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| タイトル | DEVELOPMENT OF A POTENT MONOCLONAL ANTIBODY FOR TREATMENT OF HUMAN METAPNEUMOVIRUS INFECTIONS. |
|---|---|
| ジャーナル・号・ページ | bioRxiv, Year 2025 |
| 掲載日 | 2025年7月20日 |
著者 | Evelyn D Harris / Morgan McGovern / Sara Pernikoff / Ren Ikeda / Lea Kipnis / William Hannon / Elizabeth B Sobolik / Matthew Gray / Alexander L Greninger / Sijia He / Chen-Ni Chin / Tong-Ming Fu / Marie Pancera / Jim Boonyaratanakornkit / ![]() |
| PubMed 要旨 | Human metapneumovirus (HMPV) is a major cause of respiratory infections, particularly among vulnerable populations, yet effective therapeutics remain unavailable. Monoclonal antibodies (mAbs) offer a ...Human metapneumovirus (HMPV) is a major cause of respiratory infections, particularly among vulnerable populations, yet effective therapeutics remain unavailable. Monoclonal antibodies (mAbs) offer a promising approach for both treatment and prevention. Here, we describe the discovery and characterization of 4F11, a highly potent and broadly neutralizing mAb with demonstrated in vitro and in vivo efficacy against HMPV. Using cryo-electron microscopy, we defined a unique mechanism of binding HMPV employed by 4F11, which distinguishes it from previously characterized RSV and HMPV mAbs. 4F11 targets an epitope located at the apex of the prefusion F protein (site Ø) with a 1:1 stoichiometry, distinct from the 3:1 stoichiometry observed with other HMPV site Ø antibodies. Unlike other site Ø antibodies, which penetrate the glycan shield between Asn57 and Asn172, 4F11 binds vertically and directly interacts with the Asn172 glycan, representing a unique glycan-dependent mode of recognition. In vitro, 4F11 displayed high potency and broad neutralization across diverse HMPV strains. It also showed a low propensity for resistance development, with only a single escape mutation (K179E) identified, a mutation not found in any published HMPV sequence to date. Viruses rescued with the K179E escape mutation had significantly decreased fitness in vitro compared to wild-type virus. In a hamster challenge model, 4F11 significantly reduced viral loads in both the lungs and nasal turbinates. These findings highlight 4F11 as a promising candidate for therapeutic development, particularly for immunocompromised individuals and other high-risk groups. |
リンク | bioRxiv / PubMed:40666860 / PubMed Central |
| 手法 | EM (単粒子) |
| 解像度 | 4.03 - 4.13 Å |
| 構造データ | EMDB-70773, PDB-9ore: ![]() EMDB-70774: CryoEM map of 4F11 and MxR Fabs bound to HMPV DS-CavEs2 preF monomer |
| 化合物 | ![]() ChemComp-NAG: |
| 由来 |
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キーワード | IMMUNE SYSTEM / HMPV / prefusion F / ANTIBODY / site 0 / glycan dependent |
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human metapneumovirus (ウイルス)
homo sapiens (ヒト)
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