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Related Experiment Video

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Expansion Microscopy: High-Resolution Fluorescent Imaging with a Conventional Microscope
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Programming Conventional Electron Microscopes for Solving Ultrahigh-Resolution Structures of Small and

Heng Zhou1,2, Feng Luo3,4, Zhipu Luo1,2

  • 1Key Laboratory of Protein Sciences ( Tsinghua University ), Ministry of Education, Beijing 100084 , China.

Analytical Chemistry
|July 24, 2019
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This study introduces a new method for Microcrystal Electron Diffraction (MicroED) using standard equipment. This approach enables ultrahigh-resolution structure determination of molecules, including hydrogen atoms, at lower costs.

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Area of Science:

  • Crystallography and Structural Biology
  • Materials Science
  • Organic Chemistry

Background:

  • Microcrystal Electron Diffraction (MicroED) is a powerful technique for determining crystal structures of biological macromolecules and small organic compounds.
  • Current limitations include specialized hardware requirements (radiation-tolerant cameras) and lack of automated data collection.
  • These limitations hinder the widespread application of MicroED.

Purpose of the Study:

  • To develop a cost-effective and widely applicable MicroED method.
  • To enable ultrahigh-resolution structure determination using conventional electron cryo-microscopes and single-frame CCD cameras.
  • To overcome hardware limitations and automate data collection.

Main Methods:

  • Development of a stage-camera synchronization scheme.
  • Utilizing conventional electron cryo-microscopes with single-frame CCD cameras.
  • Acquisition of ultrahigh-resolution diffraction data.

Main Results:

  • Achieved ultrahigh-resolution structure determination (up to ~0.60 Å) for peptides and small organic compounds.
  • Enabled unambiguous assignment of nearly all hydrogen atoms.
  • Demonstrated the capability of low-end 120 kV microscopes with CCD cameras for ultrahigh-resolution studies.

Conclusions:

  • The developed method provides a widely applicable solution for routine MicroED structure determination.
  • This approach significantly reduces hardware costs and accessibility barriers.
  • The technique is suitable for determining ultrahigh-resolution structures of both organic compounds and biological macromolecules.