Cryo Electron Microscopy of TRP Channels.

Cryo electron microscopy (cryo-EM) is a powerful technique that can be used to elucidate the structural architecture of a protein molecule in a physiologically relevant environment. In this method, purified protein is frozen in its aqueous buffer in a thin layer of vitreous ice in which the biological macromolecules are embedded in various orientations. Images of this frozen sample are collected with an electron microscope, and the data is processed using different software algorithms resulting in high-resolution structures of the protein. Proteins in the presence of various ligands or other macromolecular complexes can also be studied by this method. Here, we present a protocol for the purification and vitrification of TRP channels for single particle cryo-EM.