C9orf72 ARF GAP複合体の構造は,ALSとFTDでは不十分である
Ming-Yuan Su1,2, Simon A Fromm1,2, Roberto Zoncu1,2
1Department of Molecular and Cell Biology, University of California, Berkeley, Berkeley, CA, USA.
Nature
|August 28, 2020
まとめ
C9orf72-SMCR8-WDR41複合体について
科学分野:
- 神経科学
- 分子生物学
- 構造生物学
背景:
- C9orf72変異はアミオトロフィック横筋硬化症 (ALS) と前頭葉変性 (FTD) の主要な遺伝的原因です.
- C9orf72のハプロイン不足と再発は,これらの神経変性疾患における神経機能障害に寄与する.
- 細胞過程におけるC9orf72の正確な分子機能は,まだ完全に理解されていません.
研究 の 目的:
- C9orf72-SMCR8-WDR41複合体の構造的基礎を解明する.
- 細胞経路における この複合体の機能的役割を調査する
- C9orf72の機能障害が 神経変異にどのように貢献するのかを理解する.
主な方法:
- C9orf72-SMCR8-WDR41複合体の高解像度構造を決定するために,冷凍電子顕微鏡を用いた.
- 複合体の酵素活性を評価するために生化学的測定法を使用した.
- アミノ酸飢餓を含む様々な条件下で細胞局所化研究が行われました.
主要な成果:
- 凍結-EM構造は,WDR41とSMCR8 DENNドメインの間の特定の相互作用を持つ,目スリップフックに似ているユニークなアセンブリを明らかにしました.
- C9orf72-SMCR8-WDR41複合体は,アミノ酸の飢餓時にリソソームに局所され,栄養素の感知または応答における役割を示唆する.
- この複合体は,小型のGTPaseのARFファミリーに特化したGTPase活性化タンパク質 (GAP) として特定されました.
結論:
- C9orf72-SMCR8-WDR41複合体の構造的および機能的特徴は,正常な細胞生理におけるC9orf72の役割に関する重要な洞察を提供します.
- この発見は,C9orf72をARF GTPasesのGAPとして確立し,基本的な細胞シグナル伝達経路とリンクします.
- この複合体の機能を理解すると,ALSやFTDのようなC9orf72に関連した神経変性疾患に対する新しい治療目標が明らかになる可能性があります.
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