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-Structure paper
| タイトル | Complex water networks visualized by cryogenic electron microscopy of RNA. |
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| ジャーナル・号・ページ | Nature, Vol. 642, Issue 8066, Page 250-259, Year 2025 |
| 掲載日 | 2025年3月11日 |
著者 | Rachael C Kretsch / Shanshan Li / Grigore Pintilie / Michael Z Palo / David A Case / Rhiju Das / Kaiming Zhang / Wah Chiu / ![]() |
| PubMed 要旨 | The stability and function of biomolecules are directly influenced by their myriad interactions with water. Here we investigated water through cryogenic electron microscopy (cryo-EM) on a highly ...The stability and function of biomolecules are directly influenced by their myriad interactions with water. Here we investigated water through cryogenic electron microscopy (cryo-EM) on a highly solvated molecule: the Tetrahymena ribozyme. By using segmentation-guided water and ion modelling (SWIM), an approach combining resolvability and chemical parameters, we automatically modelled and cross-validated water molecules and Mg ions in the ribozyme core, revealing the extensive involvement of water in mediating RNA non-canonical interactions. Unexpectedly, in regions where SWIM does not model ordered water, we observed highly similar densities in both cryo-EM maps. In many of these regions, the cryo-EM densities superimpose with complex water networks predicted by molecular dynamics, supporting their assignment as water and suggesting a biophysical explanation for their elusiveness to conventional atomic coordinate modelling. Our study demonstrates an approach to unveil both rigid and flexible waters that surround biomolecules through cryo-EM map densities, statistical and chemical metrics, and molecular dynamics simulations. |
リンク | Nature / PubMed:40068818 / PubMed Central |
| 手法 | EM (単粒子) |
| 解像度 | 2.2 - 2.31 Å |
| 構造データ | EMDB-42498: Tetrahymena ribozyme with water and magnesium ions |
| 化合物 | ![]() ChemComp-MG: ![]() ChemComp-HOH: |
| 由来 |
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キーワード | RNA / Ribozyme / Magnesium ions / Water |
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