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-Structure paper
| タイトル | Human Coronavirus HKU1 Neutralizing Monoclonal Antibodies Target Diverse Epitopes Within and Around the TMPRSS2 Receptor Binding Site. |
|---|---|
| ジャーナル・号・ページ | bioRxiv, Year 2025 |
| 掲載日 | 2025年10月30日 |
著者 | Lingshu Wang / Jeswin Joseph / Sheena Vasquez / Daniel Wrapp / Timothy P Sheahan / Christian K O Dzuvor / Osnat Rosen / Robert N Kirchdoerfer / Olubukola M Abiona / Catherine Hammond / Wei Shi / Sydney P Moak / Wing-Pui Kong / Yi Zhang / Michael R Eso / Ariane J Brown / Andrew B Ward / Ralph Baric / Jason S McLellan / Theodore C Pierson / John Mascola / Barney S Graham / Hadi M Yassine / Christopher O Barnes / Kizzmekia S Corbett-Helaire / ![]() |
| PubMed 要旨 | Endemic human coronaviruses (HCoVs), like HCoV-HKU1, account for ~30% of common cold/year and can cause serious upper and lower respiratory infections, yet no licensed vaccines target HCoVs. In fact, ...Endemic human coronaviruses (HCoVs), like HCoV-HKU1, account for ~30% of common cold/year and can cause serious upper and lower respiratory infections, yet no licensed vaccines target HCoVs. In fact, little is known about HCoV-HKU1's antigenic landscape. Thus, we characterized key interactions between HCoV-HKU1 spike (S) with monoclonal antibodies (mAbs) isolated from pre-pandemic HCoV-HKU1 convalescent PBMCs. We isolated 14 mAbs, which bound distinct S regions: receptor binding domain (RBD), N-terminal domain (NTD), and S2 subunit. Structural and functional studies revealed three groups of RBD-specific mAbs targeting diverse footprints within and around the TMPRSS2 receptor binding site, exemplified by: (1) The most potently neutralizing mAb, H501-022 (IC = 0.01 μg/mL), which recognizes the TMPRSS2 binding motif, thereby blocking receptor engagement; (2) mAb H501-008 (IC = 0.05 μg/mL) that binds a conserved, cross-reactive epitope outside of the TMPRSS2 binding site that is shared with HCoV-OC43; and (3) H501-018 (IC = 0.28 μg/mL) that recognizes both "up" and "down" RBD conformations at a distinct, non-overlapping site outside of the TMPRSS2 binding motif, distinguishing itself from H501-022 and H501-008, which bind exclusively to the "up" RBD conformation. These mAbs represent the first type-specific HCoV-HKU1 mAbs isolated from a convalescent donor. Our findings provide molecular insight into HCoV-HKU1 antibody recognition and neutralization mechanisms, importantly highlighting antigenic differences comparing HCoVs and pandemic CoVs - a critical step towards advancing universal CoV vaccine design. |
リンク | bioRxiv / PubMed:41279056 / PubMed Central |
| 手法 | EM (単粒子) / X線回折 |
| 解像度 | 2.6 - 4.1 Å |
| 構造データ | ![]() EMDB-72934: HCoV-HKU1 C S 2P in complex with H501-008 Fab (global cryoEM) EMDB-72935, PDB-9ygn: EMDB-72936, PDB-9ygo: EMDB-72937, PDB-9ygp: EMDB-72938, PDB-9ygq: EMDB-72939, PDB-9ygr: ![]() PDB-9yxw: |
| 化合物 | ![]() ChemComp-NAG: ![]() ChemComp-HOH: |
| 由来 |
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キーワード | VIRAL PROTEIN/IMMUNE SYSTEM / coronavirus / HKU1 / mAb / cryoEM / VIRAL PROTEIN / VIRAL PROTEIN-IMMUNE SYSTEM complex / Spike / HCoV-HKU1 / antibody / Fab |
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human coronavirus hku1 (ウイルス)
homo sapiens (ヒト)
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