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粘着性GPCRの結合ペプチド活性化メカニズム ADGRG2とADGRG4
Peng Xiao1,2,3, Shengchao Guo3, Xin Wen3
1Department of Clinical Laboratory, The Second Hospital, and Advanced Medical Research Institute, Cheeloo College of Medicine, Shandong University, Jinan, China.
Nature
|April 14, 2022
まとめ
粘着Gタンパク質結合受容体 (aGPCRs) は,凍結EM構造によって明らかにされた,結合されたスタッケル配列を通じて活性化されます. このメカニズムは,これらの古代受容体の新しいペプチドアゴニストとアンタゴニストの設計に情報を与えます.
科学分野:
- 構造生物学
- 分子細胞生物学
- 生物化学
背景:
- 粘着Gタンパク質結合受容体 (aGPCR) は,古代の細胞表面受容体である.
- aGPCRはしばしば自己タンパク質分解を行い,アルファおよびベータサブユニットを生成する.
- ベータサブユニットのスタケル配列による結合性アゴニズムはaGPCRの活性化に関与しています.
研究 の 目的:
- 縛られたスタッケル配列によって媒介されるaGPCRの構造的基礎を解明する.
- Stachel配列と7つのトランスメブラン (7TM) ドメインの相互作用を調査する.
- GPCRを標的にするペプチドアゴニストとアンタゴニストの合理的な設計のための洞察を提供する.
主な方法:
- 3つの冷凍電子顕微鏡 (冷凍EM) 構造が決定された.
- 構造には,Gsヘテロトリマーで複合したaGPCR (ADGRG2,ADGRG4) が含まれていた.
- 複合体は内生的なスタケル配列または合成ペプチドアゴニスト (IP15) を含む.
主要な成果:
- クリオ-エム構造は7TMバンドルに深く挿入されたU形のスタッケル配列を明らかにします.
- Stachel配列の FXφXφXφモチーフは,受容体の結合と活性化を媒介する"指"として作用する.
- ADGRG2 ((FL) -IP15-Gsの構造は,IP15の強化された結合親和性を説明し,アゴニストの設計を導く.
- "指の残留物"を改変することによってペプチドアンタゴニストを生成する方法が開発された.
結論:
- 構造的および生化学的なデータは,aGPCRの結合活性化メカニズムに関する重要な洞察を提供します.
- この発見は,aGPCRsのペプチドベースのアゴニストとアンタゴニストの合理的な設計を容易にする.
- この研究は,GPCRのシグナル伝達と治療の可能性の理解を深める.
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