アラビドプシスのエチレン信号のEIN2指向トランスレーション制御
Wenyang Li1, Mengdi Ma1, Ying Feng1
1The State Key Laboratory of Protein and Plant Gene Research, College of Life Sciences, Peking University, Beijing 100871, China.
Cell
|October 27, 2015
まとめ
エチレンシグナル伝達には,EBF1およびEBF2mRNAの翻訳を抑制する重要なタンパク質EIN2が含まれています. このプロセスはmRNA 3' UTRsとPolyUモチーフを使用し,新しい植物ホルモン調節層を明らかにします.
科学分野:
- 植物生物学
- 分子植物生理学
- 生物化学
背景:
- エチレンは,成長と発達を調節する重要なガス状の植物ホルモンです.
- EIN2は,エチレンシグナル伝達における既知の信号トランスデューサーであり",割れ目とシャトル"モデルで動作します.
- 以前のモデルは,転写制御における EIN2 の役割に焦点を当てていた.
研究 の 目的:
- EIN2によるエチレン信号の代替メカニズムを明らかにする.
- 標的mRNAの翻訳的調節におけるEIN2の役割を調査する.
- この新しい経路に関与するシス作用要素とタンパク質因子を特定する.
主な方法:
- EBF1/2 mRNA 3' UTRの規制要素の分析
- 3' UTRs内のポリウリジラート (PolyU) モチーフの識別
- EIN2- mRNAとEIN2- タンパク質の相互作用を研究する共免疫プレシピテーションアッセイ.
- 処理体 (P体) を含む細胞質内のmRNAとタンパク質の移動を追跡するための局所化研究.
主要な成果:
- EIN2はEBF1およびEBF2mRNAの翻訳を直接抑制する.
- EBF1/ 2 mRNAの3' UTRには,この抑制を媒介する機能的なポリウリジラート (PolyU) モチーフが含まれています.
- エチレンシグナリングは,これらの3' UTR に結合する EIN2 を誘発する.
- EIN2は,EIN5やPABのような因子との相互作用を通じて,EBF1/ 2mRNAを細胞質P体に標的化することを促進する.
結論:
- 変換調節は植物におけるエチレン信号伝達の重要な構成要素である.
- mRNA 3' UTRは細胞信号を感知し,それを伝達する"信号変換器"として機能する.
- この研究は,EIN2が遺伝子発現を翻訳レベルで制御する新しいメカニズムを明らかにし,植物ホルモンシグナル伝達に関する理解を広げています.
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