One of its main applications is to determine the 3D structure of proteins.
Sometimes you are not able to crystallize the proteins however, and the method cannot be used.
Crystallizing is not simple because:
Cryogenic electron microscopy can sometimes determine the structures of proteins that failed crystallization.
Often used as a synonym for X-ray crystallography, or to refer more specifically to the diffraction part of the experiment (exluding therefore sample preparation and data processing).
cyclotrons produce the better images, but they are expensive/you have to move to them and order a timeslot.
Lab-based just use some X-ray source from the lab, so it is much move convenient e.g. for a pharmaceutical company doing a bunch of images. The Wikipedia image shows such a self-contained lab system: en.wikipedia.org/wiki/File:Freezed_XRD.jpg
- 1958: myoglobin structure resolution (1958). The first protein to be resolved.
- 1965: lysozyme structure resolution (1965). The second protein to be resolved.
Crystallography determination with a transmission electron microscopy instead of the more classical X-ray crystallography.
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X-ray crystallography is a widely used technique for determining the atomic and molecular structure of a crystalline substance. The technique involves directing X-ray beams at a crystal and analyzing the pattern of X-rays that are diffracted by the crystal lattice. Here's a basic overview of the process: 1. **Crystal Formation**: The first step in X-ray crystallography is the growth of high-quality crystals of the substance being studied. These crystals must be of sufficient size and purity to provide clear diffraction patterns.