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• W3044028131 abstract "Cryo-electron microscopy (cryo-EM) has revolutionized structural biology by providing 3D density maps of biomolecules at near-atomic resolution. However, map validation is still an open issue. Despite several efforts from the community, it is possible to overfit 3D maps to noisy data. Here, we develop a novel methodology that uses a small independent particle set (not used during the 3D refinement) to validate the maps. The main idea is to monitor how the map probability evolves over the control set during the 3D refinement. The method is complementary to the gold-standard procedure, which generates two reconstructions at each iteration. We low-pass filter the two reconstructions for different frequency cutoffs, and we calculate the probability of each filtered map given the control set. For high-quality maps, the probability should increase as a function of the frequency cutoff and the refinement iteration. We also compute the similarity between the densities of probability distributions of the two reconstructions. As higher frequencies are included, the distributions become more dissimilar. We optimized the BioEM package to perform these calculations, and tested it over systems ranging from quality data to pure noise. Our results show that with our methodology, it possible to discriminate datasets that are constructed from noise particles. We conclude that validation against a control particle set provides a powerful tool to assess the quality of cryo-EM maps." @default.
• W3044028131 created "2020-07-29" @default.
• W3044028131 creator A5041094544 @default.
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• W3044028131 date "2020-01-01" @default.
• W3044028131 modified "2023-09-28" @default.
• W3044028131 title "Validation tests for cryo-EM maps using an independent particle set" @default.
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• W3044028131 doi "https://doi.org/10.1016/j.yjsbx.2020.100032" @default.
• W3044028131 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/7385033" @default.
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• W3044028131 hasPublicationYear "2020" @default.
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