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ANKRD16は,編集に欠陥のあるtRNA合成酵素によって引き起こされるニューロン損失を防ぐ
My-Nuong Vo1, Markus Terrey2,3,4,5, Jeong Woong Lee5,6
1The Skaggs Institute for Chemical Biology, Department of Molecular Medicine, Scripps Research Institute, La Jolla, CA, USA.
Nature
|May 18, 2018
まとめ
アンキリンリピートドメイン16 (ANKRD16) タンパク質は,アラニルtRNA合成酵素 (AlaRS) の誤差を修正することによって,神経変異を防ぐ. この発見は重度の病理が 編集障害を起こすのを防ぐのに不可欠な 新しいメカニズムを明らかにしています
科学分野:
- 分子生物学
- 神経科学
- 遺伝学
背景:
- アミノアシルtRNA合成酵素 (aaRS) は,変換の正確性において極めて重要であり,編集ドメインは充電エラーを修正する.
- アラニルtRNA合成酵素 (AlaRS) の突然変異は,tRNAAlaのセリン誤電を引き起こし,Aarsstiマウスの脳小胞のプルキンジェ細胞の退化を引き起こします.
研究 の 目的:
- Aarssti変異に関連する神経変性現象を変化させる遺伝的要因を特定する.
- 神経毒性を防ぐためにAnkrd16がAlaRSと相互作用する分子メカニズムを解明する.
主な方法:
- Aarssti変異と相互作用する遺伝子を特定するために位置的なクローニングが使用されました.
- ANKRD16とAlaRSの結合相互作用を決定するために生化学的測定法を使用した.
- Ankrd16のインビボ機能を評価するためにマウスモデル (Aarssti/ sti) で遺伝子操作を行った.
主要な成果:
- Ankrd16遺伝子はAarssti変異の変容体として特定され,神経変異を弱めた.
- ANKRD16は,AlaRSの触媒領域に直接結合し,誤って活性化されたセリンを捕獲し,tRNAAlaの誤電を防ぐ.
- Aarssti/stiマウスの脳におけるAnkrd16の削除は,タンパク質の集積と重要なニューロン損失をもたらします.
結論:
- ANKRD16は,tRNA合成酵素編集のアミノ酸受容共同調節剤として作用する.
- この相互作用は,tRNA合成酵素編集の欠陥から生じる重篤な病理を予防するために不可欠な新しい構造層を表しています.
- ANKRD16がニューロンの完全性と翻訳の精度を維持する上で重要な役割を強調しています.
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