ニューロテンシン受容体1とβ-アレスティン1の複合体の構造
Weijiao Huang1, Matthieu Masureel1, Qianhui Qu1,2
1Department of Molecular and Cellular Physiology, Stanford University School of Medicine, Stanford, CA, USA.
Nature
|January 17, 2020
まとめ
研究者は,Gタンパク質結合受容体 (GPCRs) を誘発するアステンの構造的基礎を明らかにした. 凍結EM構造は,リン酸化ニューロテンシン受容体1 (NTSR1) がベータアレスティン1と結合する方法を明らかにし,保存された相互作用とプラスティック相互作用を強調する.
科学分野:
- 構造生物学
- 分子薬理学
- セル・シグナル
背景:
- アレスティンタンパク質は,Gタンパク質結合を阻害し,受容体内化を開始することによって,Gタンパク質結合受容体 (GPCRs) を調節する.
- GPCR-Gタンパク質の相互作用は十分に研究されているが,アレスチン-GPCRの関与の構造的メカニズムは理解されていない.
研究 の 目的:
- アストリンに結合した酸化GPCRの高解像度構造を決定する.
- アレスティン-GPCR複合体の形成の分子詳細を明らかにし,重要な相互作用部位を特定する.
主な方法:
- クリオ電子顕微鏡 (cryo-EM) を用いて,ヒトの全長ニューロテンシン受容体1 (NTSR1) の構造を決定し,ヒトの切断されたβ-アレスティン1 (βarr1 ((ΔCT)) と複合させた.
主要な成果:
- NTSR1のリン酸化は,βarr1 ((ΔCT)) との安定した複合体の形成に不可欠である.
- NTSR1の細胞内ループとC端における特定のリン酸化部位は,潜在的な相互作用媒介体として特定された.
- フォスファチチドリノシトール-4,5-ビスホスファートの分子がNTSR1とβarr1 ((ΔCT) を橋渡ししていることが観察されました.
- 凍結EM構造は,他のアストリン受容体複合体と比較して,アストリン受容体に対する約85°の回転を示し,可塑性を示した.
結論:
- この研究は,アストリンがリン酸化GPCR,特にNTSR1に結合する構造的基礎を提供する.
- GPCR信号調節の理解に不可欠なアリストリン-GPCR相互作用の保存と適応性の特徴を明らかにした.
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