トランスポートドメインの解錠は,アスパルテートトランスポーターの吸収率を設定します
Nurunisa Akyuz1, Elka R Georgieva2, Zhou Zhou1
1Department of Physiology and Biophysics, Weill Cornell Medical College, Cornell University, 1300 York Avenue, New York, New York 10065, USA.
Nature
|February 6, 2015
まとめ
グルタミン酸トランスポーターは,神経伝達物質をクリアします. この研究では,それらの視覚化が行われています.
科学分野:
- 構造生物学 構造生物学とは
- バイオケミストリー バイオケミストリー
- 神経科学は神経科学である.
背景:
- グルタミン酸トランスポーターは,神経伝達を終了させ,興奮毒性を予防するために不可欠です.
- 以前の結晶学的な研究では,GltPh.のトリメア構造の支架と移動する輸送領域が明らかになった.
- これらのトランスポーターによる基板転位のメカニズムは不明のままでした.
研究 の 目的:
- グルタミン酸トランスポータードメインのダイナミックな動きを直接観察する.
- 輸送領域の動態と基板の輸送速度との関係を確立する.
- トランスポーターダイナミクスとメカニズムに対する"人間化"変異の影響を調査する.
主な方法:
- 単分子光共振エネルギー転送 (smFRET) イメージング.
- プロテオリポソームを精製されたGltPhで再構成する.
- 生理学的イオングラデーションを利用する.
- クリスタログラフィと計算分析.
主要な成果:
- GltPh.で"エレベーターのような"輸送領域の動きの直接視覚化.
- 変異した GltPh (ヒトの特徴を持つ) は,ドメインのダイナミクスの増加を示した.
- ダイナミクスの増加は,基板輸送速度の向上と直接相関していた.
- 変異は解錠された中間状態を好み,溶媒の曝露が増加した.
結論:
- 輸送ドメインのダイナミクスは,グルタミン酸トランスポーターにおける基板転位と直接結合しています.
- "人間化する"変異は,ダイナミックでロック解除された状態を促進することによって,トランスポーター効率を高めます.
- これは,神経伝達物質の輸送における構造,ダイナミクス,および機能の間のメカニズム的なリンクを提供します.
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