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Updated: Jun 2, 2025

Visualizing Proteins and Macromolecular Complexes by Negative Stain EM: from Grid Preparation to Image Acquisition
Published on: December 22, 2011
Negative Staining Electron Microscopy of a Highly Flexible Sec1/Munc18 Protein Complex Stabilized by Glutaraldehyde
Richard J Y Liu1, Walter H A Kahr2,3,4
1Departments of Paediatrics and Biochemistry, University of Toronto, Toronto, ON, Canada.
Abstract:
Negative staining electron microscopy is one of the easiest ways to determine the shape and dimensions of multimeric protein complexes over 100 kDa molecular weight. This method requires small volumes (< 10 μL) of dilute protein (0.01-0.1 mg/mL). Here we describe a method for quickly crosslinking a protein sample and preparing negative stained grids, and we also describe how to label a biotinylated protein subunit with avidin to determine its position within a complex using negative staining EM. This method should be generally applicable for most soluble protein complexes.
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