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Related Concept Videos

Cryo-electron Microscopy01:28

Cryo-electron Microscopy

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Conventional electron microscopy (EM) involves dehydration, fixation, and staining of biological samples, which distorts the native state of biological molecules and results in several artifacts. Also, the high-energy electron beam damages the sample and makes it difficult to obtain high-resolution images. These issues can be addressed using cryo-EM, which uses frozen samples and gentler electron beams. The technique was developed by Jacques Dubochet, Joachim Frank, and Richard Henderson, for...
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Miniaturized Sample Preparation for Transmission Electron Microscopy
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DM: a simple solution to suppress air-water interface interactions in cryo-EM.

Maria Rafiq1, Jan-Hannes Schäfer1, Hamidreza Rahmani1

  • 1Department of Integrative Computational and Structural Biology, Scripps Research Institute, La Jolla, CA, 92307.

Biorxiv : the Preprint Server for Biology
|April 10, 2026
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Summary

Adding n-decyl-β-D-maltopyranoside (DM) to samples before cryo-electron microscopy (cryo-EM) vitrification significantly reduces air-water interface artifacts. This method improves particle distribution and enhances high-resolution structure determination for various proteins.

Keywords:
cryo-EMpreferred orientationsingle-particle analysis

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Area of Science:

  • Structural Biology
  • Biochemistry
  • Biophysics

Background:

  • The air-water interface (AWI) presents a major challenge in cryo-electron microscopy (cryo-EM), causing protein adsorption, denaturation, and preferred particle orientations.
  • These AWI-induced artifacts hinder routine high-resolution structure determination of macromolecules.

Purpose of the Study:

  • To introduce a broadly applicable strategy to mitigate AWI-driven artifacts in cryo-EM sample preparation.
  • To evaluate the efficacy of n-decyl-β-D-maltopyranoside (DM) as an additive for improving cryo-EM data quality.

Main Methods:

  • A mild non-ionic detergent, n-decyl-β-D-maltopyranoside (DM), was added at low millimolar concentrations immediately prior to vitrification.
  • The impact of DM on particle distribution, structural integrity, and reconstruction quality was assessed across diverse macromolecular systems.

Main Results:

  • DM addition consistently suppressed AWI-driven artifacts, leading to improved angular sampling and reduced structural damage.
  • High-resolution reconstructions were achieved for challenging targets like Nucleophosmin 1 pentamer, hemagglutinin, and transthyretin.
  • DM prevented denaturation in aldolase and stabilized its C-terminus, demonstrating its protective effects.

Conclusions:

  • n-decyl-β-D-maltopyranoside (DM) effectively passivates deleterious air-water interface interactions without compromising particle integrity.
  • DM is a valuable additive for enhancing the robustness and quality of single-particle cryo-EM sample preparation.