Journal
CURRENT OPINION IN STRUCTURAL BIOLOGY
Volume 15, Issue 5, Pages 571-577Publisher
CURRENT BIOLOGY LTD
DOI: 10.1016/j.sbi.2005.08.004
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Electron cryomicroscopy and single-particle reconstruction have advanced substantially over the past two decades. There are now numerous examples of structures that have been solved using this technique to better than 10 angstrom resolution. At such resolutions, direct identification of alpha helices is possible and, often, beta-sheet-containing regions can be identified. The most numerous subnanometer resolution structures are the icosahedral viruses, as higher resolution is easier to achieve with higher symmetry. Important non-icosahedral structures solved to subnanometer resolution include several ribosome structures, clathrin assemblies and, most recently, the Ca2+ release channel. There is now hope that, in the next few years, this technique will achieve resolutions approaching 4 angstrom, permitting a complete trace of the protein backbone without reference to a crystal structure.
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