Download MendeleyApplication of super-resolution and correlative double sampling in cryo-electron microscopy.
Sheng, Y., Harrison, P.J., Vogirala, V., Yang, Z., Strain-Damerell, C., Frosio, T., Himes, B.A., Siebert, C.A., Zhang, P., Clare, D.K.(2022) Faraday Discuss 240: 261-276
- PubMed: 35938521
- DOI: https://doi.org/10.1039/d2fd00049k
- Primary Citation of Related Structures:
7R5O - PubMed Abstract:
Developments in cryo-EM have allowed atomic or near-atomic resolution structure determination to become routine in single particle analysis (SPA). However, near-atomic resolution structures determined using cryo-electron tomography and sub-tomogram averaging (cryo-ET STA) are much less routine. In this paper, we show that collecting cryo-ET STA data using the same conditions as SPA, with both correlated double sampling (CDS) and the super-resolution mode, allowed apoferritin to be reconstructed out to the physical Nyquist frequency of the images. Even with just two tilt series, STA yields an apoferritin map at 2.9 Å resolution. These results highlight the exciting potential of cryo-ET STA in the future of protein structure determination. While processing SPA data recorded in super-resolution mode may yield structures surpassing the physical Nyquist limit, processing cryo-ET STA data in the super-resolution mode gave no additional resolution benefit. We further show that collecting SPA data in the super-resolution mode, with CDS activated, reduces the estimated B -factor, leading to a reduction in the number of particles required to reach a target resolution without compromising the data size on disk and the area imaged in SerialEM. However, collecting SPA data in CDS does reduce throughput, given that a similar resolution structure, with a slightly larger B -factor, is achievable with optimised parameters for speed in EPU (without CDS).
Organizational Affiliation:
Diamond Light Source, Harwell Science and Innovation Campus, Didcot, OX11 0DE, UK. daniel.clare@diamond.ac.uk.
