神経細胞外細胞症に対するSNARE-コンプレキシン-シナプトタグミン複合体
Qiangjun Zhou1,2, Peng Zhou1, Austin L Wang1,2
1Department of Molecular and Cellular Physiology, Howard Hughes Medical Institute, Stanford University, Stanford, California 94305, USA.
Nature
|August 17, 2017
まとめ
この研究は,シナプトタグミン-1,コンプレキシン,SNAREタンパク質が神経伝達物質の放出を制御するためにどのように協力するか明らかにしています. シナプトタグミン"の2つのキーインターフェースは 核融合装置のロックを解除するために不可欠です
科学分野:
- 神経科学
- 分子生物学
- 構造生物学
背景:
- 誘発された同期神経伝達物質の放出は,シナプトタグミン,コンプレキシン,およびSNAREタンパク質に依存しています.
- その協力の正確な分子メカニズムは ほとんど不明です
研究 の 目的:
- シナプトタグミン-1,コンプレキシン,およびSNAREタンパク質の融合前の状態の相互作用の構造的基礎を解明する.
- これらの相互作用が 神経伝達物質の同期放出を 制御する仕組みを理解するためです
主な方法:
- プリムされたSNARE-コンプレキシン-シナプトタグミン-1複合体の結晶構造の決定.
- 特定されたインターフェースの機能的重要性を評価するための生化学的測定と変異性.
主要な成果:
- 主要なインターフェースに加えて,シナプトタグミン-1とSNARE-コンプレキシンのバンドルの間の新しい三部位インターフェースを明らかにした.
- ニューロンの同期放出を 大きく損なうことが示された.
- シナプトタグミン-1へのCa2+結合が複合体を解き放ち,SNAREのジッパーと膜融合を可能にすることが示された.
結論:
- 両方の同定されたシナプトタグミン- 1 インターフェースは,プライムされた前融合状態と同期神経伝達物質の放出に不可欠です.
- 三重複合体はCa2+によって解鎖され,膜融合が開始され,コンプレキシンとシナプトタグミン-1のタイミングの役割が説明される.
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