C9orf72リピートによってコードされたポリディペプチドは,核細胞と結合し,RNA生殖を阻害し,細胞を殺す
Ilmin Kwon1, Siheng Xiang1, Masato Kato1
1Department of Biochemistry, UT Southwestern Medical Center, 5323 Harry Hines Boulevard, Dallas, TX 75390-9152, USA.
まとめ
セルリン:アルギニン (SR) ドメインを持つRNA結合タンパク質は,hnRNPA2ヒドロゲルと結合する. CLK1/2によるリン酸化は結合を逆転させ,C9orf72疾患ペプチドはRNAバイオゲネシスを破壊することで細胞死を引き起こす.
科学分野:
- 分子生物学は分子生物学である.
- 神経変性疾患 神経変性疾患とは
- バイオケミストリー バイオケミストリー
背景:
- セルリン:アルギニン (SR) リピートドメインは,前メッセンジャーRNAスプライシングに関与するRNA調節タンパク質において極めて重要です.
- 異質リボヌクレオプロテインA2 (hnRNPA2) の低複雑性ドメインは,繊維ポリマーとヒドロゲル滴を形成することができます.
- C9orf72遺伝子の拡張は神経変性疾患に関連しており,GRnとPRnのリピートポリペプチドを生成します.
研究 の 目的:
- SRドメインと hnRNPA2ヒドロゲルとの相互作用を調査する.
- SRドメイン-hnRNPA2ヒドロゲル結合の調節におけるリン酸化の役割を決定する.
- C9orf72派生ペプチド,特にGRnとPRnが,hnRNPA2ヒドロゲルと細胞プロセスに及ぼす細胞効果を調査する.
主な方法:
- SRドメインとhnRNPA2ヒドロゲルを用いたインビトロ結合測定法.
- CDC2型キナーゼ1と2 (CLK1/2) を用いたリン酸化アッセイ.
- 哺乳類の細胞におけるSRドメイン変種とC9orf72ペプチドの発現.
- 細胞の局所化研究とRNA生殖と細胞活性の評価.
主要な成果:
- SRドメインはhnRNPA2ヒドロゲルと結合し,この結合はCLK1/2酸化によって逆転する.
- 変異したSR-to-GR変種は,CLK1/2とは独立してhnnRNPA2ヒドロゲルを結合し,細胞内の核に局所する.
- C9orf72派生のGRnおよびPRnペプチドは,CLK1/2の活性とは無関係にhnRNPA2ヒドロゲルと結合し,細胞に入り,核に局所化し,RNA生殖を阻害し,細胞死につながる.
結論:
- CLK1/2によるリン酸化は,hNRNPA2ヒドロゲルとのSRドメイン相互作用の重要な規制メカニズムです.
- C9orf72由来ペプチドはSRドメインの相互作用を模倣するが,細胞機能を破壊し,神経変性疾患における潜在的な病原性メカニズムを示唆する.
- 発見は,疾患の病原性における異常なタンパク質-核酸相互作用の役割を強調し,RNA生体生成の調節に関する洞察を提供します.
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