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-Structure paper
| タイトル | Cryo-EM structures of anti Z-DNA antibodies in complex with antigen reveal distinct recognition modes of a left-handed geometry. |
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| ジャーナル・号・ページ | bioRxiv, Year 2025 |
| 掲載日 | 2025年12月12日 |
著者 | Danielle Chin / Yongbo Luo / Yiteng Lau / Nivedita Dutta / Zengyting He / Chaoran Yin / Riley M Williams / Siddharth Balachandran / Quentin Vicens / Peter Dröge / Dahai Luo |
| PubMed 要旨 | Double-stranded nucleic acids can undergo transitions from canonical B/A-forms to alternate left-handed Z-DNA/Z-RNA (Z-NAs). Z-NAs are implicated in processes such as neuroinflammation in Alzheimer's ...Double-stranded nucleic acids can undergo transitions from canonical B/A-forms to alternate left-handed Z-DNA/Z-RNA (Z-NAs). Z-NAs are implicated in processes such as neuroinflammation in Alzheimer's disease, Lupus Erythematosus, microbial biofilms, and type I interferon-mediated human pathologies. Since endogenous Z-NA sensors like the Zα domain can induce B-to-Z transitions, monoclonal antibodies (mAbs) Z-D11 and Z22 have been regarded as conformation-specific tools to confirm Z-NA , although high-resolution structural information is missing. Here, we employed single-particle cryo-electron microscopy to solve structures of Z-D11 and Z22 bound to synthetic d(CG) 12mer Z-DNA duplex. Both mAbs form filamentous trimers around the Z-DNA axis, further stabilized by Fab-Fab interactions. The mAbs achieve specificity through extensive contacts to both Z-form backbone strands and the exposed guanine/cytosine bases in the major groove. This mode of recognition is dictated by shape complementarity rather than sequence specificity, sensing the alternating syn/anti backbone torsions and the phosphate zig-zag geometry unique to Z-DNA. Our data also suggest that these mAbs are not inducing B-to-Z transitions under normal physiological conditions. Finally, comparison to other double-stranded NA-binding mAbs defines a similar structural logic adapted to different helical geometry recognition patterns, thus providing a framework for engineering highly specific nucleic acid probes. |
リンク | bioRxiv / PubMed:41415447 / PubMed Central |
| 手法 | EM (単粒子) |
| 解像度 | 2.55 - 2.8 Å |
| 構造データ | EMDB-55905, PDB-9tgn: EMDB-55906, PDB-9tgo: EMDB-55912, PDB-9tgw: |
| 化合物 | ![]() ChemComp-MG: ![]() ChemComp-HOH: |
| 由来 |
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キーワード | DNA BINDING PROTEIN / Z-DNA / monoclonal antibody / left-handed geometry / antibody avidity |
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