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-Structure paper
| タイトル | Evolution-guided protein design of IscB for persistent epigenome editing in vivo. |
|---|---|
| ジャーナル・号・ページ | Nat Biotechnol, Year 2025 |
| 掲載日 | 2025年5月7日 |
著者 | Soumya Kannan / Han Altae-Tran / Shiyou Zhu / Peiyu Xu / Daniel Strebinger / Rachel Oshiro / Guilhem Faure / Lukas Moeller / Julie Pham / Kepler S Mears / Heyuan M Ni / Rhiannon K Macrae / Feng Zhang / ![]() |
| PubMed 要旨 | Naturally existing enzymes have been adapted for a variety of molecular technologies, with enhancements or modifications to the enzymes introduced to improve the desired function; however, it is ...Naturally existing enzymes have been adapted for a variety of molecular technologies, with enhancements or modifications to the enzymes introduced to improve the desired function; however, it is difficult to engineer variants with enhanced activity while maintaining specificity. Here we engineer the compact Obligate Mobile Element Guided Activity (OMEGA) RNA-guided endonuclease IscB and its guiding RNA (ωRNA) by combining ortholog screening, structure-guided protein domain design and RNA engineering, and deep learning-based structure prediction to generate an improved variant, NovaIscB. We show that the compact NovaIscB achieves up to 40% indel activity (~100-fold improvement over wild-type OgeuIscB) on the human genome with improved specificity relative to existing IscBs. We further show that NovaIscB can be fused with a methyltransferase to create a programmable transcriptional repressor, OMEGAoff, that is compact enough to be packaged in a single adeno-associated virus vector for persistent in vivo gene repression. This study highlights the power of combining natural diversity with protein engineering to design enhanced enzymes for molecular biology applications. |
リンク | Nat Biotechnol / PubMed:40335752 |
| 手法 | EM (単粒子) |
| 解像度 | 2.71 Å |
| 構造データ | EMDB-49856, PDB-9nvu: |
| 化合物 | ![]() ChemComp-MG: ![]() ChemComp-ZN: |
| 由来 |
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キーワード | RNA BINDING PROTEIN/RNA/DNA / Gene editing / IscB / OMEGA / RNA-guided nuclease / RNA BINDING PROTEIN-RNA-DNA complex |
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