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Cryo-electron Microscopy01:28

Cryo-electron Microscopy

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Conventional electron microscopy (EM) involves dehydration, fixation, and staining of biological samples, which distorts the native state of biological molecules and results in several artifacts. Also, the high-energy electron beam damages the sample and makes it difficult to obtain high-resolution images. These issues can be addressed using cryo-EM, which uses frozen samples and gentler electron beams. The technique was developed by Jacques Dubochet, Joachim Frank, and Richard Henderson, for...
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X-ray diffraction or XRD is an analytical tool that utilizes X-rays to study ordered structures such as crystalline organic and inorganic samples, polycrystalline materials, proteins, carbohydrates, and drugs.
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Cell Culture on Silicon Nitride Membranes and Cryopreparation for Synchrotron X-ray Fluorescence Nano-analysis
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Cryogenic x-ray diffraction microscopy utilizing high-pressure cryopreservation.

Enju Lima1, Yuriy Chushkin2, Peter van der Linden2

  • 1Photon Sciences, Brookhaven National Laboratory, Upton, NY, 11973 USA.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|November 7, 2014
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Summary
This summary is machine-generated.

High-pressure cryo-fixation enables cryo X-ray diffraction microscopy of bacteria. This technique overcomes ice scattering issues, improving image reconstruction for cellular environments.

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Area of Science:

  • Structural Biology
  • Microscopy Techniques
  • Biophysics

Background:

  • Cryo X-ray diffraction microscopy offers potential for high-resolution imaging of biological specimens.
  • Conventional cryo-fixation methods can introduce artifacts, particularly ice crystal formation.
  • Improving image reconstruction from frozen-hydrated samples is crucial for structural analysis.

Purpose of the Study:

  • To present cryo X-ray diffraction microscopy of high-pressure-cryofixed bacteria.
  • To achieve high-convergence imaging and multiple image reconstructions.
  • To investigate the impact of high-pressure cryo-fixation on image quality and phasing.

Main Methods:

  • Cryo X-ray diffraction microscopy was applied to hydrated Deinococcus radiodurans cells.
  • Cells were cryo-fixed at 200 MPa pressure within ~10-μm-thick water layers.
  • Phasing of diffraction patterns was used to image unstained, hydrated cellular environments.

Main Results:

  • Sub-30-nm resolution imaging was achieved using hard X-rays.
  • Comparisons were made with ambient-pressure-cryofixed samples.
  • A correlation was observed between background ice signal and phasing convergence.

Conclusions:

  • High-pressure cryo-fixation facilitates improved cryo X-ray diffraction microscopy.
  • Phasing difficulties in frozen-hydrated specimens may stem from high-background ice scattering.
  • This method enhances imaging of cellular environments at high resolution.