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-Structure paper
| タイトル | Base modifications reshape RNA folding landscapes and structure-function relationships in synthetic and natural RNAs. |
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| ジャーナル・号・ページ | Res Sq, Year 2025 |
| 掲載日 | 2025年5月29日 |
著者 | Ewan McRae / Deepak Yadav / Haoyun Yang / Sukyeong Lee / ![]() |
| PubMed 要旨 | Modified bases such as 5-methylcytosine (5mC) and N1-methyl-pseudouridine (N1Ψ) are widely used to reduce the immunogenicity of and enhance the stability and translational efficiency of therapeutic ...Modified bases such as 5-methylcytosine (5mC) and N1-methyl-pseudouridine (N1Ψ) are widely used to reduce the immunogenicity of and enhance the stability and translational efficiency of therapeutic RNAs, yet their effects on RNA 3D structure remain poorly understood. Here, we investigate how these base modifications influence the folding and function of structured RNAs using both an engineered RNA origami nanostructure and a naturally occurring ribozyme. We show that modified bases impair kinetic maturation of RNA nanostructures and promote alternative folding topologies via stabilization of noncanonical stacking arrangements. Cryo-EM and FRET experiments reveal that this conformational shift is driven not by changes in base pairing, but by altered stacking energetics at key junctions. Our findings highlight the need to consider structural consequences when using base modifications and offer design principles for the development of functional, structured RNAs in synthetic biology and therapeutic applications. |
リンク | Res Sq / PubMed:40502763 / PubMed Central |
| 手法 | EM (単粒子) |
| 解像度 | 4.9 - 12.1 Å |
| 構造データ | ![]() EMDB-70035: 5mC-6HBC-monomer RNA ![]() EMDB-70036: 5mC-6HBC-Type-1-dimer RNA ![]() EMDB-70037: 5mC-6HBC-TC-monomer RNA ![]() EMDB-70038: 5mC-TC-6HBC Type-2 dimer RNA ![]() EMDB-70039: N1Y-TC-6HBC type-1 dimer RNA ![]() EMDB-70040: N1Y-TC-6HBC type-2 dimer RNA ![]() EMDB-70041: 5mC Tetrahymena Ribozyme |
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Tetrahymena (真核生物)