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このページは機械翻訳されています。他のページは英語で表示される場合があります。View in English
  1. ホーム
  3. 研究分野
  5. 生物医学と臨床科学
  7. 腫瘍学とがん発生
  9. 分子標的
  11. オキシステロールに結合したヒトの冷凍-em構造 ヘトロトリメリックgiと結合したスムージング

オキシステロールに結合したヒトの冷凍-EM構造 ヘトロトリメリックGiと結合したスムージング

Xiaofeng Qi1, Heng Liu2, Bonne Thompson3

  • 1Department of Molecular Genetics, University of Texas Southwestern Medical Center, Dallas, TX, USA.

Nature
|June 7, 2019

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PubMed で要約を見る

まとめ
この要約は機械生成です。

研究者は,24,25-エポキシコレステロールをヘッジホッグ経路リガンドとして特定した. この発見は,Smoothened (SMO) がGタンパク質シグナル伝達と下流転写因子をどのように活性化するかを説明します.

科学分野:

  • 生物化学
  • 分子生物学
  • 細胞シグナリング

背景:

  • ヘッジホッグのシグナル伝達経路は,スムージド (SMO) Gタンパク質結合受容体 (GPCR) によって媒介される,発育と癌にとって極めて重要です.
  • SMOの活性化,パッチド-1 (PTCH1) との相互作用,およびGタンパク質結合のメカニズムはほとんど不明でした.
  • これらのプロセスを理解することは 病気の経路をターゲットにするために不可欠です

研究 の 目的:

  • ヘッジホッグ信号伝導の基礎にある分子メカニズムを解明する.
  • SMO活動を調節する内生リガンドを特定する.
  • SMOがヘトロトリメリックGタンパク質と相互作用し,下流信号伝達を活性化する方法を決定する.

主な方法:

  • ヒトSMOの構造を決定するために,冷凍電子顕微鏡 (cryo-EM) が使用されました.
  • Gタンパク質のシグナル伝達を in vitro で評価するために生化学的測定を行った.
  • PTCH1のための内生リガンドの識別

主要な成果:

  • 24,25-エポキシコレステロールは,PTCH1の内生リガンドとして特定され,ヘッジホッグ信号を刺激することができました.
  • クリオ-EM構造は,ヒトSMOに結合する24~25-エポキシコレステロールを,ヘトロトリメリックGiタンパク質との複合体で明らかにした.

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  • この構造は,SMOに対する新しいGi結合活性化メカニズムを明らかにし,クラスAのGPCRとは異なる.

    • 結論:

    • 24,25-エポキシコレステロールはヘッジホッグ経路の活性化における重要な分子です.
    • この研究は,F級GPCR (SMO) のGタンパク質結合と活性化に関する最初の構造的洞察を提供します.
    • この研究は,基本的な信号伝達に関する理解を深め,潜在的な治療目標を提供します.