National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)
R35GM122579
米国
Howard Hughes Medical Institute (HHMI)
米国
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)
U24GM129541
米国
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)
R01GM079429
米国
Chinese Academy of Sciences
XDB0490000
中国
Other government
Center for Advanced Interdisciplinary Science and Biomedicine of IHM QYPY20220019
Other government
National Key R&D Program of China 2022YFC2303700
Other government
National Key R&D Program of China 2022YFA1302700
Other government
Fundamental Research Funds for the Central Universities WK9100000032
Other government
Fundamental Research Funds for the Central Universities WK9100000044
引用
ジャーナル: Nature / 年: 2025 タイトル: Complex water networks visualized by cryogenic electron microscopy of RNA. 著者: Rachael C Kretsch / Shanshan Li / Grigore Pintilie / Michael Z Palo / David A Case / Rhiju Das / Kaiming Zhang / Wah Chiu / 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.