MicroED Sample Preparation and Data Collection For Protein Crystals.

Microcrystal Electron Diffraction (MicroED) enables structure determination of very small crystals that are much too small to be of use for other conventional diffraction techniques. MicroED has been used to determine the structures of many proteins and small organic molecules, and the technique can be performed on most standard cryo-TEM instruments equipped with high-speed detectors capable of collecting electron diffraction data. Here, we present protocols for MicroED sample preparation and data collection for protein microcrystals.