 | Acta Crystallographica Section D Acta Crystallographica Section D BIOLOGICAL CRYSTALLOGRAPHY |
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![[Figure 1]](ba0051fig1mag.jpg)
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Figure 1
EM sample geometry. A variety of macromolecular assemblies, both ordered and as individual complexes, can be analysed by cryo-EM. Of the ordered assemblies, the 2D crystals are the ones which have yielded atomic resolution structures. However, they must be tilted to high angles to provide 3D data. The helical assemblies are only crystalline in one dimension and the varying orientation of the subunit around the helical axis is useful in providing a set of different views. No crystallization or naturally occurring order is necessary in the case of single particles (isolated complexes in solution), provided they are large enough to be detected and analysed. Single particles can range from highly symmetric, such as the icosahedral viruses, to asymmetric structures, such as the ribosome. |
![[Figure 1]](ba0051fig1.jpg)
| BIOLOGICAL CRYSTALLOGRAPHY |
ISSN: 1399-0047
