プレフュージョン形状における2019-nCoVのスパイクの冷凍-EM構造
Daniel Wrapp1, Nianshuang Wang1, Kizzmekia S Corbett2
1Department of Molecular Biosciences, The University of Texas at Austin, Austin, TX 78712, USA.
Science (New York, N.Y.)
|February 21, 2020
まとめ
新型コロナウイルス (2019-nCoV) の構造は,そのスパイクタンパク質がSARS-CoVよりも高い親和性でACE2と結合することを明らかにしています. この構造的な洞察は,2019nCoVのパンデミックに対する効果的なワクチンと治療法の開発に不可欠です.
科学分野:
- ウイルス学
- 構造生物学
- 免疫学
背景:
- 2019-nCoVの流行は,世界的な健康上の重大な脅威となっている.
- コロナウイルスのスパイク (S) グリコプロテインは,医療対策の重要なターゲットです.
- Sタンパク質の構造と機能を理解することは,パンデミック対策に不可欠です.
研究 の 目的:
- 2019-nCoV Sトリマーの高解像度構造を決定する.
- 2019-nCoV S とヒト ACE2 の結合相互作用を調査する.
- 2019-nCoV と SARS-CoV の間の潜在的な抗体の交叉反応性を評価する.
主な方法:
- クリオ電子顕微鏡 (cryo-EM) を用いて3. 5アングストロムの解像度でSトリマー構造を決定した.
- 2019-nCoV SのACE2への結合 afinityを分析するために,生体物理的方法を使用した.
- SARS-CoV RBD特異のモノクローナル抗体を用いて結合測定を行った.
主要な成果:
- プレフュージョン形状における2019-nCoV Sトリマーの3. 5アングストロムの冷凍-EM構造が決定された.
- 主要な状態は,受容体アクセシブルな形状で1つの受容体結合領域 (RBD) を示した.
- 2019-nCoV Sは,SARS-CoV Sよりも高い親和性でヒトのアンジオテンシン変換酵素2 (ACE2) に結合する.
- 公開されたSARS-CoV RBD特異のモノクローナル抗体は,2019-nCoV Sに限定的結合を示した.
結論:
- 2019-nCoV Sタンパク質の決定された構造は,医学的な対抗策の開発のための基礎を提供します.
- ACE2へのより高い結合親和性は,効率的なウイルス侵入の潜在的なメカニズムを示唆する.
- 限られた抗体の交叉反応性は,2019-nCoVに対する特定の治療戦略の必要性を示しています.
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