アゴニスティックリガンドによって誘発されたトール型受容体8ジメルの構造的再編成
Hiromi Tanji1, Umeharu Ohto, Takuma Shibata
1Graduate School of Pharmaceutical Sciences, The University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-0033, Japan.
まとめ
リガンドによるトール型受容体8 (TLR8) の活性化が構造的に特徴づけられた. リンガンド結合はTLR8ジメルの再編成を誘導し,下流の先天性免疫シグナリングを可能にします.
科学分野:
- 免疫学 免疫学とは
- 構造生物学 構造生物学とは
- 分子生物学は分子生物学である.
背景:
- トール型受容体7 (TLR7) とトール型受容体8 (TLR8) は,先天性免疫に関与する重要なパターン認識受容体である.
- これらの受容体は単一鎖RNAを認識し,免疫反応を開始します.
- TLR7-TLR8を標的にする合成アゴニストは治療に有望であることが示されていますが,リガンド認識と活性化の分子機構は不明です.
研究 の 目的:
- ヒトのトール型受容体8 (TLR8) のリガンド認識と活性化の分子基礎を解明する.
- リガンド結合時にTLR8の構造変化と信号伝達における役割を決定する.
主な方法:
- 結晶構造の未結合と結合したヒトTLR8ジメルの結晶構造を決定した.
- 刺激時にTLR8ダイマーにおける構造的再配置の分析.
主要な成果:
- リンガンド認識は,2つのTLR8プロトマーによって形成された二分化インターフェイスで発生します.
- リガンド結合はTLR8二重体の重要な再編成を誘導し,C末端を近接させます.
- レウシンに富んだリピート14 (LRR14) とLRR15の間のループの割れ目が観察され,NとC末端の半分は関連付けられていました.
結論:
- リガンド結合はTLR8ジメルの構造変化を誘発し,下流シグナル伝達を促進する.
- 構造的再編成は,TLR8.8によって媒介される先天的な免疫応答の活性化に不可欠です.
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