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Updated: May 9, 2026

Single Particle Cryo-Electron Microscopy: From Sample to Structure

Single Particle Cryo-Electron Microscopy: From Sample to Structure

Published on: May 29, 2021

PRIME: probabilistic initial 3D model generation for single-particle cryo-electron microscopy.

Hans Elmlund¹, Dominika Elmlund, Samy Bengio

¹Department of Structural Biology, Stanford University Medical School, Fairchild Building, 1st Floor, 299 Campus Drive, Stanford, CA 94305-5126, USA. hael@stanford.edu

Structure (London, England : 1993)

|August 13, 2013

Summary

This summary is machine-generated.

Single-particle cryo-electron microscopy (cryo-EM) generates low signal-to-noise images. A new method, PRIME, creates accurate initial 3D maps from these noisy images without prior structural knowledge.

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Area of Science:

Structural biology
Biophysics
Microscopy

Background:

Single-particle cryo-electron microscopy (cryo-EM) images individual biomolecules at low doses to minimize radiation damage.
Low-dose imaging yields high-resolution structural data but results in images with a low signal-to-noise ratio.
Accurate three-dimensional (3D) reconstruction requires precise alignment of numerous noisy 2D projection images with unknown orientations.

Purpose of the Study:

To develop a novel method for generating accurate initial 3D models in single-particle cryo-EM.
To overcome the challenge of aligning noisy, low-signal images for high-resolution cryo-EM map reconstruction.

Main Methods:

Introduced PRIME, a novel computational method for single-particle cryo-EM data processing.
PRIME enables direct generation of an initial 3D map from noisy 2D projection images in a single step.
The method does not require prior structural information for initial model generation.

Main Results:

PRIME successfully generates an accurate initial 3D map directly from low signal-to-noise cryo-EM images.
The method facilitates precise 3D alignment, crucial for high-resolution map reconstruction (<10 Å).
Demonstrated the capability of PRIME to bypass the need for existing structural models.

Conclusions:

PRIME offers a significant advancement in single-particle cryo-EM by simplifying initial 3D model generation.
This method addresses a key bottleneck in achieving high-resolution structures from cryo-EM data.
PRIME has the potential to accelerate structural determination of large macromolecular assemblies.