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Cryo-Electron Tomography

Chapter
Part of the Springer Handbooks book series (SHB)

Abstract

Classical structural biology approaches rely on highly purified molecules which are isolated from their neighbors far from the complex macromolecular interaction network of the cell (ex situ). We have seen breathtaking results of such isolated molecular structures at atomic or near-atomic resolution obtained by single-particle cryo-electron microscopy (cryo-EM). However, many supra- and macromolecular complexes involved in key cellular processes cannot be studied in isolation; their function is so deeply rooted in their cellular context that it is impossible to isolate them without compromising their structural integrity. The challenge now is to apply cryo-EM to protein complexes and other biological objects in their natural environment, namely cells. Cryo-electron tomography (cryo-ET) offers this opportunity, and in this chapter we provide an overview of recent advances in sample preparation, data acquisition and data processing, including technology for focused ion beam milling, correlative light and electron microscopy, phase-plate imaging and direct electron detection. We show that these developments can be used synergistically to generate 3-D images of cells of unprecedented quality, enabling direct visualization of macromolecular complexes and their spatial coordination in undisturbed eukaryotic cell environments (in situ).

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© Springer Nature Switzerland AG 2019

Authors and Affiliations

  1. 1.Dept. of Molecular Structural BiologyMax Planck Institute of BiochemistryMartinsriedGermany

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