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菌類のミトコンドリアカルシウムユニポーターの冷凍-EM構造
Nam X Nguyen1,2, Jean-Paul Armache3, Changkeun Lee1,2,4
1Howard Hughes Medical Institute and Department of Physiology, University of Texas Southwestern Medical Center, Dallas, TX, USA.
Nature
|July 12, 2018
まとめ
菌類のミトコンドリアカルシウムユニポーター (MCU) の構造が決定され,その組成と,それが選択的にミトコンドリア膜にカルシウムイオンを輸送する方法についての洞察が明らかになった.
科学分野:
- 生物化学
- 構造生物学
- 分子生物学
背景:
- ミトコンドリアカルシウムユニポーター (MCU) は,細胞カルシウムホメオスタシスの重要なレギュラーである.
- MCUの構造を理解することは,カルシウムシグナル伝達とミトコンドリアの生理学におけるその機能を解読するために極めて重要です.
研究 の 目的:
- Neosartorya fischeri MCU (NfMCU) の高解像度構造を決定する.
- MCUの組み立て,カルシウム選択性,および阻害剤の相互作用を明らかにする.
主な方法:
- フェーズプレート冷凍電子顕微鏡を用いて,NfMCUの構造を決定した.
- 構造は3.8 Åの解像度で詳細な原子分析が可能になった.
主要な成果:
- NfMCUは,ヒトMCUと比較して全体的なアーキテクチャを保存したホモテトラメリックチャネルを形成する.
- 構造は,アミノ末端領域と,TM2ヘリクスの選択性フィルターを持つイオン伝導孔領域によって形成されたテトラメリックリングを明らかにする.
- 保存されたDIMEモチーフのサイドチェーンは孔内に位置し,カルシウム浸透における役割を示唆しています.
結論:
- 決定されたNfMCU構造は,MCUチャネルの組立と機能のための分子ブループリントを提供します.
- 選択性フィルターとDIMEモチーフの洞察は,カルシウム関連疾患における治療的介入の潜在的なターゲットを提供します.
- この研究は,ミトコンドリアのカルシウム輸送と,その調節に関する理解を深めています.
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