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孤児GPR52のリガンド認識と自己活性化の構造的基礎

Xi Lin^1,2,3,4, Mingyue Li^2,3,4, Niandong Wang^1,2,3,4

¹iHuman Institute, ShanghaiTech University, Shanghai, China.

|February 21, 2020

まとめ

Gタンパク質結合受容体52 (GPR52) は,内部メカニズムによって活性化され,Gsタンパク質と結合すると,完全な機能のために外部リガンドを必要としない. この発見は自己活性化受容体を理解し,神経疾患の薬剤発見に役立つ.

科学分野:

構造生物学
神経科学
薬理学について

背景:

Gタンパク質結合受容体52 (GPR52) は,ハンティントン病および精神疾患に関与する脳発現の孤児受容体である.
GPR52のシグナル伝達は主にGsタンパク質に関係しているが,その正確な結合メカニズムと活性化要件は不明である.

研究の目的:

GPR52の活性化とGsタンパク質の結合の構造的基礎を解明する.
GPR52機能における細胞外ループと潜在的結合部位の役割を調査する.

主な方法:

複数の状態でのヒトGPR52の高解像度構造的決定 (リガンドフリー,Gs結合,リガンド結合).
受容体とタンパク質の相互作用の分析と活性化に関わる主要な構造的特徴の特定.

主要な成果:

細胞外ループ2は固有アゴニストとして作用し,オーステリック結合ポケットを占め,高い基礎活性を与える.
GPR52は,外部アゴニストとは関係なく,Gsカップリングで完全な活性化を達成します.
異なった側面のポケットは,アロステリックリガンドの結合の可能性を示唆する.

結論:

GPR52は自己活性化を示し,細胞外ループ2が重要な役割を果たします.
この発見は,自己活性化GPCRを理解するための構造的枠組みを提供する.
この研究は,神経学的および精神的疾患に対するGPR52を標的とした新しい治療法の開発を導くことができます.

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