Programming Conventional Electron Microscopes for Solving Ultrahigh-Resolution Structures of Small and Macro-Molecules.Zhou, H., Luo, F., Luo, Z., Li, D., Liu, C., Li, X.
(2019) Anal Chem 91: 10996-11003
- PubMed: 31334636
- DOI: https://doi.org/10.1021/acs.analchem.9b01162
- Primary Citation of Related Structures:
6KJ1, 6KJ2, 6KJ3, 6KJ4
- PubMed Abstract:
Microcrystal electron diffraction (MicroED) is becoming a powerful tool in determining the crystal structures of biological macromolecules and small organic compounds. However, wide applications of this technique are still limited by the special requirement for radiation-tolerated movie-mode camera and the lack of automated data collection methods. Herein, we develop a stage-camera synchronization scheme to minimize the hardware requirements and enable the use of the conventional electron cryo-microscope with a single-frame CCD camera, which ensures not only the acquisition of ultrahigh-resolution diffraction data but also low cost in practice. This method renders the structure determination of both peptide and small organic compounds at ultrahigh resolution up to ∼0.60 Å with unambiguous assignment of nearly all hydrogen atoms. The present work provides a widely applicable solution for routine structure determination of MicroED and demonstrates the capability of the low-end 120 kV microscope with a CCD camera in solving ultrahigh resolution structures of both organic compounds and biological macromolecules.
Interdisciplinary Research Center on Biology and Chemistry, Shanghai Institute of Organic Chemistry , Chinese Academy of Sciences , Shanghai 201210 , China.