κ-オピオイド受容体におけるリガンドとGタンパク質の選択性

Jianming Han^1,2, Jingying Zhang^3,4,5,6, Antonina L Nazarova^7,8,9

¹Department of Anesthesiology, Washington University in St Louis, St Louis, MO, USA.

Nature

|May 3, 2023

まとめ

κ-オピオイド受容体 (KOR) は痛みと中毒の標的ですが,副作用は問題です. 新しい構造は,KORが異なるGタンパク質とどのように相互作用するかを明らかにし,より安全なKOR標的薬の開発を導く.

科学分野:

神経科学
分子生物学
薬理学について

背景:

κ-オピオイド受容体 (KOR) は,痛み,中毒,感情障害の治療における重要な標的である.
KORを標的とする治療法の開発は幻覚を引き起こす副作用によって制限されています
KORシグナル伝達にはG_i/o族のタンパク質 (G_i1,G_i2,G_i3,G_oA,G_oB,G_z,G_g) が含まれるが,その特定の役割とサブタイプ選択性は不明である.

研究の目的:

様々なG_i/oファミリーのサブタイプとの相互作用の構造的基礎を解明する.
KORリガンドの選択性とGタンパク質のサブタイプ選択性の基礎となる分子機構を理解する.
改善された治療プロファイルを持つ経路選択的 KOR アゴニストの設計のための基盤を提供すること.

主な方法:

クリオ電子顕微鏡 (cryo-EM) を用いて,KORの活性状態構造を決定した.
KOR構造は,G_i1,G_oA,G_z,およびG_gヘテロトリマーで複合的に解明されました.
複合体は幻覚を誘発するサルビノリンや選択的 KOR アゴニストと結合した.

主要な成果:

4つの異なるGタンパク質サブタイプ (G_i1,G_oA,G_z,G_g) に結合したKORの詳細な構造が得られた.
KOR- Gタンパク質相互作用とGタンパク質亜型選択性を支配する分子決定因子を特定した.
4つのGタンパク質サブタイプ間の結合親和性とアロステリック活性における差異が観察されました.

結論:

この研究は,KOR-Gタンパク質の結合特異性とリガンドの選択性に関する重要な洞察を示しています.
構造的なデータは KORにおける幻覚剤の作用を理解するための基礎を提供します.
副作用を軽減し,治療の可能性を高めるために,経路選択的な KOR アゴニストの開発の道を開く.

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