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eIF4AIIIを含む複合体は,mRNAの局所化とナンセンス媒介のmRNAの衰退に必要なものです
Isabel M Palacios1, David Gatfield, Daniel St Johnston
1Wellcome Trust/Cancer Research UK Institute and Department of Genetics, University of Cambridge, Tennis Court Road, Cambridge CB2 1QR, UK.
Nature
|February 20, 2004
まとめ
この研究では,トランスレーション開始因子eIF4AIIIとBarentszが,ハエのmRNA局所化における重要な構成要素として特定されています. これらのタンパク質は,ヒト細胞のナンセンス媒介 mRNA 崩壊 (NMD) にも重要な役割を果たし,保存された機能を明らかにします.
科学分野:
- 発達生物学 発達生物学とは
- 分子生物学は分子生物学である.
- 遺伝学 遺伝学とは
背景:
- ドロソフィラ卵細胞の後極へのmRNAの局所化は,生殖線と腹部の特異性にとって極めて重要です.
- バレンツとMago-Y14ヘテロダイマーは,この局所化プロセスに関与するトランス作用因子として知られています.
- BarentszとMago-Y14の間の直接的な相互作用は,以前は確立されていなかった.
研究 の 目的:
- オスカルのmRNA局所化複合体内の分子相互作用を調査する.
- mRNAの局所化に関与する新しい成分とその機能的役割を特定する.
- 無意味媒介 mRNA 崩壊 (NMD) などの他の細胞過程におけるこれらの構成要素の保存された機能を調査する.
主な方法:
- 共同免疫プレシピテーションは,タンパク質とタンパク質の相互作用を検出するための測定法です.
- リボヌクレオプロテイン粒子 (RNP) 組成の分析.
- ノンセンセス媒介 mRNA 崩壊 (NMD) の役割を評価するために,ヒト細胞における機能的測定法.
主要な成果:
- 翻訳開始因子eIF4AIIIはBarentszと相互作用し,oskar mRNA RNPの局所化複合体の一部である.
- eIF4AIIIはまた,Mago-Y14ヘテロダイマーと相互作用し,BarentszとMago-Y14との間の分子結合を確立します.
- バレンツとeIF4AIIIは,ヒト細胞のナンセンス媒介 mRNA 崩壊 (NMD) に不可欠であることが判明しました.
結論:
- eIF4AIIIとBarentszは,保存されたタンパク質複合体の重要な構成要素として識別されています.
- この複合体は,ドロソフィラにおけるmRNA局所化と,哺乳類におけるナンセンス媒介 mRNA分解 (NMD) の両方に不可欠である.
- この発見は,種間のmRNA局所化と監視経路を結びつける保存された分子機構を明らかにしています.
関連する概念動画
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...
Initiation of Translation
Initiating translation is complex because it involves multiple molecules. Initiator tRNA, ribosomal subunits, and eukaryotic initiation factors (eIFs) are all required to assemble on the initiation codon of mRNA. This process consists of several steps that are mediated by different eIFs.
First, the initiator tRNA must be selected from the pool of elongator tRNAs by eukaryotic initiation factor 2 (eIF2). The initiator tRNA (Met-tRNAi) has conserved sequence elements including modified bases at...
First, the initiator tRNA must be selected from the pool of elongator tRNAs by eukaryotic initiation factor 2 (eIF2). The initiator tRNA (Met-tRNAi) has conserved sequence elements including modified bases at...
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...
Initiation of Translation
Initiating translation is complex because it involves multiple molecules. Initiator tRNA, ribosomal subunits, and eukaryotic initiation factors (eIFs) are all required to assemble on the initiation codon of mRNA. This process consists of several steps that are mediated by different eIFs.
First, the initiator tRNA must be selected from the pool of elongator tRNAs by eukaryotic initiation factor 2 (eIF2). The initiator tRNA (Met-tRNAi) has conserved sequence elements including modified bases at...
First, the initiator tRNA must be selected from the pool of elongator tRNAs by eukaryotic initiation factor 2 (eIF2). The initiator tRNA (Met-tRNAi) has conserved sequence elements including modified bases at...
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,...

