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-Structure paper
| タイトル | IgX informs engineering strategies of IgM and IgG hexamers. |
|---|---|
| ジャーナル・号・ページ | Sci Adv, Vol. 11, Issue 45, Page eaea3737, Year 2025 |
| 掲載日 | 2025年11月7日 |
著者 | Ruixue Zhang / Chenggong Ji / Shuhan Li / Ningning Li / Ning Gao / Junyu Xiao / ![]() |
| PubMed 要旨 | Polymeric immunoglobulins are essential components of the immune system in jawed vertebrates. While mammalian immunoglobulin M (IgM) typically forms a pentamer linked by the joining chain (J-chain), ...Polymeric immunoglobulins are essential components of the immune system in jawed vertebrates. While mammalian immunoglobulin M (IgM) typically forms a pentamer linked by the joining chain (J-chain), IgX can assemble into a J-chain-independent polymer. Here, we present the cryo-electron microscopy (cryo-EM) structure of IgX, revealing its hexameric configuration. By incorporating the IgX tailpiece into human IgM, we achieved efficient IgM hexamer formation. Truncating IgM's natural tailpiece to a range of 11 to 16 residues also substantially enhanced hexamerization efficiency. Furthermore, introducing a shortened IgM tailpiece to IgG resulted in effective IgG hexamer formation. We further show that the engineered IgM and IgG hexamers targeting CD20 demonstrated robust complement-dependent cytotoxicity (CDC) against several B lymphoma cells. In addition, the IgG-Fc hexamer functioned as a decoy, attenuating CDC in cell cultures. These findings deepen our understanding of polymeric immunoglobulin evolution and introduce innovative strategies for the development of IgM- and IgG-based biologics. |
リンク | Sci Adv / PubMed:41191733 / PubMed Central |
| 手法 | EM (単粒子) |
| 解像度 | 2.75 - 3.29 Å |
| 構造データ | EMDB-64371, PDB-9uo3: EMDB-64372, PDB-9uo4: EMDB-64373, PDB-9uo5: EMDB-64375, PDB-9uo6: |
| 由来 |
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キーワード | IMMUNE SYSTEM / Complex / polymeric antibody |
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