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SARS-CoV-2受容体結合領域の抗原構造
Wanwisa Dejnirattisai1, Daming Zhou2, Helen M Ginn3
1Wellcome Centre for Human Genetics, Nuffield Department of Medicine, University of Oxford, Oxford OX3 7BN, UK.
Cell
|March 23, 2021
まとめ
研究者は,SARS-CoV-2を標的とするヒト単一クローン抗体 (mAbs) を377個特定した. 非常に効果的な中和抗体は主にウイルスの侵入を阻害し,一部の抗体は動物モデルで保護効果を示しています.
科学分野:
- 免疫学
- ウイルス学
- 構造生物学
背景:
- 抗体はSARS-CoV-2に対する免疫防御に不可欠です.
- モノクローナル抗体 (mAbs) は治療薬として研究されている.
- SARS-CoV-2のスパイクタンパク質への抗体結合を理解することは極めて重要です.
研究 の 目的:
- SARS-CoV-2のスパイクタンパク質,特に受容体結合領域 (RBD) を標的とするヒト単一クローン抗体を特定し,特徴づけること.
- RBDの抗体結合部位をマップし,中和化の構造的基礎を分析する.
- 強力な中和抗体の保護効果を臨床前モデルで評価する.
主な方法:
- SARS-CoV-2のスパイクタンパク質に対する377個のヒト単一クローン抗体の識別とスクリーニング.
- RBDのバインディングサイトをマッピングするための競争データベースの方法の開発.
- 19のファブ抗原複合体のX線結晶学と冷凍電子顕微鏡を用いた構造分析.
主要な成果:
- RBDに結合する80の抗体が特徴付けられ,高度に中和するmAbsの間で焦点を合わせた結合部位がある.
- 最も強力な中和mAbsはウイルスの受容体相互作用を阻害し,そのうちの1つはユニークなN末端ドメインエピトープを標的にすることを特定しました.
- 構造分析により,強力な中和抗体に対する新しい結合モードが明らかになった.
結論:
- SARS-CoV-2に対する高度に効果的な中和性モノクローナル抗体は,主にRBDを標的とし,ウイルスの侵入を阻害する.
- 多くの強力な中和抗体は一般的なV遺伝子を利用し,細菌系に近いので,広範な適用の可能性を示唆する.
- mAbsの強い中和は,動物モデルでの予防と治療の保護を示し,その治療の可能性を裏付けました.
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