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| Title | Accurate magnification determination for cryoEM using gold. |
|---|---|
| Journal, issue, pages | Ultramicroscopy, Vol. 256, Page 113883, Year 2024 |
| Publish date | Nov 15, 2023 |
 Authors | Joshua L Dickerson / Erin Leahy / Mathew J Peet / Katerina Naydenova / Christopher J Russo /  |
| PubMed Abstract | Determining the correct magnified pixel size of single-particle cryoEM micrographs is necessary to maximize resolution and enable accurate model building. Here we describe a simple and rapid ...Determining the correct magnified pixel size of single-particle cryoEM micrographs is necessary to maximize resolution and enable accurate model building. Here we describe a simple and rapid procedure for determining the absolute magnification in an electron cryomicroscope to a precision of <0.5%. We show how to use the atomic lattice spacings of crystals of thin and readily available test specimens, such as gold, as an absolute reference to determine magnification for both room temperature and cryogenic imaging. We compare this method to other commonly used methods, and show that it provides comparable accuracy in spite of its simplicity. This magnification calibration method provides a definitive reference quantity for data analysis and processing, simplifies the combination of multiple datasets from different microscopes and detectors, and improves the accuracy with which the contrast transfer function of the microscope can be determined. We also provide an open source program, magCalEM, which can be used to accurately estimate the magnified pixel size of a cryoEM dataset ex post facto. |
 External links | Ultramicroscopy / PubMed:38008055 / PubMed Central |
| Methods | EM (single particle) |
| Resolution | 1.5 - 1.8 Å |
| Structure data |  EMDB-17992: Structure of K27A mutant E.coli DPS  EMDB-17995: Cryo-EM structure of mouse heavy-chain apoferritin |
| Source |
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Escherichia coli (E. coli)
