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FUS相分離は,分子チャペロンとアルギニンカチオン-π相互作用のメチル化によって調節される
Seema Qamar1, GuoZhen Wang1, Suzanne J Randle1
1Cambridge Institute for Medical Research, Department of Clinical Neurosciences, University of Cambridge, Cambridge CB2 0XY, UK.
Cell
|April 21, 2018
まとめ
アルギニンの低メチル化によるFUSタンパク質の凝縮は,前頭葉変性 (FTLD) を引き起こします. FUSの凝結を防ぎ ニューロンの機能を救います
科学分野:
- 生物化学
- 分子生物学
- 神経科学
背景:
- FUSのようなタンパク質の可逆相分離は 膜のない臓器細胞にとって極めて重要です
- FUSの本質的に無秩序な低複雑性 (LC) ドメインがこの相分離を駆動する.
研究 の 目的:
- FUS相分離におけるカチオン-π相互作用とアルギニンメチル化の役割を調査する.
- FUSの凝縮が前頭葉変性 (FTLD) にどのようにつながるのかを理解する.
- FUSの相分離の生理学的調節因子とその治療の可能性を特定する.
主な方法:
- FUSの低複雑性領域とC端領域の分析
- タイロシンとアルギニンの残留物間のカチオン-π相互作用を調査する.
- 翻訳後のアルギニンメチル化がFUS相分離に与える影響を評価する.
- FUSの分子チャペロンとしてのトランスポートの役割を研究する.
主要な成果:
- タイロシンとアルギニンが関与する協力性カチオン-π相互作用は,FUS相分離に寄与する.
- アルギニンの低甲化は,FUS相分離と凝固を有意に促進する.
- 低メチル化FUSは安定したβシートに富んだヒドロゲルを形成し,RNPの粒子の機能を破壊し,タンパク質合成を損なう.
- FUS相分離を減らし,タンパク質合成を救出する.
結論:
- FUS相分離は,カチオン-π相互作用とアルギニンメチル化によって制御される.
- 低メチル化によるFUS凝縮はFTLDの病原性における重要なメカニズムである.
- トランスポートは,病的なFUS凝縮を防止し,ニューロンの機能を維持する上で重要な役割を果たします.
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