J2モノクローナル抗体による二本鎖RNA認識の構造的基盤
Charles Bou-Nader1, Kevin M Juma1, Ankur Bothra2
1Laboratory of Molecular Biology, National Institute of Diabetes and Digestive and Kidney Diseases, Bethesda, MD, USA.
Nature communications
|December 13, 2025
まとめ
J2抗体は、二本鎖RNA(dsRNA)のマイナ—グルーブを追跡することでdsRNAを認識し、強い結合には少なくとも14塩基対が必要である。この構造的洞察は、研究および治療用途におけるdsRNA検出を明確にする。
科学分野:
- 免疫学
- 構造生物学
- 分子生物学
背景:
- 二本鎖RNA(dsRNA)は、細胞プロセス、ウイルス感染、および免疫応答において重要である。
- J2モノクローナル抗体は、dsRNAの検出およびマッピングのための重要なツールである。
研究 の 目的:
- J2抗体のエピトープ、特異性、および結合メカニズムを解明すること。
- J2がdsRNAと分子レベルでどのように相互作用するかを理解すること。
主な方法:
- dsRNAとJ2抗原結合フラグメント(Fab)複合体の共結晶構造を2.85 Å解像度で決定した。
- dsRNAの長さおよび配列組成を含む結合要件を解析した。
主要な成果:
- J2抗体は、dsRNAのマイナ—グルーブを追跡することでdsRNAに結合し、8塩基対(bp)のずれた二重らせんを認識する。
- J2はdsRNAに対して高い選択性を示し、堅牢な結合には≥14bpを必要とし、GCリッチなdsRNAに対しては親和性が低下する。
- J2は、細胞内のdsRNA結合タンパク質とは異なる、S9.6抗体と明確な認識戦略を共有する。
結論:
- 本研究は、J2抗体を介したdsRNA認識のメカニズムに関する洞察を提供する。
- RNA検出およびサーベイランスにおけるJ2抗体データの正確な適用および解釈のためのフレームワークを確立する。
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