バイアス細胞内アゴニストによる保存されたクラスBのGPCR活性化
Li-Hua Zhao1,2, Qian He3,4, Qingning Yuan3
1State Key Laboratory of Drug Research, Center for Structure and Function of Drug Targets, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, Shanghai, China. zhaolihuawendy@simm.ac.cn.
Nature
|July 31, 2023
まとめ
研究者らは,副甲状腺ホルモン1受容体 (PTH1R) を標的とする小分子薬の新しい結合部位を発見した. この発見は,クラスBのGタンパク質結合受容体 (GPCR) に対して口服可能な薬剤につながる可能性がある.
科学分野:
- 生物化学
- 構造生物学
- 薬理学について
背景:
- GLP1RとPTH1RのようなクラスBのGタンパク質結合受容体 (GPCR) は,重要な薬物標的である.
- ペプチド薬は存在しますが,これらの受容体に対する口服可能な小分子薬はまだ開発中です.
研究 の 目的:
- Gタンパク質と小分子アゴニストに結合したヒトPTH1Rの高解像度構造を決定する.
- 小分子アゴニストPCO371の結合方式とその薬剤設計への影響を解明する.
主な方法:
- GsとPCO371を複合したヒトPTH1Rの高解像度構造分析
- PCO371のアゴニスティック活動とシグナリングバイアスを評価する機能試験.
- PCO371結合保存を調査するために,PTH2RとGLP1Rのサイト指向型変異研究.
主要な成果:
- 小分子アゴニスト PCO371 の新しい結合部位は,Gs とのPTH1Rの細胞質界面で特定されました.
- この結合部位は,以前に知られているGPCR結合部位と有意に異なる.
- PCO371はGタンパク質バイアスアゴニストとして作用し,アストリンシグナル伝達よりもGsシグナル伝達を選択的に活性化します.
- PCO371結合ポケットに保存された残留物は,他のクラスBのGPCRを標的とする可能性を示唆する.
結論:
- PTH1Rの独特のPCO371結合部位の発見は,口服可能な小分子アゴニストの設計に新しい道を開く.
- この発見は,Gタンパク質のシグナル伝達を選択的に調節するバイアスアゴニストの開発を容易にし,治療の改善につながる可能性があります.
- 結合ポケットの保存された性質は,より広範なクラスBのGPCRをターゲットにするための有望な戦略を提供します.
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