Preservation and visualization of molecular structure in detergent‐extracted whole mounts of cultured cells
10.1002/jemt.1070220203
Crossref journal-article
Wiley
Microscopy Research and Technique (311)
Abstract

AbstractToday's electron microscopes have a resolution sufficient to resolve supramolecular structures. However, the methods used to prepare biological samples for electron microscopy often limit our ability to achieve the resolution that is theoretically possible. We use whole mounts of detergent‐extracted cells grown on Formvar‐coated gold grids as a model system to evaluate various steps in the preparation of biological samples for high resolution scanning electron microscopy (SEM)Factors that are important in determining the structure and composition of detergent‐extracted cells include the nature of the detergent and the composition of the extraction vehicle. Chelation of calcium is extremely important to stabilize and preserve the cytoskeletal filaments. We have also demonstrated both morphologically and by gel electrophoresis that treatment of cells with bifunctional protein crosslinkers before or during extraction with detergent can significantly enhance the preservation of both proteins and supramolecular structures.The methods used to dry samples are a major determinant of the quality of structural preservation. For cytoskeletons freeze‐drying (FD) is superior to critical point‐drying (CPD), one reason being that CPD samples have to be dehydrated, thereby causing more shrinkage as compared to FD samples. The high pressures to which samples are exposed during CPD may also cause increased shrinkage, and water contamination during CPD causes severe structural damage. We have obtained the best structural preservation of detergent‐extracted and fixed cells by manually plunging them into liquid propane and drying over night in a freeze‐drayer.The factor that most limits achievement of high resolution in SEM is the metal coat, which has to be very thin, uniform, and free of grain in order not to hide structures or to create artifactual ones. We have found that sputter‐coating with 1–3 nm of tungsten (W) or niobium )Nb( gives extremely fine‐grained films as well as satisfactory emission of secondary electrons. These samples can also be examined at high resolution by transmission electron microscopy (TEM) and scanning transmission electron microscopy (STEM). The best preservation and visualization of supramolecular structures have been obtained using cryosputtering, in which the samples are freeze‐dried and then sputter‐coated within the freeze‐dryer while still frozen. © 1992 Wiley‐Liss, Inc.

Bibliography

Lindroth, M., Bell, P. B., Fredriksson, B., & Liu, X. (1992). Preservation and visualization of molecular structure in detergent‐extracted whole mounts of cultured cells. Microscopy Research and Technique, 22(2), 130–150. Portico.

Authors 4
  1. Margaretha Lindroth (first)
  2. Paul B. Bell (additional)
  3. Bengt‐Arne Fredriksson (additional)
  4. Xiao‐Dong Liu (additional)
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Dates
Type When
Created 20 years, 6 months ago (Feb. 23, 2005, 5:43 p.m.)
Deposited 1 year, 10 months ago (Oct. 24, 2023, 1:23 p.m.)
Indexed 2 months, 2 weeks ago (June 9, 2025, 6:25 p.m.)
Issued 33 years, 1 month ago (July 1, 1992)
Published 33 years, 1 month ago (July 1, 1992)
Published Online 20 years, 6 months ago (Feb. 4, 2005)
Published Print 33 years, 1 month ago (July 1, 1992)
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@article{Lindroth_1992, title={Preservation and visualization of molecular structure in detergent‐extracted whole mounts of cultured cells}, volume={22}, ISSN={1097-0029}, url={http://dx.doi.org/10.1002/jemt.1070220203}, DOI={10.1002/jemt.1070220203}, number={2}, journal={Microscopy Research and Technique}, publisher={Wiley}, author={Lindroth, Margaretha and Bell, Paul B. and Fredriksson, Bengt‐Arne and Liu, Xiao‐Dong}, year={1992}, month=jul, pages={130–150} }