Abstract
The past few decades have seen tremendous advances in single-particle electron cryo-microscopy (cryo-EM). The field has matured to the point that near-atomic resolution density maps can be generated for icosahedral viruses without the need for crystallization. In parallel, substantial progress has been made in determining the structures of nonicosahedrally arranged proteins in viruses by employing either single-particle cryo-EM or cryo-electron tomography (cryo-ET). Implicit in this course have been the availability of a new generation of electron cryo-microscopes and the development of the computational tools that are essential for generating these maps and models. This methodology has enabled structural biologists to analyze structures in increasing detail for virus particles that are in different morphogenetic states. Furthermore, electron imaging of frozen, hydrated cells, in the process of being infected by viruses, has also opened up a new avenue for studying virus structures “in situ”. Here we present the common techniques used to acquire and process cryo-EM and cryo-ET data and discuss their implications for structural virology both now and in the future.
Juan Chang, Xiangan Liu, Ryan H. Rochat and Matthew L. Baker contributed equally.
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Abbreviations
- 1-D:
-
One dimension; one dimensional
- 2-D:
-
Two dimensions; two dimensional
- 3-D:
-
Three dimensions; three dimensional
- CCD:
-
Charge-coupled device
- Cryo-EM:
-
Electron cryo-microscopy
- Cryo-ET:
-
Electron cryo-tomography
- CT:
-
Computed tomography
- CTF:
-
Contrast transfer function
- EM:
-
Electron microscope; electron microscopy
- EMDB:
-
Electron Microscopy Data Bank (http://www.emdatabank.org)
- FSC:
-
Fourier shell correlation
- FT:
-
Fourier transform
- GUI:
-
Graphical user interface
- SNR:
-
Signal-to-noise ratio
- SSE:
-
Secondary structural elements
- WPOA:
-
Weak phase object approximation
- ZPC:
-
Zernike phase contrast
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Acknowledgments
JC, XL, RHR and MLB contributed equally to this work. This work has been supported by grants from NIH (P41RR002250, R01AI0175208, and R01GM079429) and Robert Welch Foundation (Q1242). RHR is supported by the NIH training grants (GM07330 through the MSTP, T15LM007093 through the Gulf Coast Consortia). We thank Dr. Frazer Rixon for assistance with manuscript preparation.
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Chang, J., Liu, X., Rochat, R.H., Baker, M.L., Chiu, W. (2012). Reconstructing Virus Structures from Nanometer to Near-Atomic Resolutions with Cryo-Electron Microscopy and Tomography. In: Rossmann, M., Rao, V. (eds) Viral Molecular Machines. Advances in Experimental Medicine and Biology, vol 726. Springer, Boston, MA. https://doi.org/10.1007/978-1-4614-0980-9_4
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