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RELION-3: new tools for automated high-resolution cryo-EM structure determination

By Jasenko Zivanov, Takanori Nakane, BO Forsberg, Dari Kimanius, Wim J. H. Hagen, Erik Lindahl, Sjors Scheres

Posted 19 Sep 2018
bioRxiv DOI: 10.1101/421123 (published DOI: 10.7554/eLife.42166)

Here, we describe the third major release of RELION. CPU-based vector acceleration has been added in addition to GPU support, which provides flexibility in use of resources and avoids memory limitations. Reference-free autopicking with Laplacian-of-Gaussian filtering and execution of jobs from python allows non-interactive processing during acquisition, including 2D-classification, de novo model generation and 3D-classification. Per-particle refinement of CTF parameters and correction of estimated beam tilt provides higher-resolution reconstructions when particles are at different heights in the ice, and/or coma-free alignment has not been optimal. Ewald sphere curvature correction improves resolution for large particles. We illustrate these developments with publicly available data sets: together with a Bayesian approach to beam-induced motion correction it leads to resolution improvements of 0.2-0.7 Å compared to previous RELION versions.

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