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Updated: Jun 10, 2026

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Identification of Post-translational Modifications of Plant Protein Complexes
Published on: February 22, 2014
タイプIIIエフェクターであるADP-ribosylatesはRNA結合タンパク質を活性化させ,植物免疫を抑制する
Zheng Qing Fu1, Ming Guo, Byeong-ryool Jeong
1Plant Science Initiative and Department of Plant Pathology, University of Nebraska, Lincoln, Nebraska 68588-0660, USA.
Nature
|April 24, 2007
まとめ
細菌の病原体であるPseudomonas syringaeは,RNA結合タンパク質を改変することによって,植物免疫を抑制するためにエフェクターHopU1を使用しています. このADP-リボシライゼーションは,RNAの代謝と植物防衛遺伝子発現に影響を与えます.
科学分野:
- 植物病理学 植物病理学
- 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:
- Pseudomonas syringaeは,III型分泌システムを通じてエフェクタータンパク質を注入することで,植物病を引き起こす.
- ほとんどのP.シリンゲエエフェクターとその分子標的の機能はほとんど不明である.
研究 の 目的:
- P.シリンガエ型IIIエフェクターHopU1.1の酵素活性と機能を明らかにする.
- HopU1の宿主標的を特定し,植物免疫抑制におけるその役割を理解する.
主な方法:
- モノ-ADP-リボシルトランスフェラーゼ (ADP-RT) としてHopU1の酵素活性を決定する生化学分析.
- 生化学的アプローチを用いたアラビドプシス・タリアナ抽出物におけるHopU1基質の識別.
- アラビドopsis thalianaのノックアウトライン (例えば,grp7) のP. syringae感染に対する感受性の分析.
主要な成果:
- HopU1は植物先天免疫を抑制するモノ-ADP-リボシルトランスフェラーゼ (ADP-RT) として特定されました.
- HopU1は,GRP7 (AtGRP7) を含むRNA認識モチーフ (RRMs) を含むRNA結合タンパク質を標的とする.
- GRP7が欠けているアラビドプシスの植物は,P. syringaeに対する感受性が高まり,GRP7のHopU1媒介のADP-リボシライゼーションはRNA結合に干渉する.
結論:
- HopU1は宿主RNA結合タンパク質のADPリボシライゼーションを用いてRNA代謝を妨害し,植物免疫を抑制する.
- このメカニズムは,植物防衛トランスクリプトームを含む新しい病原性戦略を強調しています.
- HopU1の機能を理解することで,細菌の毒性や植物の免疫反応についての洞察が得られます.
関連する概念動画
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...
Defenses Against Pathogens and Herbivores
Plants present a rich source of nutrients for many organisms, making it a target for herbivores and infectious agents. Plants, though lacking a proper immune system, have developed an array of constitutive and inducible defenses to fend off these attacks.
Riboswitches
Riboswitches are non-coding mRNA domains that regulate the transcription and translation of downstream genes without the help of proteins. Riboswitches bind directly to a metabolite and can form unique stem-loop or hairpin structures in response to the amount of the metabolite present. They have two distinct regions – a metabolite-binding aptamer and an expression platform.
The aptamer has high specificity for a particular metabolite which allows riboswitches to specifically regulate...
The aptamer has high specificity for a particular metabolite which allows riboswitches to specifically regulate...
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...
Experimental RNAi
RNA interference (RNAi) is a cellular mechanism that inhibits gene expression by suppressing its transcription or activating the RNA degradation process. The mechanism was discovered by Andrew Fire and Craig Mello in 1998 in plants. Today, it is observed in almost all eukaryotes, including protozoa, flies, nematodes, insects, parasites, and mammals. This precise cellular mechanism of gene silencing has been developed into a technique that provides an efficient way to identify and determine the...
Cell Signaling in Plants
Plant cells communicate to coordinate their cycle of growth, flowering and fruiting, and activities in roots, shoots, and leaves in response to the changing environmental conditions. Plant signaling is distinct from animal signaling. Plants primarily utilize enzyme-linked receptors, whereas the largest class of cell-surface receptors in animals are G-protein coupled receptors (GPCRs). Unlike animals, receptor tyrosine kinases are rare in plants. Instead, plants have a diverse class of...

