ガン細胞と免疫細胞のFap2受容体との相互作用の構造的基礎
Felix Schöpf1,2, Gian L Marongiu1,2, Klaudia Milaj1,3
1Leibniz-Forschungsinstitut für Molekulare Pharmakologie (FMP), Berlin, Germany.
Nature communications
|August 29, 2025
まとめ
フゥソバクテリアム・ヌクレアトゥーム
科学分野:
- 微生物学
- 構造生物学
- 癌 研究
背景:
- Fusobacterium nucleatumは結腸直腸がんの進行と転移に関連しています.
- F. nucleatumのFap2アデシンは,がんと免疫細胞との相互作用を媒介する.
- Fap2が免疫細胞にTIGITを結合する正確なメカニズムは不明である.
研究 の 目的:
- FapとTIGITの相互作用の構造的基礎を明らかにする.
- Fap2 ががん細胞受容体 (Gal-GalNAc) と免疫細胞受容体 (TIGIT) に結合する特徴を特定する.
主な方法:
- 機能的なFap2の再結合表現は,Escherichia coliの表面で示される.
- 構造を決定するための冷凍電子顕微鏡 (Cryo-EM).
- 構造予測,ドッキング,分子ダイナミクスシミュレーション
主要な成果:
- E. coliで表される機能的Fap2は,高親和性でGal- GalNAcとTIGITを結合する.
- Cryo-EMは,Fap2の ~50 nmの細胞外領域が,その膜遠端でTIGITを結合することを明らかにします.
- Gal- GalNAcの特定の結合部位はFap2の先端で特定されました.
結論:
- Fap-TIGITの相互作用に関する構造的な洞察は,メカニズム的な理解を提供します.
- Fap2は,TIGITと相互作用する先端に,Gal-GalNAcのための明確な結合穴を使用しています.
- この研究は,大腸がんの治療においてFap2を標的とするための基礎を築いている.
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