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Characterisation of molecular motions in cryo-EM single-particle data by multi-body refinement in RELION
Stockholm University, Faculty of Science, Department of Biochemistry and Biophysics. Stockholm University, Science for Life Laboratory (SciLifeLab).ORCID iD: 0000-0002-2662-6373
Stockholm University, Faculty of Science, Department of Biochemistry and Biophysics. Stockholm University, Science for Life Laboratory (SciLifeLab). KTH Royal Institute of Technology, Sweden.ORCID iD: 0000-0002-2734-2794
Number of Authors: 42018 (English)In: eLIFE, E-ISSN 2050-084X, Vol. 7, article id e36861Article in journal (Refereed) Published
Abstract [en]

Macromolecular complexes that exhibit continuous forms of structural flexibility pose a challenge for many existing tools in cryo-EM single-particle analysis. We describe a new tool, called multi-body refinement, which models flexible complexes as a user-defined number of rigid bodies that move independently from each other. Using separate focused refinements with iteratively improved partial signal subtraction, the new tool generates improved reconstructions for each of the defined bodies in a fully automated manner. Moreover, using principal component analysis on the relative orientations of the bodies over all particle images in the data set, we generate movies that describe the most important motions in the data. Our results on two test cases, a cytoplasmic ribosome from Plasmodium falciparum, and the spliceosomal B-complex from yeast, illustrate how multi-body refinement can be useful to gain unique insights into the structure and dynamics of large and flexible macromolecular complexes.

Place, publisher, year, edition, pages
2018. Vol. 7, article id e36861
National Category
Biological Sciences
Identifiers
URN: urn:nbn:se:su:diva-158144DOI: 10.7554/eLife.36861ISI: 000435436100001PubMedID: 29856314OAI: oai:DiVA.org:su-158144DiVA, id: diva2:1235351
Available from: 2018-07-25 Created: 2018-07-25 Last updated: 2018-07-25Bibliographically approved

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Nakane, TakanoriKimanius, DariLindahl, ErikScheres, Sjors H. W.
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