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| タイトル | Neutralization of SARS-CoV-2 by IgM-14 via engagement of two distinct spike epitopes. |
|---|---|
| ジャーナル・号・ページ | PLoS Pathog, Vol. 22, Issue 3, Page e1014071, Year 2026 |
| 掲載日 | 2026年3月25日 |
著者 | Yan Wang / Yanping Hu / Zhiqiang Ku / Jason Yeung / Jing Zou / Michael Woodson / Nikolai S Prokhorov / Ekaterina S Knyazhanskaya / Haiqing Zhao / Michael B Sherman / Zhiqiang An / Stephen F Carroll / Pei-Yong Shi / Petr G Leiman / Xuping Xie / ![]() |
| PubMed 要旨 | Engineered immunoglobulin M (IgM) antibodies typically exhibit superior neutralization potency and avidity compared to their parental IgG counterparts, primarily due to multivalent binding to ...Engineered immunoglobulin M (IgM) antibodies typically exhibit superior neutralization potency and avidity compared to their parental IgG counterparts, primarily due to multivalent binding to repeated epitopes on a targeting antigen. In this study, we characterize the neutralization breadth and mechanism of action of IgM-14, a previously reported intranasally deliverable antibody targeting SARS-CoV-2. IgM-14 demonstrates remarkably potent antiviral activity against all pre-Omicron variants but significantly reduced efficacy against Omicron BA.1, and complete loss of activity against the later subvariant JN.1. Resistance selection identified two key mutations in the receptor-binding domain (RBD), G476D and F486P, which disrupt IgM-14 binding and confer strong resistance. Cryo-electron microscopy analysis uncovered two distinct Fab-RBD interfaces: a primary interface overlapping the angiotensin-converting enzyme 2 (ACE2)-binding region, and a unique secondary interface formed only when the RBD adopts the ACE2-inaccessible "down" conformation, involving a neighboring spike protomer. Site-directed mutagenesis and structural modeling revealed a critical role of this secondary site in IgM-14-mediated neutralization. Unlike IgG-14, structural modeling suggested that IgM-14 can simultaneously engage both interfaces in diverse modes, indicating a noncanonical avidity mechanism. Collectively, these findings highlight the structural and functional uniqueness of IgM-14 and offer valuable insights into the rational design of next-generation spike-targeted antibody therapeutics with enhanced breadth and potency. |
リンク | PLoS Pathog / PubMed:41880376 / PubMed Central |
| 手法 | EM (単粒子) |
| 解像度 | 3.01 - 4.1 Å |
| 構造データ | EMDB-73228, PDB-9ynr: ![]() EMDB-73231: Cryo-EM map of D614G spike, 1-up-RBD ![]() EMDB-73244: SARS-CoV-2 D614G spike, 3-RBD-downn EMDB-73245, PDB-9ynx: ![]() EMDB-73247: Fab-14/SARS-CoV-2 D614G spike complex, Mode V conformation EMDB-73260, PDB-9yok: ![]() EMDB-73263: Fab-14/SARS-CoV-2 D614G spike complex, Mode II, subgroup I conformation ![]() EMDB-73265: Fab-14/SARS-CoV-2 D614G spike complex, Mode II, subgroup II conformation ![]() EMDB-73267: Fab-14/SARS-CoV-2 D614G spike complex, Mode II, subgroup III conformation ![]() EMDB-73270: Fab-14/SARS-CoV-2 Omicron BA.1 spike complex ![]() EMDB-73271: SARS-CoV-2 Omicron BA.1 spike, 3-RBD-down ![]() EMDB-73273: SARS-CoV-2 Omicron BA.1 spike, 1-RBD-up ![]() EMDB-73290: Fab-14/SARS-CoV-2 D614G spike complex, Mode III conformation ![]() EMDB-73291: Unbound SARS-CoV-2 D614G spike EMDB-73292, PDB-9ypb: EMDB-73306, PDB-9ypr: |
| 化合物 | ![]() ChemComp-NAG: |
| 由来 |
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キーワード | VIRAL PROTEIN / SARS-CoV-2 / neutralizing antibody / neutraling antibody / neutralizing anbitody |
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