K2P2.1 (TREK-1) -アクティベーター複合体は,神秘的な選択性フィルター結合部位を明らかにする
Marco Lolicato1, Cristina Arrigoni1, Takahiro Mori2
1Cardiovascular Research Institute, University of California, San Francisco, California 941158-9001, USA.
Nature
|July 11, 2017
まとめ
研究者らは,TREK チャンネルを安定させることで活性化する小さな分子を発見しました.
科学分野:
- 神経科学
- 構造生物学
- 薬理学について
背景:
- 二孔ドメインのカリウム (K2P) チャンネル,特にTREKサブファミリーは,ニューロンの興奮性と感覚知覚を調節する.
- これらの経路は 痛みや気温の感覚や 麻酔反応に関与しています
- 現在,K2Pチャネルメカニズムの理解は,効果的な薬理学的ツールの欠如によって制限されています.
研究 の 目的:
- TREKサブファミリーチャネルを活性化する小分子を特定し,特徴づけること.
- K2Pチャネルの小分子活性化の構造的基礎を解明する.
- K2Pチャネル機能を研究するための新薬学的探査機を提供すること.
主な方法:
- K2P2.1 (TREK-1) の構造を単独およびアクティベーターML335およびML402との複合で決定するために,X線結晶学を使用した.
- 小分子への反応としてチャネル活動を評価するために,機能的電気生理学アッセイが行われました.
- 結合相互作用を理解するために,構造に基づく薬剤設計の原則が適用されました.
主要な成果:
- TREKチャネルのための新種の小分子活性化剤 (ML335およびML402) が特定されました.
- 他のイオンチャネルサイトとは異なる 独特の暗号結合ポケットを明らかにしました
- これらのアクティベータは分子として機能し,カチオン-π相互作用によって"漏れモード"のC型ゲートを安定させます.
結論:
- C型ゲートの安定化を可能にする,K2Pチャネルにおける薬物ゲーブル結合部位が特定された.
- これらの発見は,K2Pチャネルの選択性フィルターゲートの直接的な証拠を提供します.
- 発見されたアクティベーターは,K2Pチャネル生理学と薬理学の将来の研究に貴重なツールを提供します.
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