Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
9138964 | Journal of Structural Biology | 2005 | 10 Pages |
Abstract
Electron cryotomography can be used to solve the three-dimensional structures of individual large macromolecules, assemblies, and even small intact cells to medium (â¼4-8 nm) resolution in a near-native state, but restrictions in the range of accessible views are a major limitation. Here we report on the design, characterization, and demonstration of a new “flip-flop” rotation stage that allows facile and routine collection of two orthogonal tilt-series of cryosamples. Single- and dual-axis tomograms of a variety of samples are compared to illustrate qualitatively the improvement produced by inclusion of the second tilt-series. Exact quantitative expressions are derived for the volume of the remaining “missing pyramid” in reciprocal space. When orthogonal tilt-series are recorded to ±65° in each direction, as this new cryostage permits, only 11% of reciprocal space is left unmeasured. The tomograms suggest that further improvement could be realized, however, through better software to align and merge dual-axis tilt-series of cryosamples.
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Authors
Cristina V. Iancu, Elizabeth R. Wright, Jordan Benjamin, William F. Tivol, D. Prabha Dias, Gavin E. Murphy, Robert C. Morrison, J. Bernard Heymann, Grant J. Jensen,