Electron Cryo-microscopy of Molecular Machines
Molecular machine: A large complex made up of multiple copies of proteins and/or nucleic acids with a molecular size ranging from hundreds of kDa to tens of MDa. Examples of molecular machines are virus, ribosome, chaperonin, etc.
Electron cryo-microscopy (Cryo-EM): A structural method uses electron microscope to record images of frozen, hydrated specimens and uses computational procedures to reconstruct its three-dimensional density.
Single particle cryo-EM: A special application of cryo-EM where the specimen is a noncrystalline type embedded in a thin layer of vitreous ice as individual particles in random orientations.
Single-particle electron cryo-microscopy (cryo-EM) is an emerging structural biophysics technique for imaging individual molecular machines. Advantages of the cryo-EM imaging