Sub-2 Å Ewald Curvature Corrected Single-Particle Cryo-EM
Yong Zi Tan,
Joshua A. Hull,
R. Jude Samulski,
Timothy S. Baker,
Posted 21 Apr 2018
bioRxiv DOI: 10.1101/305599 (published DOI: 10.1038/s41467-018-06076-6)
Posted 21 Apr 2018
Single-particle cryogenic electron microscopy (cryo-EM) provides a powerful methodology for structural biologists, but the resolutions typically attained with experimentally determined structures have lagged behind microscope capabilities. Here, we have exploited several technical solutions to improve resolution, including sub-Angstrom pixelation, per-particle CTF refinement, and most notably a correction for Ewald sphere curvature. The application of these methods on micrographs recorded on a base model Titan Krios enabled structure determination at ~1.86-Å resolution of an adeno-associated virus serotype 2 variant (AAV2), an important gene-delivery vehicle.
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