粘着GPCRsADGRD1とADGRF1の結合アゴニズムの構造的基礎
Xiangli Qu1,2, Na Qiu1,2, Mu Wang1,3
1CAS Key Laboratory of Receptor Research, State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, Shanghai, China.
Nature
|April 14, 2022
まとめ
粘着Gタンパク質結合受容体 (aGPCRs) は,割れではなく,結合した茎領域で活性化します. 構造的研究は,保存された茎-トランスメブラン相互作用とADGRF1の脂質結合部位を明らかにし,aGPCRのシグナリングの複雑さを明らかにした.
科学分野:
- 生物化学
- 分子生物学
- 構造生物学
背景:
- 粘着Gタンパク質結合受容体 (aGPCRs) は生理学的プロセスに不可欠ですが,その活性化メカニズム,特に結合性アゴニズムについてはほとんど理解されていません.
- 以前の仮説では,N末端領域に結合したアゴニストを含む内在的な活性化が示唆されていたが,分子詳細は不明であった.
研究 の 目的:
- ADGRD1とADGRF1のGタンパク質結合構造を決定することによって,aGPCR活性化の分子メカニズムを解明する.
- aGPCRにおける茎領域と潜在的分裂独立活性化経路の役割を調査する.
- リピド結合ポケットのようなaGPCR内の機能的部位を特定し,リガンド認識に潜在的に関与する.
主な方法:
- クリオ電子顕微鏡やX線結晶学を用いたADGRD1とADGRF1のGタンパク質結合構造の決定
- 異なるaGPCRにおける茎領域とトランスメブラン領域間の保存された相互作用の分析.
- 脂質結合部位を含む,特定された構造的特徴の機能的重要性を評価するための生化学的測定.
主要な成果:
- ADGRD1とADGRF1の茎領域は,結合アゴニストとして作用し,保存された方法でトランスメブラン領域と広範に相互作用します.
- 自体解剖に欠陥のあるADGRF1変異体の構造分析は,分裂独立の活性化メカニズムを支持する.
- ヘリックス間の相互作用の保存されたカスケードは,配列の変動が観察され,茎誘発活性化を促進します.
- ADGRF1の特定の細胞内脂質結合部位が特定され,機能的に重要な,潜在的にシナプタミドを結合することが示された.
結論:
- ストーク-トランスメブラン領域の相互作用は,aGPCRsの共通の活性化メカニズムを表しています.
- aGPCRの活性化は,自体タンパク質分解とは無関係に発生し,茎に誘発された形状の変化によって媒介される.
- 特定されたADGRF1の脂質結合部位は,aGPCRファミリーにおける新しい信号伝達とリガンド認識を示唆している.
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