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Expanding the Toolkit for In Vivo Imaging of Axonal Transport
Published on: December 23, 2021
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ロドプシン の トポロジック 逆転 に よっ て オプトジェネティクス ツール キット を 拡張 する
Jennifer Brown1, Reza Behnam2, Luke Coddington2
1Janelia Research Campus, Howard Hughes Medical Institute, Ashburn, VA 20147, USA; Department of Physiology, Development and Neuroscience, University of Cambridge, Cambridge CB2 3EG, UK.
Cell
|October 23, 2018
まとめ
研究者は膜のトポロジーを逆転して オプシンを設計し 神経科学のための新しいツールを作りました このトポロジカル・エンジニアリングのアプローチは,強力な阻害剤として機能するチャネルロドプシン変種を生み出し,光遺伝的ツールキットを拡張しました.
科学分野:
- 神経科学
- 分子生物学
- バイオ物理学
背景:
- 神経活動の精密な操作は 脳の機能と行動を理解するために不可欠です
- 光感受性の微生物オプシンを用いた光遺伝学は,回路解剖に高い時間的精度を提供します.
- 既存のオプシンには選択性,運動性,スペクトルの性質の限界があり,新しいツールが必要である.
研究 の 目的:
- オプシン開発のための"トポロジックエンジニアリング"と呼ばれる新しいタンパク質エンジニアリング戦略を導入する.
- オプシン膜のトポロジーを逆転させることで 独特の機能特性を有する変種が得られることを証明する.
- 電気回路神経科学の研究のためのツールキットを拡張する.
主な方法:
- プラズマ膜内のオプシンを逆転させる"トポロジックエンジニアリング"アプローチを開発した.
- 膜のトポロジーを変えた新しいオプシン変種を作成し,特徴づけました.
- エンジニアリングされたオプシンの機能特性,その活動と運動をテストした.
主要な成果:
- トポロジカル・エンジニアリングは,異なる機能特性を有するオプシン・バリエーションを生成できることを実証した.
- チャネルロドプシン変種が,逆転時に活性化剤から迅速に作用する阻害剤に変容した具体的な例を示した.
- この反転したオプシンが カチオンポンプとして機能し 神経阻害の新たなモードを提供します
結論:
- 膜のトポロジーは,オプシンのタンパク質工学にとって価値のある正交的次元を表しています.
- トポロジックエンジニアリングは,光遺傳学的ツールキットの多様性と有用性を大幅に拡大します.
- このアプローチは 潜在的に神経科学の応用のための オプシンの数を倍増させることができます
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