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Grid batch-dependent tuning of glow discharge parameters.

Ramy Kazan1, Gabrielle Bourgeois1, Dominique Carisetti2

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Cryo-electron microscopy (cryo-EM) grid preparation issues were investigated using microscopy and spectroscopy. Optimizing glow discharge parameters resolved reconstruction variations linked to grid batches.

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continuous carboncryo-EMglow dischargequantifoilsample preparation

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Area of Science:

  • Structural Biology
  • Materials Science
  • Microscopy

Background:

  • Cryo-electron microscopy (cryo-EM) sample preparation is critical for high-resolution 3D reconstructions.
  • Inconsistent results, including particle aggregation and altered complex conformation, can arise from suboptimal grid preparation.
  • Variations in cryo-EM 3D reconstructions were observed to correlate with specific grid batches.

Purpose of the Study:

  • To investigate the causes of systematic variations in cryo-EM 3D reconstructions linked to grid batches.
  • To identify and characterize the physical and chemical properties of cryo-EM grids influencing sample preparation outcomes.
  • To establish methods for diagnosing and resolving grid preparation-related issues in cryo-EM.

Main Methods:

  • Transmission Electron Microscopy (TEM) and Scanning Electron Microscopy (SEM) for morphological analysis of grid surfaces.
  • Auger Electron Spectroscopy (AES) for elemental composition analysis of grid surfaces.
  • Infrared Interferometry for assessing surface properties and ice thickness.
  • Glow discharge optimization as a parameter adjustment.

Main Results:

  • TEM and SEM revealed morphological differences in grid batches.
  • AES indicated variations in surface elemental composition across different grid batches.
  • Infrared Interferometry provided insights into surface characteristics affecting ice formation.
  • Adjusting glow discharge parameters successfully mitigated reconstruction inconsistencies.

Conclusions:

  • Grid batch variations can significantly impact cryo-EM sample quality and reconstruction outcomes.
  • A multi-technique approach (TEM, SEM, AES, Infrared Interferometry) is effective for diagnosing grid preparation issues.
  • Optimized glow discharge treatment is crucial for achieving homogeneous ice and reliable particle distribution in cryo-EM.