トール型受容体3が二重鎖RNAで信号を送る構造的基礎
Lin Liu1, Istvan Botos, Yan Wang
1Laboratory of Molecular Biology, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, MD 20892, USA.
まとめ
トール型受容体3 (TLR3) は,そのエクトドメインの2つのサイトを使用して,ウイルスの二重鎖RNA (dsRNA) を結合します. この結合はダイマーを安定させ,ウイルスの感染と戦うために潜在的に炎症シグナリングを開始します.
科学分野:
- 免疫学 免疫学とは
- 構造生物学 構造生物学とは
- ウイルス学 ウイルス学 ウイルス学
背景:
- トール型受容体3 (TLR3) は,先天的免疫に不可欠であり,ウイルスの二重鎖RNA (dsRNA) を認識します.
- TLR3の活性化は,ウイルスの拡散を制御するために不可欠な炎症反応を誘発します.
- 信号伝導には,dsRNA上のTLR3エクトドメイン (ECD) の二分化が必要である.
研究 の 目的:
- TLR3.3によるdsRNA結合の分子メカニズムを解明する.
- dsRNA結合がTLR3の二分化とシグナル伝達をどのように誘導するかを理解する.
- TLR3-dsRNA相互作用の構造的基礎を決定する.
主な方法:
- マウスのTLR3-ECDsが dsRNA.complexedで結晶構造を決定した.
- 高解像度 (3.4アングストーム) 構造分析.
主要な成果:
- 結晶構造は,各TLR3-ECDの2つのdsRNA結合部位を明らかにし,それらは,馬形エクトドメインの反対端に位置しています.
- TLR3-ECD C端末ドメインの間の分子間接触は,dsRNA結合時に二重体を安定させます.
- TLR3-ECDの全体的な形状は,dsRNA結合後も変わらない.
結論:
- 構造データは,dsRNA認識とTLR3エクトドメイン二分化のための分子基盤を提供します.
- dsRNA結合によって媒介されるTLR3二酸化は,細胞質のTIRドメイン経由で下流信号伝達の促進を提案されています.
- この研究は,TLR3.3によるウイルスの認識の初期のイベントについての洞察を提供します.
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