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TitlePushing the resolution limit by correcting the Ewald sphere effect in single-particle Cryo-EM reconstructions.
Journal, issue, pagesNat Commun, Vol. 9, Issue 1, Page 1552, Year 2018
Publish dateApr 19, 2018
AuthorsDongjie Zhu / Xiangxi Wang / Qianglin Fang / James L Van Etten / Michael G Rossmann / Zihe Rao / Xinzheng Zhang /
PubMed AbstractThe Ewald sphere effect is generally neglected when using the Central Projection Theorem for cryo electron microscopy single-particle reconstructions. This can reduce the resolution of a ...The Ewald sphere effect is generally neglected when using the Central Projection Theorem for cryo electron microscopy single-particle reconstructions. This can reduce the resolution of a reconstruction. Here we estimate the attainable resolution and report a "block-based" reconstruction method for extending the resolution limit. We find the Ewald sphere effect limits the resolution of large objects, especially large viruses. After processing two real datasets of large viruses, we show that our procedure can extend the resolution for both datasets and can accommodate the flexibility associated with large protein complexes.
External linksNat Commun / PubMed:29674632 / PubMed Central
MethodsEM (single particle)
Resolution3.5 Å
Structure data

EMDB-7626:
An asymmetric unit of the icosahedrally averaged outer capsid shell of PBCV-1
Method: EM (single particle) / Resolution: 3.5 Å

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