関連する実験動画
Updated: Jul 18, 2026

07:56
Bacterial Delivery of RNAi Effectors: Transkingdom RNAi
Published on: August 18, 2010
米種子貯蔵タンパク質のメッセンジャーRNAを特定ERサブドメインにターゲティングする
1Institute of Biological Chemistry, Washington State University, Pullman 99164, USA.
Nature
|October 26, 2000
まとめ
米の種は,プロラミンとグルテリンという2つの主要なタイプを用いて,粉とタンパク質を貯蔵します. この研究は,タンパク質を特定のコンパートメントに誘導する,それらの貯蔵RNAのための独特のエンドプラズマ網膜 (ER) 膜ターゲティングメカニズムを明らかにしています.
科学分野:
- 植物生物学 植物生物学
- 分子生物学は分子生物学である.
- バイオケミストリー バイオケミストリー
背景:
- 米粒は重要な食糧源であり,プロラミンとグルテリンという2つの主要な貯蔵タンパク質を独特に蓄積しています.
- これらのタンパク質は,エンドプラズマ網膜 (ER) で合成されるが,貯蔵のために異なる細胞内区画に分類される.
研究 の 目的:
- ER内の米種子貯蔵タンパク質の差分分類の背後にあるメカニズムを調査する.
- タンパク質体へのプロラミンの誘導におけるRNAの局所化の役割を明らかにする.
主な方法:
- 米の種子細胞内の貯蔵タンパク質RNAの局所化の分析.
- 翻訳開始コドンの役割を含むRNAターゲティングメカニズムの調査.
主要な成果:
- 貯蔵タンパク質RNAは,特定のER膜に局在しています.
- プロラミンRNAは,RNA信号と翻訳開始を通じてプロラミンタンパク質体を積極的に標的にします.
- これは,タンパク質合成と分類のためのER内の特殊なサブドメインを示唆しています.
結論:
- ERは,特定の細胞の宛先にタンパク質を合成し,誘導する責任を負う明確なサブドメインで,区画化されています.
- RNAの局所化は,米の種子の貯蔵タンパク質の細胞内輸送を制御する重要なメカニズムです.
関連する概念動画
Types of RNA
Overview
Three main types of RNA are involved in protein synthesis: messenger RNA (mRNA), transfer RNA (tRNA), and ribosomal RNA (rRNA). These RNAs perform diverse functions and can be broadly classified as protein-coding or non-coding RNA. Non-coding RNAs play important roles in the regulation of gene expression in response to developmental and environmental changes. Non-coding RNAs in prokaryotes can be manipulated to develop more effective antibacterial drugs for human or animal use.
RNA...
Three main types of RNA are involved in protein synthesis: messenger RNA (mRNA), transfer RNA (tRNA), and ribosomal RNA (rRNA). These RNAs perform diverse functions and can be broadly classified as protein-coding or non-coding RNA. Non-coding RNAs play important roles in the regulation of gene expression in response to developmental and environmental changes. Non-coding RNAs in prokaryotes can be manipulated to develop more effective antibacterial drugs for human or animal use.
RNA...
RNA Interference
RNA interference (RNAi) is a process in which a small non-coding RNA molecule blocks the post-transcriptional expression of a gene by binding to its messenger RNA (mRNA) and preventing the protein from being translated.
This process occurs naturally in cells, often through the activity of genomically-encoded microRNAs. Researchers can take advantage of this mechanism by introducing synthetic RNAs to deactivate specific genes for research or therapeutic purposes. For example, RNAi could be used...
This process occurs naturally in cells, often through the activity of genomically-encoded microRNAs. Researchers can take advantage of this mechanism by introducing synthetic RNAs to deactivate specific genes for research or therapeutic purposes. For example, RNAi could be used...
Regulated mRNA Transport
In eukaryotes, transcription and translation are compartmentalized; an mRNA is first synthesized in the nucleus and then selectively transported to the cytoplasm for protein synthesis. Before transport, a pre-mRNA undergoes several steps of post-transcriptional modifications including splicing, 5' capping, and the addition of a poly-adenine tail. Various proteins bind to the pre-mRNA during these modifications. The mRNA transport takes place with the help of multiple proteins playing specific...
ER Retrieval Pathway
In the secretory pathway, vesicles transport proteins from one cellular compartment to another in forward transport to deliver the protein to its correct location. Occasionally, misfolded proteins and incorrect proteins escape their original compartments, and a retrieval pathway is used to return the escaped proteins to their original compartment.
The ER uses many checkpoints to prevent the entry of incorrectly folded or a resident protein as cargo onto a transport vesicle. These mechanisms...
The ER uses many checkpoints to prevent the entry of incorrectly folded or a resident protein as cargo onto a transport vesicle. These mechanisms...
Directing Proteins to the Rough Endoplasmic Reticulum
The organelle-specific signaling sequences direct proteins synthesized in the cytosol to their final destination like ER, mitochondria, peroxisomes, etc. Some of the proteins directed to ER are then trafficked via vesicles to other organelles within the cell or the extracellular environment through the Golgi complex. For example, the rough ER synthesizes soluble proteins for transportation to the lysosomes or secretion out of the cell. It can also synthesize transmembrane proteins that can...
Regulation of the Unfolded Protein Response
Inositol-requiring kinase one or IRE1 is the most conserved eukaryotic unfolded protein response (UPR) receptor. It is a type I transmembrane protein kinase receptor with a distinctive site-specific RNase activity. As the binding mechanics of the misfolded proteins with the N-terminal domain of IRE-1 are unclear, three binding models — direct, indirect, and allosteric -- are proposed for receptor activation. Nevertheless, it is known that once a misfolded protein associates with IRE1, it...

