Realizing the potential of electron cryo-microscopy

Area of Science:

• Structural biology
• Biophysics
• Biochemistry

Background:

• Recent advancements in electron microscopy have significantly improved the structural analysis of biological macromolecules.
• Vitreous ice embedding allows for high-resolution imaging of samples.
• Electron cryo-microscopy (cryo-EM) is a powerful technique for determining molecular structures.

Purpose of the Study:

• To review the progress and current capabilities of electron cryo-microscopy for structural analysis.
• To highlight the potential of cryo-EM for determining atomic models of biological macromolecules.
• To discuss the challenges associated with analyzing different sample types, particularly single particles.

Main Methods:

• Cryo-EM is used to analyze biological macromolecules embedded in vitreous ice.
• Structures are determined from two-dimensional crystals, helical arrays, or single particles.
• High-resolution data acquisition and image processing are key components.

Main Results:

• Cryo-EM can achieve resolutions adequate for atomic model building (4 Å) with crystalline and helical specimens.
• Significant progress has been made in applying cryo-EM to single particles.
• Different challenges exist for analyzing small and large single particles.

Conclusions:

• Electron cryo-microscopy is a rapidly advancing field with immense potential for structural biology.
• Achieving atomic resolution for single particles is a key future goal.
• Overcoming specific obstacles for small and large single particles will further enhance cryo-EM's utility.