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MethodsX. 2019 Mar 20;6:582-586. doi: 10.1016/j.mex.2019.02.032. eCollection 2019.

Suspending samples over carbon holey films increases heterogeneity of molecular orientations in negative stain electron microscopy.

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1
Duke Human Vaccine Institute, Duke University, Durham, NC, United States.

Abstract

Negative stain electron microscopy (NSEM) is a simple and cost effective method to analyze a wide variety of specimens, especially proteins. In traditional NSEM, the protein sample is applied to and supported by a continuous carbon film. Unfortunately, many proteins stick to the carbon film with a limited number of orientations. Because the restricted orientation limits the available views of the molecule, information about the three-dimensional structure of the molecule is likewise limited. The method presented here overcomes this limitation by using a carbon holey film combined with 1-octadecanol as a spreading agent. We demonstrate this method with solubilized envelope (Env) proteins from HIV, which typically show a restricted orientation on continuous carbon film, and show the following: •1-octadecanol added to negative stain aids the formation of a continuous sample-stain layer spanning the holes of a holey carbon film.•Samples negatively stained over holes show less restricted orientation, resulting in better single particle reconstructions.

KEYWORDS:

1-Octadecanol; Carbon film; Negative stain over holes; Preferred orientation; Single particle reconstructions; Uranyl formate

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