Micromachining tools and correlative approaches for cellular cryo-electron tomography
| Autor: | Tim Laugks, Jürgen M. Plitzko, Matthias Eibauer, Alexander Rigort, Felix J.B. Bäuerlein, Manuela Gruska, Wolfgang Baumeister, Andrew Leis, Helmut Gnaegi, Christian Hoffmann, Ulrike Böhm |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2010 |
| Předmět: |
Electron Microscope Tomography
Materials science Prions Mycobacterium smegmatis Nanotechnology Saccharomyces cerevisiae 02 engineering and technology Focused ion beam 03 medical and health sciences Structural Biology Microscopy Frozen Sections Dictyostelium Microscopy Phase-Contrast 030304 developmental biology 0303 health sciences Tomographic reconstruction Cryoelectron Microscopy 021001 nanoscience & nanotechnology Surface micromachining Microscopy Fluorescence Electron tomography Cryo-electron tomography Tomography 0210 nano-technology Biomedical engineering |
| Zdroj: | Journal of Structural Biology; Vol 172 Journal of Structural Biology |
| ISSN: | 1047-8477 |
| DOI: | 10.1016/j.jsb.2010.02.011 |
| Popis: | A principal limitation of cryo-transmission electron microscopy performed on cells or tissues is the accessible specimen thickness. This is exacerbated in tomography applications, where the aspect ratio (and thus the apparent specimen thickness) changes considerably during specimen tilting. Cryo-ultramicrotomy is the most obvious way of dealing with this problem; however, frozen-hydrated sections suffer from potentially inconsistent compression that cannot be corrected with certainty, and furthermore, yields of sections that satisfy all of the conditions necessary for tomographic imaging are poor. An alternative approach that avoids mechanical deformations is the use of focused ion beam (FIB) instrumentation, where thinning of the frozen-hydrated specimen occurs through the process of sputtering with heavy ions, typically gallium. Here, we use correlative cryo-fluorescence microscopy to navigate large cellular volumes and to localize specific cellular targets. We show that the selected targets in frozen-hydrated specimens can be accessed directly by focused ion beam milling. We also introduce a novel cryo-planing procedure as a method that could facilitate thinning of large areas of vitreous ice prior to cryo-fluorescence, FIB thinning, and cryo-electron tomography. |
| Databáze: | OpenAIRE |
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