Upf1 ATPase依存のmRNP分解は,ナンセンス媒介のmRNA分解を完了するために必要です
Tobias M Franks1, Guramrit Singh, Jens Lykke-Andersen
1University of Colorado, Boulder, 80309, USA.
Cell
|December 15, 2010
まとめ
RNAヘリケーゼ Upf1 は,Upf1 を生成している.
科学分野:
- 分子生物学は分子生物学である.
- 遺伝子発現の規制について
- RNAの代謝について
背景:
- 細胞のmRNAはメッセンジャーリボ核タンパク質 (mRNP) コンプレックスに編成されています.
- これらの複合体は,転写後の遺伝子発現を調節する.
- mRNAのターンオーバーには,mRNAの分解とタンパク質のリサイクルが含まれますが,タンパク質の放出メカニズムは不明です.
研究 の 目的:
- 腐敗するメッセンジャーリボヌクレオプロテイン (mRNP) 複合体からタンパク質が放出されるメカニズムを調査する.
- 無意味媒介型mRNA衰退 (NMD) 中のメッセンジャーリボ核タンパク質 (mRNP) の分解におけるRNAヘリケーズUpf1の役割を決定する.
主な方法:
- RNAヘリケーズUpf1.1.のATPアゼ活性について研究した.
- 無意味媒介 mRNA 崩壊 (NMD) 中のメッセンジャー リボヌクレオプロテイン (mRNP) の分解を調査した.
- Upf1 ATPaseの活性がない場合,メッセンジャーリボ核タンパク質 (mRNP) の中間物質の蓄積を分析した.
主要な成果:
- Upf1 ATPase活性が,ナンセンス媒介 mRNA 崩壊 (NMD) 中のメッセンジャーリボヌクレオプロテイン (mRNP) の分解を誘導することを実証した.
- Upf1 ATPaseの活性がない部分的に分解されたNMDメッセンジャーリボヌクレオプロテイン (mRNP) の中間物質の蓄積が観察されました.
- これらの中間物質は,NMD因子と関連しており,処理器官に局所化することが示されました.
結論:
- Upf1によるATP水解は,ナンセンス媒介型mRNA衰退 (NMD) 中のメッセンジャーリボ核タンパク質 (mRNP) 複合体の分解と周回に不可欠です.
- タンパク質の放出を含むmRNA分解の重要な,潜在的に規制されたステップを発見しました.
- 他のmRNA分解経路におけるタンパク質放出メカニズムを探求する必要性を強調しています.
関連する概念動画
Nonsense-mediated mRNA Decay
The Upf proteins that carry out nonsense-mediated decay (NMD) are found in all eukaryotic organisms, including humans. Each protein has an individual role, but they need to work in collaboration. Upf1 is an ATP-dependent RNA helicase that unwinds the RNA helix. Because Upf1 can unwind any RNA, Upf2 and Upf3 are required to help Upf1 discriminate between nonsense and normal mRNAs.
Usually, Upf3 binds to an Exon Junction Complex (EJC) at mRNA splice sites. If a ribosome fully translates the mRNA,...
Usually, Upf3 binds to an Exon Junction Complex (EJC) at mRNA splice sites. If a ribosome fully translates the mRNA,...
Nonsense-mediated mRNA Decay
The Upf proteins that carry out nonsense-mediated decay (NMD) are found in all eukaryotic organisms, including humans. Each protein has an individual role, but they need to work in collaboration. Upf1 is an ATP-dependent RNA helicase that unwinds the RNA helix. Because Upf1 can unwind any RNA, Upf2 and Upf3 are required to help Upf1 discriminate between nonsense and normal mRNAs.
Usually, Upf3 binds to an Exon Junction Complex (EJC) at mRNA splice sites. If a ribosome fully translates the mRNA,...
Usually, Upf3 binds to an Exon Junction Complex (EJC) at mRNA splice sites. If a ribosome fully translates the mRNA,...
Nuclear Export of mRNA
Before mRNAs are exported to the cytoplasm, it is crucial to check each mRNA for structural and functional integrity. Eukaryotic cells use several different mechanisms, collectively known as mRNA surveillance, to look for irregularities in mRNAs. Irregular or aberrant mRNA are rapidly degraded by various enzymes. If a defective mRNA escapes the surveillance, it would be translated into a protein which would either be non-functional or not function properly. One of the primary irregularities in...
Nuclear Export of mRNA
Before mRNAs are exported to the cytoplasm, it is crucial to check each mRNA for structural and functional integrity. Eukaryotic cells use several different mechanisms, collectively known as mRNA surveillance, to look for irregularities in mRNAs. Irregular or aberrant mRNA are rapidly degraded by various enzymes. If a defective mRNA escapes the surveillance, it would be translated into a protein which would either be non-functional or not function properly. One of the primary irregularities in...
mRNA Stability and Gene Expression
The structure and stability of mRNA molecules regulates gene expression, as mRNAs are a key step in the pathway from gene to protein. In eukaryotes, the half-life of mRNA varies from a few minutes up to several days. mRNA stability is essential in growth and development. The absence of the proteins regulating its stability, such as tristetraprolin in mice, can cause systemic issues, including bone marrow overgrowth, inflammation, and autoimmunity.
Cis-acting Elements involved in mRNA stability
Cis-acting Elements involved in mRNA stability
mRNA Stability and Gene Expression
The structure and stability of mRNA molecules regulates gene expression, as mRNAs are a key step in the pathway from gene to protein. In eukaryotes, the half-life of mRNA varies from a few minutes up to several days. mRNA stability is essential in growth and development. The absence of the proteins regulating its stability, such as tristetraprolin in mice, can cause systemic issues, including bone marrow overgrowth, inflammation, and autoimmunity.
Cis-acting Elements involved in mRNA stability
Cis-acting Elements involved in mRNA stability


