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-Structure paper
Title | Addressing compressive deformation of proteins embedded in crystalline ice. |
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Journal, issue, pages | Structure, Vol. 31, Issue 2, Page 213-220.e3, Year 2023 |
Publish date | Feb 2, 2023 |
Authors | Huigang Shi / Chunling Wu / Xinzheng Zhang / |
PubMed Abstract | For cryoelectron microscopy (cryo-EM), high cooling rates have been required for preparation of protein samples to vitrify the surrounding water and avoid formation of damaging crystalline ice. ...For cryoelectron microscopy (cryo-EM), high cooling rates have been required for preparation of protein samples to vitrify the surrounding water and avoid formation of damaging crystalline ice. Whether and how crystalline ice affects single-particle cryo-EM is still unclear. Here, single-particle cryo-EM was used to analyze three-dimensional structures of various proteins and viruses embedded in crystalline ice formed at various cooling rates. Low cooling rates led to shrinkage deformation and density distortions on samples having loose structures. Higher cooling rates reduced deformations. Deformation-free proteins in crystalline ice were obtained by modifying the freezing conditions, and reconstructions from these samples revealed a marked improvement over vitreous ice. This procedure also increased the efficiency of cryo-EM structure determinations and was essential for high-resolution reconstructions. |
External links | Structure / PubMed:36586403 |
Methods | EM (single particle) |
Resolution | 1.76 - 3.2 Å |
Structure data | EMDB-28627: Cryo-EM structure of Coxsackievirus A10 (empty) embedded in crystalline ice EMDB-28638: Cryo-EM structure of Coxsackievirus A10 embedded in crystalline ice EMDB-28639, PDB-8ew0: EMDB-28640, PDB-8ew2: EMDB-32695: High resolution of apo-ferritin embedded in crystalline ice EMDB-32703: apo-ferritin embedded in crystalline ice frozen at -183 degree EMDB-32709: EV71 VLP maps embedded in crystalline ice |
Source |
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Keywords | VIRUS / Coxsackievirus A10 / empty Coxsackievirus A10 / crystalline ice / LYASE / glutamate dehydrogenase / GDH / Aldolase / METAL BINDING PROTEIN / ferritin / crystal ice / crystal-ice / apo-ferritin / human apo-ferritin / human ferritin / Coxsackievirus |