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Related Experiment Videos

Three-dimensional reconstructions from incomplete data: interpretability of density maps at "atomic" resolution.

R M Glaeser1, L Tong, S H Kim

  • 1Department of Biophysics and Medical Physics, Lawrence Berkeley Laboratory, University of California, Berkeley 94720.

Ultramicroscopy
|April 1, 1989
PubMed
Summary
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High-resolution electron microscopy can overcome missing cone data artifacts. Even with a +/- 30 degree missing cone, 3D protein density maps at 3.6A resolution remain interpretable and robust against noise.

Area of Science:

  • Structural Biology
  • Biophysics
  • Electron Microscopy

Background:

  • Three-dimensional data collection in electron microscopy is typically limited to tilt angles less than +/- 90 degrees.
  • This limitation results in a 'missing cone' of data in reciprocal space, potentially causing artifacts in 3D density maps.

Purpose of the Study:

  • To investigate the impact of a significant missing cone of data on high-resolution 3D electron microscopy density maps.
  • To determine if large missing cone angles affect map interpretability and noise sensitivity at high resolution.

Main Methods:

  • Numerical simulations were performed to assess the effects of missing cone data.
  • Three-dimensional density maps were calculated with and without a +/- 30 degree missing cone.
  • Noise sensitivity of the resulting maps was compared.

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Main Results:

  • A missing cone of +/- 30 degrees had no significant adverse effect on a 3.6A resolution protein density map.
  • The map generated with the missing cone was as robust to noise as the full Fourier map.
  • Less than 14% of the total data signal was lost due to the missing cone.

Conclusions:

  • High-resolution electron microscopy can tolerate substantial missing cone data, particularly when electron density features are well-resolved.
  • The interpretability and noise robustness of 3D density maps are maintained even with significant data gaps.
  • These findings suggest that high-resolution Fourier map interpretation is feasible within realistic experimental constraints of resolution and tilt angles.