけるNMD耐性の重要な決定因子である.
- Pub1は,uORFを含むmRNAの安定性を調節する重要な因子であり,遺伝子発現の調節に影響を与えます.
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