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Filling the missing cone in protein electron crystallography
1Electron Diffraction Department, Hauptman-Woodward Medical Research Institute, Inc., Buffalo, New York 14203-1196, USA. dorset@hwi.buffalo.edu
Microscopy Research and Technique
|July 29, 1999
Summary
The Sayre equation can predict missing crystallographic phase data in electron microscopy, even with limited sample tilting. This technique aids in reconstructing lost information for improved protein structure analysis.
Area of Science:
- Electron Microscopy
- Crystallography
- Biophysics
Background:
- Electron microscopy (EM) often suffers from missing data in the Fourier space's
Purpose of the Study:
- To investigate the hyper-resolution capability of the Sayre equation for data extrapolation in EM.
Main Methods:
- Utilized the Sayre equation to extrapolate missing amplitude and phase data.
- Applied the method to a protein (rubredoxin) tilted to restricted angles in an electron microscope.
Main Results:
- Successfully predicted crystallographic phases at 0.6 nm resolution, reconstructing lost information.
- Optimal data restoration occurred with goniometer tilt angles greater than +/-60 degrees.
- Partial information recovery was achieved even with tilt angles restricted to +/-45 degrees.
Conclusions:
- The Sayre equation offers a viable method for addressing missing data in electron microscopy.
- The effectiveness of data extrapolation is dependent on the extent of goniometer tilting.